Datasheet
16
15
14
13
12
11
10
9
12345678
2423222120191817
ISET
PB_IN
RESET
INT
SDAT
MODE
NC
NC
P GN D
L1
B A T
B A T
SY S
S Y S
A C
A C
25
26
27
28
29
30
31
32
TPS65721
HOLD_DCDC1
FB_DCDC1
TS
AGND
GND
VINLDO1
VLDO1
NC
FB_LDO1
HOLD_LDO1
THRESHOLD
GPIO3
GPIO1
GPIO2
GPIO0
SCLK
TPS65720
TPS65721
SLVS979 –OCTOBER 2009
www.ti.com
PIN FUNCTIONS for CHIP SCALE VERSION (YFF package)
PIN
I/O DESCRIPTION
NAME NO.
AC E5 I Input power for power manager, connect to external DC supply.
SYS E4, D4 O System voltage; output of the power path manager. Power input for step-down converter DCDC1
BAT E3, D3 I/O Connect to battery + terminal
ISET D5 I Connect a resistor from this pin to GND to set fast charge current
TS C2 I Connect a thermistor from this pin to GND for battery temperature
AGND C1 Analog ground
PGND E1 Power ground
GND B2 Connect to AGND and PGND
L1 E2 O Switch output of step-down converter
FB_DCDC1 D1 I Feedback input of step-down converter
HOLD_DCDC1 D2 I Power-On input for DCDC1 converter. When pulled HIGH, the DCDC converter is kept enabled after
PB_IN was released HIGH.
VINLDO1 B1 I Input voltage for LDO1
VLDO1 A1 O Output voltage of LDO1
HOLD_LDO1 A2 I Power-On input for LDO1. When pulled HIGH, LDO1 is kept enabled after PB_IN was released
HIGH.
SDAT B5 I/O Data line for the I2C interface
SCLK A5 I Clock input for the I2C interface
PB_IN C4 I Push button input; Turns on DCDC1 and LDO1 if pulled to GND.
INT C3 O Open drain interrupt output
RESET C5 O Open drain output of the reset generator; This output goes active LOW when the output voltage of
LDO1 falls 8% below its target voltage.
GPIO0 B4 I/O General purpose I/O
GPIO1 A4 I/O General purpose I/O
GPIO2 B3 I/O General purpose I/O or 5mA current sink
GPIO3 A3 I/O General purpose I/O or 5mA current sink
QFN version (RSN package): PIN ASSIGNMENT (top view)
10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS65720 TPS65721