Regulated, 125mA Output, Charge Pump DC-DC Inverter

Flexible Control Scheme -Fixed Frequency or Low Quiescent Current Modes

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The MAX1673 charge-pump inverter provides a low-cost, compact means of generating a regulated negative output from a positive input at up to 125mA. It requires only three small capacitors, and only two resistors to set its output voltage. The input range is 2V to 5.5V. The regulated output can be set from 0V to -VIN in Skip regulation mode or -1.5V to -VIN in Linear (LIN) regulation mode.

In Skip mode, the MAX1673 regulates by varying its switching frequency as a function of load current. This On-Demand™ switching gives the MAX1673 two advantages: very small capacitors and very low quiescent supply current. At heavy loads, it transfers energy from the input to the output by switching at up to 350kHz. It switches more slowly at light loads, using only 35µA quiescent supply current.

In Linear mode, the MAX1673 switches at a constant 350kHz at all loads and regulates by controlling the current-path resistance. This provides constant-frequency ripple, which is easily filtered for low-noise applications.

This device also features a 1µA logic-controlled shutdown mode and is available in a standard 8-pin SO package. For a device that delivers about 10mA and fits in a smaller package, refer to the MAX868.
MAX1673: Typical Operating Circuit MAX1673: Typical Operating Circuit Enlarge+

Key Features

  • Regulated Negative Output Voltage (up to -1 x VIN)
  • 125mA Output Current
  • 35µA Quiescent Supply Current (Skip-mode regulation)
  • 350kHz Fixed-Frequency, Low-Noise Output (Linear-mode regulation)
  • 2V to 5.5V Input Range
  • 1µA Logic-Controlled Shutdown


  • Analog Signal Processing
  • Camcorders
  • Digital Still Cameras
  • Hard Disk Drive
  • Measurement Instrumentation
  • Modems

See parametric specs for Charge Pumps (45)

Part NumberTopologyVIN
Unadj. VOUT
Oper. Freq.
Oper. Temp.
minmaxmaxminmaxtypSee Notes
25.516-VIN-VIN00.125350-40 to +85
SOIC (N)/8
$2.13 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX1673.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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