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LM2664M6/NOPB

Charge pump voltage inverter, 1.8-5.5V to -1.8 to -5.5V, 40mA, 91% eff, SOT-23-6

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Manufacturer Part：

LM2664M6/NOPB

Package：

SOT-23-6 / DBV (2.9 x 1.6 x 1.15mm)

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Description

Product Overview

The LM2664M6/NOPB from Texas Instruments is a CMOS switched-capacitor voltage inverter in a SOT-23-6 package. It converts a 1.8V to 5.5V positive input to the corresponding negative output (-1.8V to -5.5V) at up to 40mA, with 91% typical conversion efficiency, 12Ω output impedance, 160kHz oscillator, and 1μA shutdown current for battery-powered negative rail generation.

Key Specifications

Input Voltage Range 1.8V to 5.5V
Output Voltage -VIN (inverted, ratiometric)
Output Current Up to 40mA
Output Impedance 12Ω typ.
Conversion Efficiency 91% typ. at 40mA
Oscillator Frequency 160kHz (switching at 80kHz)
Operating Supply Current 220μA typ.
Shutdown Current 1μA typ.
Output Resistance (switching) 12Ω typ.
Output Voltage Ripple Typ. 30mVpp at 5V, 40mA
External Components 2 capacitors (CIN, CPUMP)
Package SOT-23-6 (2.9 x 1.6mm)
Operating Temperature -40°C to +85°C

Features

  • Inverts input supply voltage (positive to negative)
  • 1.8V to 5.5V input range
  • Up to 40mA output current
    • 91% typical conversion efficiency at 40mA
  • 12Ω typical output impedance
  • 160kHz oscillator frequency (80kHz switching)
  • 1μA typical shutdown current
  • 220μA typical operating current
  • Only 2 external capacitors required
  • 6-pin SOT-23 package for compact designs

Applications

  • Negative rail generation for op-amps from single supply
  • Cell phone and PDA LCD bias supply
  • Portable instrument negative voltage reference
  • Interface power supply inversion
  • GAAS FET bias generation

The LM2664M6/NOPB from Texas Instruments is a CMOS charge-pump voltage converter that inverts a positive input voltage in the range of 1.8V to 5.5V to the corresponding negative voltage (-1.8V to -5.5V). Using only two low-cost external capacitors, it provides up to 40mA output current with 91% typical conversion efficiency. The 160kHz oscillator frequency reduces output resistance and voltage ripple. With 220μA operating current and 1μA shutdown current, the device is optimized for battery-powered systems requiring a negative rail from a single positive supply.

The LM2664 uses a switched-capacitor charge-pump circuit with two phases. During Phase 1 (charge), the internal flying capacitor (CP) is connected between VIN and GND, charging it to the input voltage. During Phase 2 (transfer), the flying capacitor is reconnected with its positive terminal to GND and its negative terminal to the output, transferring the stored charge to the output capacitor (CO) and generating a negative voltage at the OUT pin. The internal MOSFET switches alternate between these two phases at 80kHz (160kHz oscillator, divide-by-2), creating an inverted output voltage approximately equal to -VIN. The 12Ω output impedance results from the combined on-resistance of the internal switches and the ESR of the external capacitors. The SD pin disables the oscillator and reduces current to 1μA in shutdown mode.

Pin Name Type Function
1 GND Power Ground reference
2 OUT Power Negative voltage output
3 CAP- Analog Flying capacitor negative terminal
4 SD Input Shutdown control (high=on, low=shutdown)
5 V+ Power Positive input supply (1.8V to 5.5V)
6 CAP+ Analog Flying capacitor positive terminal
  • Negative rail generation for dual-supply op-amps from single battery
  • Cell phone LCD bias voltage inverter
  • Portable instrument negative reference for ADC/DAC
  • GAAS FET gate bias from single positive supply
  • RS-232 negative supply generation from 3.3V or 5V
Manufacturer Part Number Package Notes
TI LM2664M6X/NOPB SOT-23-6 Tape and reel version
TI LM27761DSGR WSON-8 Low-noise inverting charge pump + LDO
ADI ADM660ARZ SOIC-8 50mA, 1.5-7V inverting charge pump
onsemi NCP883SN185T1G TSOP-5 5V to -5V inverting charge pump
Microchip TC1121EOA713 SOIC-8 80mA inverting charge pump
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Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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