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LM27761

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Low-Noise Regulated Inverter with Integrated LDO

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Data sheet

LM27761

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) -5.2 Vout (max) (V) -1.5 Iout (max) (A) 0.25 Regulated outputs (#) 1 Switching frequency (min) (kHz) 1700 Switching frequency (max) (kHz) 2300 Iq (typ) (mA) 0.37 Features Enable, Integrated LDO, Light Load Efficiency Mode, Output discharge, Synchronous Rectification, UVLO Fixed Operating temperature range (°C) -40 to 85 Rating Catalog Type Charge pump
Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) -5.2 Vout (max) (V) -1.5 Iout (max) (A) 0.25 Regulated outputs (#) 1 Switching frequency (min) (kHz) 1700 Switching frequency (max) (kHz) 2300 Iq (typ) (mA) 0.37 Features Enable, Integrated LDO, Light Load Efficiency Mode, Output discharge, Synchronous Rectification, UVLO Fixed Operating temperature range (°C) -40 to 85 Rating Catalog Type Charge pump
WSON (DSG) 8 4 mm² 2 x 2
  • Inverts and Regulates the Input Supply Voltage
  • Low Output Ripple
  • Shutdown Lowers Quiescent Current to 7 µA (Typical)
  • Up to 250-mA Output Current
  • 2.5-Ω Inverter Output Impedance, VIN = 5 V
  • ±4% Regulation at Peak Load
  • 370-µA Quiescent Current
  • 2-MHz (Typical) Low-Noise Fixed-Frequency Operation
  • 35-dB (Typical) LDO PSRR at 2 MHz
    With 80-mA Load Current
  • 30-mV LDO Dropout Voltage at 100 mA,
    VOUT = –5 V
  • Current Limit and Thermal Protection
  • Create a Custom Design Using the LM27761 With the WEBENCH® Power Designer
  • Inverts and Regulates the Input Supply Voltage
  • Low Output Ripple
  • Shutdown Lowers Quiescent Current to 7 µA (Typical)
  • Up to 250-mA Output Current
  • 2.5-Ω Inverter Output Impedance, VIN = 5 V
  • ±4% Regulation at Peak Load
  • 370-µA Quiescent Current
  • 2-MHz (Typical) Low-Noise Fixed-Frequency Operation
  • 35-dB (Typical) LDO PSRR at 2 MHz
    With 80-mA Load Current
  • 30-mV LDO Dropout Voltage at 100 mA,
    VOUT = –5 V
  • Current Limit and Thermal Protection
  • Create a Custom Design Using the LM27761 With the WEBENCH® Power Designer

The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7 V to 5.5 V. Four low-cost capacitors are used in the application solution to provide up to 250 mA of output current. The regulated output for the device is adjustable between −1.5 V and −5 V. The LM27761 operates at 2-MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370 µA (charge-pump power efficiency greater than 80% with most loads) and 7-µA typical shutdown current, the LM27761 provides ideal performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.

The LM27761 low-noise regulated switched-capacitor voltage inverter delivers a very low-noise adjustable output for an input voltage in the range of 2.7 V to 5.5 V. Four low-cost capacitors are used in the application solution to provide up to 250 mA of output current. The regulated output for the device is adjustable between −1.5 V and −5 V. The LM27761 operates at 2-MHz (typical) switching frequency to reduce output resistance and voltage ripple. With an operating current of only 370 µA (charge-pump power efficiency greater than 80% with most loads) and 7-µA typical shutdown current, the LM27761 provides ideal performance when driving power amplifiers, DAC bias rails, and other high-current, low-noise voltage applications.
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Technical documentation

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Type Title Date
* Data sheet LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter datasheet (Rev. C) PDF | HTML 25 Jan 2017
Application note Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) PDF | HTML 23 May 2022
Technical article Low-noise charge pumps make it easy to create negative voltages 30 Aug 2017
Technical article The top three ways to split a voltage rail to a bipolar supply 27 Dec 2016
Technical article Pump it up quietly 19 Feb 2016
EVM User's guide Using the LM27761EVM Evaluation Module 04 Dec 2015
White paper The Forgotten Converter 15 Jun 2015
Technical article Painting a picture for powering high-performance FPGAs 05 Sep 2013

Design & development

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Evaluation board

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User guide: PDF
Not available on TI.com
Evaluation board

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User guide: PDF
Not available on TI.com
Evaluation board

LM27761EVM — LM27761 Regulated Charge Pump Inverter Evaluation Module

The LM27761EVM aids in evaluation of the LM27761 Regulated Charge Pump Inverter.  The 2MHz switched capacitor boost provides up to 250 mA of output current utilizing few external components.  With a low current PFM or ECO mode, the LM27761 draws a minimal load from the power supply when (...)

User guide: PDF
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Simulation model

LM27761 Unencrypted PSpice Transient Model Package (Rev. A)

SNVMAK0A.ZIP (84 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

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Design guide: PDF
Schematic: PDF
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Design guide: PDF
Schematic: PDF
Reference designs

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Design guide: PDF
Schematic: PDF
Reference designs

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Design guide: PDF
Schematic: PDF
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