MAX77751 datasheet(16/40 Pages) MAXIM

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MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

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13, 14

BATT

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.

15, 16

SYS

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

PVL

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.

18, 19

PGND

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

20, 21

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.

BYP

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

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

23, 24

CHGIN

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.

Functional Diagram

CHARGER INPUT S ENSE

AND CONTROL

BIAS AND REF

BC1.2,

USB TYPE-C CC

DETECTION

CHARGER SW

CONTROL,

REVERSE BOOST

SWITCH

MCU

(OPTIONAL)

SYS

CC2

CC1

VBUS

INOKB

CHGIN

PVL

VDD

ENBST

STAT

IFAST

ITOPOFF

BYP

BST

PGND

SYS

BATT

SYS

10µF+

22µF

0.1µF

2x10µF/10V

BATTERY

PACK

10µF

1kΩ

2.2µF

1kΩ

24.3kΩ

24.9kΩ

GND

MAX77751

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