AAT3672IWO-4.2-1-T1 - Skyworks Solutions, Inc.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Application

ADP ADP

CHRADP

BAT

AAT3672-1/-2

OUT

dapter Input

System Load

STAT2

Battery

Pack

ENO

ENBAT

STAT1

CADP

10μF

RSET RTERM

CBAT

10μF

Enable

Enable Input to Output

Enable Battery to Output

ADPSET

TERM

GND

CHR Threshold

Temp

BAT+

10kΩ

ADP

CHRADP

BAT

AAT3672-3

OUT

dapter Input

System Load

EN2

EN1

Battery

Pack

ENO

ENBAT

STAT1

CADP

10μF

RSET RTERM

CBAT

10μF

Enable 1

Enable 2

Enable Input to Output

Enable Battery to Output

ADPSET

TERM

GND

CHR Threshold

Temp

BAT+

ADP

10kΩ

General Description

The AAT3672 BatteryManager is a highly integrated sin-

gle-cell (4.2V) lithium-ion/polymer battery charger and

system power management IC that enables simultane-

ous battery charging and system load management.

The AAT3672 provides charging current and system

power management from a single input that may be sup-

plied by an AC adapter or USB port power source. This

device allows the user to program the battery charge

current up to 1.6A depending on the current shared with

the system output. A battery charge timeout timer is

provided for charging safety and the charge termination

current is also user-programmable.

The AAT3672 employs a battery charge current reduc-

tion function that enables continued system operation in

the event the input source can not supply the required

load current. When operated under excessive thermal

conditions, the AAT3672 has a digitally controlled ther-

mal loop which allows the maximum possible charging

current for any given ambient temperature condition.

Battery temperature, voltage and charge state are mon-

itored for fault conditions. The AAT3672-1/-2 has two

status monitor output pins (STAT1 and STAT2), and the

AAT3672-3 has one status monitor output (STAT1) pro-

vided to indicate battery charge status by directly driving

external LEDs.

The AAT3672 is available in a Pb-free, thermally

enhanced, space-saving 14-pin 3 × 3mm TDFN package.

Features

• System Load Power Control from Either ADP or

Battery

• ADP Presence Automatically Routes Power from

Source to Load and Charges Battery

• Automatic Charge Reduction Loop to Minimize

Charge Time

• Digitally Controlled Thermal Protection

• Battery Power Enable

• Programmable Battery Charge Timer

• Battery Cell Temperature Sensing

• Charge Status Reporting (LEDs)

• Automatic Recharge Sequencing

• Battery Over-Voltage, Over-Current, and

Over-Temperature Protection

• System Load Current Limiting

• 14-pin 3 × 3mm TDFN Package

Applications

• Cellular Phones

• Digital Still Cameras

• Digital Video Cameras

• Global Positioning Systems (GPS)

• MP3 Players

• Handheld PCs

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

2Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Pin Descriptions

Pin # Name Type Function

1 ADPSET I Connect a resistor from this pin to GND set the ADP fast charge constant current. The programmed

constant current level should be less than the ADP current limit set by ADPLIM speciﬁ cation (ILIM_ADP).

2 ADP I Adapter input, source of system load and battery charging. Connect a 1F (minimum) ceramic ca-

pacitor as close as possible between ADP and GND.

3STAT1 O

This open-drain MOSFET device is for charger status reporting. If used for status indication display,

connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or

ADP.

4 GND I/O Common ground connection.

STAT2 O

AAT3672-1/-2: This open-drain MOSFET device is for charger status reporting. If used for status

indication display, connect an LED cathode to this node with a series ballast resistor. Connect the LED

anode to OUT or ADP.

EN2 I AAT3672-3: The EN2 pin (internal pull-down) is used together with the EN1 pin; see Table 2 in the

"Functional Description" section of this datasheet.

EN I

AAT3672-1/-2: Input enable (internal pull-down). High to enable the ADP switch and battery charg-

ing path; low or ﬂ oating to disable the ADP switch and battery charging function. See Table 1 in the

"Functional Description" section of this datasheet.

EN1 I AAT3672-3: This EN1 pin (internal pull-down) is used together with the EN2 pin; see Table 2 in the

"Functional Description" section of this datasheet.

7 ENO I Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active

high input (internal pull down).

8 ENBAT I Battery load switch enable, active high. Battery load switch control the power path between the bat-

tery cell and OUT (internal pull down).

9 CHRADP I

Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction

threshold may be adjusted from the default value by placing a voltage divider between this pin to

VADP and GND to this pin.

10 TERM I Connect a resistor between this pin and GND to program the charge termination current threshold.

The charge termination current level can be disabled by connecting this pin to a logic high level.

11 TS I

Battery temperature sensing input. For typical applications, connect a 10k resistor from ADP to this

pin and a 10k NTC thermistor located inside the battery pack under charge to this pin and GND to

sense battery over temperature conditions during the charge cycle. To disable the TS function, con-

nect with a 10k resistor between this pin and GND.

12 BAT I/O Battery pack (+) connection. For best operation, a 1F (minimum) ceramic capacitor should be

placed as close as possible between BAT and GND.

13 OUT O

System dynamic power output supplied from the ADP input, BAT or both. Connect a 10F capacitor

between this pin and GND for best system stability. If the system load circuit contains a reasonable

bulk capacitance, the output capacitor value may be reduced.

14 CT I

Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typi-

cally, a 0.1F ceramic capacitor is connected between this pin and GND. To disable the timer circuit

function, connect this pin directly to GND.

EP EP I/O Exposed paddle (package bottom). Connect to GND as closely to the device as possible.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Pin Configuration

TDFN33-14

(Top View)

AAT3672-1/2 AAT3672-3

DPSET

ADP

STAT1

GND

STAT2

OUT

BAT

TERM

CHRADP

ENO 7

ENBAT

DPSET

ADP

STAT1

GND

EN2

EN1

OUT

BAT

TERM

CHRADP

ENO 7

ENBAT

Absolute Maximum Ratings

Symbol Description Value Units

VP ADP, BAT, OUT <30ms, Duty Cycle < 10% -0.3 to 7.5

EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2 -0.3 to 7.5

VNTS, CT, ADPSET, TERM, CHRADP -0.3 to VP + 0.3

TJJunction Temperature Range -40 to 150

°CTLEAD Maximum Soldering Temperature (at Leads) 300

TAOperating Temperature Range -25 to 85

Thermal Information1, 2

Symbol Description Value Units

JA Maximum Thermal Resistance 50 °C/W

JC Maximum Thermal Resistance 37

PDMaximum Power Dissipation 2.0 W

1. Mounted on 1.6mm thick FR4 circuit board.

2. Derate 50mW/°C above 25°C ambient temperature.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

4Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Electrical Characteristics1

VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Operation

VADP AC Adapter Operating Voltage Range 4.0 6.5

VBAT Battery Operating Voltage Range 3.0 VCO(REG)

VUVLO_ADP ADP Under-Voltage Lockout Rising Edge 3.4 3.9

Hysteresis 0.1

VUVLO_BAT BAT Under-Voltage Lockout Rising Edge 2.8 2.9 3.0

Hysteresis 0.1

IADP_OP ADP Normal Operating Current VADP = VEN = 5V, ICC = 1A 0.5 1 mA

IADP_SHDN1/2 ADP Shutdown Mode Current for AAT3672-1/-2 VADP = 5V, VEN = 0V, VENBAT = 0V,

No Load 1

A

IADP_SHDN3 ADP Shutdown Mode Current for AAT3673-3 VADP = VEN1 = VEN2 = 5V, VENO =

0V, VENBAT = 0V 5

IBAT_OP Battery Operating Current VBAT = VCO(REG), VADP = GND,

VUSB = GND, VENBAT = 5V, No Load 60 120

IBAT_SLP Battery Sleep Current VBAT = VCO(REG), VADP = 5V,

VEN = VENBAT = 5V 410

IBAT_SHDN Leakage Current from BAT Pin VBAT = VCO(REG), VENBAT = 0V 1

Power Switches

RDS(ON)_SWA ADP-to-OUT FET On Resistance VADP = 5.0V 600

m RDS(ON)_SWB BAT-to-OUT FET On Resistance VBAT = 4.1V 80

RDS(ON)_CHA ADP Battery Charging FET On Resistance VADP = 5.0V 600

Battery Charge Voltage Regulation

VCO(REG) Output Charge Voltage Regulation 4.158 4.20 4.242

VMIN Preconditioning Voltage Threshold 2.8 2.9 3.0

VRCH Battery Recharge Voltage Threshold VCO(REG)

- 0.17

VCO(REG)

- 0.1

VCO(REG)

- 0.05

VCHR_TH Default ADP Charge Reduction Threshold

CHRADP Open; Reduce Charge

Current When ADP is Below

VCHR_TH

4.5

VCHR_REG CHRADP and CHRUSB Pin Voltage Accuracy 1.9 2.0 2.1

Current Regulation

ILIM_ADP ADP Current Limit (Fixed) 1.6

ILIM_BAT BAT_OUT Current Limit (Fixed) 2.3

ICH_CC_ADP ADP Charge Constant Current Charge Range 100 1600 mA

ICH_CC/

ICH_CC

Constant Current Charge Current

Regulation Tolerance ICH_CC_ADP = 1A -12 12 %

ICH_TKL_ADP ADP Charge Trickle Charge 10 %

ICH_CC_ADP

VADPSET ADPSET Pin Voltage Regulation 2 V

VTERM TERM Pin Voltage Regulation 2

KI_CC_ADP Constant Current Charge Current Set

Factor: ICH_CC_ADP/IADPSET 29300

KI_TERM Termination Current Set Factor:

ICH_TERM/ITERM 2000

AAT3672-3 Only

ICH_LO USB Low Level Charge Current (Fixed) VEN1 = VEN2 = 0 70 85 100 mA

ICH_HI USB High Level Charge Current (Fixed) VEN1 = 0; VEN2 = 5V 400 450 500

1. The AAT3672 is guaranteed to meet performance specifications over the -25°C to +85°C operating temperature range and is assured by design, characterization, and correla-

tion with statistical process controls.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Electrical Characteristics (continued)1

VADP = 5V, TA = -25°C to +85°C; unless otherwise noted, typical values are TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Logic Control/Protection

VEN Input High Threshold 1.6

V VEN Input Low Threshold 0.4

VSTATx Output Low Voltage STATx Pin Sinks 8mA 0.4

TC Fast Charge (Trickle Charge + Constant Current +

Constant Voltage Charges Together) Timeout CCT = 0.1F 7 hour

TTKL Trickle Charge Timeout TC/8

VBOVP Battery Over-Voltage Protection Threshold VCO(REG)

+ 0.1

VCO(REG)

+ 0.15

VCO(REG)

+ 0.2 V

IOCP Battery Charge Over-Current Protection Threshold In All Modes 100 %

ICH_CC

TS1 High Temperature Threshold 28 30 32 % VADP

TS2 Low Temperature Threshold 58 60 62 % VADP

TLOOP_IN Digital Thermal Loop Entry Threshold 115

ºC

TLOOP_OUT Digital Thermal Loop Exit Threshold 95

TLOOP_REG Digital Thermal Loop Regulated Temperature 100

TSHDN Chip Thermal Shutdown Temperature Threshold 140

Hysteresis 15

1. The AAT3672 is guaranteed to meet performance specifications over the -25°C to +85°C operating temperature range and is assured by design, characterization, and correla-

tion with statistical process controls.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

6Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Adapter Supply Operating Current vs. RSET

RSET (kΩ)

Operating Current IADP_OP (mA)

10 100 1000 10000

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

Constant Current

Pre-Conditioning

Constant Charge Current vs. RADP

RADP (kΩ)

Constant Charge Current (mA)

10 100 1000 10000

100

1000

10000

Constant Current

Pre-Conditioning

Output Charge Voltage Regulation

Accuracy vs. Adapter Voltage

(VCO(REG) = 4.2V)

VADP (V)

Accuracy (%)

5 5.25 5.5 5.75 6 6.25 6.5

-0.25

-0.2

-0.15

-0.1

-0.05

0.05

0.1

0.15

0.2

0.25

Output Charge Voltage vs. Temperature

Temperature (°

Battery Voltage (V)

-25 -5 15 35 55 75-15 5 25 45 65 85

4.17

4.18

4.19

4.2

4.21

4.22

4.23

Battery Sleep Current vs. Temperature

Temperature (°

Battery Sleep Current (μA)

2.5

3.5

4.5

-25 -5 15 35 55 75-15 5 25 45 65 85

Operating Current vs. Temperature

Temperature (°

IOP (mA)

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

-25 -5 15 35 55 75-15 5 25 45 65 85

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Constant Charging Current

vs. Adapter Voltage

VADP (V)

Constant Charging Current (A)

4 4.5 5 5.5 6 6.5

0.7

0.75

0.8

0.85

0.9

0.95

1.05

1.1

VBAT = 3.6V

VBAT = 3.9V

VBAT = 4.1V

Recharge Voltage Threshold vs. Temperature

(VADP = 5V; RSET = 56.7kΩ)

Temperature (°

Battery Voltage (V)

4.04

4.06

4.08

4.1

4.12

4.14

4.16

-25 -5 15 35 55 75-15 5 25 45 65 85

Constant Charge Current vs. Temperature

Temperature (°

Constant Charge Current (mA)

100

200

300

400

500

600

700

800

900

1000

1100

-25 -5 15 35 55 75-15 5 25 45 65 85

425mA

85mA

Constant Charge Current vs. Battery Voltage

Battery Voltage (V)

Chargin Current (mA)

2.5 2.9 3.3 3.7 4.1 4.5

200

400

600

800

1000

1200 1A

425mA

85mA

Preconditioning Voltage Threshold

vs. Adapter Voltage

VADP (V)

VMIN (V)

5 5.25 5.5 5.75 6 6.25 6.5

2.8

2.82

2.84

2.86

2.88

2.9

2.92

2.94

2.96

2.98

Preconditioning Voltage Threshold

vs. Temperature

Temperature (°

VMIN (V)

2.8

2.82

2.84

2.86

2.88

2.9

2.92

2.94

2.96

2.98

-25 -5 15 35 55 75-15 5 25 45 65 85

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

8Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Adapter and Charging Current

vs. Output Current

(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V)

Output Current (A)

Adapter Current (A)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

IADP

IBAT

Adapter and Charging Current vs. Output Current

(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;

AAT3672-3 VEN1 = VEN2 = 0V)

Output Current (A)

Adapter Current (A)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

IADP

IBAT

Adapter and Charging Current vs. Output Current

(VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V;

AAT3672-3 VEN1 = 0V; VEN2 = 5V)

Output Current (A)

Current (A)

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

IADP

IBAT

CT Pin Capacitance vs. Counter Timeout

Time (hours)

Capacitance (μF)

0123 4567

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Full Charge

Trickle Charge

ADP Charge Current

(1A Charging Setting)

Time

ADP Voltage

(top) (V)

ADP Charge Current (middle)

ADP Peripheral Current (bottom)

(0.5A/div)

4.5

ADP Charge Current

(500mA Charging Setting)

Time

ADP Voltage

(top) (V)

ADP Charge Current (middle)

ADP Peripheral Current (bottom)

(0.5A/div)

500mA

4.5

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Response of Out when Switching from VBAT to VADP

(VADP = 0V→ 5V; VBAT = 3.6V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when Switching from VADP to VBAT

(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 5V; VENO = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when Switching from VBAT to VADP

(VADP = 0V→ 5V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when Switching from VADP to VBAT

(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when VENO = 0V

(VADP = 0V→ 5V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when VENO = 0V

(VADP = 5V→ 0V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

Response of Out when VENBAT = 0V

(VBAT = 0V→ 3.6V; VADP = 5V; VENO = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when VENBAT = 0V

(VBAT = 3.6V→ 0V; VADP = 5V; VENO = 5V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when Inserting Battery

(VBAT = 0V→ 3.6V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Response of Out when Removing Battery

(VBAT = 3.6V→ 0V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50Ω)

Time (200μs/div)

VADP, VBAT, VOUT Voltage (V)

-1

VADP

VBAT

VOUT

Input High Threshold vs. Adapter Voltage

VADP (V)

VENBAT(H); VEN1(H); VEN2(H); VENO(H) (V)

5 5.25 5.5 5.75 6 6.25 6.5

0.4

0.6

0.8

1.2

1.4

1.6

-25°C

25°C

85°C

Input Low Threshold vs. Adapter Voltage

VADP (V)

VENBAT(L); VEN1(L); VEN2(L); VENO(L) (V)

5 5.25 5.5 5.75 6 6.25 6.5

0.4

0.6

0.8

1.2

1.4

1.6

-25°C

25°C

85°C

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Typical Characteristics

High Temperature Threshold

(VADP = 5V)

Temperature (°

High Temperature

Threshold, TS1 (%)

28.5

29.5

30.5

31.5

-25 -5 15 35 55 75-15 5 25 45 65 85

Low Temperature Threshold

(VADP = 5V)

Temperature (°

Low Temperature

Threshold, TS2 (%)

58.5

59.5

60.5

61.5

-25 -5 15 35 55 75-15 5 25 45 65 85

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Functional Block Diagram

Charge

System

Control

Thermal and

Current Sense

Ref.

Voltage

Sense

ENO

BAT

OUT

ADP to BAT

Switch

CHRADP

GND

ADP

ADPSET

EN/EN1

ADP to OUT Switch

BAT to OUT

Switch

STAT1

STAT2/EN2

TERM

ENBAT

Functional Description

The AAT3672 is a single input dynamic battery charger

and power control IC. The input power control is designed

to be compatible with either AC power adapter or USB

port power sources. In addition, this device also provides

dynamic power control to charge a single cell Li-ion bat-

tery and power a system load simultaneously.

The device contains three pass devices to control the

charge current or voltage from the adapter input power

to the battery and system load. It also contains an addi-

tional load switch to control and manage power from the

battery to the system load. This charge control and

switch array permits dynamic charging of the battery cell

and control of power to the system load simultaneously.

When an input power source is applied to the AAT3672,

the adapter input will provide power to the system load

and charge the battery. Without a valid supply present

on the ADP pin, the battery will power the system load

as long as the battery voltage is greater than 2.9V. The

internal battery voltage sense circuit will disconnect the

battery from the load if the cell voltage falls below 2.9V

to protect the battery cell from over-discharge which

results in shorter battery life.

The system load current drawn from the battery is lim-

ited internally. The AAT3672 precisely regulates battery

charge current and voltage for 4.2V Li-ion battery cells.

The battery charge current can be programmed up to

1.6A. During battery charge, the AAT3672 pre-conditions

(trickle charge) the battery with a lower current when

the battery voltage is less than 2.9V, the system then

charges the battery in a constant current fast charge

mode when the battery voltage is above 2.9V. When the

battery voltage rises to 4.2V, the charger will automati-

cally switch to a constant voltage mode until the charge

current is reduced to the programmed charge termina-

tion current threshold.

The internal arrangement of load switches and the charge

regulation device provide dynamic power sourcing to the

system load. If the system load exceeds the input current

supply from the input source, additional current can be

supplied from the battery cell. At all times, the device will

manage distribution of power between the source, the

battery and the system simultaneously in order to support

system power needs and charge the battery cell with the

maximum amount of current possible. The AAT3672 has

a unique internal charge current reduction loop control

that will prevent an input source from overload. In the

AAT3672

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case of USB charging from a USB port VUSB supply, there

are two events which need to be guarded against. The

first is charging from a defective or inadequate USB host

supply; the second problem could arise if the programmed

charge current plus the system supply demand through

the AAT3672 exceeds the ability of a given USB port. In

either case, the AAT3672 charge reduction (CHR) loop will

activate when the input source drops below the VCHR_TH

threshold of 4.5V. The CHR loop will automatically reduce

the charge current to the battery until the supply voltage

recovers to a point above the VCHR_TH threshold. This

unique feature protects the charger, system and source

supply in the event an adapter or power source does not

meet the programmed ADP charging mode current

demand. The resulting CHR system will permit the charg-

ing of a battery cell with the maximum possible amount

of charge current for any given source fault condition.

During battery charging, the device temperature can

rise due to power dissipation within the charge current

control device and the load switches. In some cases, the

power dissipation in the device may cause the junction

temperature to rise up to its thermal shutdown thresh-

old. In the event of an internal over-temperature condi-

tion caused by excessive ambient operating temperature

or an excessive power dissipation condition, the AAT3672

utilizes a digitally controlled thermal loop system that

will reduce the charging current to prevent the device

from thermal shutdown. The digital thermal loop will

maintain the maximum possible battery charging cur-

rent for the given set of input to output power dissipa-

tion and ambient temperature conditions.

The digital thermal loop control is dynamic in the sense

that it will continue to adjust the battery charging cur-

rent as operating conditions change. The digital thermal

loop will reset and resume normal operation when the

power dissipation or over temperature conditions are

removed.

Battery temperature and charge state are fully monitored

for fault conditions. In the event of an over voltage, over-

current, or over-temperature failure, the device will auto-

matically shut down, thus protecting the charging device,

control system, and the battery under charge. In addition

to internal charge controller thermal protection, the

AAT3672 also provides a temperature sense feedback

function (TS pin) from the battery to shut down the

device in the event the battery exceeds its own thermal

limit during charging. All fault events are reported to the

user by the simple status LED(s) which is (are) internally

controlled by open drain NMOS switch(es).

Charging Operation

The AAT3672 has four basic modes for the battery

charge cycle: pre-conditioning/trickle charge, constant

current fast charge, constant voltage, and end of charge/

sleep state.

Battery Preconditioning

Before the start of charging, the AAT3672 checks several

conditions in order to assure a safe charging environ-

ment. The input supply must be above the minimum

operating voltage, or under-voltage lockout threshold

(VUVLO), for the charging sequence to begin. Also, the cell

temperature, as reported by a thermistor connected to

the TS pin from the battery, must be within the proper

window for safe charging. When these conditions have

been met and a battery is connected to the BAT pin, the

AAT3672 checks the state of the battery by sensing the

cell voltage. If the cell voltage is below the precondition-

ing voltage threshold (VMIN), the AAT3672 begins precon-

ditioning the battery cell.

Fast Charge/Constant Current Charging

Battery cell preconditioning continues until the voltage

measured by the internal sense circuit exceeds the pre-

conditioning voltage threshold (VMIN). At this point, the

AAT3672 begins the fast charge constant current phase.

The fast charge constant current (ICH_CC) level is pro-

grammed by the user via the RSET resistor. The AAT3672

remains in constant current charge mode until the bat-

tery reaches the voltage regulation point, VCO(REG). The

formula for fast charge current as a function of current

setting resistor is:

CH_CC

= K

I_CC_ADP

· 2V

SET

Alternately, to select the resistor value for a given charg-

ing current use:

SET

= K

I_CC_ADP

· 2V

CH_CC

where KI_CC_ADP = 29300 (typical).

AAT3672

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Constant Voltage Charging

The charge control system transitions to a regulated con-

stant voltage phase from the constant current fast charge

mode when the battery voltage reaches the end of charge

regulation threshold (VCO(REG)). The regulation voltage

level is factory programmed to 4.2V (±1%). The charge

current in the constant voltage mode drops as the bat-

tery cell under charge reaches its maximum capacity.

End of Charge Cycle Termination

and Recharge Sequence

When the charge current drops to the user programmed

charge termination current at the end of the constant

voltage charging phase, the device terminates charging,

enables the recharge control circuit and enters the sleep

state. The charger will remain in the sleep state until the

battery voltage decreases to a level below the battery

recharge voltage threshold (VRCH). The charge termina-

tion current is programmed via the RTERM resistor which

is connected between the TERM pin and ground. Use the

values listed in Table 3 to set the desired charge termi-

nation current. The programmed charge termination

current will remain at the same set level regardless of

which fast charge ADP, USBH or USBL constant current

mode is selected.

If the desired end of charge termination current level is

not listed in Table 3, the TERM resistor value may be

calculated by the following equation:

ICH_TERM = KI_TERM · 2V

RTERM

RTERM = KI_TERM · 2V

ICH_TERM

KI_TERM = 2000 (typical).

Control Inputs Pass Devices

EN ENO ENBAT ADP - OUT ADP - BAT BAT - OUT

0 0 0 OFF OFF OFF

1 0 0 OFF ON OFF

0 1 0 OFF OFF OFF

1 1 0 ON ON OFF

0 0 1 OFF OFF ON

1 0 1 OFF ON ON

0 1 1 OFF OFF ON

1 1 1 ON ON ON

Table 1: AAT3672-1 and AAT3672-2 Battery and Adapter Dynamic Path Control Table.

Control Inputs Pass Devices

EN1 EN2 ENO ENBAT ADP-OUT ADP-BAT BAT-OUT

1100OFFOFFOFF

0000OFFONOFF

0100OFFONOFF

1000OFFONOFF

1110OFFOFFOFF

0010ONONOFF

0110ONONOFF

1010ONONOFF

1101OFFOFFON

0001OFFONON

0101OFFONON

1001OFFONON

1111OFFOFFON

0011ONONON

0111ONONON

1011ONONON

Table 2: AAT3672-3 Battery and Adapter Dynamic Path Control Table.

AAT3672

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ICH_CC

Recharge Phase

ICH_ TKL

VUVLO

VMIN

VCO( REG)

VRCH

ICH_ TERM

when

VBAT =

VCO( REG)

ICH_ TERM

when

VBAT =

VCO( REG)

Constant Voltage

Charge Phase Charge Phase (CV)

Constant Current

Charge Phase (CC)

Trickle

ChargeUVLO

Battery Constant VoltageConstant Current

Charge Phase

Termination

Phase

Termination

Phase

ICH_ CC

Figure 1: Current vs. Voltage and Charger Time Profile.

ITERM (mA) RTERM (k)

320 11.0

174 21.0

125 30.9

95 41.2

77 51.1

64 61.9

58 71.5

50 80.6

49 90.9

42 100.0

37 110.0

Table 3: Charge Termination Current

Programming Resistor Values.

When the input supply is disconnected, the charger also

automatically enters power-saving sleep mode.

Consuming less than 1A in sleep mode, the AAT3672

minimizes battery drain when not charging. This feature

is particularly useful in applications where the input sup-

ply level may fall below the usable range of the charge

reduction control or under-voltage lockout level. In such

cases where the AAT3672 input voltage drops, the

device will enter the sleep mode and automatically

resume charging once the input supply has recovered

from its fault condition.

When the input supply is disconnected, the charger also

automatically enters power-saving sleep mode. Only

consuming less than 1A in sleep mode, the AAT3672

minimizes battery drain when not charging. This feature

is particularly useful in applications where the input sup-

ply level may fall below the usable range of the charge

reduction control or under-voltage lockout level. In such

cases where the AAT3672 input voltage drops, the

device will enter the sleep mode and automatically

resume charging once the input supply has recovered

from its fault condition.

Dynamic Current Regulation

There are two possible configurations where the system

load current and charge current are dynamically con-

trolled. In the first case, the ADP-BAT switch and the

BAT-OUT switch are enabled, and the ADP-OUT switch

is disabled. Under this condition, the adapter input cur-

rent is set by the RSET resistor (fast charge current set-

ting, ICH_CC) and is split between the system load (IBAT-

OUT) and the battery charge current (IBAT). The charge

current is dynamically adjusted as the system load

AAT3672

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varies in order to maintain the adapter input current.

ICH_CC = IBAT + IBAT-OUT

For example: If RSET = 57.6k, the fast charge current

is set for 1A. For a system load of 0mA, the battery

charge current is 1A. As the system load is increased

the battery charge current is reduced, until the system

load is equal to 1A and the battery charge current is 0A.

Further increases in the system load will result in the

battery supplying the balance of the current; a system

load of 1.2A requires the battery to supply 0.2A.

In the second case, the ADP-BAT switch, the BAT-OUT

switch and the ADP-OUT switch are all enabled. Under

this condition, the adapter input current is limited inter-

nally to 1.6A minimum (ILIM_ADP) and is split between the

system load (IADP-OUT) and the battery charge current

(ICH_CC). The charge current is dynamically adjusted as

the system load varies in order to maintain the adapter

input current at or below the 1.6A minimum.

ILIM_ADP ≥ ICH_CC + IADP-OUT

For example: If RSET = 57.6k, the fast charge current

is set for 1A. For a system load of 0mA, the battery

charge current is 1A and the adapter current is less than

1.6A. As the system load is increased the battery charge

current is 1A, until the system load is equal to 0.6A and

the adapter input current is 1.6A. Increasing the system

load above 0.6A causes the battery charge current to be

reduced, until the system load is equal to 1.6A and the

battery charge current is 0A. Further increases in the

system load will result in the battery supplying the bal-

ance of the current; a system load of 1.8A requires the

battery to supply 0.2A.

Temperature Sense (TS)

Inside the AAT3672, the internal battery temperature

sensing system is comprised of two comparators which

establish a voltage window for safe operation. The thresh-

olds for the TS operating window are bounded by the TS1

and TS2 specifications. Referring to the electrical charac-

teristics table in this datasheet, the TS1 threshold = 0.30

· VADP and the TS2 threshold = 0.60 · VADP

. If the use of

the TS pin function is not required by the system, it

should be terminated to ground using a 10k resistor.

0.60 x VADP

x VADP

VADP

Battery Cold Fault

Battery Hot Fault

ADP

AAT3672

Battery

Pack

Figure 2: AAT3672 Battery Temperature

Sense Circuit.

Charge Safety Timer (CT)

While monitoring the charge cycle, the AAT3672 utilizes

a charge safety timer to help identify damaged cells and

to ensure that the cell is charged safely. Operation is as

follows: upon initiating a charging cycle, the AAT3672

charges the cell at 10% of the programmed maximum

charge until VBAT >2.9V. If the cell voltage fails to the

precondition threshold of 2.9V (typ) before the safety

timer expires, the cell is assumed to be damaged and

the charge cycle terminates. If the cell voltage exceeds

2.9V prior to the expiration of the timer, the charge cycle

proceeds into fast charge. There are two timeout peri-

ods: about 50 minutes for Trickle Charge mode, 6 hours

for Constant Current (CC) mode and Constant Voltage

(CV) mode altogether.

The timeout is 7 hours (typical) for a CT = 100nF capac-

itor. Timeout is directly proportional to capacitor value,

so for a 200nF capacitor it would be 14 hours, and for a

50nF capacitor it would be 3.5 hours.

For a given target delay time TD (in hours) calculate:

CT = (TD · 100nF)

The CT pin is driven by a constant current source and

provides a linear response to increases in the timing

capacitor value.

If the programmable watchdog timer function is not

needed, it can be disabled by terminating the CT pin to

ground. The CT pin should not be left floating or unter-

minated, as this will cause errors in the internal timing

AAT3672

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control circuit. The constant current provided to charge

the timing capacitor is very small, and this pin is suscep-

tible to noise and changes in capacitance value.

Therefore, the timing capacitor should be physically

located on the printed circuit board layout as close as

possible to the CT pin. Since the accuracy of the internal

timer is dominated by the capacitance value, a 10% tol-

erance or better ceramic capacitor is recommended.

Ceramic capacitor materials, such as X7R and X5R

types, are a good choice for this application.

System Operation Flowchart

Switch

UVLO

VADP > VUVLO

Power On

Reset

Fault Condition

Monitor

OV, OT, OC

Battery

Temperature Sense

TS1

< TS < V

TS2

Preconditioning

Test

VMIN > VBAT

Current

Phase Test

VCO(REG) > VBAT

Voltage

Phase Test

IBAT > ITERM

Charge

Complete

Recharge Test

VRCH > VBAT?

Sleep

Mode

Thermal

Loop Enable

Thermal Loop

Current Reduction

Device

Temperature

Monitor

TJ > 110°C

Input Voltage

Level Test

VADP < VCHR_TH

Constant Current

Charging Mode

Constant Voltage

Charge Mode

Voltage

Regulation

Enable

Low Current

Conditioning

Charge

Battery

Temperature

Fault

Shutdown

Mode

Charge Timer

(Enable on

Charger reset)

Yes

Charge

Reduction

Mode

Yes

Expire

Set

Enable

Dynamic Charge

VENBAT > VEN

Current

Limit Test

IOUT > ILIM

IOUT + IBAT > ILIM?

Connect

ADP to BAT

and OUT

Power

Reduce

Charging

Current to BAT

Yes

YesYes

NoYes

Yes

AAT3672

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Applications Information

Adapter or USB Port Power Source

In the adapter mode, constant current charge levels up

to 1.6A may be programmed by the user. The ADP input

will operate over a range from 4.35V to 5.5V.

The constant fast charge current for the adapter input

mode is set by the RSET resistor connected between the

ADPSET pin and ground. The battery preconditioning or

trickle charge current is fixed at 10% of the programmed

fast charge constant current level. Refer to Table 3 for

recommended RSET values for a desired constant current

charge level. Battery charging states will be indicated via

the STAT1 and STAT2 display LEDs for the AAT3672-1

and -2, and via STAT1 for the AAT3672-3. Please refer to

the Battery Charge Status Indication discussion on page

19 of this datasheet for further details.

Charge Reduction

Under normal operation, the AAT3672 should be operat-

ed from an adapter power source with a sufficient capac-

ity to supply the desired constant charge current plus

any additional load which may be placed on the source

by the operating system. In the event that the power

source to the ADP pin is unable to provide the pro-

grammed fast charge constant current, or if the system

under charge must also share supply current with other

functions, the AAT3672 will automatically reduce the ADP

fast charge current level to maintain the integrity of the

source supply, power the operating system, and charge

the battery cell with the remaining available current.

The ADP charge reduction system becomes active when

the voltage on the ADP input falls below the ADP charge

reduction threshold (VCHR_TH), which is preset to 4.5V.

Should the input supply drop below the VCHR_TH threshold,

the charge reduction system will reduce the fast charge

current level in a linear fashion until the voltage sensed

on the ADP input recovers to a point above the charge

reduction threshold voltage. The ADP charge reduction

threshold (VCHR_TH) may be externally set to a value other

than 4.5V by placing a resistor divider network between

the ADP pin and ground with the center connected to the

CHRADP pin. The ADP charge reduction feature may be

disabled by shorting the CHRADP pin directly to the ADP

input pin.

The following equation may be used to approximate the

ADP charge reduction threshold above or below 4.5V:

VCHR_TH = 2.0V

(R4/[R4 + R3])

where R4 and R3 < 500k.

800k

VCH_REG= 2.0

VADP ADP

CHRADP

Figure 3: Internal Equivalent Circuit

for the CHRADP Pin.

Adapter Input Charge

Inhibit and Resume

The AAT3672 has an under-voltage lockout (UVLO) and

power on reset feature to protect the charger IC in the

event the input supply to the adapter pin drops below the

UVLO threshold. Under a UVLO condition, the charger will

suspend the charging process. When power is re-applied

to the adapter pin or the UVLO condition recovers, the

system charge control will asses the state of charge on

the battery cell and will automatically resume charging in

the appropriate mode for the condition of the battery.

Programming Fast Charge Current

The constant current charge level is user programmed

with a set resistor connected between the ADPSET pin

and ground. The accuracy of the constant charge cur-

rent, as well as the preconditioning trickle charge cur-

rent, is dominated by the tolerance of the set resistor

used. For this reason, a 1% tolerance metal film resistor

is recommended for the set resistor function. The con-

stant charge current levels from 100mA to 1.6A may be

set by selecting the appropriate value from Table 3.

AAT3672

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Charge current setting formula:

ICH_CC_ADP (typ) = · KII_CC_ADP

VADP

RSET

Constant Charge

Current (mA) Set Resistor Value (k)

100 665

200 324

300 215

400 162

500 127

800 76.8

1000 57.6

1600 36.5

Table 3: RSET Values.

For the AAT3672-3, the two enable inputs select between

four possible operating modes: two internally fixed

charging current modes (USB Low =100mA or USB high

= 500mA), an externally programmable charging cur-

rent mode, and a shutdown mode. The STAT1 function-

ality is identical for all three options.

EN1 EN2 Operating Mode

0 0 USB Low, 100mA charging current

0 1 USB High, 500mA charging current

1 0 Using RADP to program charging current

1 1 Shutdown mode

Table 4: AAT3672-3 Operating Modes.

Figure 4 shows the relationship of constant charging cur-

rent and set resistor values for the AAT3672.

RADP (kΩ)

Constant Charge Current (mA)

10 100 1000 10000

100

1000

10000

Constant Current

Pre-Conditioning

Figure 4: Constant Charging Current

vs. Set Resistor Values.

Battery Connection (BAT)

A single cell Li-Ion/Polymer battery should be connected

between BAT input and ground.

Battery Charge Status Indication

Charge Status Indicator Outputs

There are three device options. All options include

recharge sequence after adapter is inserted. The AAT3672-

1 and AAT3672-2 have two status (STAT1 and STAT2)

pins and one enable pin (EN); the AAT3672-3 has one

status pin (STAT1) and two enable pins (EN1 and EN2)

Charge State STAT1 STAT2

Pre-Charge ON ON

Fast-Charge ON OFF

End of Charge (Charge complete) OFF ON

Charge Disabled, Sleep Mode or

Fault Condition OFF OFF

No Battery (with Charge Enabled) Flash (1Hz,

40% duty)

Flash (1Hz,

40% duty)

Table 5: AAT3672-1 LED Status Indicators.

Charge State STAT1 STAT2

Pre-Charge or Fast-Charge ON OFF

End of Charge (Charge Complete,

Charge Disabled, or Sleep Mode) OFF OFF

Fault Condition OFF ON

No Battery (with Charge Enabled) Flash (1Hz,

40% duty) OFF

Table 6: AAT3672-2 LED Status Indicators.

Charge State STAT1

Pre-Charge or Fast-Charge ON

End of Charge (Charge Complete, Charge

Disabled, Sleep Mode, or Fault Condition) OFF

No Battery (with Charge Enabled) Flash (1Hz,

40% duty)

Table 7: AAT3672-3 LED Status Indicators.

Fault condition can be one of the following:

• Battery over-voltage (OV)

• Battery temperature sense hot or cold

• Battery charge timer time-out

• Chip thermal shutdown

AAT3672

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Status Indicator Display

Simple system charging status states can be displayed

using one LED each in conjunction with the STAT1 and

STAT2 pins of the AAT3672-1/-2 and the STAT1 pin of the

AAT3672-3. These pins have simple switches connecting

the LED’s cathodes to ground. Refer to Tables 5, 6, and 7

for LED display definitions. The LED anodes should be

connected to VADP

, depending upon system design require-

ments. The LED should be biased with as little current as

necessary to create reasonable illumination; therefore, a

ballast resistor should be placed between the LED cathode

and the STAT1 and STAT2 pins of the AAT3672-1/-2 and

the STAT1 pin of the AAT3672-3. A 2mA bias current

should be sufficient to drive most low cost green or red

LEDs. It is not recommended to exceed 8mA when driving

an individual status LED.

The required ballast resistor value can be estimated

using the following formulas:

When connecting to the adapter supply with a red LED:

RB(STAT1,2) = VADP - VFLED

ILED(STAT1,2)

Example:

RB(STAT1,2) = = 1.75kΩ

5.5V - 2.0V

2mA

Red LED forward voltage (VF) is typically 2.0V @ 2mA.

When connecting to the USB supply with a green LED:

RB(STAT1,2) = VUSB - VFLED

ILED(STAT1,2)

Example:

RB(STAT1,2) = = 900Ω

5.0V - 3.2V

2mA

Green LED forward voltage (VF) is typically 3.2V @ 2mA.

Protection Circuitry

Thermal Loop Control

Due to the integrated nature of the linear charging con-

trol pass devices for both the adapter and USB modes, a

special thermal loop control system has been employed

to maximize charging current under all operating condi-

tions.

The thermal management system measures the internal

circuit die temperature and reduces the charge current

when the device exceeds a preset internal temperature

control threshold. Once the thermal loop control becomes

active, the constant charge current is initially reduced by

a factor of 0.44.

The initial thermal loop current can be estimated by the

following equation:

Constant Charging: ITLOOP = ICCADP · 0.44

The thermal loop control re-evaluates the internal die

temperature every three seconds and adjusts the fast

charge current back up in small steps up to the full fast

charge current level or until an equilibrium current is

discovered and maximized for the given ambient tem-

perature condition. In this manner, the thermal loop

controls the system charge level. The AAT3672 will

always provide the highest possible level of constant cur-

rent in the fast charge mode for any given ambient tem-

perature condition.

Programmable Watchdog Timer

The AAT3672 contains a watchdog timing circuit which

operates in all charging modes. Typically a 0.1F ceram-

ic capacitor is connected between the CT pin and ground.

When a 0.1F ceramic capacitor is used, the device will

time a shutdown condition if the trickle charge mode

exceeds 50 minutes. When the device transitions to the

trickle charge to the fast charge constant current mode

and then to the constant voltage mode, the timing coun-

ter is reset and will time out after 6 hours.

Summary for a 0.1F used for the timing capacitor:

Trickle Charge (TC) time out = 50 minutes

Fast Charge Constant Current (CC) + Constant Voltage

(VC) mode time out = 6 hours

The CT pin is driven by a constant current source and will

provide a linear response to increases in the timing

capacitor value. Thus, if the timing capacitor were to be

doubled from the nominal 0.1F value, the time out time

of the CC + CV modes would be doubled. The corre-

sponding trickle charge time out time would be the com-

bined CC + VC time divided by 8.

If the programmable watchdog timer function is not

needed it may be disabled the terminating the CT pin to

ground. The CT pin should not be left floating or not

terminated; this will cause errors in the internal timing

control circuit.

The charge timer control will suspend the timing count in

any given mode in the event a fault condition occurs.

Such fault conditions include digital thermal loop charge

current reduction, battery charge reduction, battery tem-

AAT3672

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perature fault, and battery current sharing with the out-

put during the charging cycle. When the fault condition

recovers, the counter will resume the timing function.

The charge timer will automatically reset when the

AAT3672 enable pin is reset or cycled off and on. The

constant current provided to charge the timing capacitor

is very small and this pin is susceptible to noise and

changes in capacitance value. Therefore, the timing

capacitor should be physically located on the printed

circuit board layout as close as possible to the CT pin.

Since the accuracy of the internal timer is determined by

the capacitance value, a 10% tolerance or better ceram-

ic capacitor is recommended. Ceramic capacitor materi-

als such as X7R and X5R type are a good choice for this

application.

Battery Over-Voltage Protection

An over-voltage event is defined as a condition where

the voltage on the BAT pin exceeds the maximum bat-

tery charge voltage and is set by the over-voltage pro-

tection threshold (VBOVP). If an over-voltage condition

occurs, the AAT3672 charge control will shutdown the

device until voltage on the BAT pin drops below the over-

voltage protection threshold (VBOVP). The AAT3672 will

resume normal charging operation once the battery

over-voltage condition is removed.

Over-Temperature Shutdown

The AAT3672 has a thermal protection control circuit

which will shut down charging functions should the inter-

nal die temperature exceed the preset thermal limit

threshold.

Battery Temperature Fault Monitoring

In the event of a battery over-temperature condition, the

charge control will turn off the internal charge path

regulation device and disable the BAT-OUT dynamic

path. After the system recovers from a temperature

fault, the device will resume charging operation. The

AAT3672 checks battery temperature before starting the

charge cycle, as well as during all stages of charging.

Typically, batteries employ the use of a negative tem-

perature coefficient (NTC) thermistor that is integrated

into the battery.

Capacitor Selection

Input Capacitor

A 1F or larger capacitor is typically recommended for

CADP

. CADP should be located as close to the device ADP

pin as practically possible. Ceramic, tantalum, or alumi-

num electrolytic capacitors may be selected for CADP

There is no specific capacitor equivalent series resistance

(ESR) requirement for CADP

. However, for higher current

operation, ceramic capacitors are recommended for CADP

due to their inherent capability over tantalum capacitors

to withstand input current surges from low impedance

sources such as batteries in portable devices.

Typically, 50V rated capacitors are required for most of

the application to prevent any surge voltage. Ceramic

capacitors selected as small as 1206 are available which

can meet these requirements. Other voltage rating

capacitor can also be used for the known input voltage

application.

Charger Output Capacitor

The AAT3672 only requires a 1F ceramic capacitor on

the BAT pin to maintain circuit stability. This value should

be increased to 10F or more if the battery connection is

made any distance from the charger output.

System Power Output Capacitor

For proper load voltage regulation and operational stabil-

ity, a capacitor is required between OUT and GND. The

output capacitor connection to the ground pin should be

made as directly as practically possible for maximum

device performance. Since the regulator has been

designed to function with very low ESR capacitors,

ceramic capacitors in the 1.0F to 10F range are recom-

mended or best performance. Applications utilizing the

exceptionally low output noise and optimum power sup-

ply ripple rejection of the AAT3672 should use 2.2F or

greater values for the system power output capacitor.

Printed Circuit Board

Layout Recommendations

For proper thermal management and to take advantage

of the low RDS(ON) of the AAT3672, a few circuit board

layout rules should be followed: IN and BAT should be

routed using wider than normal traces, and GND should

be connected to a ground plane. To maximize package

thermal dissipation and power handling capacity of the

AAT3672 TDFN33 package, solder the exposed paddle of

the IC onto the thermal landing of the PCB, where the

thermal landing is connected to the ground plane. If heat

is still an issue, multi-layer boards with dedicated ground

planes are recommended. Also, adding more thermal

vias on the thermal landing would help transfer heat to

the PCB effectively.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

22 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Figure 4: AAT3672-1/-2 Evaluation Figure 5: AAT3672-1/-2 Evaluation

Board Top Layer. Board Mid1 Layer.

Figure 6: AAT3672-1/-2 Evaluation Figure 7: AAT3672-1/-2 Evaluation

Board Mid2 Layer. Board Bottom Layer.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Figure 8: AAT3672-3 Evaluation Figure 9: AAT3672-3 Evaluation

Board Top Layer. Board Mid1 Layer.

Figure 10: AAT3672-3 Evaluation Figure 11: AAT3672-3 Evaluation

Board Mid2 Layer. Board Bottom Layer.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

24 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

open

10K

1.5K

57.6K

71.5K

Green LEDD1

10μF

0.1μF

10μF

ENO

ENBAT

ADP

BAT

OUT

Red LED D2

STAT2

ADP

ENBAT 8

ADPSET

ENO

STAT1

CHRADP

9TERM 10

TS 11

BAT 12

OUT 13

CTGND 14

AAT3672-1/-2

TDFN44-16

Figure 12: AAT3672-1/-2 Evaluation Board Schematic.

open

10K

71.5K

57.6K

1.5K

Green LED

10μF

0.1μF

10μF

ENO

EN2

ENBAT

EN1

BAT

OUT

EN2

ADP

EN1

ENBAT 8

ADPSET

ENO

STAT1

CHRADP

9TERM 10

TS 11

BAT 12

OUT 13

CTGND 14

TDFN33-14

AAT3672-3

Figure 13: AAT3672-3 Evaluation Board Schematic.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Component Part Number Description Manufacturer

U1 AAT3672-1/-2IWP 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package Skyworks

R1 Chip Resistor 57.6k, 1%, 1/4W; 0603

Vishay

R2 Chip Resistor 71.5k, 5%, 1/4W; 0603

R5, R6 Chip Resistor 1.5k, 5%, 1/4W; 0603

R7, R8 Chip Resistor 10k, 5%, 1/4W; 0603

C4 GRM188R61A225KE34 0.1F 10V 10% X5R 0603 Murata

C1, C2, C3 GRM21BR71A106KE51L 10F 10V 10% X7R 0805

J1, J2, J3 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

D1 LTST-C190GKT Green LED; 0603 Lite-On Inc.

D2 LTST-C190CKT Red LED; 0603

Table 8: AAT3672-1/-2 Evaluation Board Bill of Materials (BOM).

Component Part Number Description Manufacturer

U1 AAT3672-3IWP 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package Skyworks

R1 Chip Resistor 57.6k, 1%, 1/4W; 0603

Vishay

R2 Chip Resistor 71.5k, 5%, 1/4W; 0603

R5 Chip Resistor 1.5k, 5%, 1/4W; 0603

R6, R7 Chip Resistor 10k, 5%, 1/4W; 0603

C4 GRM188R61A225KE34 0.1F 10V 10% X5R 0603 Murata

C1, C2, C3 GRM21BR71A106KE51L 10F 10V 10% X7R 0805

J1, J2, J3, J4 PRPN401PAEN Conn. Header, 2mm zip Sullins Electronics

D1 LTST-C190GKT Green LED; 0603 Lite-On Inc.

Table 9: AAT3672-3 Evaluation Board Bill of Materials (BOM).

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

26 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Ordering Information

Package Marking1Part Number (Tape and Reel)2

TDFN33-14 4RXYY AAT3672IWO-4.2-1-T1

TDFN33-14 3SXYY AAT3672IWO-4.2-2-T1

TDFN33-14 4QXYY AAT3672IWO-4.2-3-T1

Skyworks Green™ products are compliant with

all applicable legislation and are halogen-free.

For additional information, refer to Skyworks

Deﬁnition of Green™, document number

SQ04-0074.

Packaging Information

TDFN33-143

Top View Bottom View

3.000 ±

0.050

Index Area

3.000 ±

0.050

Detail "A"

1.650 ±

0.050

2.500 ±

0.050

0.203 REF

0.750 ±

0.050

0.000

0.100

- 0.000

Detail "A"

Side View

0.425 ±

0.050

0.400 BSC

0.180 ±

0.050

Pin 1 Indicator

(Optional)

1. XYY = assembly and date code.

2. Sample stock is generally held on part numbers listed in BOLD.

3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing

process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.

AAT3672

DATA SHEET

1.6A Dynamic Battery Charger and Power Manager

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201880B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a

service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-

works may change its documentation, products, services, speciﬁ cations or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no

responsibility whatsoever for conﬂ icts, incompatibilities, or other difﬁ culties arising from any future changes.

No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here-

under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.

THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR

PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES

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Customers are responsible for their products and applications using Skyworks products, which may deviate from published speciﬁ cations as a result of design defects, errors, or operation of products outside of pub-

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