Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8595 and MAX8596
Edited by the Electronicstalk Editorial
Team on 30 September 2004
Drivers produce more light from fewer
LEDs
The MAX8595 and MAX8596 are 36V step-up DC/DC convertors that power up to eight LEDs in a series at 25mA.
The MAX8595 and MAX8596 are 36V step-up DC/DC convertors that power up to eight LEDs in a series at 25mA The MAX8596 automatically adjusts its output current based on the ambient temperature, so that it delivers the maximum recommended LED current (based on the derating curves of popular white LEDs) at all temperatures
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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In noncompensated designs, users have to limit the LED current at room temperature - and therefore use more LEDs to get the desired brightness - to a level low enough to ensure safety at higher temperatures.
With the MAX8596, the LED current reduces automatically at higher temperatures.
Consequently, the user can safely run higher currents at room temperature and use up to 33% fewer LEDs, saving cost and space.
Fast 1MHz, current-mode PWM operation allows for a small inductor and output capacitor while minimising ripple on the input supply/battery.
Efficiency is a high 86%, and the input voltage range is 2.6 to 5.5V.
Whereas competing products require two resistors and a capacitor to adjust brightness, the MAX8595 and MAX8596 provide flexible dimming control with an analogue or digital PWM input without additional components.
Other DC/DC convertor features include internal soft-start to reduce inrush current, low input ripple, and a 0.3uA shutdown current to maximise battery life.
Both devices are available in space-saving 3 x 3mm, 8-pin TDFN packages screened for the -40 to +85C temperature range.
The devices are pin-to-pin compatible with the popular MAX1561 and MAX1599.
Prices start at $1.45 (1000-up, FOB USA).
To speed designs, the MAX1561EVKIT (evaluation kit) can be used to evaluate both devices.
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