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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

Rating Catalog Operating temperature range (°C) -40 to 85 Type Charge pump Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1700 Switching frequency (max) (kHz) 2300 Features Enable, Integrated LDO, Light Load Efficiency Mode, Output discharge, Regulated, Synchronous Rectification, UVLO Fixed Vout (min) (V) -5.2 Vout (max) (V) -1.5 Iq (typ) (µA) 370
Rating Catalog Operating temperature range (°C) -40 to 85 Type Charge pump Iout (max) (A) 0.25 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 1700 Switching frequency (max) (kHz) 2300 Features Enable, Integrated LDO, Light Load Efficiency Mode, Output discharge, Regulated, Synchronous Rectification, UVLO Fixed Vout (min) (V) -5.2 Vout (max) (V) -1.5 Iq (typ) (µA) 370
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 PDF | HTML 30 Aug 2017
Technical article The top three ways to split a voltage rail to a bipolar supply PDF | HTML 27 Dec 2016
Technical article Pump it up quietly PDF | HTML 19 Feb 2016
EVM User's guide Using the LM27761EVM Evaluation Module 04 Dec 2015
White paper The Forgotten Converter 15 Jun 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

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The DAC38RF80EVM is the circuit board for evaluating DAC38RF80/84/90 digital-to-analog converters (DACs). The EVM can be used to evaluate the performance of the DAC up to 9-GSPS sampling rate. It is designed to work with the FPGA-based pattern generator card TSW14J56EVM (Rev B and up). The (...)

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

DAC38RF82EVM — DAC38RF82 Dual-Channel, 14-Bit, 9-GSPS, 1x-24x Interpolating, 6 & 9 GHz PLL DAC Evaluation Module

The DAC38RF82EVM is the circuit board for evaluating DAC38RF82/83/85/93 digital to analog converters (DACs). The EVM can be used to evaluate the performance of the DAC up to 9GSPS sampling rate and it is designed to work with the TSW14J56 EVM. The available FMC connector also makes it possible to (...)
User guide: PDF
Not available on TI.com
Evaluation board

DAC38RF89EVM — DAC38RF89 Dual-Channel, 14-Bit, 8.4GSPS, 1x-24x Interpolating, 5 & 7.5 GHz PLL DAC Evaluation Module

The DAC38RF89 evaluation module (EVM) is the circuit board for evaluating DAC38RF89 digital-to-analog converters (DACs). The DAC38RFEVM can be used to evaluate the performance of the DAC up to 9-GSPS sampling rate and is designed to work with the TSW14J56EVM (Rev B and up). The available FMC (...)

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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Reference designs

TIDA-01215 — Power Supply Reference Design for Optimizing Spur and Phase Noise in RF-sampling DACs

This reference design provides an efficient power supply scheme to power-up the RF-sampling DAC38RF8x digital-to-analog data converter (DAC) without sacrificing performance and also reduces board area and BOM. The reference design uses both DC/DC switchers and an LDO to power-up the DAC38RF8x (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01240 — RF-Sampling S-Band Radar Transmitter Reference Design

Synthesis of waveforms appropriate for an S-band multifunction phased array radar (MPAR) is demonstrated with an RF sampling architecture utilizing the DAC38RF80, a 9GSPS 16-bit digital-to-analog converter (DAC). The RF sampling transmit architecture simplifies the signal chain, bringing the data (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01435 — High-Bandwidth Zero-IF Reference Design for Microwave Backhaul

The TSW40RF82EVM reference design provides a platform to interface the DAC38RF82 with a high-performance modulator - the TRF370417EVM. The TRF370417EVM can modulate wideband signals at up to 6 GHz as would be typical for a microwave backhaul application. The TRF370417 device may be substituted for (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01084 — Continuous Wave Phase-aligned Multitone Generator: DC-to-6-GHz RF-Sampling DAC Reference Design

The TIDA-01084 reference design demonstrates the use of RF sampling DAC to generate continuous phase-aligned multitone waveforms. With four 48-bit independent NCOs, the 14-bit, 9GSPS DAC38RF83 can generate four CW tones placed anywhere within the first Nyquist zone or up to 6 GHz in the second.

This (...)


Design guide: PDF
Schematic: PDF
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