Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1577Z and MAX1577Y
Edited by the Electronicstalk Editorial Team on 18 November 2004
LED charge pumps
save need for convertors
The MAX1577Z and MAX1577Y are high-efficiency 1x/2x charge pumps that can drive white LEDs with regulated current up to 1.1A (800mA guaranteed)
By using a proprietary adaptive-mode switching technique, the charge pumps provide high efficiency (up to 92%) in movie mode or backlighting. The very-low, open-loop output resistance allows the highest WLED flash brightness, even from a low battery input voltage. Requiring only three tiny ceramic capacitors, these devices eliminate the need for a step-up DC/DC convertor and low-profile inductor, which ensures that the parts meet the height constraints in clamshell cellphones.
This article was originally published on Electronicstalk on 18 November 2004 at 8.00am (UK)
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Fast 1MHz switching allows the use of tiny external components.
The regulation scheme is optimised to ensure low EMI and low input ripple.
The MAX1577Z and MAX1577Y use an external resistor to set the full-scale LED current.
Two enable inputs provide simple on/off control and LED current of 20, 33 or 100% full-scale.
The charge pumps also feature soft-start to limit inrush current, thermal-shutdown, and complete input-to-output disconnect during shutdown (0.1uA shutdown current).
The input voltage range is 2.7 to 5.5V.
The MAX1577Z has fixed 5.1V output overvoltage protection.
The MAX1577Y has logic-controlled output current for flash, and 3.4, 4.6 or 5.1V output voltages for backlight, keyboard, and RGB applications.
The MAX1577Z and MAX1577Y are available in space-saving, 8-pin, 3 x 3mm TDFN packages, screened for the industrial temperature range (-40 to +85C).
Prices start at $1.80 (2500-up, FOB USA).
An evaluation kit (MAX1577EVKIT) is available to speed designs.
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