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LM2776

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Switched Capacitor Inverter

Data sheet
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Switched Capacitor Inverter

LM2776

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Vout (Min) (V) -5.5 Vout (Max) (V) -2.7 Iout (Max) (A) 0.2 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 1700 Switching frequency (Max) (kHz) 2300 Iq (Typ) (mA) 0.1 Features Enable, Light Load Efficiency Mode, Output Discharge, Synchronous Rectification, UVLO Fixed Operating temperature range (C) -40 to 85 Type Charge Pump, Converter Rating Catalog open-in-new Find other Charge pumps (inductorless)

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Charge pumps (inductorless)

Features

  • Input Voltage: 2.7 V to 5.5 V
  • 200-mA Output Current
  • Inverts Input Supply Voltage
  • Low-Current PFM Mode Operation
  • 2-MHz Switching Frequency
  • Greater than 90% Efficiency
  • Current Limit and Thermal Protection
  • No Inductors
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Description

The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range from 2.7 V to 5.5 V to the corresponding negative voltage. The LM2776 uses three low-cost capacitors to provide 200 mA of output current without the cost, size, and electromagnetic interference (EMI) related to inductor-based converters.

With an operating current of only 100 µA and operating efficiency greater than 90% at most loads, the LM2776 provides ideal performance for battery-powered systems requiring a high power negative power supply.

The LM2776 has been placed in TI’s 6-pin SOT-23 to maintain a small form factor.

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Technical documentation

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Type Title Date
* Data sheet LM2776 Switched Capacitor Inverter datasheet (Rev. B) Feb. 07, 2017
Application note A Topical Index of TI Low Power Buck DC/DC Application Notes (Rev. A) Jun. 25, 2021
Technical article Low-noise charge pumps make it easy to create negative voltages Aug. 30, 2017
Technical article Pump it up quietly Feb. 19, 2016
Technical article Pump it up with charge pumps – Part 1 Feb. 01, 2016
White paper The Forgotten Converter Jun. 15, 2015
User guide Using the LM2776 Evaluation Module May 19, 2015
Technical article 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 BOARD Download
document-generic User guide
49
Description

The LM2776EVM aids in evaluation of the LM2776 Charge Pump Inverter.  The 2 MHz switched capacitor  boost provides up to 200mA of output current utilizing 3 small external capacitors.  With a low current PFM or ECO mode, the LM2776 draws a minimal load from the power supply when the (...)

Features
  • 200mA Output Current
  • Very Low Output Impedance
  • PFM Mode at Light Currents
  • 2 MHz Switching Frequency
  • Very Small Solution Size with No Inductor
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Design tools & simulation

SIMULATION MODEL Download
SNVMAR2A.ZIP (80 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
View details

Reference designs

REFERENCE DESIGNS Download
9.8GHz RF CW Signal Generator Using Integrated Synthesizer With Spur Reduction Reference Design
TIDA-00626 — This design is a 9.8-GHz wideband, low-phase noise, integrated continuous wave (CW) RF signal generator with versatile spur reduction technique. The output level can be programmed from -32 dBm to 14.5 dBm in 0.5-dB steps. This signal generator can be used as local oscillator for applications, such (...)
document-generic Schematic
REFERENCE DESIGNS Download
High Accuracy AC Current Measurement Reference Design using PCB Rogowski Coil Sensor
TIDA-01063 — TIDA-01063 is a reference design for current sensing using a PCB Rogowski Coil sensor to achieve very good linearity for wide measurement range at very low system BOM cost. PCB Rogowski sensor is advantageous for isolated current measurement due to very high bandwidth of 20 MHz and fast settling (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

Ordering & quality

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  • Ongoing reliability monitoring

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