Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8500/MAX8503/MAX8504
Edited by the Electronicstalk Editorial
Team on 19 November 2002
Handset power chips boost battery life
Maxim Integrated Products has released its second generation of step-down DC/DC convertors designed specifically for the linear power amplifier used in 2.5G and 3G cellular phones.
Maxim Integrated Products has released its second generation of step-down DC/DC convertors designed specifically for the linear power amplifier used in 2.5G and 3G cellular phones The high-speed MAX8500 and MAX8503 can vary their output voltage from 0.4 to 3.4V in less than 30us, thereby adjusting the power applied to the PA
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX8504 is programmed for fixed 1.25 to 2.5V output with external resistors.
The MAX8500/MAX8503/MAX8504 are pulsewidth modulated (PWM) convertors with a 1MHz switching frequency and can deliver up to 600mA.They have an input range of 2.6 to 5.5V for use with a single lithium-ion battery.
They integrate a bypass FET (0.25ohm typical), allowing operation directly from the battery at heavy loads.
For light loads, the MAX8500 and MAX8503 use an LDO regulator to bypass the external inductor to eliminate switching losses.
The MAX8500/MAX8503/MAX8504 can operate up to 100% duty cycle.
Dropout is only 150mV at 600mA load to give longer useful operating life to the battery.
Quiescent supply current is only 280uA and drops to 0.1uA in logic-controlled shutdown.
The MAX8500/MAX8503/MAX8504 come in a 0.8mm high 12-pin thin QFN package (4 x 4mm).
The ICs are screened for the extended industrial temperature range (-40 to +85C).
Prices start at $2.15 (1000-up, US recommended resale).
An evaluation kit is available to speed designs.
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