Functional Diagram/ Typical Application Circuit
General Description
The MAX14576/MAX14636/MAX14637 are USB charger
detectors. The MAX14576/MAX14636/MAX14637 will
pass USB Battery Charger Specification Revision 1.2 (USB
BC 1.2) compliance tests. The MAX14636/MAX14637 can
also detect Apple chargers, and other nonstandard types.
These devices are capable of detecting multiple USB
battery charging methods, including standard downstream
ports (SDP), charging downstream ports (CDP), and dedi-
cated charger ports (DCP). The devices also feature USB
BC 1.2 defined dead-battery option support.
The MAX14576/MAX14636/MAX14637 feature analog
switches that are capable of passing USB Hi-Speed, full-
speed, and low-speed signals. The switches have low on-
resistance (3I, typ) and low on-capacitance (4.5pF, typ).
The CDN and CDP are high ESD protected up to Q15kV
Human Body Model (HBM), Q15kV IEC61000-4-2 Air Gap
Discharge, and Q 8kV IEC61000-4-2 Contact Discharge.
The MAX14576/MAX14636/MAX14637 are available in
a 10-pin (1.6mm x 2.1mm) UTQFN package and operate
over the 0°C to +70°C extended temperature range.
Benets and Features
●High Level of Integration
• Capability to Withstand -6V to +30V (Absolute
Maximum) on VBUS Line
• USB Battery Charger Detection
- Will Pass USB Battery Charger Specication
Rev 1.2 Compliance Tests
- USB DCP, SDP, and CDP Detection
- Proprietary Charger Detection Capability
(MAX14636/MAX14637)
• USB 2.0 Hi-Speed Switch with 3Ω (typ) On-Resistance
and 4.5pF (typ) On-Capacitance
• High ESD Protection on CDP and CDN
- ±15kV—HBM
- ±15kV—IEC 61000-4-2 Air-Gap Discharge
- ±8kV—IEC 61000-4-2 Contact Discharge
• ±15kV HBM ESD Protection VBUS When Bypassed
with 0.1µF or Greater Ceramic Capacitor
●Save Power in Portable Applications
• Low Supply Current (150µA, typ)
●Space Saving
• 10-Pin, 1.6mm x 2.1mm, UTQFN Package
Ordering Information/Selector guide appears at end of data
sheet.
Applications
●Cell Phones
●Digital Cameras
●eReaders
●Tablets
●Portable Industrial
Products
Click here for production status of specic part numbers.
19-6457; Rev 4; 8/18
MAX14576/MAX14636/
MAX14637
USB Charger Detectors
EVALUATION KIT AVAILABLE
MAX14576
MAX14636
MAX14637
USB
CHARGER
DETECTION
USB/MICRO-USB
CONNECTOR
INTERNAL
POWER
I/O
CONTROL
VBUS
VBUS
GND
D-
D+
SW_OPEN
TDN
TDP
GOOD_BAT
GND
1MΩ
CHG_AL_N
MICRO-
PROCESSOR
PMIC
VBUS
1MΩ
(MAX14636/
MAX14637)
1MΩ
(MAX14636/
MAX14637)
VIO VIO
CHG_DET
CDN
CDP
(All voltages referenced to GND.)
VVBUS ......................................................................-6V to +30V
CHG_AL_N............................................................-0.3V to +30V
SW_OPEN, GOOD_BAT ......................................... -0.3V to +6V
CHG_DET (Note 1) ............................. -0.3V to (VCCINT + 0.3V)
TDP, TDN ............................................ -0.3V to (VCCINT + 0.3V)
CDP, CDN............................................................... -0.3V to +6V
Continuous Current into All Terminals .............................. ±50mA
Continuous Power Dissipation (TA = +70°C)
UTQFN (derate 9mW/°C above +70°C) ......................722mW
Operating Temperature Range ...............................0°C to +70°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) ....................................... +260°C
PACKAGE TYPE: 10 ULTRA QFN
Package Code V101A2CN+1
Outline Number 21-0610
Land Pattern Number 90-0386
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA) 110.8°C/W
Junction to Case (θJC) 62.1°C/W
Absolute Maximum Ratings
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Note 1: VCCINT = min (VVBUS, +4.2V).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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2
MAX14576/MAX14636/
MAX14637
USB Charger Detectors
(VVBUS = 3.5V to 5.5V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VVBUS = 5.0V, TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Supply Voltage VVBUS 0 28 V
VBUS POR VVBUSUVLO 1.4 2.2 3.15 V
VBUS Supply Current IVBUS
VVBUS = 5.5V,
GOOD_BAT = 1, charger de-
tection not running
150 300 µA
VBUS Supply Current IVBUS12
VVBUS = 12V, GOOD_BAT = 1,
charger detection not running 10 16 mA
CHARGER DETECTION
VDP_SRC Voltage VDP_SRC IDP_SRC = 0 to 250µA 0.5 0.7 V
VDAT_REF Voltage VDAT_REF 0.25 0.4 V
VLGC Voltage VLGC 0.8 2.0 V
IDP_SRC Current IDP_SRC 7 10 µA
CDN Pulldown Resistor RDM_DWN 14.25 24.8 kΩ
CDP Pulldown Resistor RDP_DWN 14.25 24.8 kΩ
CDP and CDN Sink Current IDP_SINK
IDM_SINK
50 150 µA
CDP and CDN Weak Sink IWEAK VCDN = 3.6V 0.3 µA
VBUS Detection Ratio
VBUS_LOW
VVBUS = 5V
22.5 25 27.5
%VBUS_MID 42.3 47 51.7
VBUS_HIGH 76 80 89
CDP and CDN Overvoltage
Comparator
VVBUS = 5V, no load on
CHG_DET 4.2 V
Primary Detection Voltage Source
Time tVDP_SRC_ON 46 ms
VBUS Attach to CHG_DET tVBUS_CHG
From VVBUS > VVBDET to
CHG_DET change, assuming
DCD delay = 0ms; Figure 1,
Figure 2, Figure 3
250 ms
GOOD_BAT to SW_OPEN tGOOD_SW Figure 2, Figure 3 15 20 ms
DCD Time Out tDCD_TMO 0.7 0.8 0.89 s
VBUS Detect Threshold Rising VVBDET 3.3 3.5 4 V
VBUS Detect Threshold Hysteresis VVBDET_HYST 50 mV
USB ANALOG SWITCHES
Analog Signal Range (Note 3, Note 4) 0 VCCINT V
On-Resistance RONUSB ICDP, ICDN = 10mA,
VCDP, VCDN = 0 to 3V 3 6 Ω
On-Resistance Match Between
Channels ∆RONUSB ICDP, ICDN = 10mA,
VCDP, VCDN = 0.4V (Note 4) 0.5 Ω
Electrical Characteristics
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
(VVBUS = 3.5V to 5.5V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VVBUS = 5.0V, TA = +25°C.) (Note 2)
Note 2: All devices are 100% production tested at TA = +25°C. Specifications over the operating temperature range are
guaranteed by design.
Note 3: VCCINT = min (VVBUS, +4.2V).
Note 4: Not production tested. Guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
On-Resistance Flatness RFLATUSB
ICDP, ICDN = 10mA, VCDP,
VCDN = 0 to 3.3V (Note 4) 0.06 0.2 Ω
O󰀨-Leakage Current ILUSB(OFF)
Switch open, VTDN or
VTDP = 0.3V, 2.5V; VCDN or
VCDP = 2.5V, 0.3V
-360 360 nA
On-Leakage Current ILUSB(ON) Switch closed, VCDN or
VCDP = 0.3V, 2.5V -360 360 nA
DIGITAL SIGNALS (GOOD_BAT, CHG_DET, SW_OPEN, CHG_AL_N)
GOOD_BAT Input Logic High VIH 1.1 V
GOOD_BAT Input Logic Low VIL 0.5 V
GOOD_BAT Pulldown RPD 1MΩ
CHG_DET Output Logic High VOH ISOURCE = -3mA 2 4.36 V
CHG_DET Output Logic Low VOL ISINK = 3mA 0.4 V
SW_OPEN, CHG_AL_N
Output Leakage IOUTLEAK VIO = 5V, output is in high-
impedance -1 +1 µA
SW_OPEN, CHG_AL_N
Output Logic Low VOL_OD ISINK = 5mA 0.4 V
DYNAMIC PERFORMANCE
GOOD_BAT Debounce Time tGBDEB 4 ms
VBUS Debounce Time tCDEB 5 ms
O󰀨-Capacitance COFF
TDN, TDP applied
voltage = 0.5VP-P,
DC bias = 0V, f = 240MHz
2 pF
On-Capacitance CONCOM
CDN, CDP connected to
TDN, TDP; applied voltage =
0.5VP-P, DC bias = 0V,
f = 240MHz
4.5 pF
O󰀨-Isolation RL = 50Ω, f = 20kHz, VCDN,
VCDP = 0.5VP-P
-60 dB
ESD PROTECTION
CDN, CDP
Human Body Model ±15
kV
IEC61000-4-2 Air-Gap
Discharge ±15
IEC61000-4-2 Contact ±8
All Other Pins Human Body Model ±2 kV
Electrical Characteristics (continued)
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
Figure 1. Normal Charger Detection (No Dead Battery)
Figure 2. Charger Detection with Dead Battery
Figure 3. Charger Detection and Phone Flashing
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
tVBUS_CHG
+ tDCD_TMO
CHARGER DETECTION
COMPLETED
VBUS
GOOD_BAT
CHG_AL_N
CHG_DET
SW_OPEN
VBUS
GOOD_BAT
CHG_AL_N
CHG_DET
SW_OPEN
tVBUS_CHG
+ tDCD_TMO tGOOD_SW
CHARGER DETECTION
COMPLETED
tGOOD_SW
tVBUS_CHG
+ tDCD_TMO
CHARGER DETECTION
COMPLETED
VBUS
GOOD_BAT IGNORED
CHG_AL_N
CHG_DET
SW_OPEN
Typical Operating Characteristics
(VVBUS = 5.0V, TA = +25°C, unless otherwise noted)
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
0
2
4
6
8
10
12
-5 0 5 10 15 20 25 30
IVBUS (mA)
VVBUS (V)
VBUS SUPPLY CURRENT
vs. SUPPLY VOLTAGE
toc01
CDP/CDN SHORTED
GOOD_BAT = HIGH
TA= +25ºC
TA= +70ºC
TA= 0ºC
0
2
4
6
8
10
12
-5 0 5 10 15 20 25 30
I
VBUS
(mA)
V
VBUS
(V)
V
BUS
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
toc03
T
A
= +25ºC
T
A
= +70ºC
T
A
= 0ºC
CDP/CDN 15kΩTO GND
GOOD_BAT = LOW
0
2
4
6
8
10
12
-5 0 5 10 15 20 25 30
I
VBUS
(mA)
V
VBUS
(V)
VBUS SUPPLY CURRENT
vs. SUPPLY VOLTAGE
toc02
CDP/CDN 15kΩTO GND
GOOD_BAT = HIGH
T
A
= +25ºC
T
A
= +70ºC
T
A
= 0ºC
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
01234
ON-RESISTANCE (Ω)
CDN/CDP VOLTAGE (V)
ANALOG SWITCH ON-RESISTANCE
vs. CDN/CDP VOLTAGE
toc04
TA= +25ºC
TA= +70ºC
TA= 0ºC
ANALOG SWITCH FREQUENCY
RESPONSE
toc05
FREQUENCY (MHz)
1001010.1 1000
MAGNITUDE (dB)
-100
-80
-60
-40
-20
20
0
-120
ON-LOSS
OFF-ISOLATION
0
20
40
60
80
100
120
140
160
180
200
010 20 30 40 50 60 70
LEAKAGE CURRENT (nA)
TEMPERATURE (ºC)
CDN.CDP LEAKAGE CURRENT
vs. TEMPERATURE
toc06
VCDN/CDP = 3.3V
OFF-LEAKAGE
ON-LEAKAGE
USB EYE TRANSMIT DIAGRAM
(MEASURE AT TEST POINT TP3 AS
DEFINED IN USB 2.0 SPECIFICATION)
DIFFERENTIAL SIGNAL (V)
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
toc07
1.2 1.60.80.40 2.01.0 1.40.60.2 1.8
TIME (ns)
PIN NAME FUNCTION
1SW_OPEN
Data Switches Open Indicator. SW_OPEN is low when switches are closed. SW_OPEN is high
impedance when switches are open. SW_OPEN is an open-drain output. Connect SW_OPEN to a
pullup resistor externally.
2 TDN USB Transceiver D- Connection
3 TDP USB Transceiver D+ Connection
4 CHG_AL_N Charging Allow Indicator. CHG_AL_N is low when VBUS is valid and charging is allowed.
CHG_AL_N is an open-drain output. Connect CHG_AL_N to a pullup resistor externally.
5GOOD_BAT Good Battery Digital Input. Set GOOD_BAT low for a dead battery and enable USB BC 1.2 compliant
dead battery charging. Set GOOD_BAT high for a good battery.
6 GND Ground
7 CDP USB Connector D+ Connection
8 CDN USB Connector D- Connection
9 VBUS
USB VBUS Input. Bypass VBUS to ground with a 0.1µF ceramic capacitor as close to the device as
possible to achieve high ±15kV HBM ESD protection.
10 CHG_DET Charger Detection Push-Pull Output. CHG_DET indicates the capability of the connected charger type
(see Tables 1, 2, 3).
Pin Description
Pin Conguration
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
1 2
76
3 4
5GOOD_BAT
SW_OPEN TDN TDP CHG_AL_N
VBUS CDN CDP GND
CHG_DET 10
98
+
UTQFN
(1.6mm x 2.1mm)
TOP VIEW
MAX14576
MAX14636
MAX14637
Detailed Description
The MAX14576/MAX14636/MAX14637 detect battery
charging sources as defined in USB Battery Charging
Specification Rev 1.2 (USB BC 1.2). These devices
are capable of detecting multiple USB battery charging
methods including SDP, CDP, and DCP. The MAX14636/
MAX14637 are also capable of detecting Apple chargers,
and other nonstandard types (e.g., TomTom charger, and
PC PS2 adapter). The devices also feature USB BC1.2
defined dead battery option support.
USB Charger Detection
The charger detection starts when VBUS rises above
the threshold. After the type of charger is determined,
the MAX14576/MAX14636/MAX14637 set SW_OPEN,
CHG_AL_N, and CHG_DET according to the charger
type found (Table 1, Table 2, Table 3).
In case of SDP and CDP detection, dead battery mode
(DB mode) is entered if GOOD_BAT is low at the end of
charger detection. After entering in DB mode, a 45 minute
timer starts, VDP_SRC is set on CDP and the device is
allowed to charge at a 100mA rate. During DB mode, if
GOOD_BAT goes high, then DB mode ends, VDP_SRC
is removed and USB switches are closed. If GOOD_BAT
goes low again before the 45 minute timer expires, DB
mode is entered again. If GOOD_BAT is low when the
45 minute timer expires, DB mode ends and the device
is not allowed to charge until VBUS is removed and
reconnected. For GOOD_BAT sensitivity in DB mode,
the MAX14576/MAX14636 treat CDP as SDP and the
MAX14637 treats CDP as DCP.
USB Switches
The switches between CDP/CDN and TDP/TDN are low
capacitance and low resistance, and capable of passing
Hi-Speed USB signals. The switches are normally open
when no valid VBUS is present. When valid VBUS is
applied, the switches act according to the charger found
(Table 1, Table 2, Table 3).
ATTACHED
CHARGING SOURCE
INPUT OUTPUTS USB
SWITCHES SYSTEM
GOOD_BAT SW_OPEN CHG_AL_N CHG_DET
DCP X Hi-Z Low High Open Charge with full
current
CDP
High Low Low High Closed Charge with full
current
Low Hi-Z Low High Open Charge with full
current
SDP/Apple® Charger/
TomTom® Charger*
High Low Low Low Closed Charge with
100mA
Low Hi-Z Low Low Open Charge with
100mA
PS2 X Hi-Z Low Low Open Charge with
100mA
No Valid VBUS X Hi-Z Hi-Z Low Open X
X = Don’t care.
*Detected as SDP after DCD timeout
Apple is a registered trademark of Apple, Inc.
TomTom is a registered trademark of TomTom International.
Table 1. Charger Detection and Events (MAX14576)
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
ATTACHED
CHARGING SOURCE
INPUT OUTPUTS USB
SWITCHES SYSTEM
GOOD_BAT SW_OPEN CHG_AL_N CHG_DET
DCP/Apple Charger/
TomTom Charger** X Hi-Z Low High Open Charge with full
current
CDP
High Low Low High Closed Charge with full
current
Low Hi-Z Low High Open Charge with full
current
SDP
High Low Low Low Closed Charge with
100mA
Low Hi-Z Low Low Open Charge with
100mA
PS2 X Hi-Z Low Low Open Charge with
100mA
No Valid VBUS X Hi-Z Hi-Z Low Open X
ATTACHED
CHARGING SOURCE
INPUT OUTPUTS
USB
SWITCHES SYSTEM
GOOD_BAT SW_OPEN CHG_AL_N CHG_DET
DCP/Apple Charger X Hi-Z Low High Open Charge with full
current
CDP X Low Low High Closed Charge with full
current
SDP
High Low Low Low Closed Charge with
100mA
Low Hi-Z Low Low Open Charge with
100mA
PS2 X Hi-Z Low Low Open Charge with
100mA
No Valid VBUS X Hi-Z Hi-Z Low Open X
X = Don’t care.
**TomTom charger detected as DCP after DCD timeout.
X = Don’t care.
Table 2. Charger Detection and Events (MAX14636)
Table 3. Charger Detection and Events (MAX14637)
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
Applications Information
Hi-Speed USB
Hi-Speed USB requires careful PCB layout with 45Ω
single-ended/90Ω differential controlled-impedance
matched traces of equal lengths.
Extended ESD Protection
ESD protection structures are incorporated on all pins
to protect against electrostatic discharges up to ±2kV
(Human Body Model) encountered during handling and
assembly. CDN and CDP are further protected against
ESD up to ±15kV (HBM), ±15kV (Air-Gap Discharge
method described in IEC 61000-4-2) and ±8kV (Contact
Discharge Method described in IEC 61000-4-2) without
damage. The VBUS input withstands up to ±15kV (HBM) if
bypassed with a 0.1µF ceramic capacitor close to the pin.
The ESD structures withstand high ESD both in normal
operation and when the device is powered down. After
an ESD event, the MAX14576/MAX14636/MAX14637
continue to function without latchup.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
Figure 4 shows the Human Body Model, and Figure 5
shows the current waveform it generates when discharged
into a low impedance. This model consists of a 100pF
capacitor charged to the ESD voltage of interest that is
then discharged into the device through a 1.5kΩ resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The major difference
between tests done using the Human Body Model and
IEC 61000-4-2 is higher peak current in IEC 61000-4-2
because series resistance is lower in the model. Hence,
the ESD withstand voltage measured to IEC 61000-4-2
is generally lower than that measured using the Human
Body Model. Figure 6 shows the IEC 61000-4-2 model,
and Figure 7 shows the current waveform for the IEC
61000-4-2 ESD Contact Discharge test.
Figure 4. Human Body ESD Test Model Figure 5. Human Body Current Waveform
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
CS
100pF
RC
1MΩ
RD
1.5kΩ
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
IR
10%
0
0
AMPERES
Figure 6. IEC 61000-4-2 ESD Test Model Figure 7. IEC 61000-4-2 ESD Generator Current Waveform
PART TEMP RANGE
APPLE
CHARGE CUR-
RENT
TomTom CHARGE
CURRENT TOP MARK PIN-PACKAGE
MAX14576CVB+T 0°C to +70°C 100mA 100mA ABD 10 UTQFN
MAX14636CVB+T 0°C to +70°C Full Current Full Current ABE 10 UTQFN
MAX14637CVB+T 0°C to +70°C Full Current Not Supported ABG 10 UTQFN
MAX14576EVB+T† -40°C to +85°C 100mA 100mA ABD 10 UTQFN
MAX14636EVB+T† -40°C to +85°C Full Current Full Current ABE 10 UTQFN
MAX14637EVB+T† -40°C to +85°C Full Current Not Supported ABG 10 UTQFN
Ordering Information/Selector Guide
Chip Information
PROCESS: BiCMOS
+ Denotes a lead(Pb)-free package/RoHS-compliant package.
T = Tape and reel
† Part no longer available. Replaced by MAX14xxxCVB+T
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MAX14576/MAX14636/
MAX14637
USB Charger Detectors
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
CS
150pF
RC
50Ω to 100Ω
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
tR = 0.7ns to 1ns 30ns
60ns
t
100%
90%
10%
I
PEAK
I
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 9/12 Initial release —
1 1/13 Removed future product asterisks from the MAX14636/MAX14637 11
2 1/14 Edited Functional Diagram/Typical Application Circuit 1
3 6/18 Updated temperature range, Typical Operating Characteristics, and Ordering
Information table 1–4, 6, 11
4 8/18 Updated Ordering Information table 11
Revision History
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2018 Maxim Integrated Products, Inc.
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MAX14576/MAX14636/
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USB Charger Detectors
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