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LMC7660IMX/NOPB

TI CMOS charge-pump voltage inverter, +1.5V~+10V to -1.5V~-10V, SOIC-8, 99% efficiency

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Manufacturer Part：

LMC7660IMX/NOPB

Package：

SOIC-8 (IMX suffix, 4.9mm x 3.9mm)

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Description

Product Overview

The LMC7660IMX/NOPB from TI/National Semiconductor is a CMOS charge-pump voltage inverter that converts a positive +1.5V to +10V input into the corresponding negative -1.5V to -10V output. Requiring only two external capacitors, it provides a simple and efficient solution for generating negative supply rails in op-amp circuits, LCD displays, and data acquisition systems.

Key Specifications

Input Voltage Range +1.5V ~ +10V
Output Voltage -VIN (inverted output)
Output Current 20mA typical (VIN=5V)
Conversion Efficiency 99% (no load, VIN=5V)
Oscillator Frequency 10kHz typical
Quiescent Current 200uA typical (VIN=5V)
Output Resistance 50 ohm typical (VIN=5V, IOUT=1mA)
External Capacitors 2 x 10uF (pump + output)
Operating Temperature -40C ~ +85C

Features

  • Simple voltage inversion with only 2 external capacitors
  • 99% conversion efficiency at no load
  • Operates down to +1.5V input with LV pin grounded
  • Cascadable for -2xVIN output voltage
  • Parallelable for lower output resistance
  • Internal oscillator with external drive option

Applications

  • Negative supply for dual-rail operational amplifiers
  • LCD contrast adjustment voltage generation
  • Data acquisition system negative reference
  • Battery-powered instrumentation negative rail
  • RS-232 negative voltage generation

The LMC7660IMX/NOPB from Texas Instruments (originally National Semiconductor) is a CMOS charge-pump voltage inverter that converts a positive supply voltage from +1.5V to +10V into the corresponding negative voltage. The device requires only two external capacitors (typically 10uF each for the pump capacitor and output filter), making it one of the simplest solutions for generating a negative supply rail. At VIN=5V, the conversion efficiency reaches 99% under no-load conditions, and the device can deliver up to 20mA of output current with a 50-ohm typical output resistance. The internal oscillator runs at approximately 10kHz, but the OSC pin allows external clock driving for applications requiring synchronized operation or a different switching frequency. For inputs above 3V, the LV (Low Voltage) pin should be grounded to ensure proper start-up and operation at lower input voltages down to 1.5V.

The LMC7660IMX/NOPB uses a flying-capacitor charge-pump (also called a switched-capacitor inverter) topology. The internal oscillator generates two non-overlapping clock phases. During Phase 1, the pump capacitor (connected between CAP+ and CAP-) is connected across the input voltage (V+ to GND) and charges to VIN. During Phase 2, the pump capacitor is reconnected with its positive terminal to GND and its negative terminal to the output (VOUT). Since the capacitor already holds a charge of VIN, the output node is driven to -VIN minus the voltage drops across the internal switches. This cycle repeats at the oscillator frequency (10kHz typical), effectively transferring charge from the input to the inverted output. The output capacitor smooths the voltage ripple. For cascaded operation (achieving -2VIN), a second LMC7660 can be connected with its input tied to the -VIN output of the first, producing -2VIN at the second output.

Pin Name Function
1 NC No Connect
2 CAP+ Pump Capacitor Positive Terminal
3 GND Ground (0V)
4 CAP- Pump Capacitor Negative Terminal
5 VOUT Negative Voltage Output (-VIN)
6 LV Low Voltage Operation (ground for VIN>3V)
7 OSC Oscillator Input (float or external drive)
8 V+ Positive Supply Input
  • Op-amp negative supply: Generate a -5V rail from a +5V supply to power dual-supply op-amps in signal conditioning circuits
  • LCD contrast: Produce the negative bias voltage for LCD panel contrast adjustment in embedded display modules
  • Data acquisition: Provide the negative reference voltage for ADCs and DACs that require plus/minus supply rails
  • RS-232 drivers: Generate the negative voltage needed by RS-232 transmitters from a single +5V logic supply
  • Portable instruments: Create a negative rail for battery-powered measurement equipment without adding a second battery
Model Brand Vin Range Iout Package
ICL7660CPA Renesis/Intersil 1.5~10V 20mA DIP-8
TC7660EOA Microchip 1.5~10V 20mA SOIC-8
LM27761DSGR TI 2.7~5.5V 250mA WSON-8
TPS60400DBVR TI 1.6~5.5V 60mA SOT-23-5
MAX828EUK+T ADI 1.5~5.5V 25mA SOT-23-5
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