Datasheet
SLVS333 − AUGUST 2001
9
www.ti.com
Terminal Functions
TERMINAL
NO.
I/O
DESCRIPTION
NAME
PWP-14 DGQ-10
I/O
DESCRIPTION
NAME
TPS2145 TPS2155 TPS2147 TPS2157
EN1 14 10
I Logic level enable to transfer power to OUT1
EN1 14 10
I
Logic level enable to transfer power to OUT1
EN2 13 9
I Logic level enable to transfer power to OUT2
EN2 13 9
I
Logic level enable to transfer power to OUT2
GND 8 8 6 6 Ground
LDO_ADJ 7 7 I User feedback for adjustable regulator
LDO_EN 10 10 I Logic level LDO enable. Active high.
LDO_OUT 4 4 4 4 O LDO output
NC 6, 9 6, 9 No connection
OC1 12 12 8 8 O Overcurrent status flag for OUT1. Open-drain output.
OC2 11 11 7 7 O Overcurrent status flag for OUT2. Open-drain output.
OUT1 1 1 1 1
O
Switch 1 output
OUT2 5 5 5 5
O
Switch 2 output
SWIN2 3 3 3 3 I Input for switch 2
VIN/SWIN1 2 2 2 2 I Input for LDO and switch 1; device supply voltage
detailed description
VIN/SWIN1
The VIN/SWIN1 serves as the input to the internal LDO and as the input to one N-channel MOSFET. The fixed
or adjustable LDO has a dropout voltage of 0.35 V and is rated for 200 mA of continuous current. The power
switch is an N-channel MOSFET with a maximum on-state resistance of 580 mΩ. Configured as a high-side
switch, the power switch prevents current flow from OUT to IN and IN to OUT when disabled. The power switch
is rated at 200 mA, continuous current. VIN/SWIN1 must be connected to a voltage source for device operation.
SWIN2
SWIN2 is the input to the other N-channel MOSFET, which also has a maximum on-state resistance of 580 mΩ.
Configured as a high-side switch, the power switch prevents current flow from OUT to IN and IN to OUT when
disabled. The power switch is rated at 200 mA, continuous current.
OUTx
OUT1 and OUT2 are the outputs from the internal power-distribution switches.
LDO_OUT
LDO_OUT is the output of the internal 200-mA LDO. The fixed version of the LDO has an output of 3.3 V. The
adjustable version has an output voltage range of 1 V to 3.3 V.
LDO_ADJ
This input only applies to the adjustable LDO version of this device (TPS2145/55). LDO_ADJ is used to adjust
the output voltage anywhere between 1 V and 3.3 V.
LDO_EN
The active high input, LDO_EN, only applies to the adjustable LDO version of this device (TPS2145/55).
LDO_EN is used to enable the internal LDO and is compatible with TTL and CMOS logic.