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LM2771 Scheda tecnica(PDF) 1 Page - Texas Instruments

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Il numero della parte LM2771
Spiegazioni elettronici  Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM2771
VIN
VOUT
EN
Capacitors: 1 PF - TDK C1005X5R1A105K
4.7 PF - TDK C1608X5R0J475K
or equivalent
VIN = 3.0V to 5.5V
Cfly
1 PF
CIN
1 PF
COUT
4.7PF
VOUT: 1.5V
IOUT up to 250 mA
C1+
C1-
GND
LM2771
www.ti.com
SNVS435 – MARCH 2006
LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter
Check for Samples: LM2771
1
FEATURES
No Inductors…Small Solution Size
Current Limit and Thermal Protection
2
Low-Noise Fixed Frequency Operation
WSON-10 Package (3mm × 3mm × 0.8mm)
1.5V Output Voltage
Li-Ion (3.6V) to 1.5V with 81% Efficiency
APPLICATIONS
1.7% Output Voltage Accuracy
DSP, Memory, and Microprocessor Power
Very Low Output Ripple: 8mV @ 250mA
Supplies
Output Currents up to 250mA
Mobile Phones and Pagers
2.7V to 5.5V Input Range
Portable Electronic Devices
Shutdown Disconnects Load from VIN
1.1MHz Switching Frequency
DESCRIPTION
The LM2771 is a switched capacitor step-down regulator that produces a 1.5V output without the use of an
inductor. It is capable of supplying loads up to 250mA. The LM2771 operates with an input voltage from 2.7V to
5.5V, and requires only 3 low-cost ceramic capacitors.
The LM2771 uses a regulated 0.5x charge pump to give power conversion efficiencies nearly twice as high as an
LDO. 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 (<30mA typ.), the part automatically switches to a low-ripple PFM
regulation mode to maintain high efficiency over the entire load range. At input voltages below 3.5V (Typ), the
charge pump goes into pass mode, with efficiencies similar to an LDO.
The LM2771 is available in National’s 10-pad Leadless Leadframe No-Pullback Package (WSON-10).
Typical Application Circuit
LM2771 Efficiency vs.
Low-Dropout Linear Regulator (LDO) Efficiency
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006, Texas Instruments Incorporated
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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