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Número de pieza | LM2773 | |
Descripción | Low-Ripple 1.8V/1.6V Spread-Spectrum Switched Capacitor Step-Down Regulator | |
Fabricantes | National Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LM2773 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LM2773
Low-Ripple 1.8V/1.6V Spread-Spectrum Switched
Capacitor Step-Down Regulator
General Description
The LM2773 is a switched capacitor step-down regulator that
produces a selectable 1.8V or 1.6V output. It is capable of
supplying loads up to 300mA. The LM2773 operates with an
input voltage from 2.5V to 5.5V, accommodating 1-cell Li-Ion
batteries and chargers.
The LM2773 utilizes a regulated charge pump with gains of
2/3x and 1x. It has very low ripple and noise on both the input
and output due to its pre-regulated 1.15MHz (typ.) switching
frequency and spread spectrum operation. When output cur-
rents are low, the LM2773 automatically switches to a low-
ripple PFM regulation mode to maintain high efficiency over
the entire load range.
The LM2773 is available in National’s 0.5mm pitch 9-bump
Micro-SMD (µSMD-9).
Features
■ Low-Noise Spread Spectrum Operation
■ 1.8V/1.6V Selectable Output Voltage
■ 2% Output Voltage Regulation
■ > 75% Efficiency in 1.8V Mode
■ Very Low Output Ripple: 10mV @ 300mA
■ Output Currents up to 300mA
■ 2.5V to 5.5V Input Voltage Range
■ Shutdown Disconnects Load from VIN
■ 1.15MHz Switching Frequency
■ No Inductors…Small Solution Size
■ Short Circuit and Thermal Protection
■ 0.5mm pitch, µSMD-9 (1.511 × 1.511mm × 0.6mm)
Applications
■ Power Supply for DSP's, Memory, and Microprocessors
■ Mobile Phones and Pagers
■ Digital Cameras, Portable Music Players, and Other
Portable Electronic Devices
Typical Application Circuit
LM2773 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
30047401
© 2008 National Semiconductor Corporation 300474
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30047410
www.national.com
1 page Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V, CIN = C1 = C2 = 1.0µF,
COUT = 4.7µF, V(EN) = 1.8V, V(SEL) = 0V, TA = 25°C. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC's).
Output Voltage vs. Input Voltage, 1.8V Mode
Output Voltage vs. Input Voltage, 1.6V Mode
30047404
Output Voltage vs. Output Current, 1.8V Mode
30047405
Output Voltage vs. Output Current, 1.6V Mode
30047406
30047407
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5 www.national.com
5 Page Physical Dimensions inches (millimeters) unless otherwise noted
TLA09ZZA: 9-Bump Micro-SMD Package
x1: 1.511mm
x2: 1.511mm
x3: 0.6mm
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11 www.national.com
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet LM2773.PDF ] |
Número de pieza | Descripción | Fabricantes |
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LM2771 | LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter (Rev. A) | Texas Instruments |
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