Datasheet

IN OUT
SENSE
GND
V
IN
> 3 V
2.5 V at 1.5 A
SHDN
TPS7A4525
10 µF
(ceramic)
10 µF
(ceramic)
+
C1
10 µF
R3
2 kW
R2
80.6 kW
R4
2.2 kW
R5
0.01 W
R6
2.2 kW
TPS7A4518
SHDN
OUT
SENSE
-
+
R8
100 kW
LOAD
R7
470 kW
C3
1 µF
C2
3.3 µF
IN
GND
V > 2.7 V
IN
R1
1 kW
TPS7A45xx
www.ti.com SLVS720D –JUNE 2008–REVISED AUGUST 2011
APPLICATION INFORMATION
The TPS7A45xx series are 1.5-A low-dropout voltages. In battery-backup applications where the
regulators optimized for fast transient response. The output can be held up by a backup battery when the
devices are capable of supplying 1.5 A at a dropout input is pulled to ground, the TPS7A45xx acts as if it
voltage of 300 mV. The low operating quiescent has a diode in series with its output and prevents
current (1 mA) drops to less than 1 μA in shutdown. reverse current flow. Additionally, in dual-supply
In addition to the low quiescent current, the applications where the regulator load is returned to a
TPS7A45xx regulators incorporate several protection negative supply, the output can be pulled below
features that make them ideal for use in ground by as much as (20 V - VIN) and still allow the
battery-powered systems. The devices are protected device to start and operate.
against both reverse input and reverse output
Typical Applications
Figure 29. 3.3 V to 2.5 V Regulator
NOTE: All capacitors are ceramic.
Figure 30. Adjustable Current Source
Copyright © 2008–2011, Texas Instruments Incorporated 13