MAX77757_技术文档

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MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Benefits and Features

General Description

•

Up to 16V Protection

The MAX77757 is a standalone 3.15A charger with

13.7V Maximum Input Operating Voltage

3.15A Maximum Charging Current

6A Discharge Current Protection

• No Firmware or Communication Required

• Integrated CC Detection for USB Type-C

• Integrated BC1.2 Detection for Legacy SDP,

DCP, CDP, and DCD Timeout

®

integrated USB Type-C CC detection with JEITA

compliance that supports reverse boost capability. The

fast-charge current is easily configured with resistors.

The MAX77757 operates with an input voltage of 4.5V

to 13.7V and has a maximum input current limit of 3A.

The IC also implements the adaptive input current limit

(AICL) function that regulates the input voltage by

reducing input current to prevent the voltage of a weak

adapter from collapsing or folding back.

• Integrated USB Detection for Common

Proprietary Charger Types

• Automatic Input Current Limit Configuration

• Input Voltage Regulation with Adaptive Input

Current Limit (AICL)

The USB Type-C Configuration Channel (CC) detection

pins on the MAX77757 enable automatic USB Type-C

power source detection and input current limit

configuration. To support a variety of legacy USB types

as well as proprietary adapters, the IC also integrates

BC1.2 detection using the D+ and D- pins. The IC runs

the CC pin and BC1.2 detection automatically as soon

as a USB plug is inserted without any software control.

•

Reverse Boost Capability up to 5.1V, 1.5A

Termination Voltage

• 4.1V to 4.5V for Li-ion and Li-poly Batteries

• 3.6V/3.7V for LiFePO₄Battery

•

Safety

• Charge Safety Timer

• JEITA Compliance with NTC Thermistor

(MAX77757J)

• HOT/COLD Stop Charging with NTC Thermistor

(MAX77757H)

The IC also offers reverse-boost capability up to 5.1V

and 1.5A, which can be enabled with the ENBST pin.

The STAT pin indicates charging status while the INOKB

pin indicates valid input voltage. Charging can be

stopped by pulling the THM pin low.

• Thermal Shutdown

The MAX77757 is equipped with a Smart Power

Selector™ and a battery true-disconnect FET to control

the charging and discharging of the battery or to isolate

the battery in case of a fault. The MAX77757 is offered

in several variants to support Li-ion batteries with various

termination voltages from 4.1V to 4.5V. It also has a 3.6V

termination voltage option for LiFePO₄batteries. The IC

comes in a 3mm x 3mm, 0.4mm pitch, 24-lead FC2QFN

package making it suitable for low-cost PCB assembly.

•

Pin Control of All Functions

• Resistor Configurable Fast-Charge Current

• ENBST Pin to Enable and Disable Reverse Boost

• STAT Pin to Indicate Charging Status

• INOKB Pin to Indicate Input Power-OK

• THM Pin to Disable Charge

•

Integrated Power Path

Integrated Battery True-Disconnect FET

3mm x 3mm, 24-Lead FC2QFN Package

Applications

Ordering Information appears at end of data sheet.

•

Mobile Point-of-Sale (mPOS) Terminals

Portable Medical Devices

Wireless Headphones

GPS Trackers

Charging Cradles for Wearable Devices

Power Banks

Mobile Routers

19-100986; Rev 1; 3/21

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Simplified Block Diagram

4.5V TO 13.7V/3A

BYP

CHGIN

10µF +

22µF

2.2µF

USB TYPE-C

CONNECTOR

DP

DN

BST

LX

0.1µF

CC2

CC1

MAX77757

0.47µH

2x10µF

V

SYS

PVL

SYS

2.2µF

INOKB

STAT

PGND

ENBST

IFAST

3.15A

BATT

THM

10µF

V_PVL

2.2µF

V

DD

GND

T

THERMISTOR

www.maximintegrated.com

Maxim Integrated | 2

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Absolute Maximum Ratings

CHGIN to GND................................................-0.3V to +16.0V

BYP, LX to PGND ...........................................-0.3V to +16.0V

BATT, SYS, INOKB, STAT, ENBST to GND .....-0.3V to +6.0V

BST to PVL......................................................-0.3V to +16.0V

BST to LX..........................................................-0.3V to +2.2V

DN, DP to GND .................................................-0.3V to +6.0V

CC1, CC2 to GND.............................................-0.3V to +6.0V

V

, PVL, IFAST, THM to GND........................ -0.2V to +2.2V

DD

V

, BYP Continuous Current .............................3.2A

CHGIN

RMS

LX, PGND Continuous Current ..................................3.5A

SYS, BATT Continuous Current.................................4.5A

Operating Temperature Range ........................-40°C to +85°C

Storage Temperature Range ......................... -65°C to +150°C

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

24-Lead FC2QFN

Package Code

F243A3F+1

21-100385B

90-100128A

Outline Number

Land Pattern Number

Thermal Resistance, Four-Layer Board:

Junction-to-Ambient (θ

)

31°C/W

7.5°C/W

JA

Junction-to-Case Thermal Resistance (θ

)

JC

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.

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.

Electrical Characteristics

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GENERAL ELECTRICAL CHARACTERISTICS

Battery Only Quiescent

Current

SWITCHING MODE CHARGER

I

USBC as UFP and BATT = SYS = 3.6V

Operating voltage (Note 1)

30

50

µA

BATT_Q

V

CHGIN_

UVLO

CHGIN_

OVLO

CHGIN Voltage Range

V

CHGIN

CHGIN Overvoltage

Threshold

V

rising

falling

13.4

13.7

300

14

CHGIN_OVLO

CHGIN

CHGIN Overvoltage-

Threshold Hysteresis

CHGIN to GND

Minimum Turn-On

Threshold Accuracy

CHGIN to SYS

CHGINH_OVL

O

mV

CHGIN

V

rising

4.6

4.7

4.8

V

CHGIN_UVLO

CHGIN

V

+

V

+

V

+

SYS

0.12

SYS

0.20

SYS

0.28

Minimum Turn-On

Threshold

V

CHGIN2SYS

V

www.maximintegrated.com

Maxim Integrated | 3

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CHGIN Adaptive

Voltage Regulation

Threshold Accuracy

CHGIN Current Limit

Range

V

4.4

4.5

4.6

V

CHGIN_REG

Automatically configured after charger

type detection

CHGIN_ILIM

0.5

3.0

4

A

V

= 5.0V, charger enabled, V

=

SYS

CHGIN

= 4.5V, (no switching, battery

BATT

CHGIN Supply Current

I

2.7

mA

IN

charged)

Charger enabled, 500mA input current

setting

Charger enabled, 1500mA input current

setting

Charger enabled, 3000mA input current

setting

423

1300

2600

460

1400

2800

500

1500

3000

V

Input Current

CHGIN

Limit

I

mA

ms

INLIMIT

Time required for the charger input to

cause CHGIN capacitor to decay from

6.0V to 4.3V

CHGIN Self-Discharge

Down to UVLO Time

t

100

INSD

CHGIN Input Self-

Discharge Resistance

CHGIN to BYP

Resistance

R

44

45

kΩ

INSD

R

Bidirectional

mΩ

CHGIN2BYP

LX High-Side

Resistance

R

60

20

mΩ

HS

LX Low-Side Resistance

R

LS

BATT to SYS Dropout

Resistance

R

BAT2SYS

Calculation estimates a 0.04Ω inductor

resistance (R )

L

CHGIN to BATT

Dropout Resistance

R

165

mΩ

CHGIN2BAT

R

= R

CHGIN2BYP

+ R + R

HS

CHGIN2BAT

+ R

L

BAT2SYS

LX = PGND or BYP, T = +25°C

0.01

1

10

A

LX Leakage Current

BST Leakage Current

µA

LX = PGND or BYP, T = +85°C

A

BST = PGND or 1.8V, T = +25°C

0.01

1

A

BST = PGND or 1.8V, T = +85°C

A

V

= 5V, V

= 0V, LX = 0V,

BYP

CHGIN

0.01

1

10

charger disabled, T = +25°C

A

BYP Leakage Current

SYS Leakage Current

µA

V

= 5V, V

= 0V, LX = 0V,

BYP

CHGIN

charger disabled, T = +85°C

A

V

= 0V, V

= 4.2V, charger

SYS

BATT

0.01

1

disabled, T = +25°C

A

V

= 0V, V

= 4.2V, charger

SYS

BATT

disabled, T = +85°C

A

Minimum ON Time

Minimum OFF Time

Buck Current Limit

t

75

ns

A

ON-MIN

t

OFF-MIN

I

5.16

6.0

6.84

LIM

www.maximintegrated.com

Maxim Integrated | 4

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Reverse Boost

Non-switching; output forced 200mV

above its target regulation voltage

2000

µA

Quiescent Current

Reverse Boost BYP

Voltage in OTG Mode

CHGIN Output Current

Limit

V

4.94

5.1

5.26

V

BYP.OTG

I

CHGIN.OTG.LI

M

3.4V < V

BATT

< 4.5V

1500

1725

mA

Discontinuous inductor current (i.e., skip

mode)

±150

-0.3

Reverse Boost Output

Voltage Ripple

mV

%

Continuous inductor current

T

= +25°C, BATT regulation voltage

A

-0.9

-1

+0.3

+0.5

3.15

(See the Ordering Information table)

= 0°C to +85°C, BATT regulation

BATT Regulation

Voltage Accuracy

T

A

voltage (See the Ordering Information

table)

-0.3

Fast-Charge Current

Program Range

External resistor programmable

0.5

A

V

> V

, programmed for 3.0A

, programmed for 2.0A

, programmed for 0.5A

2850

1900

465

3000

2000

500

3150

2100

535

BATT

SYSMIN

Fast-Charge Currents

I

mA

FC

BATT

V

BATT

rising for termination voltage from

BATT

Trickle Charge

Threshold

V

4.1V to 4.5V; trickle charge is disabled for

3.6V option

3.0

2.4

3.1

3.2

2.6

V

TRICKLE

Precharge Threshold

V

rising

2.5

V

PRECHG

BATT

Prequalification

Threshold Hysteresis

V

Applies to both V

and V

PRECHG

100

mV

PQ-H

TRICKLE

I

for termination voltage from

TRICKLE

Trickle Charge Current

I

4.1V to 4.5V option; trickle charge is

disabled for 3.6V option

270

300

330

mA

TRICKLE

PRECHG

Precharge Charge

Current

Charger Restart

Threshold

Charger Restart

Deglitch Time

Top-Off Current

Program Range

40

50

55

80

mA

mV

ms

mA

V

RSTRT

100

130

150

10mV overdrive, 100ns rise time

I

See Table 3

50

150

TO

Programmed for 150mA

Programmed for 50mA

130

25

150

50

170

75

Top-Off Current

Accuracy

mA

ms

Charge Termination

Deglitch Time

t

2mV overdrive, 100ns rise/fall time

30

TERM

Charger Soft-Start Time

t

1.5

70

ms

SS

I

= 10mA

mV

BATT

BATT to SYS Reverse

Regulation Voltage

V

BSREG

Load regulation during the reverse

regulation mode

1

mV/A

V

For termination voltage from 4.1V to 4.5V

For 3.6V termination voltage

3.5

3.0

Minimum SYS Voltage

V

SYSMIN

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Maxim Integrated | 5

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum SYS Voltage

Accuracy

V

-3

+3

%

SYSMIN

Applies to both low-battery precharge and

trickle modes

Prequalification Time

t

30

min

h

PQ

Fast-Charge Constant

Current Plus Fast-

Charge Constant

Voltage Time

t

6

FC

Top-Off Time

t

30

s

TO

Timer Accuracy

-20

+20

%

Junction Temperature

Thermal Regulation

Loop Setpoint Program

Range

Junction temperature when charge

current is reduced

T

130

°C

REG

Thermal Regulation

Gain

-157.5

74

mA/°C

%

AT

JREG

I

= 3.15A

FC

V_THM/V_PVLrising, 1% hysteresis

(thermistor temperature falling)

THM Threshold, COLD

THM Threshold, COOL

THM Threshold, WARM

THM Threshold, HOT

THM_COLD

THM_COOL

THM_WARM

THM_HOT

72.5

63.5

31

75.5

66.5

34

V_THM/V_PVLrising, 1% hysteresis

(thermistor temperature falling)

65

32.5

23

%

V_THM/V_PVLfalling, 1% hysteresis

(thermistor temperature rising)

V_THM/V_PVLfalling, 1% hysteresis

(thermistor temperature rising)

21.5

4.5

24.5

V_THM/V_PVLfalling, 1% hysteresis

Charger Disable

Threshold

V

CHGR_EN

6

7.5

1

(charger is disabled below this threshold)

V_THM= GND or V_PVL; T_A= +25°C

V_THM= GND or V_PVL; T_A= +85°C

0.1

μA

THM Input Leakage

Current

Battery Overcurrent

Threshold

Battery Overcurrent

Debounce Time

Battery Overcurrent

Retry

6.0

A

ms

s

I

t

BOVCR

BOVRC

6

0.15

t

OCP_RETRY

Battery Overcurrent

Protection Quiescent

Current

3 + I_BATT

/18040

µA

I

BOVRC

System Power-Up

Current

System Power-Up

Voltage

35

50

80

mA

V

I

SYSPU

V

rising, 100mV hysteresis

SYS

1.9

2.0

2.1

V

SYSPU

INOKB, STAT

Logic Input Leakage

Current

0.1

1

µA

www.maximintegrated.com

Maxim Integrated | 6

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Output Low Voltage

INOKB, STAT

I

= 5mA

source

0.4

V

= 5.5V, T = +25°C

A

SYS

-1

0

+1

Output High Leakage

INOKB, STAT

µA

= 5.5V, T = +85°C

A

0.1

ENBST

ENBST Logic Input Low

Threshold

V

IL

0.4

V

ENBST Logic Input High

Threshold

V

IH

1.4

ENBST Logic Input

Leakage Current

ENBST = 5.5V (including current through

pulldown resistor)

I

ENBST

24

60

µA

kΩ

ENBST Pulldown

Resistor

R

ENBST

235

CHARGER DETECTION

t

BC1.2 State Timeout

TMO

180

700

200

800

220

900

ms

Data Contact Detect

Time-Out

t

DCDtmo

Proprietary Charger

Debounce

t

PRDeb

5

7.5

35

50

10

39

55

ms

Primary to Secondary

Timer

t

PDSDWait

27

45

Charger Detection

Debounce

t

CDDeb

DP and DN pins; threshold in percent of

V_BUSvoltage

3V < V_BUS< 5.5V

V

VBUS64 Threshold

VBUS64 Hysteresis

VBUS47 Threshold

VBUS47 Hysteresis

VBUS31 Threshold

BUS64

57

43.3

26

64

0.015

47

71

51.7

36

%

V

BUS64_H

DP and DN pins; threshold in percent of

V_BUSvoltage

3V < V_BUS< 5.5V

V

BUS47

%

V

0.015

31

DP and DN pins; threshold in percent of

V_BUSvoltage

3V < V_BUS< 5.5V

V

BUS31

WEAK

%

VBUS31 Hysteresis

IWEAK Current

0.015

0.1

20

V

I

0.01

14.25

7

0.5

24.8

13

µA

kΩ

µA

R

RDM_DWN Resistor

IDP_SRC Current

DM_DWN

I

/I

DP_SRC DCD Accurate over 0V to 2.5V

10

I

/

DM_SINK

IDM_SINK Current

Accurate over 0.15V to 3.6V

45

80

125

µA

I

DATSINK

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Maxim Integrated | 7

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

(Limits are 100% tested at T = +25°C. Limits over the operating temperature range and relevant supply voltage range are guaranteed

A

by design and characterization.)

PARAMETER

VLGC Threshold

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

V

LGC

1.62

1.7

1.9

V

VLGC Hysteresis

LGC_H

0.015

0.32

V

VDAT_REF Threshold

VDAT_REF Hysteresis

DAT_REF

0.25

0.5

0.4

0.7

V

DAT_REF_H

0.015

V

/

DN_SRC

Accurate over I

= 0 to 200µA

VDN_SRC Voltage

VDP_SRC Voltage

LOAD

0.6

V

SRC06

V

/

DP_SRC

= 0 to 200µA

0.5

3

0.6

6.1

0.7

12

V

SRC06

R

COMP2 Load Resistor

USB

Load resistor on DP/DN

MΩ

CC DETECTION

Measured at CC pins with 126kΩ load;

IDFP1.5_CC enable and V_AVL≥ 2.5V

CC Pin Voltage in DFP

1.5A Mode

V

CC_PIN

1.85

V

60µA ≤ I ≤ 600µA

CC_

CC Pin Clamp Voltage

CC_ClAMP

1.1

1.32

5.5

CC Pin Clamp Voltage

(5.5V)

I

< 2mA

CC_

5.25

CC UFP Pulldown

Resistance

R

PD_UFP

-10%

5.1K

+10%

Ω

CC DFP 1.5A Current

Source

I

DFP1.5_CC

-8%

0.15

0.61

180

0.2

+8%

0.25

0.7

µA

V

CC RA RD Threshold

RA_RD0.5

CC UFP 0.5A RD

Threshold

V

UFP_RD0.5

0.66

V

CC UFP 0.5A RD

Hysteresis

V

UFP_RD0.5_H

0.015

1.23

0.15

V

CC UFP 1.5A RD

Threshold

V

UFP_RD1.5

1.16

1.31

15

CC UFP 1.5A RD

Hysteresis

V

UFP_RD1.5_H

V

Max time allowed from removal of voltage

t

CC Pin Power-Up Time

ClampSwap

ms

clamp till 5.1kΩ resistor attached

t

CC Detection Debounce

Type-C Debounce

CCDeb

100

10

119

15

1

200

20

ms

PDDeb

t

Type-C Quick Debounce

QDeb

0.9

1.1

The CHGIN input must be less than V

to turn on.

and greater than both V

and V for the charger

CHGIN2SYS

Note 1:

CHGIN_OVLO

CHGIN_UVLO

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Maxim Integrated | 8

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Pin Configuration

TOP VIEW

23

21

24

22

20

19

1

2

18

17

16

BST

PGND

PVL

INOKB

STAT

CC2

SYS

3

4

MAX77757

SYS

15

14

13

BATT

5

6

CC1

DP

BATT

7

8

9

10

11

12

(3mm x 3mm, 0.4mm PITCH)

Pin Descriptions

NAME

FUNCTION

Provides Drive To High-Side Internal nMOS. Connect a 0.1μF/6.3V bootstrap capacitor between this pin

and the LX node.

1

BST

Charger Input Valid, Active-Low Logic Output Flag. Open-drain output indicates when valid voltage is

present at CHGIN.

Open-Drain Charge Status Indication Output. STAT is toggling low and high impedance during charge.

STAT becomes low when top-off threshold is detected and in done state. STAT becomes high

impedance when charge faults happen.

2

3

INOKB

STAT

4

5

6

7

8

9

CC2

CC1

DP

USB Type-C CC2 Connection

USB Type-C CC1 Connection

Common Positive Output 1. Connect to D+ on USB Type-C or micro-USB connector.

Common Negative Output 1. Connect to D- on USB Type-C or micro-USB connector.

Active-High Logic Input. Enable/disable the reverse boost converter.

DN

ENBST

GND

Analog Ground. Short to ground plane.

Output of On-Chip LDO Used to Power On-Chip, Low-Noise Circuits. Bypass with a 2.2µF/10V ceramic

10

V

DD

capacitor to GND. Powering external loads from V

is not recommended other than pullup resistors.

DD

www.maximintegrated.com

Maxim Integrated | 9

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Thermistor Connection. Connect an external negative temperature coefficient (NTC) thermistor from

THM to GND. Connect a resistor equal to the thermistor +25°C resistance from THM to PVL.

11

12

THM

Fast-Charge Current Setting Pin. Connect a resistor (RIFAST) from IFAST to GND to program the fast

charge current. Use 24.9kΩ for 3.15A fast charge current. See the Application Information section.

Battery Power Connection. Connect to the positive terminal of a single-cell (or parallel cell) Li-ion battery.

Bypass BATT to PGND ground plane with a 10µF ceramic capacitor.

IFAST

13, 14

15, 16

17

BATT

SYS

System Power Node. Bypass SYS to PGND with a 2x10µF/10V ceramic capacitor.

Output of On-Chip LDO, Noisy Rail due to Bootstrap Operation. Bypass with a 2.2µF/10V ceramic

capacitor to PGND. Powering external loads from PVL is not recommended.

PVL

18, 19

PGND

Power Ground. Connect the return of the buck output capacitor close to these pins.

Switching Node. Connect an inductor between LX and SYS. When the buck converter is enabled, LX

switches between BYP and PGND to control the input current, battery current, battery voltage, and die

temperature.

20, 21

LX

System Power Connection. Output of OVP adapter input block and input to switching charger. Bypass

with a 22µF/16V ceramic capacitor from BYP to PGND.

22

BYP

Charger Input. Up to 13.7V operating, 16VDC withstand input pin connected to an adapter or USB power

source. Connect a 2.2µF/16V ceramic capacitor from CHGIN to GND.

23, 24

CHGIN

Functional Diagram

SYS

1kΩ

INOKB

CHGIN

BYP

BST

10µF+

22µF

CHARGER INPUT

SENSE AND CONTROL

2

MAX77757

V_BUS

2.2µF

PVL

V_DD

0.1µF

BIAS AND REF

2.2µF

LX

2

DN

DP

CC2

CC1

SYS

BC1.2,

USB TYPE-C CC

DETECTION

CHARGER SW

CONTROL,

REVERSE BOOST

PGND

SYS

2x10µF

2

PVL

THM

SYS

BATT

2

ENBST

1kΩ

SWITCH

STAT

IFAST

+

10µF

T

THERMISTOR

24.9kΩ

GND

BATTERY

PACK

Detailed Description

The MAX77757 is a highly integrated USB Type-C Charger with autonomous configuration. The MAX77757 can operate

from an input range of 4.5V to 13.7V to support 5V, 9V, and 12V AC adapters as well as USB input. The fast-charge

current is up to 3.15A and the max input current limit is 3.0A.

www.maximintegrated.com

Maxim Integrated | 10

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

The MAX77757 can run BC1.2 and USB Type-C CC detection upon input insertion and configure input source to max

power option and charger input current limit to max power.

Fast-charge current and top-off current threshold can be programmed with an external resistor. The input voltage

regulation feature (AICL) even allows users to use weak AC adapters without preventing a charge.

The power path design provides system power even when the battery is fully discharged, and it supplements current from

the battery and charge input automatically when the system demands a higher current.

A reverse boost from the battery can be enabled by the ENBST pin to allow 5.1V/1.5A OTG to V

.

BUS

Switching Mode Charger

Features

•

Complete Li+/LiPoly/LiFePO₄Battery Charger

• Prequalification, Constant Current, Constant Voltage

• 55mA Precharge Current

• 300mA Trickle Charge Current for Charge Termination Voltage from 4.1V to 4.5V. For the 3.6V/3.7V Termination

Voltage Options, Trickle Charge Current is Disabled

• Resistor Adjustable Constant Current Charge

o 500mA to 3.15A

• Resistor Adjustable Charge Termination Threshold

o 50mA to 150mA

• Battery Regulation Voltage

o 3.60V, 4.20V, 4.35V, and 4.40V

o -0.9/+0.3% Accuracy at +25°C

o -1/+0.5% Accuracy from 0°C to +85°C

•

Synchronous Switch-Mode Based Design

Smart Power Selector

• Optimally Distributes Power Between the Charge Adapter, System, and Main Battery

• When Powered by a Charge Adapter, the Main Battery can Provide Supplemental Current to the System

• The Charge Adapter can Support the System without the Main Battery

•

No External MOSFETs Required

Single Input Operation

• Reverse Leakage Protection (Prevents the Battery from Leaking Current to the Inputs)

• V

= 13.7V

CHGIN_OVLO

• Supports AC-to-DC Wall Adapters

• Automatic Input Current Limit Selection After Charger Type Detection

o 500mA, 1A, 2A, 2.5A, and 3A

•

Charge Safety Timer

• 6 Hours

Die Temperature Monitor with Thermal Foldback Loop

• Die Temperature Thresholds: 130°C

•

Input Voltage Regulation Allows Operation from High-Impedance Sources (AICL)

BATT to SYS Switch is 20mΩ Typical

• Capable of 4.5A Steady-State Operation from BATT to SYS

•

Short Circuit Protection

• BATT to SYS Overcurrent Threshold: 6A

• SYS Short-to-Ground

o Buck Operates with Input Current Limit to 200mA when V_SYS< V_SYSPU

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Maxim Integrated | 11

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

V

/V

CHGIN

USB ADP

Q

CHGIN

BYP

BST

CHGIN

BYP

5.1V

UP TO +13.7V OPERATING

UP TO 3.0A INPUT CURRENT

(REVERSE BOOST MODE)

Q

HS

CHGIN INPUT CURRENT

LIMIT SWITCH

LX

BUCK/BOOST

CONTROLLER

SYS

Q

LS

PGND

SYS

Q

BAT

CHARGE AND

SMART POWER

MAX77757

PATH CONTROLLER

UP TO 3.15A

CHARGE CURRENT

BATT

+

Figure 1. Simplified Functional Diagram

www.maximintegrated.com

Maxim Integrated | 12

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

MAX77757

R

INSD

Q

CHGIN

V

BYP

CHGIN

BYP

V

/V

USB ADP

22µF

16V

0603

10µF

16V

0603

2.2µF

16V

0603

UP TO +13.7V OPERATING

UP TO 3.0A INPUT CURRENT

V

CHGIN

INPUT CONTROL

WATCHDOG

CHARGE

TIMER

BST

HS

0.1µF

6.3V

1.3MHz

0402

Q

BUCK CONTROLLER

0.47µH

LX

DRV_OUT

CHARGE CONTROLLER

Q

LS

REVERSE BOOST

CONTROLLER

PGND

JUNCTION

TEMPERATURE

SENSOR TEMP

SYS

T

J

V

SYS

2x10µF

10V

0603

Q

BAT

V

IBATT

BATT

10µF

10V

0603

UP TO 3.15A OF

CHARGE

CURRENT AND

UP TO 6A OF

DISCHARGE

CURRENT

BATT

GND

+

V

MBATT

Figure 2. Main Battery Charger Detailed Functional Diagram

Detailed Description

The MAX77757 is a switch-mode charger for a one-cell lithium-ion (Li+), lithium polymer (Li-polymer), or LiFePO₄battery.

The current limit for CHGIN input is configured automatically allowing the flexibility to connect to either an AC-to-DC wall

charger or a USB port, as shown in Figure 2.

The synchronous switch-mode DC-DC converter utilizes a high 1.3MHz switching frequency, which is ideal for portable

devices since it allows the use of small components while eliminating excessive heat generation. The DC-DC converter

has both a buck and a boost mode of operation. When charging, the main battery converter operates in buck mode. The

DC-DC buck operates from a 4.3V to 13.7V source and delivers up to 3.15A to the battery. The battery charge current is

programmable from 500mA to 3.15A with an external resistor.

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Maxim Integrated | 13

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

As a boost converter, the DC-DC uses energy from the main battery to boost the voltage at BYP. The boosted BYP

voltage is used to supply the USB OTG voltage which is fixed to 5.1V.

Maxim Integrated’s Smart Power Selector architecture makes the best use of the limited adapter power and the battery’s

power at all times to supply up to buck current limit from the buck to the system. (Additionally, supplement mode provides

additional current from the battery to the system up to B2SOVRC.) Adapter power that is not used for the system is used

to charge the battery. All power switches for charging and switching the system load between the battery and adapter

power are included on-chip—no external MOSFETs are required.

Maxim Integrated’s proprietary process technology allows for low-RDSON devices in a small solution size. The total

dropout resistance from the adapter power input to the battery is 165mΩ (typ), assuming that the inductor has 0.04Ω of

ESR. This 165mΩ typical dropout resistance allows for charging a battery up to 3.0A from a 5V supply. The resistance

from the BATT-to-SYS node is 20mΩ, allowing for low power dissipation and long battery life.

A multitude of safety features ensures reliable charging. Features include a charge timer, junction thermal regulation,

over/undervoltage protection, and short circuit protection.

The BATT-to-SYS switch has overcurrent protection (see the Main Battery Overcurrent Protection During System Power-

Up section for more information).

Smart Power Selector (SPS)

The SPS architecture is a network of internal switches and control loops that distribute energy between external power

sources CHGIN, BYP, SYS, and BATT.

Figure 1 shows a simplified arrangement for the smart power selector’s power steering switches. Figure 2 shows a more

detailed arrangement of the smart power selector switches with the following names: Q

, Q , Q , and Q .

CHGIN HS LS BAT

Switch and Control Loop Descriptions

•

CHGIN Input Switch: Q

provides the input overvoltage protection of +16V. The input switch is either completely

CHGIN

on or completely off. As shown in Figure 2, there are SPS control loops that monitor the current through the input

switches as well as the input voltage.

DC-DC Switches: Q and Q are the DC-DC switches that can operate as a buck (step-down) or a boost (step-up).

HS LS

When operating as a buck, energy is moved from BYP to SYS. When operating as a boost, energy is moved from

SYS to BYP. SPS control loops monitor the DC-DC switch current, the SYS voltage, and the BYP voltage.

Battery-to-System Switch: Q

BAT

to be isolated from the system (SYS). An SPS control loop monitors the Q

controls the battery charging and discharging. Additionally, Q

allows the battery

BAT

current.

BAT

SYS Regulation Voltage

•

When DC-DC is enabled as a buck and the charger is enabled but in a non-charging state such as done, thermal

shutdown, or timer fault, V is regulated to V and Q is off.

SYS

BATTREG

BAT

•

When the DC-DC is enabled as a buck and charging in trickle-charge, fast-charge, or top-off modes, V

is regulated

SYS

to V

when the V

< V

. And, when the DC-DC is enabled as a buck and charging in

SYSMIN

precharge mode (V

PRECHG

< V

BATT

), V

SYSMIN

is regulated to V

. In these modes, the Q

BATTREG

switch acts as a

= V

SYS BATT +

BATT

PRECHG

SYS

BAT

, then V

linear regulator and dissipates power (P = (V

- V

) × I

). When V

> V

SYS

BATT

SYSMIN

I

× R . In this mode, the Q

BAT2SYS BAT

switch is closed.

BATT

In all of the previous modes, if the combined SYS load exceeds the input current limit, then V

drops to V

–

BATT

SYS

V

, and the battery provides supplemental current.

BSREG

Input Validation

The charger input is compared with several voltage thresholds to determine if it is valid. A charger input must meet the

following three characteristics to be valid:

•

CHGIN must be above V

to be valid. Once CHGIN is above the UVLO threshold, the information (together

CHGIN_UVLO

with LIN2SYS, described as follows) is latched and only can be reset when the charger is in adaptive input current

loop (AICL) and input current is lower than the IULO threshold of 60mA. Note that V

is lower than their

CHGIN_REG

UVLO falling threshold, respectively.

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Maxim Integrated | 14

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

•

CHGIN must be below its overvoltage lockout threshold (V

).

CHGIN_OVLO

.

CHGIN must be above the system voltage by V

CHGIN2SYS

V_{CHGI N}

INPUT I S NOT

OVERVO LTAGE

V_{CHGI N_OVL OB}

USB_CHGR_EN

V_{CHGI N_VLD}

S

R

Q

INPUT I S NOT

UNDER VO LTAGE

V_{CHGI N_UVLO B}

LIN2SYS

AICL

V_{CHGI NUVLO}

LO W IN PU T TO SYS

HEADRO OM

V_SYS+ OFFSET

ADAPTIVE INPUT

CURR ENT LOO P

V_{CHGI N_REG}

I_IULO

INPUT CU RRENT

LO W

IULO

I_{CHGI N2BYP}

Figure 3. CHGIN Valid Signal Generation Logic

INOKB pin is pulled down when CHGINOK = 1 and the switcher starts.

V

CHGIN_VLD

INOKB

SWITCHER START

Figure 4. INOKB Signal Generation Logic

Input Current Limit

After the charger type detection is complete, the MAX77757 automatically configures the input current limit to the highest

setting that the source can provide. If the input source is not a standard power source described by BC1.2, USB Type-C,

or a proprietary charger type that the MAX77757 can detect, the MAX77757 sets the input current limit to 3A.

Input Voltage Regulation Loop

An input voltage regulation loop allows the charger to function well when it is attached to a poor-quality charge source.

The loop improves performance with relatively high resistance charge sources that exist when long cables are used or

devices are charged with non-compliant USB hub configurations.

The input voltage regulation loop automatically reduces the input current limit in order to keep the input voltage at

V

. If the input current limit is reduced to I

, then the charger input is turned off.

(50mA, typ) and the input voltage is below

CHGIN_REG

CHGIN_REG_OFF

Input Self-Discharge

To ensure that a rapid removal and reinsertion of a charge source always results in a charger input interrupt, the charger

input presents loading to the input capacitor to ensure that when the charge source is removed the input voltage decays

below the UVLO threshold in a reasonable time (t

). The input self-discharge is implemented with a 44kΩ resistor

INSD

(R ) from CHGIN input to ground.

INSD

www.maximintegrated.com

Maxim Integrated | 15

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Charger States

Li+/Li-Poly Battery

The MAX77757 utilizes several charging states to safely and quickly charge Li+/Li-Poly batteries as shown in Figure 5

and Figure 6. Figure 5 shows an exaggerated view of the Li+/Li-Poly battery progressing through the following charge

states when there is no system load and the die and battery are close to room temperature: precharge ➔ trickle ➔ fast-

charge ➔ top-off ➔ done.

NOT TO SCALE, V_CHGIN= 5.0V, I_SYS= 0A, T_J= +25°C

V_BATTREG

V_RSTRT

V_TRICKLE

V_PRECHG

0V

TIME

I_CHG≤ I_SET

I_TRICKLE

I_TO

0A

I_PRECHG

TIME

CHARGER

ENABLED

Figure 5. Li+/Li-Poly Charge Profile

www.maximintegrated.com

Maxim Integrated | 16

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

INIT

INPUT IS VALID

INKOB = Hi-Z OR STAT = Hi-Z

I_CHG= 0

CHG TIMER = 0

INPUT IS INVALID

BUCK

INKOB = LOW OR STAT = Hi-Z

SWITCHER = BUCK MODE

Q_BAT= OFF UNLESS SUPPLEMENT

V_THM> V_{CHGR_EN}THRESHOLD

AND T_J< T_SHDN

V_PRECHG≤ V_BATT

and PQEN = 0

(SOFT-START)

PRECHARGE

INOKB = LOW AND

STAT = BLINK

CHG TIMER ≥ t_PQ

CHG TIMER SUSPEND

I_CHG≤ I_PRRECHG

V_PRECHG≤ V_BATT

(SOFT-START)

V_BATT< V_PRECHG

(SOFT-START)

CHG TIMER ≥ t_PQ

CHG TIMER SUSPEND

TRICKLE CHARGE

INOKB = LOW AND

STAT = BLINK

I_CHG≤ I_TRICKLE

TIMER FAULT

INOKB = LOW AND STAT = Hi-Z

V_BATT< V_TRICKLE

AND

V_PRECHG≤ V_BATT

I_CHG= 0

V_TRICKLE≤ V_BATT

(SOFT-START)

V_BATT< V_RECHG

(SOFT-START)

CHG TIMER ≥ t_FC

CHG TIMER SUSPEND

V_THM< V_{CHGR_EN}THRESHOLD

OR T_J> T_SHDN

CHG TIMER SUSPEND

INPUT IS INVALID

CHG TIMER SUSPEND

FAST CHARGE (CC)

INOKB = LOW AND

STAT = BLINK

I_CHG≤ I_FC

V_BATTREG≤ V_BATT

I

< I_CHG

FC

CHG TIMER ≥ t_FC

CHG TIMER SUSPEND

FAST CHARGE (CV)

INOKB = LOW AND

STAT = BLINK

ANY STATE*

I_TO< I_CHG≤ I_FC

* EXCEPT INIT AND BUCK STATES

I_CHG≤ I_TOFOR t_TERM

TOP OFF

INOKB = LOW AND

STAT = LOW

I_CHG≤ I_TO

V_BATT< (V_BATTREG– V_RSTRT

(NO SOFT-START)

)

CHG TIMER ≥ t_TO

CHG TIMER SUSPEND

CHARGER STATE WHERE THE CHARGE IS DISABLED

(BATTERY CHARGE STOPPED)

CHARGER STATE WHERE THE CHARGE IS ENABLED

(BATTERY CHARGE ON-GOING)

DONE

INOKB = LOW AND

STAT = LOW

I_CHG= 0

V_BATT< V_PQLB

CONDITION NEEDED TO TRANSITION BETWEEN TWO CHARGER STATES

CHG TIMER = 0

CHG TIMER

V_BATT< (V_BATTREG– V_RSTRT

)

CHG TIMER RESUME

TRANSITION BETWEEN TWO CHARGER STATES

Figure 6. Li+/Li-Poly Charger State Diagram

www.maximintegrated.com

Maxim Integrated | 17

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

LiFePO₄Battery

As for the LiFePO₄battery, the MAX77757 skips the trickle charge state and directly enters the fast-charge state after the

precharge state. Figure 7 and Figure 8 presents the LiFePO₄battery charge profile and state machine: precharge ➔

trickle ➔ fast-charge ➔ top-off ➔ done.

NOT TO SCALE, V_CHGIN= 5.0V, V_BATTREG=3.6V, I_SYS= 0A, T_J= +25°C

V_BATTREG

V_RSTRT

V_PRECHG

0V

TIME

I_CHG≤ I_SET

I_TO

I_PRECHG

0A

TIME

CHARGER

ENABLED

Figure 7. LiFePO₄Battery Charge Profile

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Maxim Integrated | 18

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

INIT

INPUT IS VALID

INKOB = Hi-Z OR STAT = Hi-Z

I_CHG= 0

CHG TIMER = 0

INPUT IS INVALID

BUCK

INKOB = LOW OR STAT = Hi-Z

SWITCHER = BUCK MODE

Q_BAT= OFF UNLESS SUPPLEMENT

V_THM> V_{CHGR_EN}THRESHOLD

AND T_J< T_SHDN

V_PRECHG≤ V_BATT

and PQEN = 0

(SOFT-START)

PRECHARGE

INOKB = LOW AND

STAT = BLINK

CHG TIMER ≥ t_PQ

CHG TIMER SUSPEND

I_CHG≤ I_PRRECHG

V_PRECHG≤ V_BATT

(SOFT-START)

V_BATT< V_PRECHG

(SOFT-START)

TIMER FAULT

INOKB = LOW AND STAT = Hi-Z

I_CHG= 0

V_BATT< V_RECHG

(SOFT-START)

CHG TIMER ≥ t_FC

CHG TIMER SUSPEND

V_THM< V_{CHGR_EN}THRESHOLD

OR T_J> T_SHDN

CHG TIMER SUSPEND

INPUT IS INVALID

CHG TIMER SUSPEND

FAST CHARGE (CC)

INOKB = LOW AND

STAT = BLINK

I_CHG≤ I_FC

V_BATTREG≤ V_BATT

I

< I_CHG

FC

CHG TIMER ≥ t_FC

CHG TIMER SUSPEND

FAST CHARGE (CV)

INOKB = LOW AND

STAT = BLINK

ANY STATE*

I_TO< I_CHG≤ I_FC

* EXCEPT INIT AND BUCK STATES

I_CHG≤ I_TOFOR t_TERM

TOP OFF

INOKB = LOW AND

STAT = LOW

I_CHG≤ I_TO

V_BATT< (V_BATTREG– V_RSTRT

(NO SOFT-START)

)

CHG TIMER ≥ t_TO

CHG TIMER SUSPEND

CHARGER STATE WHERE THE CHARGE IS DISABLED

(BATTERY CHARGE STOPPED)

CHARGER STATE WHERE THE CHARGE IS ENABLED

(BATTERY CHARGE ON-GOING)

DONE

INOKB = LOW AND

STAT = LOW

I_CHG= 0

V_BATT< V_PQLB

CONDITION NEEDED TO TRANSITION BETWEEN TWO CHARGER STATES

CHG TIMER = 0

CHG TIMER

V_BATT< (V_BATTREG– V_RSTRT

)

CHG TIMER RESUME

TRANSITION BETWEEN TWO CHARGER STATES

Figure 8. LiFePO₄State Machine

INIT State

From any state shown in Figure 6 except thermal shutdown, the “INIT” state is entered whenever the charger inputs

CHGIN is invalid or the charger timer is suspended.

While in the “INIT” state, the charger current is 0mA, the charge timer is forced to 0, and the power to the system is

provided by the battery.

To exit the “INIT” state, the charger input must be valid.

www.maximintegrated.com

Maxim Integrated | 19

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Buck State

In the buck state, battery charging is disabled while the charger input CHGIN is valid. Entering or leaving the buck state

is controlled by the voltage of the THM pin. If the voltage of this pin is pulled down by an external device (e.g., MCU)

under V

, the chip goes to the buck state from any state if CHGIN is valid as shown in Figure 6. Charging is

CHGR_EN

disabled in the buck state, which means Q

is off unless it is in supplement mode. If the voltage of this pin is over

BAT

, the chip leaves the buck state and resumes charging. It should be noted that it is only when CHGIN is valid

V

CHGR_EN

that charging can be enabled or disabled. Therefore, the external device (e.g., MCU) should check the INOKB signal if

CHGIN is valid before trying to enable or disable charging.

Precharge State

As shown in Figure 6, the precharge state occurs when the main battery voltage is less than V

. In the precharge

PRECHG

state, charge current into the battery is I

.

PRECHG

The following events cause the state machine to exit this state:

•

The main battery voltage rises above V

charge.

If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault

and the charger enters the next state in the charging cycle, trickle

PRECHG

PQ

state.

Note that the precharge state works with battery voltages down to 0V. The low 0V operation typically allows this battery

charger to recover batteries that have an “open” internal pack protector. Typically a pack internal protection circuit opens

if the battery has seen an overcurrent, undervoltage, or overvoltage. When a battery with an “open” internal pack protector

is used with this charger, the precharge mode current flows into the 0V battery—this current raises the pack’s terminal

voltage to the point where the internal pack protection switch closes.

Note that a normal battery typically stays in the precharge state for several minutes or less; therefore, a battery that stays

in the precharge state for longer than t

might be experiencing a problem.

PQ

Trickle Charge State

The trickle charge mode descripted below is for Li-ion and Li-poly batteries only, with charge termination voltage from

4.1V to 4.5V.

The trickle charge state occurs when V

> V

and V < V

BATT

, as shown in Figure 6.

TRICKLE

BATT

PRECHG

When the MAX77757 is in its trickle charge state, the charge current in the battery is less than or equal to I

.

TRICKLE

Charge current might be less than I

/I for any of the following reasons:

TRICKLE FC

•

The charger input is under input current limit

The charger input voltage is low

The charger is in thermal foldback

The system load is consuming adapter current. Note that the system load always gets priority over the battery charge

current.

The following events cause the state machine to exit this state:

•

When the main battery voltage rises above V

charge constant current (CC).

, the charger enters the next state in the charging cycle, fast-

TRICKLE

•

If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault

PQ

state.

Note that a normal battery typically stays in the trickle charge state for several minutes or less; therefore, a battery that

stays in trickle charge for longer than t might be experiencing a problem.

PQ

Based on the characteristic of the LiFePO4 battery, the trickle charge state of the MAX77757 3.6V option is disabled.

After the precharge state, when V < V < V , the MAX77757 enters the fast-charge constant current

PRECHG

BATT

BATTREG

state to improve the charger efficiency.

www.maximintegrated.com

Maxim Integrated | 20

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Fast-Charge Constant Current State

As shown in Figure 6, the fast-charge constant current (CC) state occurs when the main-battery voltage is greater than

the trickle threshold and less than the battery regulation threshold (V < V < V ).

TRICKLE

BATT

BATTREG

In the fast-charge CC state, the current into the battery is less than or equal to I . Charge current can be less than I

FC

for any of the following reasons:

•

The charger input is under input current limit

The charger input voltage is low

The charger is in thermal foldback

The system load is consuming adapter current. Note that the system load always gets priority over the battery charge

current.

The following events cause the state machine to exit this state:

•

When the main battery voltage rises above V

charge constant voltage (CV).

, the charger enters the next state in the charging cycle, fast-

BATTREG

•

If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault

FC

state.

The battery charger dissipates the most power in the fast-charge constant current state. This power dissipation causes

the internal die temperature to rise. If the die temperature exceeds T

, I is reduced. See the Thermal Foldback

REG FC

section for more information.

Fast-Charge Constant Voltage State

As shown in Figure 6, the fast-charge constant voltage (CV) state occurs when the battery voltage rises to V

BATTREG

from the fast-charge CC state.

In the fast-charge CV state, the battery charger maintains V

across the battery and the charge current is less

BATTREG

than or equal to I . As shown in Figure 5, charger current decreases exponentially in this state as the battery becomes

FC

fully charged.

The smart power selector control circuitry might reduce the charge current lower than the battery can otherwise consume

for any of the following reasons:

•

The charger input is under input current limit

The charger input voltage is low

The charger is in thermal foldback

The system load is consuming adapter current. Note that the system load always gets priority over the battery charge

current.

The following events cause the state machine to exit this state:

•

When the charger current is below I

for t , the charger enters the next state in the charging cycle, top off.

TERM

TO

If the battery charger remains in this state for longer than t , the charger state machine transitions to the timer fault

FC

state.

Top-Off State

As shown in Figure 6, the top-off state can only be entered from the fast-charge CV state when the charger current

decreases below I

for t

. In the top-off state, the battery charger tries to maintain V

across the battery

TO

and typically the charge current is less than or equal to I

TERM

BATTREG

.

TO

The smart power selector control circuitry might reduce the charge current lower than the battery can otherwise consume

for any of the following reasons:

•

The charger input is under input current limit

The charger input voltage is low

The charger is in thermal foldback

The system load is consuming adapter current. Note that the system load always gets priority over the battery charge

current.

www.maximintegrated.com

Maxim Integrated | 21

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

The following events cause the state machine to exit this state:

•

After being in this state for the top-off time (t ), the charger enters the next state in the charging cycle, done.

TO

If V

< V

– V

BATTREG

, the charger goes back to the fast-charge (CC) state

RSTRT

BATT

Done State

As shown in Figure 6, the battery charger enters the done state after the charger has been in the top-off state for t

.

TO

The following event causes the state machine to exit this state:

•

If V

< V

– V

the charger goes back to the fast-charge (CC) state

RSTRT,

BATT

BATTREG

In the done state, the charge current into the battery (I

) is 0A. In the done state, the charger presents a very low

CHG

quiescent current to the battery. If the system load presented to the battery is low (<100μA), then a typical system can

remain in the done state for many days. If left in the done state long enough, the battery voltage decays below the restart

threshold (V

), and the charger state machine transitions back into the fast-charge CC state. There is no soft-start

RSTRT

(di/dt limiting) during the done-to-fast-charge state transition.

Timer Fault State

The battery charger provides a charge timer to ensure safe charging. As shown in Figure 6, the charge timer prevents

the battery from charging indefinitely. The time that the charger is allowed to remain in each of the prequalification states

is t . The time that the charger is allowed to remain in the fast-charge CC and CV states is t . Finally, the time that the

PQ FC

charger is in the top-off state is t . Upon entering the timer fault state, STAT becomes Hi-Z.

TO

In the timer fault state, the charger is off. The charger input can be removed and re-inserted to exit the timer fault state

(See the “any state” bubble in the lower left of Figure 6).

Thermal Shutdown State

As shown in Figure 6, the thermal shutdown state occurs when the battery charger is in any state and the junction

temperature (T ) exceeds the device’s thermal-shutdown threshold (T

). When T is close to REG, the charger folds

J

SHDN

J

back the input current limit to 0A so that the charger and inputs are effectively off.

In the thermal shutdown state, the charger is off.

Reverse Boost Mode

The DC-DC converter topology of the MAX77757 allows it to operate as a buck converter or as a reverse boost converter.

The modes of the DC-DC converter are controlled by ENBST. When ENBST = high and CHGIN voltage is lower than

0.7V, the DC-DC converter operates in reverse boost mode allowing it to source current to BYP and CHGIN. This mode

is commonly referred to as OTG mode or a source role.

The current through the BYP to CHGIN switch is limited to a 1.5A minimum. When the reverse boost mode is enabled,

the unipolar CHGIN transfer function measures current going out of CHGIN.

The BYP to CHGIN switch automatically retries after 300ms if CHGIN loading exceeds the 1.5A current limit. If the

overload at CHGIN persists, then the CHGIN switch toggles ON and OFF with approximately 60ms ON and 300ms OFF.

Under the reverse boost mode, the CC pins enter the low power source mode until the connection is established. Once

Rd is detected, the MAX77757 enables the 180μA current source of the active CC pin, whereas the other CC pin stays

high impedance.

Main Battery Overcurrent Protection During System Power-Up

The main battery overcurrent protection during system power-up feature limits the main battery to system current to

I

if V

is less than V

. This feature limits the surge current that typically flows from the main battery to the

SYSPU

SYS

device’s low-impedance system bypass capacitors during a system power-up. System power-up occurs anytime that

energy from the battery is supplied to SYS when V < V . This “system power-up” condition typically occurs

SYS

SYSPU

when a battery is hot-inserted into an otherwise unpowered device.

When “system power-up” occurs due to hot-insertion into an otherwise unpowered device, a small delay is required for

this feature’s control circuits to activate. A current spike over I

might occur during this time.

SYSPU

www.maximintegrated.com

Maxim Integrated | 22

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Main Battery Overcurrent Protection Due To Fault

The MAX77757 protects itself, the battery, and the system from potential damage due to excessive battery discharge

current. Excessive battery discharge current can occur for several reasons such as exposure to moisture, a software

problem, an IC failure, a component failure, or a mechanical failure that causes a short circuit.

When the main battery (BATT)-to-system (SYS) discharge current (I

) exceeds 6A for at least t

BATT

, then the

BOVRC

MAX77757 disables the BATT-to-SYS discharge path (Q

switch) and turns off the buck. Under OCP fault condition,

BAT

) for tocp_retry, the MAX77757 restarts on its own and attempts to pull up SYS again.

when SYS is low (V

< V

SYSUP

SYS

If the fault condition remains, the whole cycle repeats until this fault condition is removed.

Thermal Management

The MAX77757 charger uses several thermal management techniques to prevent excessive battery and die

temperatures.

Thermal Foldback

Thermal foldback maximizes the battery charge current while regulating the MAX77757 junction temperature. As shown

in Figure 9, when the die temperature exceeds the REGTEMP (T

), a thermal limiting circuit reduces the battery

REG

charger’s target current by 5% of the fast-charge current per 1°C (A

), which corresponds to 157.5mA/°C when the

TJREG

fast-charge current is 3.15A. For lower programmed charge currents such as 480mA, this slope is valid for charge current

reductions down to 80mA; below 100mA, the slope becomes shallower but the charge current reduces to 0A if the junction

temperature is 20°C above the programmed loop set point. The target charge current reduction is achieved with an analog

control loop (i.e., not a digital reduction in the input current).

DRAWN TO SCALE, V_CHGIN= 5.0V, V_SYS= 0A, CHGIN INPUT CURRENT LIMIT IS SET FOR MAXIMUM

I_FC= 3.15A

3.0A

A_TJREG= -5%/°C

2.0A

1.0A

0.0A

T_JREG+ 20°C

T_JREG

JUNCTION TEMPERATURE (°C)

Figure 9. Charge Currents vs. Junction Temperature

www.maximintegrated.com

Maxim Integrated | 23

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Thermistor Input (THM)

The thermistor input can be utilized to achieve functions that include charge suspension, JEITA-compliant charging, and

disabling the charger.

The charger can be disabled by pulling the THM pin to ground. Figure 11 shows a recommended system diagram where

the MCU has a GPIO output connected to THM to enable or disable charging, and a GPIO input connected to INOKB to

check the presence of a valid charger. Note that the GPIO output should be an open-drain type.

JEITA Compliance

The MAX77757J version safely charges batteries in accordance with JEITA specifications. The MAX77757J version

monitors the battery temperature with an NTC thermistor connected at the THM pin and automatically adjusts the fast-

charge current or charge termination voltage as the battery temperature varies.

The JEITA controlled fast-charge current is reduced to 50% of the detected fast charge current for T

< T < T .

COOL

COLD

The charge termination voltage for T

< T < T

HOT

is reduced to programmed termination voltage -150mV, as shown

WARM

in Figure 10. Charging is suspended when the battery temperature is too cold or too hot (T < T

or T

HOT

< T).

COLD

The MAX77757H version disables the JEITA under warm and cool conditions and stops charging when the temperature

is too hot or cold. See the Ordering Information for details.

Temperature thresholds (T

, T

, and T ) depend on the thermistor selection. See the Thermistor

HOT

COLD COOL WARM

Input (THM) section for more details.

Since the thermistor monitoring circuit employs an external bias resistor from THM to PVL, the thermistor is not limited

only to 10kΩ (at +25ºC); any resistance thermistor can be used if the value is equivalent to the thermistors +25ºC

resistance. The thermistor installed on the evaluation kit is 10kΩ with a beta of 3435.

The general relation of thermistor resistance to temperature is defined by the following equation:

1

−

)]

푅_푇= 푅₂₅× 푒^[훽×(

푇+273 298

where

R = The resistance in Ω of the thermistor at temperature T in Celsius

T

R

25

= The resistance in Ω of the thermistor at +25ºC

β = The material constant of the thermistor, which typically ranges from 3000k to 5000k

T = The temperature of the thermistor in Celsius

www.maximintegrated.com

Maxim Integrated | 24

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

ICHGCC_NORMAL

ICHGCC_COOL

TEMPERATURE

T_COLD

T_COOL

T_WARM

T_HOT

VCHGCV_NORMAL

CHGCV_PRM-150mV/cell

TEMPERATURE

T_COLD

T_COOL

T_WARM

T_HOT

Figure 10. MAX77757J Version JEITA Compliance

www.maximintegrated.com

Maxim Integrated | 25

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

ICHGCC_NORMAL

TEMPERATURE

T_COLD

T_COOL

T_WARM

T_HOT

VCHGCV_NORMAL

TEMPERATURE

T_COLD

T_COOL

T_WARM

T_HOT

Figure 11. MAX77757H Version Hot/Cold Stop

V

DD

Internal Supply

V

is the 1.8V power for the MAX77757 charger’s analog circuit. V

chooses the higher value between the BATT and

DD

has a bypass capacitance of 2.2µF.

CHGIN as power input source. V

DD

ENBST For Reverse Boost

ENBST is an input control signal for the reverse boost mode with an external logic signal. If ENBST is driven high, the

reverse boost is enabled and the BYP to CHGIN path is closed. It has an internal 235kΩ pulldown resistor. When ENBST

sets high, the MAX77757 disconnects Rd from the CC line and provides 180μA current source.

www.maximintegrated.com

Maxim Integrated | 26

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

USB BC1.2 Charger Detection

Features

•

D+/D- Charging Signature Detector

USB BC1.2 Compliant

SDP, DCP, and CDP Detection

Detect Proprietary Charger Types

®

• Apple 500mA, 1A, 2A, 12W

®

• Samsung 2A

Description

The USB charger detection is USB BC1.2 compliant with the ability to automatically detect some common proprietary

charger types.

The Charger Detection State Machine follows USB BC1.2 requirements and detects SDP, CDP, and DCP types. The

Charger Detection State Machine indicates if D+/D- were found as open but ChgTyp indicates SDP as required by BC1.2

specifications.

In addition to the USB BC1.2 State Machine, the IC also detects a limited number of proprietary charger types (Apple,

Samsung, and generic 500mA). The UIC automatically sets the CHGIN input current limiting based on the charger type

detection results. If the charger type detection results are from an unknown charger type or data contact detection timed

out, the input current limits are set to a maximum of 3A.

Table 1. BC1.2 Charger Type

USB BC1.2 DETECTED CHARGER TYPE

INPUT CURRENT LIMIT

CHARGER DETECTED

500mA

1.5A

The default setting before charger detection

SDP

CDP

DCP

1.5A

Table 2. Proprietary Charger Type

DETECTED PROPRIETARY CHARGER TYPE

INPUT CURRENT LIMIT

CHARGER DETECTED

500mA

1A

Apple

2A

Apple

2.4A

2A

Apple

Samsung

All others

3A

www.maximintegrated.com

Maxim Integrated | 27

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

USB Type-C CC Detection

Features

•

USB Type-C sink support

CC source detection and automatically set the input current limit according to source capability

Source role is supported by ENBST pin

CC Description

The MAX77757 works as a sink compliant to USB Type-C rev1.2. The USB Type-C functions are controlled by a

logic state machine that follows the USB Type-C requirements. The MAX77757 sets the CHGIN input current limit

based on the current advertised on the CC wires. Source role is enabled by the ENBST pin. When source role is

enabled, Rd is removed and a 180μA current source is connected.

Detecting Connected Source

When a source is detected, the USB Type-C state machine auto-detects the active CC line. The state machine also auto-

detects the source advertised current (500mA, 1.5A, and 3.0A). Upon detection of a change in advertised current, the

MAX77757 automatically sets the input current limit.

Enable Source Role

ENBST = high enables the MAX77757's source role. The MAX77757 disconnects Rd from the CC line and connects a

180μA current source to advertise a 5V/1.5A power source. The MAX77757 enables the reverse boost and supplies

5.1V/1.5A through the CHGIN pin.

www.maximintegrated.com

Maxim Integrated | 28

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Applications Information

Fast-Charge Current and Top-Off Current Setting

While a valid input source is present, the battery charger attempts to charge the battery with a fast-charge current

determined by the resistance from IFAST to GND. Top-off current matches to the fast-charge current. Table 3 shows

resistance values which correspond to target IFAST and ITOPOFF values.

Table 3. Fast-Charge Current and Top-Off Current Setting

RESISTANCE (kΩ)

IFAST (mA)

3150

3000

2800

2500

2400

2200

2000

1800

1500

1400

1200

1000

800

ITOPOFF (mA)

24.9

22.6

20.5

18.7

16.9

15.4

14

150

125

100

75

12.4

11

75

9.53

8.2

75

50

6.65

5.23

3.6

50

600

50

2.4

500

50

www.maximintegrated.com

Maxim Integrated | 29

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

D+/D- Multiplexing

USB D+/D- lines, which are used for the detection of BC1.2 and proprietary Travel Adaptors (TAs), can be used for data

communication. If an MCU handles this communication in the target system, the D+/D- lines can be connected to the

MAX77757 and the MCU as show in Figure 12. Switchers are required for each D+ and D- line to guarantee Hi-Z for the

connections to MCU to avoid wrong detections of TAs (see Figure 12). It is recommended to connect the INOKB of the

MAX77757 to the MCU in this configuration so that the MAX77757 can signal the completion of the detection to the MCU.

Once the MCU receives a valid INOKB signal, it can switch the D+/D- lines from the MAX77757 to the MCU for data

communication.

USB TYPE-C

CONNECTOR

CHGIN

CC1

V_BUS

CC1

CC2

D+

CC2

MAX77757

DP

D-

DN

INOKB

GPIO

MCU

D+

D-

Figure 12. D+/D- Connections in a Reference System

Capacitor Selection

All capacitors should be X5R dielectric or better. Be aware that multi-layer ceramic capacitors have large-voltage

coefficients. Before selecting capacitors, check the sufficient voltage rating and derated capacitance at max operating

voltage conditions. Table 5 shows proper capacitors after considering the derating and operating voltage.

Table 4. Capacitor Selections

TYPE

2.2µF/16V

CHGIN Capacitor

BYP Capacitor

SYS Capacitor

BATT Capacitor

10µF + 22µF/16V

2x10µF/10V

10µF/10V

V

Capacitor

2.2µF/10V

DD

PVL Capacitor

BST Capacitor

2.2µF/10V

0.1μF/6.3V

www.maximintegrated.com

Maxim Integrated | 30

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Non-USB Type Power Source

In an application where the power source is not USB, all the USB-related pins such as CC1, CC2, DP, and DN should be

left unconnected. In this case, the input current to MAX77757 is limited to 3A.

Recommended PCB Layout and Routing

Place all bypass capacitors for CHGIN, BYP, SYS, V , and BATT as close as possible to the IC. Provide a large copper

DD

ground plane to allow the PGND pad to sink heat away from the device. Use wide and short traces for high current

connections such as CHGIN, BYP, SYS, and BATT to minimize voltage drops. The MAX77757 has two kinds of ground

pins, PGND and GND. Use caution when connecting PGND since it is the switching node ground of the Charger Buck; it

should be tied to the ground of the SYS and BYP capacitor and connected to the ground plane directly without sharing

the other ground. The GND can be connected to the ground plane.

Figure 13 is a recommended placement and layout guide.

CBYP

INDUCTOR

CBYP

CCH

GIN

RES

CVDD

RES

THERMISTOR

Figure 13. Recommended Placement and Layout

www.maximintegrated.com

Maxim Integrated | 31

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Inductor Selection

The MAX77757's control scheme requires an external inductor from 0.47μH to 1μH for proper operation.

Table 5. Recommended Inductors

INDUCTANCE

I

DCR (TYP)

SIZE (L x W x T)

(mm)

SAT(TYP) RMS(TYP)

MANUFACTURER

PART NUMBER

(μH)

(A)

5.5

6

(A)

4.5

5

(mΩ)

SEMCO

CYNTEC

CIGT252008LMR47MNE

CIGT252010LMR47MNE

CIGT201610EHR47MNE

HTEH25201T-R47MSR-63

0.47

24

2.5 x 2.0 x 0.8

2.5 x 2.0 x 1.0

2.0 x 1.6 x 1.0

2.5 x 2.0 x 1.0

5.9

6.6

18

5.6

16.5

Charger Status Outputs

Input Status (INOKB)

INOKB is an open-drain and active-low output that indicates input status. If a valid input source is inserted and the buck

converter starts switching, INOKB pulls low. When the reverse boost is enabled, INOKB pulls low to indicate 5V output

from CHGIN.

INOKB can be used as a logic output for the system processor by adding a 200kΩ pullup resistor to the system I/O

voltage.

INOKB can also be used as a LED indicator driver by adding a current limit resistor and a LED to SYS.

Charging Status Output (STAT)

STAT is an open-drain and active-low output that indicates charge status. STAT status changes as shown in Table 6.

Table 6. STAT Output Per Charging Status

CHARGING STATUS

STAT

High impedance

LOGIC STATE

CHARGE STATUS LED

No input

High

Off

Trickle, precharge, fast

charge

Repeat low and high impedance

with 1Hz, 50% duty cycle

After an external diode and a

capacitor rectifier, high

Blinking with 1Hz, 50% duty

cycle

Top-off and done

Faults

Low

Solid on

Off

High impedance

High

STAT can be used as a logic output for the system processor by adding a 200kΩ pullup resistor to the system I/O voltage

and a rectifier (a diode and a capacitor).

STAT also can be used as a LED indicator driver by adding a current limit resistor and a LED to SYS.

www.maximintegrated.com

Maxim Integrated | 32

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Typical Application Circuit

USB TYPE-C

CONNECTOR

4.5V TO 13.7V/3A

23

24

22

CHGIN

BYP

V_BUS

10µF+

22µF

2.2µF

CHGIN

CC2

4

CC2

CC1

D+

1

5

BST

CC1

DP

0.1µF

6

7

20

LX

21

LX

0.47µH

DN

D-

15

V_SYS

SYS

16

MAX77757

SYS

MAX4906

2x

10µF

17

PVL

2.2µF

V_PVL

1kΩ

18

19

PGND

3

STAT

2

INOKB

IFAST

11

12

THM

BATTERY PACK

THERMISTOR

3.15A

13

14

BATT

24.9kΩ

10µF

T

10

9

D- D+

V_DD

2.2µF

8

GND

ENBST

MCU

GPIO

THM

(OPEN-DRAIN

OUTPUT)

Figure 14. Typical Application Circuit

Ordering Information

BATTERY

TERMINATION

VOLTAGE (V)

BATTERY

CHEMISTRY

PART NUMBER

TEMP RANGE

PIN-PACKAGE

THM

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

MAX77757JEFG420+

MAX77757JEFG420+T

MAX77757JEFG430+*

MAX77757JEFG430+T*

MAX77757JEFG435+

MAX77757JEFG435+T

MAX77757JEFG440+

MAX77757JEFG440+T

-40°C to +85°C

JEITA

4.20

4.30

4.35

4.40

www.maximintegrated.com

Maxim Integrated | 33

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

BATTERY

CHEMISTRY

PART NUMBER

TEMP RANGE

PIN-PACKAGE

THM

TERMINATION

VOLTAGE (V)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

24 FC2QFN

(3mm x 3mm)

Li-ion

Li-polymer

Li-ion

MAX77757JEFG450+*

MAX77757JEFG450+T*

MAX77757HEFG360+

MAX77757HEFG360+T

MAX77757HEFG370+*

MAX77757HEFG370+T*

MAX77757HEFG420+*

MAX77757HEFG420+T*

MAX77757HEFG430+*

MAX77757HEFG430+T*

MAX77757HEFG435+*

MAX77757HEFG435+T*

MAX77757HEFG440+*

MAX77757HEFG440+T*

MAX77757HEFG450+*

MAX77757HEFG450+T*

-40°C to +85°C

JEITA

4.50

3.60

3.70

4.20

4.30

4.35

4.40

4.50

JEITA

Li-polymer

HOT/COLD STOP

LiFePO4

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

Li-ion

Li-polymer

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*Future product—contact factory for availability.

www.maximintegrated.com

Maxim Integrated | 34

MAX77757

3.15A USB Type-C Autonomous Charger with

JEITA for 1-Cell Li-ion/LiFePO4 Batteries

Revision History

REVISION

NUMBER

REVISION

DATE

PAGES

CHANGED

DESCRIPTION

0

1

3/21

Initial release

Updated Ordering Information table

—

33, 34

USB Type-C is a registered trademark of USB Implementers Forum.

Smart Power Selector is a trademark of Maxim Integrated Products, Inc.

Apple is a registered trademark of Apple Inc.

Samsung is a registered trademark of Samsung Electronics Co., Ltd.

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

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 specifications 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.


型号：	MAX77757
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	3.15A USB Type-C Autonomous Charger with JEITA for 1-Cell Li-ion/LiFePO4 Batteries
文件：	总35页 (文件大小：715K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX77757 [MAXIM]

相关型号：

MAX77757HEFG360+

MAX77757HEFG370+

MAX77757HEFG420+

MAX77757HEFG430+

MAX77757HEFG435+

MAX77757HEFG440+

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