BC3770 datasheet(17/45 Pages) FREESCALE

17 / 45 page

Analog Integrated Circuit Device Data



Freescale Semiconductor

BC3770

Figure 5. Typical Charging Profile in No Fault Condition

BATREG and VSYS

VBATREG

4.1V -4.475V, 25mV steps, 4.2V Default

VSYS_MIN

3.6V

VTRICKLE

2.5V

VSYS

VBATSNSP

Trickle Charge Mode

Pre-Charge

(Constant Current)

Mode

Fast Charge

(Constant Current)Mode

Top-OFF

Mode

Done Mode

(Charger Disabled by

Top-Off timer expired)

ITRICKLE

90mA

Soft-Start=2ms

IPRECHG

150-450mA,

100mA steps,

450mA Default

IFAST CHG

Input & Charge Current

IBAT

100-2000mA,

500mA Default

ITOPOFF

100-650mA, 50mA steps,

100mA Default

IBAT=0mA

INTB

Read

& clear

Full-Charge

(Constant Voltage)

Mode

Read

& clear

Note 1: INT1 for Top-Off Interrupt, INT2 for Done Interrupt, INT3 for Recharge Interrupt

Note 2: The time of Read &Clear depends on the processor.

Note 3: Each deglitch time is not included.

Note 4; Charger restart condition is made on purpose to show the behavior.

IIN_LIM

100-2050mA,

500mA Default

0mA

IFAST_CHG x RDSON_Q4

INT1

INT2

tPRECHG_TMR

45min

reset

tFAST_TMR

Fast charge timer if enabled,

programmable

reset

tTOPOFF_TMR

VRCH

> tBAT RECHG

Read

& clear

INT3

Recharge-

Mode

2.0V

System I/O

available

reset

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