Startseite Energiemanagement AC/DC & DC/DC converters (integrated FET)
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Energiemanagement
AC/DC & DC/DC converters (integrated FET)

LM2771

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DC/DC-Abwärtswandler, 250 mA, geringe Welligkeit, geschalteter Kondensator

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Datenblatt

LM2771

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Type Charge pump Switching frequency (min) (kHz) 800 Switching frequency (max) (kHz) 1400 Features Adjustable current limit Vout (min) (V) 1.5 Vout (max) (V) 1.5 Rating Catalog Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Type Charge pump Switching frequency (min) (kHz) 800 Switching frequency (max) (kHz) 1400 Features Adjustable current limit Vout (min) (V) 1.5 Vout (max) (V) 1.5 Rating Catalog Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
WSON (DSC) 10 9 mm² 3 x 3
  • Low-Noise Fixed Frequency Operation
  • 1.5V Output Voltage
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • 1.7% Output Voltage Accuracy
  • Very Low Output Ripple: 8mV @ 250mA
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Shutdown Disconnects Load from VIN
  • 1.1MHz Switching Frequency
  • No Inductors…Small Solution Size
  • Current Limit and Thermal Protection
  • WSON-10 Package (3mm × 3mm × 0.8mm)

All trademarks are the property of their respective owners.

  • Low-Noise Fixed Frequency Operation
  • 1.5V Output Voltage
  • Li-Ion (3.6V) to 1.5V with 81% Efficiency
  • 1.7% Output Voltage Accuracy
  • Very Low Output Ripple: 8mV @ 250mA
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Shutdown Disconnects Load from VIN
  • 1.1MHz Switching Frequency
  • No Inductors…Small Solution Size
  • Current Limit and Thermal Protection
  • WSON-10 Package (3mm × 3mm × 0.8mm)

All trademarks are the property of their respective owners.

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 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.
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Technische Dokumentation

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Typ Titel Datum
* Data sheet LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter datasheet (Rev. A) 01 Mai 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Charge pumps: An often unconsidered method of DC/DC conversion PDF | HTML 17 Jul 2015
Technical article Charge pump, inductor-based converter or LDO? PDF | HTML 19 Jun 2015
White paper The Forgotten Converter 15 Jun 2015
EVM User's guide AN-1547 LM2771 Evaluation Board (Rev. A) 30 Apr 2013

Design und Entwicklung

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Bestellen & Qualität

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