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

Flexible Control Scheme -Fixed Frequency or Low Quiescent Current Modes

Product Details

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.

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

Applications/Uses

  • Analog Signal Processing
  • Camcorders
  • Digital Still Cameras
  • Hard Disk Drive
  • Measurement Instrumentation
  • Modems
Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2
VIN (V) (max) 5.5
IOUT (A) (typ) 0.125
Unadj. VOUT (V) -VIN
Adj. VOUT (V) (min) -VIN
Adj. VOUT (V) (max) 0
ICC (mA) (max) 16
Switching Frequency (kHz) 350
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.13 @1k
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Simplified Block Diagram

MAX1673: Typical Operating Circuit MAX1673: Typical Operating Circuit Zoom icon

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Parameters

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2
VIN (V) (max) 5.5
IOUT (A) (typ) 0.125
Unadj. VOUT (V) -VIN
Adj. VOUT (V) (min) -VIN
Adj. VOUT (V) (max) 0
ICC (mA) (max) 16
Switching Frequency (kHz) 350
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.13 @1k

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX1673: Typical Operating Circuit MAX1673: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal