TPS720xx
www.ti.com........................................................................................................................................................ SBVS100D–JUNE 2008–REVISED AUGUST 2009
350mA, Ultra-Low V , RF Low-Dropout Linear Regulator with Bias Pin
IN
1
FEATURES
DESCRIPTION
2
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350mA High-Performance LDO
The TPS720xx family of dual rail, low-dropout linear
regulators (LDOs) offers outstanding ac performance
(PSRR, load and line transient response), while
consuming a very low quiescent current of 38µA.
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Low Quiescent Current: 38µA
Excellent Load Transient Response:
±15mV for ILOAD = 0mA to 350mA in 1µs
The VBIAS rail that powers the control circuit of the
LDO draws very low current (on the order of the
quiescent current of the LDO) and can be connected
to any power supply that is equal to or greater than
1.4V above the output voltage. The main power path
is through VIN, which can be a lower voltage than
VBIAS; it can be as low as VOUT + VDO, increasing the
efficiency of the solution in many power-sensitive
applications. For example, VIN can be an output of a
high-efficiency, dc-dc step-down regulator.
•
Excellent Line Transient Response:
ΔVOUT = ±2mV for ΔVBIAS = ±600mV in 1µs
ΔVOUT = ±200µV for ΔVIN = ±400mV in 1µs
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Low Noise: 48µVRMS (10Hz to 100kHz)
80dB VIN PSRR (10Hz to 10kHz)
70dB VBIAS PSRR (10Hz to 10kHz)
Fast Start-Up Time: 140µs
Built-In Soft-Start with Monotonic VOUT Rise
and Startup Current Limited to 100mA + ILOAD
The TPS720xx supports a novel feature in which the
output of the LDO regulates under light loads when
the IN pin is left floating. The light-load drive current
is sourced from VBIAS under this condition. This
feature is particularly useful in power-saving
applications where the dc/dc converter connected to
the IN pin is disabled but the LDO is still required to
regulate the voltage to a light load.
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Over-Current and Thermal Protection
Low Dropout: 110mV at ILOAD = 350mA
Stable with 2.2µF Output Capacitor
Available in 1,33mm x 0,96mm WCSP-5 and
2mm x 2mm SON-6 Packages
APPLICATIONS
The TPS720xx is stable with ceramic capacitors and
uses an advanced BICMOS fabrication process that
yields a dropout of 110mV at a 350mA output load.
The TPS720xx has the unique feature of providing a
monotonic VOUT rise (overshoot limited to 3%) with
VIN inrush current limited to 100mA + ILOAD with an
output capacitor of 2.2µF.
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Digital Cameras
Cellular Camera Phones
Wireless LAN
Handheld Products
TPS720xx
DRV PACKAGE
2mm x 2mm SON-6
(TOP VIEW)
The TPS720xx uses a precision voltage reference
and feedback loop to achieve overall accuracy of 2%
over load, line, process, and temperature extremes.
An ultra-small wafer chip-scale package (WCSP)
makes the TPS720xx ideal for handheld applications.
The TPS720xx is also available in a SON-8 package.
This family of devices is fully specified over the
temperature range of TJ = –40°C to +125°C.
OUT
NC
1
2
3
6
5
4
IN
Thermal
Pad
GND
BIAS
EN
TPS720xx
YZU PACKAGE
VBATT
1,33mm x 0,96mm WCSP-5
(TOP VIEW)
C3
A3
C1
A1
BIAS
EN
GND
OUT
BIAS
1.8V
1.3V
Standalone
dc/dc
VCORE
IN
OUT
B2
TPS720xx
Converter
or PMU
2.2mF
Ceramic
EN
GND
IN
VEN
1
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.
2
All trademarks are the property of their respective owners.
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 © 2008–2009, Texas Instruments Incorporated
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