LM2772_15 Datasheet, PDF (1/17 Pages) Texas Instruments – LM2772 Low-Ripple Switched Capacitor Step-Down Regulator

LM2772
www.ti.com
SNVS486B – DECEMBER 2006 – REVISED MAY 2013
LM2772 Low-Ripple Switched Capacitor Step-Down Regulator
Check for Samples: LM2772
FEATURES
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•2 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
• WSON-10 Package (3mm × 3mm × 0.8mm)
APPLICATIONS
• DSP, Memory, and Microprocessor Power
Supplies
• Mobile Phones and Pagers
• Portable Electronic Devices
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 switching results in very low ripple and
noise on both the input and the output. When output
currents are low, the part automatically switches to a
low-ripple PFM regulation mode to maintain high
efficiency over the entire load range.
The LM2772 is available in TI’s WSON-10 Package
(WSON-10).
Typical Application Circuit
V_IN = 3.0V to 5.5V
V_IN
C_IN
1 µF
V_OUT
V_OUT: 1.2V
I_OUT up to 150 mA
C_OUT
4.7 µF
GND
C1+
LM2772
C1
High: ON
1 µF
Low: Shutdown
EN
C1-
C3+
C2+
C3
1 µF
C2
1 µF
C3-
C2-
Capacitors: 1 µF - TDK C1005X5R0J105K
4.7 µF - TDK C1608X5R0J475K
or equivalent
Figure 1.
Figure 2. LM2772 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
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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.
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