MAX77751 datasheet(23/40 Pages) MAXIM

23 / 40 page

MAX77751

3.15A USB-C Autonomous Charger

for 1-Cell Li+ Batteries

www.maximintegrated.com

Maxim Integrated | 23

VTRICKLE VBATT

(SOFT START)

VBATT < VTRICKLE

AND

VPRECHG VBATT

ICHG ITO FOR tTERM

CHG TIMER tTO

CHG TIMER SUSPEND

DONE

INOKB = LOW AND

STAT = LOW

ICHG = 0

TIMER FAULT

INOKB = LOW AND STAT = HI-Z

ICHG = 0

CHG TIMER tPQ

CHG TIMER SUSPEND

CHG TIMER tFC

CHG TIMER SUSPEND

VBATTREG VBATT

IFC < ICHG

CHG TIMER tFC

CHG TIMER SUSPEND

VBATT < (VBATTREG – VRSTRT)

(NO SOFT START)

INPUT IS INVALID

CHG TIMER SUSPEND

VBATT < (VBATTREG – VRSTRT)

CHG TIMER RESUME

VBATT < VPRECHG

(SOFT START)

INIT

INKOB = HI-Z OR STAT = HI-Z

ICHG = 0

CHG TIMER = 0

TRICKLE CHARGE

INOKB = LOW AND

STAT = BLINK

ICHG ITRICKLE

FAST CHARGE (CC)

INOKB = LOW AND

STAT = BLINK

ICHG IFC

FAST CHARGE (CV)

INOKB = LOW AND

STAT = BLINK

ITO < ICHG IFC

CHARGER STATE WHERE THE CHARGE IS DISABLED

(BATTERY CHARGE STOPPED)

CHARGER STATE WHERE THE CHARGE IS ENABLED

(BATTERY CHARGE ON-GOING)

CHG TIMER = 0

CHG TIMER

TRANSITION BETWEEN TWO CHARGER STATES

VBATT < VPQLB

CONDITION NEEDED TO TRANSITION BETWEEN TWO CHARGER STATES

VPRECHG VBATT

(SOFT START)

VBATT < VRECHG

(SOFT START)

VPRECHG VBATT

and PQEN = 0

(SOFT START)

CHG TIMER tPQ

CHG TIMER SUSPEND

PRECHARGE

INOKB = LOW AND

STAT = BLINK

ICHG IPRRECHG

TOP OFF

INOKB = LOW AND

STAT = LOW

ICHG ITO

BUCK

INKOB = LOW OR STAT = HI-Z

SWITCHER = BUCK MODE

QBAT = OFF UNLESS SUPPLEMENT

INPUT IS VALID

INPUT IS INVALID

VITOPOFF > VCHGR_EN

AND TJ < TSHDN

ANY CHARGING STATE

VITOPOFF < VCHGR_EN

OR TJ > TSHDN

CHG TIMER SUSPEND

Figure 6. Charger State Diagram

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