AP1604ASNA - Anachip Corporation

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev.1.1 Jun. 27, 2005

1/7

 Features

- Input voltage range: 2.2V~5.5V (VOUT type)

- Oscillator frequency: 600KHz (Typ.)

- Internal reference: 1.0V (Typ.)

- High efficiency: 93% (Typ .)

- Stand-by capability: ISTB=2µA. (Typ.)

- Soft-start time set-up externally type possible

- Current limit and thermal shutdown protection

- Pb-Free Package: SOT23-5, SON-6(3×3×0.8mm)

 Applications

● Electronic Information Organizers

● Palmtops

● Cellular and portable phones

● Portable Audio Systems

● Various Multi-function Power Supplies

 General Descriptions

The AP1604 series are multi-functional step-down

DC/DC converters with built-in speed, low ON

resistance drivers. It is capable to deliver more than

800mA output current with external coil, diode and

capacitor.

Output voltage is set-up by the external resistors. (±

2.5% accuracy). The 600KHz AP1604 that can

work out with small value external components

comes out more compact board.

The device switches to and works under PFM mode

with light loads. It keeps at high efficiency for both

light loads and large output current.

AP1604 can be soft-start with a proper capacitor

connected between CE/SS pin and ground. The

stand-by current is less than 2uA when CE/SS pin

is at “LOW” status. The device is forced to switch

off as the voltage at that pin is lower than the

stipulated voltage.

 Pin Assignment

1 32

5 4

CE/SS

VOUT VCC

GND

SOT23-5

FB

(Top View)

AP1604A

SON-6

1

2

34

5

6

GNDCE

FB VOUT

VCC

SVCC

 Pin Descriptions

Pin Name Function

VOUT Output Voltage

VCC Input Supply

GND Ground

CE/SS Chip Enable / Soft Start

FB Feedback pin

SVCC Signal Power for SON only

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

2/7

 Ordering Information

AP1604 X X X

W: SOT23-5

SN: SON-6 (3*3*0.8mm)

Packing

A : Taping

Package

A: AP1604A

Version

 Block Diagrams

Phase

Compensation

Vref with

CE

+

-

PWM/PFM

Controller

+

-

Ramp Wave

Generator,

OSC

V

OUT

CE/SS GND

VCC

PWM

Comparator

FB

Current Limit

Soft

Start

ERR

AMP

SVCC

 Absolute Maximum Ratings

Ta=25°C

Symbol Parameter Ratings Units

VCC/SVCC V

IN Pin Voltage -0.3 ~ 6.5 V

VOUT V

OUT Pin Voltage -0.3 ~ VIN+0.3 V

VFB FB Pin Voltage -0.3 ~ VIN+0.3 V

VCE/SS CE/SS Pin Voltage -0.3 ~ VIN+0.3 V

Pd Continuous Total

Power Dissipation Internal limited

Topr Operating Ambient

Temperature -25 ~ +80 °C

Tstg Storage Temperature -40 ~ +125 °C

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

3/7

 Electrical Characteristics

VIN=5V, VOUT＝2V, Load=300mA, Ta=25°C

Sym. Parameter Conditions Min. Typ. Max. Units

VFB FB 0.975 1.0 1.025 V

VIN Input Voltage 2.2 - 5.5 V

Line Regulation VIN=2.2~5.5V, Load=10mA - - 0.12 %

Load Regulation IOUT=10~800mA - - 1.2 %

VUVLO UVLO Voltage（min.

operating voltage）

VCC, voltage required to maintain H at

VOUT - - 2 V

ICC Operating Current CE/SS=VIN, No Load - 100 150 µA

ICCQ Supply Current No external components,

CE/SS=VIN, VFB=1.2V - 90 120 µA

ISTB Stand-by Current No external components,

CE/SS=0V, VFB=0V - 2 - µA

ICL Current Limit peak current

VIN=5V, VOUT=2V 800 1000 1200 mA

Fosc Oscillator Frequency Load=300mA, VIN=5V, VOUT=2V 500 600 700 kHz

MAXDTY Maximum Duty Ratio 85 90 - %

PFMDTY PFM Duty Ratio No load 15 25 35 %

VCEH CE/SS ”High” Voltage Apply 1.4V (min.) to CE/SS, determine

VOUT ”High” 1.4 - - V

VCEL CE/SS ”Low” Voltage Same as VCEH, determine VOUT/”Low” - - 0.6 V

EFFI Efficiency VCC=5V, VOUT=3.3V, Load=300mA - 93 - %

Rdson Rdson Condition IOUT=300mA, VIN=5V, VOUT=2V - 350 450 mΩ

 Typical Performance Characteristics

Vcc v.s. Operating Current Vcc v.s. Quiescent Current

0

20

40

60

80

100

120

140

160

180

200

2.5 3 3.5 4 4.5 5 5.5

Vcc

(

V

)

Operating Current (uA)

0

20

40

60

80

100

120

140

160

180

200

2.533.544.555.5

Vcc (V)

Quiescent Current (uA)

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

4/7

 Typical Performance Characteristics (Continued)

Vcc v.s. Stand-by Current Vcc v.s. Frequency

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

2.5 3 3.5 4 4.5 5 5.5

Vcc (V)

Stand-by Current (uA)

500

520

540

560

580

600

620

640

660

680

700

2.533.544.555.5

Vcc (V)

Frequency (KHz)

Vcc v.s. Current Limit Vcc v.s. RDS(ON)

0.5

0.6

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

3 3.5 4 4.5 5 5.5

Vcc

(

V

)

Current Limit (A)

Current Limit

Vout=2V

0

100

200

300

400

500

600

2.5 3 3.5 4 4.5 5 5.5

RDS(ON) (mΩ)

Vcc (V)

Line Regulation Load Regulation

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

2.533.544.555.5

Vcc (V)

V / VOUT (%)

-3

-2

-1

0

1

2

3

0 100 200 300 400 500 600 700 800

Load (mA)

V / VOUT (%)

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

5/7

 Typical Application Circuit

0.1uF

V

IN

FB

V

CC

GND

10uH

AP1604A

V

OUT

CE/SS

68uF

2.2V ~ 5.5V

B240A R2

R1 0.1uF 68uF

V

OUT

10nF

100nF

~

1M

Ω

Vout = 1

×

(1 +

R1

R2 )

R1=100K ~ 200K

 Marking Information

(1) SOT23-5L

XX

: Identification code

(See Appendix)

Y

: Year: 0-9

M

: Month: A~L

SOT23-5L

XX Y M

7

123

45

Appendix

Part Number Package Identification

Code

AP1604A SOT23-5 ER

(2) SON-6L (3*3*0.8mm)

Date Code

Year: 0~9

Month: A~L

Identification Code

( See the table )

XX

Appendix

Part Number Package Identification

code

AP1604A SON-6L

(3*3*0.8mm) S4

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

6/7

 Package Information

(1) Package Type: SOT23-5L

θ

Gauge Plane

0.25 mm

L

L1

E1 E

e1

D

123

4

5

b

e

b1

b

CC1

Base

Metal

With

Plating

A2

A1

A

Seating Plane

0.10 C

5x

2(4x)

θ

1(4x)

θ

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 1.05 1.20 1.35 0.041 0.047 0.053

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 1.00 1.10 1.20 0.039 0.043 0.047

b 0.25 - 0.55 0.010 - 0.022

b1 0.25 0.40 0.45 0.010 0.016 0.018

c 0.08 - 0.20 0.003 - 0.008

c1 0.08 0.11 0.15 0.003 0.004 0.006

D 2.70 2.85 3.00 0.106 0.112 0.118

E 2.60 2.80 3.00 0.102 0.110 0.118

E1 1.50 1.60 1.70 0.059 0.063 0.067

L 0.35 0.45 0.55 0.014 0.018 0.022

L1 0.60 Ref. 0.024 Ref.

e 0.95 Bsc. 0.037 Bsc.

e1 1.90 Bsc. 0.075 Bsc.

θ 0o 5

o 10o 0

o 5

o 10o

θ1 3o 5

o 7

o 3

o 5

o 7

o

θ2 6o 8

o 10o 6

o 8

o 10o

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

Anachip Corp.

www.anachip.com.tw

Rev.1.1 Jun. 27, 2005

7/7

 Package Information (Continued)

(2) SON-6L (3×3×0.8mm)

E

E1 L

C0.10

SEATING PLANE

Pin1 ID Area

2x

C 0.25

Dimensions In Millimeters Dimensions In Inches

Symbol Min. Nom. Max. Min. Nom. Max.

A 0.70 0.75 0.80 0.028 0.030 0.031

A1 0.00 0.02 0.05 0.000 0.001 0.002

A3 0.203 REF. 0.008 REF

b 0.30 0.40 0.45 0.012 0.016 0.018

D 2.90 3.00 3.10 0.114 0.118 0.122

D1 1.90 2.10 2.30 0.075 0.083 0.091

E 2.90 3.00 3.10 0.114 0.118 0.122

E1 1.30 1.50 1.70 0.051 0.059 0.067

L 0.30 0.40 0.50 0.012 0.016 0.020

e 0.95 BSC. 0.037 BSC.

e1 1.90 BSC. 0.075 BSC.

y 0.00 - 0.08 0.000 - 0.003