BC3770 Datasheet, PDF (17/45 Pages) Freescale Semiconductor, Inc – 2.0 A Switch-Mode Charger

BATREG and VSYS
VBATREG
4.1V -4.475V, 25mV steps, 4.2V Default
VSYS_MIN
3.6V
I x R FAST_CHG
D SON_ Q4
VSYS
VBATSNSP
VRCH
t ^{> tBAT RECHG}
VTRICKLE
2.5V
2.0V
Trickle Charge Mode
Input & Charge Current
1 0 0 -2 0 50 m A,
IIN_LIM ^{500mA Default}
Pre- Ch ar ge
(Constant Current)
Mode
Fast Charge
(Constant Current)Mode
Full-Charge
(Constant Voltage)
Mode
Top-OFF
Mode
Done Mode
(Charger Disabled by
Top-Off timer expired)
Recharge-
Mode
IFAST CHG
IPRECHG
15 0- 45 0 mA,
100mA steps,
450mA Default
ITRICKLE _0mA
90mA
System I/O
available
INTB
t PRE CH G_TMR
tFA ST_TM R
45m in
re se t
100-2000mA,
500mA Default
IBAT
So ft-St art =2 ms
100-650mA, 50mA steps,
100mA Default
ITOPOFF
IBAT = 0mA
INT1
INT2
Read
& clear
Read
& clear
INT3
Read
& clear
Fast charge timer if enabled,
p rogram ma bl e
reset
tTOP OFF_ TMR
reset
Note 1: INT1 for Top-Of f 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 rest art condition is made on purpose to show the behavior.
Figure 5. Typical Charging Profile in No Fault Condition
BC3770
17
Analog Integrated Circuit Device Data
Freescale Semiconductor