Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX857x family
Edited by the Electronicstalk Editorial Team on 06 September 2004
Convertors are biased about display
duties
A new family of high-efficiency step-up convertors provides LCD and OLED display bias in PDAs, digital stills cameras, mobile phones, palmtop computers and other handheld portable equipment.
A new family of high-efficiency step-up convertors provides LCD and OLED display bias in PDAs, digital stills cameras, mobile phones, palmtop computers and other handheld portable equipment The convertors operate from a 2.7 to 5.5V supply voltage and have an internal switch that delivers up to 28V at the output
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX857x family offers up to 87% efficiency and only 25uA quiescent current in light-load conditions.
Each device includes an extra internal switch to provide true shutdown, completely disconnecting the output from the input supply when the device is not active.
The MAX857x convertors address the long-standing problem of display damage resulting from runaway output for high-voltage boost convertors.
Protection features make these ICs extremely robust.
For example, if the output capacitor or one of the feedback resistors is disconnected or missing, the devices protect the internal switch from being damaged.
In fact, in response to most fault conditions, the MAX8570 family protects not only itself but also the downstream circuitry.
The MAX8570 family is offered with 110, 250 and 500mA current limits in both adjustable and fixed output voltages.
This allows designers to select the best device to minimise output ripple and component size, and maximise efficiency for their specific application.
The MAX857x family is specified for the extended temperature range (-40 to +85C) and packaged in a 6-pin SOT23.
Evaluation kits are available with recommended external components to speed designs.
Prices start at $1.25 (1000-up, FOB USA).
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