BQ24152 Datasheet, PDF (12/38 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

bq24152
SLUS847 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
FUNCTIONAL BLOCK DIAGRAM (Boost Mode)
PMID
PMID
PMID
VBUS
VBUS
V_BUS
NMOS
VREF1
Q1
Charge
Pump
+
I_BO
-
V_BUS
+
V_BUSOVP
-
T_J
+
T_SHTDWN
-
V_PMID
bq24152
NMOS
OSC
+
- ^VBUS_FB
VBUS OVP
Thermal
Shutdown
Q2
CBC
PWM
Current
Limiting
I_BLIMIT
Controller
Q3
PFM Mode
-
+
75mA
NMOS
VREF
PWM_BOOST
V_{BUS_FB REFERNCES}
& BIAS
VPMID
VREF1
VBAT
V_OUT
V_BATMAX
+
* ^{Battery OVP}
-
CHARGE CONTROL,
TIMER and DISPLAY
LOGIC
PGND
PGND
PGND
V_BAT
V_BATMIN
+
* ^{Low Battery}
-
* Signal Deglitched
(I2C Control)
Decoder
DAC
SW
SW
SW
CSOUT
CSIN
VREF
BOOT
AUXPWR
STAT
OTG
SCL
SDA
Figure 22. Function Block Diagram of bq24152 in Boost Mode
12
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