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LM27761

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Low-Noise Regulated Inverter with Integrated LDO

Data sheet
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Low-Noise Regulated Inverter with Integrated LDO

LM27761

ACTIVE
Data sheet Order now

Product details

Parameters

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 Type Charge Pump Rating Catalog open-in-new Find other Charge pumps (inductorless)

Package | Pins | Size

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Features

  • 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

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Description

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
* Datasheet LM27761 Low-Noise, Regulated, Switched-Capacitor Voltage Inverter datasheet (Rev. C) Jan. 25, 2017
Application notes A Topical Index of TI Low Power Buck DC/DC Application Notes Jan. 17, 2018
Technical articles Low-noise charge pumps make it easy to create negative voltages Aug. 29, 2017
Technical articles The top three ways to split a voltage rail to a bipolar supply Dec. 27, 2016
Technical articles Pump it up quietly Feb. 19, 2016
User guides Using the LM27761EVM Evaluation Module Dec. 04, 2015
White papers The Forgotten Converter Jun. 15, 2015
Technical articles Painting a picture for powering high-performance FPGAs Sep. 05, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
Description

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 available (...)

Features
  • Allows evaluation of DAC38RF80/84/90 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with 2:1 impedance transformer for (...)
View details
EVALUATION BOARDS Download
document-generic User guide
Description
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 (...)
Features
  • Allows evaluation of DAC38RF82/83/85/93 up to 9GSPS sampling rate
  • Supports up to 12.5Gbps serdes signaling rate across FMC
  • Integrated low phase noise On–chip PLL with 2 VCOs to simplify system clock generation. Also supports external clock mode.
  • AC coupled, differential output with on-board 2:1 (...)
View details
EVALUATION BOARDS Download
document-generic User guide
Description
The DAC38RF86 evaluation module (EVM) is the circuit board for evaluating DAC38RF86 digital-to-analog converters (DACs). The EVM 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 connector also (...)
Features
  • Allows evaluation of DAC38RF86 or DAC38RF96 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with integrated impedance transformer (...)
View details
EVALUATION BOARDS Download
document-generic User guide
Description
The DAC38RF87 evaluation module (EVM) is the circuit board for evaluating the DAC38RF87 digital-to-analog converter (DAC). The EVM 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 connector (...)
Features
  • Allows evaluation of DAC38RF87/97 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with integrated impedance transformer (DAC38RF87) for (...)
View details
EVALUATION BOARDS Download
document-generic User guide
Description

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 (...)

Features
  • Allows evaluation of DAC38RF89 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with integrated impedance transformer (DAC38RF89) for (...)
View details
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

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 (...)

Features
  • Up to 250mA output current
  • Integrated externally configurable LDO
  • PFM mode at light currents
  • 2MHz switching frequency
  • Very small solution size with no inductor
View details

Design tools & simulation

SIMULATION MODELS Download
SNVMAK0A.ZIP (84 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Power Supply Reference Design for Optimizing Spur and Phase Noise in RF-sampling DACs
TIDA-01215 — 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 while (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
RF-Sampling S-Band Radar Transmitter Reference Design
TIDA-01240 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Bandwidth Zero-IF Reference Design for Microwave Backhaul
TIDA-01435 — 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 a (...)
document-generic Schematic document-generic User guide
Design files
View details
REFERENCE DESIGNS Download
Continuous Wave Phase-aligned Multitone Generator: DC-to-6-GHz RF-Sampling DAC Reference Design
TIDA-01084 — 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 (...)
document-generic Schematic document-generic User guide

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