TPS7A45xx
www.ti.com ...................................................................................................................................................................................................... SLVS720–JUNE 2008
LOW-NOISE, FAST-TRANSIENT-RESPONSE 1.5-A LDO VOLTAGE REGULATORS
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FEATURES
DESCRIPTION
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Optimized for Fast Transient Response
Output Current: 1.5 A
The TPS7A45xx devices are low-dropout (LDO)
regulators optimized for fast transient response. The
device can supply 1.5 A of output current with a
dropout voltage of 300 mV. Operating quiescent
current is 1 mA, dropping to less than 1 µA in
shutdown. Quiescent current is well controlled; it does
not rise in dropout, as with many other regulators. In
addition to fast transient response, the TPS7A45xx
regulators have very low output noise, which makes
them ideal for sensitive RF supply applications.
High Output Voltage Accuracy : 1% at 25°C
Dropout Voltage: 300 mV
Low Noise: 35 µVRMS (10 Hz to 100 kHz)
High Ripple Rejection: 68 dB
1-mA Quiescent Current
No Protection Diodes Needed
Controlled Quiescent Current in Dropout
Fixed Output Voltages: 1.5 V, 1.8 V, 2.5 V, 3.3 V
Adjustable Output from 1.21 V to 20 V
<1-µA Quiescent Current in Shutdown
Stable with 10-µF Output Capacitor
Stable with Ceramic Capacitors
Reverse-Battery Protection
Output voltage range is from 1.21 V to 20 V. The
TPS7A45xx regulators are stable with output
capacitors as low as 10 µF. Small ceramic capacitors
can be used without the necessary addition of ESR,
as is common with other regulators. Internal
protection
circuitry
includes
reverse-battery
protection, current limiting, thermal limiting, and
reverse-current protection. The devices are available
in fixed output voltages of 1.5 V, 1.8 V, 2.5 V, 3.3 V,
and as an adjustable device with a 1.21-V reference
voltage. The TPS7A45xx regulators are available in
the 5-pin TO-263 (KTT) package.
No Reverse Current
Thermal Limiting
APPLICATIONS
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3.3-V to 2.5-V Logic Power Supplies
Post Regulator for Switching Supplies
Wireless Infrastructure
KTT PACKAGE
(TOP VIEW)
SENSE/ADJ
OUT
5
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3
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Radio-Frequency Systems
GND
IN
SHDN
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PowerPAD, PowerFLEX are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated