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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

Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
Rating Catalog Iout (max) (A) 0.25 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 1.5 Vout (min) (V) 1.5 Features Adjustable current limit, Regulated Operating temperature range (°C) -30 to 110 Iq (typ) (A) 0.000045
WSON (DSC) 10 9 mm² (3 mm × 3 mm)
  • 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)

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  • 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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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM2771 Low-Ripple 250mA Switched Capacitor Step-Down DC/DC Converter datasheet (Rev. A) 01.05.2013
Auswahlhilfe Power Management Guide 2018 (Rev. R) 25.06.2018
Technischer Artikel Charge pumps: An often unconsidered method of DC/DC conversion PDF | HTML 17.07.2015
Technischer Artikel Charge pump, inductor-based converter or LDO? PDF | HTML 19.06.2015
Whitepaper The Forgotten Converter 15.06.2015

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