TPS720XX_0809 Datasheet, PDF (1/22 Pages) Texas Instruments – 350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin

TPS720xx
www.ti.com ................................................................................................................................................ SBVS100C – JUNE 2008 – REVISED SEPTEMBER 2008
350mA, Ultra-Low V_IN, RF Low-Dropout Linear Regulator with Bias Pin
FEATURES
1
•2 350mA High-Performance LDO
• Low Quiescent Current: 38µA
• Excellent Load Transient Response:
±15mV for I_LOAD = 0mA to 350mA in 1µs
• Excellent Line Transient Response:
ΔV_OUT = ±2mV for ΔV_BIAS = ±600mV in 1µs
ΔV_OUT = ±200µV for ΔV_IN = ±400mV in 1µs
• Low Noise: 48µV_RMS (10Hz to 100kHz)
• 80dB V_IN PSRR (10Hz to 10kHz)
• 70dB V_BIAS PSRR (10Hz to 10kHz)
• Fast Start-Up Time: 140µs
• Built-In Soft-Start with Monotonic V_OUT Rise
and Startup Current Limited to 100mA + I_LOAD
• Over-Current and Thermal Protection
• Low Dropout: 110mV at I_LOAD = 350mA
• Stable with 2.2µF Output Capacitor
• Available in 1,33mm x 0,96mm WCSP-5 and
2mm x 2mm SON-6 Packages
APPLICATIONS
• Digital Cameras
• Cellular Camera Phones
• Wireless LAN
• Handheld Products
TPS720xx
DRV PACKAGE
2mm x 2mm SON-6
(TOP VIEW)
OUT 1
6 IN
NC 2 ^Thermal 5 GND
Pad
EN 3
4 BIAS
TPS720xx
YZU PACKAGE
1,33mm x 0,96mm WCSP-5
(TOP VIEW)
EN
GND
C3 C1
B2
BIAS
A3 A1
OUT
IN
DESCRIPTION
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.
The V_BIAS 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 V_IN, which can be a lower voltage than
V_BIAS; it can be as low as V_OUT + V_DO, increasing the
efficiency of the solution in many power-sensitive
applications. For example, V_IN can be an output of a
high-efficiency, dc-dc step-down regulator.
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 V_BIAS 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.
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 V_OUT rise (overshoot limited to 3%) with
V_IN inrush current limited to 100mA + I_LOAD with an
output capacitor of 2.2µF.
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 T_J = –40°C to +125°C.
V_BATT
Standalone
dc/dc
Converter
or PMU
1.8V
BIAS
IN
OUT
TPS720xx
1.3V
EN
GND
V_EN
V_CORE
2.2mF
Ceramic
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
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