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LM2770

ACTIVE

High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode

Product details

Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 1.2 Vout (max) (V) 1.575 Iout (max) (A) 0.25 Regulated outputs (#) 1 Switching frequency (min) (kHz) 475 Switching frequency (max) (kHz) 925 Iq (typ) (mA) 0.055 Features Dynamic Voltage Scaling Operating temperature range (°C) -30 to 105 Rating Catalog Type Charge pump
Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 1.2 Vout (max) (V) 1.575 Iout (max) (A) 0.25 Regulated outputs (#) 1 Switching frequency (min) (kHz) 475 Switching frequency (max) (kHz) 925 Iq (typ) (mA) 0.055 Features Dynamic Voltage Scaling Operating temperature range (°C) -30 to 105 Rating Catalog Type Charge pump
WSON (DSC) 10 9 mm² 3 x 3
  • High Efficiency Multi-Gain Architecture: Peak Power Efficiency >85%
  • Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V
  • Dynamic Output Voltage Selection
  • ±3% Output Voltage Accuracy
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Low-Supply-Current Sleep Mode
  • 55µA Quiescent Supply Current in Full-Power Mode
  • Soft-Start
  • Short-Circuit Protection in Full-Power Mode
  • Current-Limit Protection in Sleep Mode
  • WSON-10 Package (3mm × 3mm × 0.8mm)

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  • High Efficiency Multi-Gain Architecture: Peak Power Efficiency >85%
  • Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V
  • Dynamic Output Voltage Selection
  • ±3% Output Voltage Accuracy
  • Output Currents up to 250mA
  • 2.7V to 5.5V Input Range
  • Low-Supply-Current Sleep Mode
  • 55µA Quiescent Supply Current in Full-Power Mode
  • Soft-Start
  • Short-Circuit Protection in Full-Power Mode
  • Current-Limit Protection in Sleep Mode
  • WSON-10 Package (3mm × 3mm × 0.8mm)

All trademarks are the property of their respective owners.

The LM2770 is a switched capacitor step-down regulator that is ideal for powering low-voltage applications in portable systems. The LM2770 can supply load currents up to 250mA and operates over an input voltage range of 2.7V to 5.5V. This makes the LM2770 a great choice for systems powered by 1-cell Li-Ion batteries and chargers. The output voltage of the LM2770 can be dynamically switched between two output levels with a logic input pin. Output voltage pairs currently available include 1.2V/1.5V and 1.2V/1.575V. Other pairs of voltage options can be developed upon request.

LM2770 efficiency is superior to both fixed-gain switched capacitor buck regulators and low-dropout linear regulators (LDO's). Multiple fractional gains maximize power efficiency over the entire input voltage and output current ranges. The LM2770 can also be switched into a low-power sleep mode when load currents are light (≤ 20mA). In sleep mode, the charge pump is off, and the output is driven with a low-noise, low-power linear regulator.

Soft-start, short-circuit protection, current-limit protection, and thermal-shutdown protection are also included. The LM2770 is available in TI’s small 10-pin Leadless Leadframe Package (WSON-10).

The LM2770 is a switched capacitor step-down regulator that is ideal for powering low-voltage applications in portable systems. The LM2770 can supply load currents up to 250mA and operates over an input voltage range of 2.7V to 5.5V. This makes the LM2770 a great choice for systems powered by 1-cell Li-Ion batteries and chargers. The output voltage of the LM2770 can be dynamically switched between two output levels with a logic input pin. Output voltage pairs currently available include 1.2V/1.5V and 1.2V/1.575V. Other pairs of voltage options can be developed upon request.

LM2770 efficiency is superior to both fixed-gain switched capacitor buck regulators and low-dropout linear regulators (LDO's). Multiple fractional gains maximize power efficiency over the entire input voltage and output current ranges. The LM2770 can also be switched into a low-power sleep mode when load currents are light (≤ 20mA). In sleep mode, the charge pump is off, and the output is driven with a low-noise, low-power linear regulator.

Soft-start, short-circuit protection, current-limit protection, and thermal-shutdown protection are also included. The LM2770 is available in TI’s small 10-pin Leadless Leadframe Package (WSON-10).

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* Data sheet LM2770 High Efficiency Switched Cap Step-Down DC/DC Regulator w/Sleep Mode datasheet (Rev. E) 01 May 2013
Application note Power Management Design for Applications Processors 22 Mar 2007

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