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PDF LM2772 Data sheet ( Hoja de datos )
| Número de pieza | LM2772 | |
| Descripción | Low-Ripple Switched Capacitor Step-Down Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2772 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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 VIN
■ 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
www.DataSheet.in
20216413
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V, CIN = C1 = C2 = C3 = 1.0µF,
COUT = 4.7µF, TA = 25ºC. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC's).
Output Voltage vs. Input Voltage
Output Voltage vs. Output Current
20216412
Efficiency vs. Input Voltage
Operating Supply Current
20216414
20216413
20216426
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5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
SDA10A: 10-Pin Non-Pullback Leadless Leadframe Package
3.0mm × 3.0mm × 0.8mm
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11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM2772.PDF ] | |
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