MAX843ISA+

MAX843ISA+

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MAX843ISA+
IC REG CHARGE PUMP 1OUT 8SOIC
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MAX843ISA+ Products
The MAX840/MAX843/MAX844 low-noise, inverting charge-pump power supplies are ideal for biasing GaAsFETs in cellular telephone transmitter amplifiers. They operate with inputs down to 2.5V. The MAX840 offers both a -2V preset output and a -0.5V to -9.4V adjustable output. The MAX843/MAX844 use an external positive control voltage to set the negative output voltage. Input voltage range for all the devices is 2.5V to 10V, and output current is 4mA with VIN > 2.7V. These circuits can operate with small capacitors, as low as 0.22μF. An internal linear regulator reduces the MAX840's output voltage ripple to 1mVp-p. With a well-filtered control voltage (VCTRL), the MAX843/MAX844 also achieve less than 1mVp-p typical output ripple. Supply current is 750μA, and reduces to less than 1μA in shutdown (MAX840/MAX843). The MAX844's unregulated output is active in shutdown, with the charge pump switching at 20kHz. It provides a low-power LCD supply.

Feature

  • Fixed -2V or Adjustable -0.5V to -9.4V Output at 4mA (MAX840)
  • 2.5V to 10V Input Voltage Range
  • Operate with Small Capacitors (as low as 0.22μF)
  • 1mVp-p Output Voltage Ripple
  • Charge-Pump Switching Frequency:
    • 100kHz in Normal Operation
    • 20kHz in Shutdown Mode (MAX844)
  • 1μA Max Logic-Level Shutdown Over Temp. (MAX840/MAX843)
  • Small 8-Pin SO Package

Applications

  • Cell Phones
  • Continuously Adjustable GaAsFET Bias
  • GaAsFET Power Amplifier Modules
  • LCD-Bias Contrast Control
  • Personal Communicators, PDAs
  • Regulated Negative Power Supplies
  • Wireless Data Loggers

Product Attributes

TYPE DESCRIPTION Select all
Voltage - Input 2.5V ~ 10V
Number of Outputs 1
Voltage - Output -2V
Operating Temperature -25°C ~ 85°C
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Supplier Device Package 8-SOIC
Package Tube
Product Status Active
Applications Charge Pump, Cellular Telephone Transmitter

$0.55

Price update:a months ago
Available in stock: 4937
Analog Devices Inc./Maxim Integrated

Analog Devices Inc./Maxim Integrated

Maxim Integrated has amalgamated with Analog Devices, imparting an augmented repertoire of superlative mixed-signal and power governance innovations, fostering clientele triumph across diverse sectors. This amalgamation begets a spectrum of resolutions for surmounting the utmost intricate quandaries, spanning from direct current to the expanse of 100 gigahertz, encompassing miniscule nanowatt realms to robust kilowatt domains, spanning the sensor continuum to the ethereal expanse of cloud. Delve deeper into Analog Devices' enriched assemblage on their product dossier.

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