BQ24257 Datasheet, PDF (9/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

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BLOCK DIAGRAM
PMID
bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
IN
ILIM
Q1
Charge
Pump
+
CbC
Comparator
LDO
Q2
LDO
BOOT
VDPM
VREF_INLIM
VREF_DPM
Host
IIN_LIM
Amp
VIN_DPM
Amp
VDPM_DAC
I2C Only
TJ
125C
PWM
LOOP SELECT
COMPENSATION
DRIVER
V LDO
Q3
SW
PGND
Sleep
Comparator
_
VBAT +VSLP ⁺
EN1 / D+
EN2 / D-
SCL
SDA
Input
current limit
decoder /
D+ and D-
Decoder
I2C
Controller
VREF_BATREG
VREF_ICHG
ICHG
Amp _{_}
+
VBATREG
Amp _{_}
+
Termination
Comparator
VREF_TERM
Recharge Comparator
+ VBATREG ± 0.12V
VBAT
/ PG
CHARGE
CONTROLLER
-
ISET
CSIN
LDO
Q4
Batt Detect Or
Precharge
Curent Source
Charge
Pump
BAT
STAT
/CE
,
DISABLE
BATSHORT Comparator
+
VBAT
VBATSHRT
Supplement Comparator
+
VBAT ^VBSUP
VSYS
+
TS -10°C
+
TS 0°C
+
TS 10 °C
+
TS 45 °C
+
TS 60°C
VLDO
TS
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