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LM2662MX/NOPB

200mA charge pump, invert/double 1.5-5.5V, 3.5R Rout, 20/150kHz selectable, SOIC-8

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Manufacturer Part：

LM2662MX/NOPB

Package：

SOIC-8 (4.90 x 6.00 x 1.75 mm)

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Description

Product Overview

The LM2662MX/NOPB from Texas Instruments is a 200mA CMOS charge-pump voltage converter that inverts a 1.5V to 5.5V positive input to the corresponding negative voltage, or doubles the input voltage. It features selectable 20kHz/150kHz oscillator frequency and 3.5 Ohm output resistance in an SOIC-8 package.

Key Specifications

Input Voltage 1.5 V to 5.5 V
Output Current 200 mA
Output Resistance 3.5 Ohm typical
Conversion Efficiency 86% typical @ 200mA
Oscillator Frequency 20 kHz (FC open) or 150 kHz (FC=V+)
Operating Current 300 uA typical (20kHz)
Shutdown Current N/A (LM2663 only)
Output Voltage -VIN (inverter) or 2xVIN (doubler)
Operating Temperature -40°C to +85°C
Package SOIC-8 (4.9 x 6.0 mm)

Features

  • Inverts or doubles input voltage from 1.5V to 5.5V at up to 200mA output
  • Selectable 20kHz or 150kHz oscillator frequency via FC pin
  • 86% conversion efficiency at 200mA with only 300uA operating current
  • 3.5 Ohm typical output resistance for low voltage drop
  • Only two external capacitors required, no inductors

Applications

  • Negative supply generation for op-amps and LCD bias
  • Positive voltage doubling for flash memory and portable devices
  • Battery-powered instruments requiring dual-rail supplies

The LM2662MX/NOPB from Texas Instruments (formerly National Semiconductor) is a CMOS charge-pump voltage converter that inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding negative voltage, or doubles the input voltage. Using only two low-cost external capacitors, the device provides up to 200mA of output current without the cost, size, and EMI associated with inductor-based converters. The typical output resistance is 3.5 Ohm, and conversion efficiency exceeds 86% at 200mA. The LM2662 features a Frequency Control (FC) pin that selects between 20kHz (FC open) and 150kHz (FC=V+) oscillator frequencies. The higher frequency allows smaller capacitors but increases supply current from 0.3mA to 1.3mA. The oscillator frequency can also be adjusted with an external capacitor on the OSC pin or driven by an external clock in inverter mode. The /NOPB suffix indicates lead-free packaging.

The LM2662MX/NOPB uses a switched-capacitor charge-pump architecture. (1) Inverter Mode: During phase 1, the flying capacitor C1 charges from VIN through internal switches. During phase 2, C1 is connected between ground and the output with reversed polarity, transferring charge to the output capacitor C2 and generating -VIN at the output. (2) Doubler Mode: During phase 1, C1 charges from VIN. During phase 2, C1 is connected in series with VIN, producing 2xVIN at the output. (3) Output Resistance: The effective output resistance Rout is determined by the on-resistance of the internal MOS switches (RSW), the oscillator frequency, and the ESR of C1 and C2. Rout = RSW + 2/(fosc x C1) + 4 x ESR(C1) + ESR(C2). (4) Frequency Selection: The FC pin selects between 20kHz and 150kHz. Higher frequency reduces the 2/(fosc x C1) term, allowing smaller capacitors for the same output resistance.

Pin Name Function
1 V+ Positive supply input
2 CAP+ Flying capacitor positive terminal
3 GND Ground
4 CAP- Flying capacitor negative terminal
5 OUT Negative voltage output (inverter mode)
6 LV Low voltage operation (ground for VIN<3.5V)
7 OSC Oscillator (ext cap or clock input)
8 FC Frequency control (open=20kHz, V+=150kHz)
  • Negative supply generation for dual-rail op-amp circuits from single 5V
  • LCD bias voltage generation in portable instruments
  • Positive voltage doubling for flash programming or white LED drive
Manufacturer Part Number Package Notes
TI LM2663MX/NOPB SOIC-8 With shutdown pin, 150kHz fixed
TI LMC7660IMX/NOPB SOIC-8 Lower cost, lower current
ADI ADM660ARZ SOIC-8 Pin-compatible, similar specs
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