BQ24157 Datasheet, PDF (13/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

www.ti.com
FUNCTIONAL BLOCK DIAGRAM (Charge Mode)
bq24157
SLUSB80 – SEPTEMBER 2012
PMID
PMID
PMID
VBUS
VBUS
PGND
PGND
PGND
VPMID
bq24157
NMOS
VBUS
VREF 1
Q1
Charge
Pump
I IN _ LIMIT
V _BUS
VUVLO
V _BUS
V _IN(MIN)
VBUS
VOVP_IN
TJ
T _SHTDWN
VOUT
VOVP
V IN _ DPM
T CF
TJ
+
-
+
-
+
-
+
-
+
-
OSC
-
+
-
+
-
+
-
VBUS UVLO
Poor Input
Source
VBUS OVP
Thermal
Shutdown
* ^{Battery OVP}
NMOS
Q2
PWM
Controller
CBC
Current
Limiting
PWM _ CHG
CHARGE CONTROL
TIMER and DISPLAY
LOGIC
I _LIMIT
-
+
-
Q3
NMOS
+
V _OUT
-
V _OREG
V CSIN
IOCHARGE
VREF
I _SHORT
LINEAR ^_CHG
VREF
REFERNCES
& BIAS
V _PMID
VREF 1
VOUT
VBAT
VBUS
VOREG - VRCH
VOUT
VOUT
VCSIN
I _TERM
VBAT
VSHORT
+
* ^Sleep
-
+
-
* ^Recharge
-
+_*
-
Termination
+
* ^{PWM Charge}
-
Mode
* Signal Deglitched
( I2 C Control )
Decoder
DAC
Figure 22. Function Block Diagram of bq2415x in Charge Mode
SW
SW
SW
CSOUT
CSIN
VREF
BOOT
STAT
CD
OTG (bq 24153 /8)
SLRST ( bq24156 )
SCL
SDA
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links :bq24157
Submit Documentation Feedback
13