BQ24157 Datasheet, PDF (14/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

bq24157
SLUSB80 – SEPTEMBER 2012
FUNCTIONAL BLOCK DIAGRAM (Boost Mode)
PMID
PMID
PMID
VBUS
VBUS
NMOS
VBUS
VREF 1
Q1
Charge
Pump
V PMID
OSC
+
I _BO
-
+
VBUS_B _-
VBUS
VBUSOVP
TJ
TSHTDWN
VOUT
VBATMAX
PGND
PGND
PGND
VBAT
VBATMIN
+
VBUS OVP
-
+
Thermal
-
Shutdown
+
* ^{Battery OVP}
-
+
* ^{Low Battery}
-
* Signal Deglitched
bq24157
NMOS
Q2
PWM
Controller
CBC
Current
Limiting
I _BLIMIT
PFM Mode
-
+
75 mA
PWM _ BOOST
REFERNCES
& BIAS
Q3
NMOS
VREF
VPMID
VREF 1
CHARGE CONTROL,
TIMER and DISPLAY
LOGIC
V OUT
( I2 C Control)
Decoder
DAC
Figure 23. Function Block Diagram of bq2415x in Boost Mode
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SW
SW
SW
VREF
BOOT
CSIN
CSOUT
STAT
CD
OTG
SCL
SDA
14
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