LM2772 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Low-Ripple Switched Capacitor Step-Down Regulator

December 2006
LM2772
Low-Ripple Switched Capacitor Step-Down Regulator
General Description
The LM2772 is a switched capacitor step-down regulator that
produces a 1.2V output. It is capable of supplying loads up to
150mA with 3% output voltage regulation over line, load, and
temperature. The LM2772 operates with an input voltage from
3.0V to 5.5V, accommodating 1-cell Li-Ion batteries and
chargers.
The LM2772 utilizes a highly efficient regulated multi-gain
charge pump. Pre-regulated 1.1MHz fixed-frequency switch-
ing results in very low ripple and noise on both the input and
the output. When output currents are low, the part automati-
cally switches to a low-ripple PFM regulation mode to main-
tain high efficiency over the entire load range.
The LM2772 is available in National’s 10-pad Leadless Lead-
frame No-Pullback Package (LLP-10).
Features
■ ^{Low-Noise Fixed Frequency Operation}
■ ^{1.2V Output Voltage}
■ ^{3% Output Voltage Regulation}
■ ^{Li-Ion (3.6V) to 1.2V with 80% Efficiency}
■ ^{Very Low Output Ripple: 8mV @ 150mA}
■ ^{Output Currents up to 150mA}
■ ^{2.7V to 5.5V Input Voltage Range}
■ ^{Shutdown Disconnects Load from V}_IN
■ ^{1.1MHz Switching Frequency}
■ ^{No Inductors…Small Solution Size}
■ ^{Short Circuit and Thermal Protection}
■ ^{LLP-10 Package (3mm × 3mm × 0.8mm)}
Applications
■ ^{DSP, Memory, and Microprocessor Power Supplies}
■ ^{Mobile Phones and Pagers}
■ ^{Portable Electronic Devices}
Typical Application Circuit
LM2772 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
20216401
© 2007 National Semiconductor Corporation 202164
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