Top

High-Frequency, Regulated, 200mA, Inverting Charge Pump

Regulated Inverting Charge Pump Delivers 200mA for Negative Supply without Inductors

Product Details

The MAX889 inverting charge pump delivers a regulated negative output voltage at loads of up to 200mA. The device operates with inputs from 2.7V to 5.5V to produce an adjustable, regulated output from -2.5V to -VIN.

The MAX889 is available with an operating frequency of 2MHz (T version), 1MHz (S version), or 0.5MHz (R version). The higher switching frequency devices allow the use of smaller capacitors for space-limited applications. The lower frequency devices have lower quiescent current.

The MAX889 also features a 0.1µA logic-controlled shutdown mode and is available in an 8-pin SO package. An evaluation kit, MAX889SEVKIT, is available.

Key Features

  • 200mA Output Current
  • Up to 2MHz Switching Frequency
  • Small Capacitors (1µF)
  • +2.7V to +5.5V Input Voltage Range
  • Adjustable Regulated Negative Output (-2.5V to -VIN)
  • 0.1µA Logic-Controlled Shutdown
  • Low 0.05Ω Output Resistance (in regulation)
  • Soft-Start and Foldback Current Limited
  • Short-Circuit and Thermal Shutdown Protected
  • 8-Pin SO Package

Applications/Uses

  • Battery-Powered Applications
  • Camcorders
  • Digital Still Cameras
  • Hard Disk Drive
  • Measurement Instrumentation
  • TFT Panels
Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT (A) (typ) 0.2
Unadj. VOUT (V) -VIN
Adj. VOUT (V) (min) -VIN
Adj. VOUT (V) (max) -2.5
ICC (mA) (max) 7
Switching Frequency (kHz) 500
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC(N)/8
Budgetary
Price (See Notes)
$2.22 @1k
View More

Simplified Block Diagram

MAX889: Typical Operating Circuit MAX889: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX889 IC is an inverting charge pump that delivers a regulated negative output voltage at loads up to 200mA. The device operates from an input of +2.7V to +5.5V to produce a user-adjustable, regulated output of -2.5V to -VIN.

The MAX889S evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The board is set up to provide a -3.3V output from a +5.0V input supply. The EV kit is shipped with a MAX889S (1MHz switching frequency) installed. The board may also be used to evaluate the MAX889R (500kHz) or the MAX889T (2MHz). To do so, request a free sample of the MAX889RESA or MAX889TESA, and refer to the MAX889 data sheet for the appropriate capacitor values.

View Details

Features

  • +2.7V to +5.5V Input Range
  • Uses One 2.2µF and Two 10µF Ceramic Capacitors
  • Output Adjustable from -2.5V to -VIN
  • 200mA Output Current
  • 1MHz Switching Frequency
  • Fully Assembled and Tested Surface-Mount Board

/en/design/design-tools/ee-sim.html?

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

Parameters

Parametric specs for Charge Pumps
Topology Inverter
Regulated
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT (A) (typ) 0.2
Unadj. VOUT (V) -VIN
Adj. VOUT (V) (min) -VIN
Adj. VOUT (V) (max) -2.5
ICC (mA) (max) 7
Switching Frequency (kHz) 500
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC(N)/8
Budgetary
Price (See Notes)
$2.22 @1k

Key Features

  • 200mA Output Current
  • Up to 2MHz Switching Frequency
  • Small Capacitors (1µF)
  • +2.7V to +5.5V Input Voltage Range
  • Adjustable Regulated Negative Output (-2.5V to -VIN)
  • 0.1µA Logic-Controlled Shutdown
  • Low 0.05Ω Output Resistance (in regulation)
  • Soft-Start and Foldback Current Limited
  • Short-Circuit and Thermal Shutdown Protected
  • 8-Pin SO Package

Applications/Uses

  • Battery-Powered Applications
  • Camcorders
  • Digital Still Cameras
  • Hard Disk Drive
  • Measurement Instrumentation
  • TFT Panels

Description

The MAX889 inverting charge pump delivers a regulated negative output voltage at loads of up to 200mA. The device operates with inputs from 2.7V to 5.5V to produce an adjustable, regulated output from -2.5V to -VIN.

The MAX889 is available with an operating frequency of 2MHz (T version), 1MHz (S version), or 0.5MHz (R version). The higher switching frequency devices allow the use of smaller capacitors for space-limited applications. The lower frequency devices have lower quiescent current.

The MAX889 also features a 0.1µA logic-controlled shutdown mode and is available in an 8-pin SO package. An evaluation kit, MAX889SEVKIT, is available.

Simplified Block Diagram

MAX889: Typical Operating Circuit MAX889: 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