TPS720_17 Datasheet, PDF (1/33 Pages) Texas Instruments – 350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin

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TPS720
SBVS100E – JUNE 2008 – REVISED SEPTEMBER 2015
TPS720 350 mA, Ultra-Low V_IN, RF Low-Dropout Linear Regulator With Bias Pin
1 Features
•1 350-mA High-Performance LDO
• Low Quiescent Current: 38 μA
• Excellent Load Transient Response:
±15 mV for I_LOAD = 0 mA to 350 mA in 1 μs
• Excellent Line Transient Response:
ΔV_OUT = ±2 mV for ΔV_BIAS = ±600 mV in 1 μs
ΔV_OUT = ±200 μV for ΔV_IN = ±400 mV in 1 μs
• Low Noise: 48 μV_RMS (10 Hz to 100 kHz)
• 80 dB V_IN PSRR (10 Hz to 10 kHz)
• 70 dB V_BIAS PSRR (10 Hz to 10 kHz)
• Fast Start-Up Time: 140 μs
• Built-In Soft-Start With Monotonic V_OUT Rise and
Start-Up Current Limited to 100 mA + I_LOAD
• Overcurrent and Thermal Protection
• Low Dropout: 110 mV at I_LOAD = 350 mA
• Stable with 2.2-μF Output Capacitor
• Available in 1.33 mm × 0.96 mm DSBGA-5 and 2
mm × 2 mm SON-6 Packages
2 Applications
• Digital Cameras
• Cellular Camera Phones
• Wireless LAN
• Handheld Products
3 Description
The TPS720 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 38 μA.
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
1.4 V 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 TPS720 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 TPS720 is stable with ceramic capacitors and
uses an advanced BICMOS fabrication process that
yields a dropout of 110 mV at a 350-mA output load.
The TPS720 has the unique feature of providing a
monotonic V_OUT rise (overshoot limited to 3%) with
V_IN inrush current limited to 100 mA + I_LOAD with an
output capacitor of 2.2 μF.
The TPS720 uses a precision voltage reference and
feedback loop to achieve overall accuracy of 2% over
load, line, process, and temperature extremes. An
ultra-small DSBGA package makes the TPS720 ideal
for handheld applications. The TPS720 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS720
DSBGA (5)
SON (6)
1.36 mm × 0.96 mm
2.00 mm × 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
V_BATT
C_BIAS
Standalone
dc/dc
Converter
or PMU
1.8 V
C_IN
BIAS
IN
OUT
TPS720xx
EN
GND
1.3 V
V_EN
V_CORE
C_OUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.