Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1958 and MAX1959
Edited by the Electronicstalk Editorial Team on 05 December 2002
More talk time with power amplifier
management ICs
The MAX1958 and MAX1959 are power management ICs used to power HBT power amplifiers in WCDMA and NCDMA cellular handsets, wireless PDAs, and wireless modems.
The MAX1958 and MAX1959 are cellphone power amplifier power management ICs that integrate an 800mA dynamically adjustable (0.75 to 3.6V in 30us) step-down DC/DC convertor, a 5mA rail-rail bias amplifier, and a precision temperature sensor to power HBT PAs in WCDMA and NCDMA cellular handsets, wireless PDAs, and wireless modems The parts switch at a fixed 1MHz to reduce external component size
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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All this capability comes in a 5 x 5mm thin QFN package, making these ICs the smallest and most efficient PMICs to power the PA in WCDMA and NCDMA applications.
The MAX1958/MAX1959 include a low on-resistance internal mosfet switch and synchronous rectifier to maximise efficiency and minimise external component count.
No external diode is needed.
The 100% duty-cycle operation allows a dropout voltage of only 130mV at 600mA, giving 97% efficient power transfer.
The input voltage range is 2.6 to 5.5V.
The output has 2% tolerance.
The MAX1958 has a dynamically adjustable output voltage range of 0.75 to 3.4V with 1.76x gain.
The MAX1959's output voltage range is 1 to 3.6V with 2x gain and DC offset.
To maximise efficiency, both feature a micropower operational amplifier as a variable bias to the HBT PA.
They also provide active discharge in shutdown, a +/-2.5degC precision temperature sensor with a -11.7mV/degC slope, and built-in soft-start to limit startup currents.
The MAX1958ETP/MAX1959ETP are available in space-saving 20-pin thin-QFN packages screened for the extended industrial temperature range (-40 to +85C).
Prices start at $2.25 (1000-up, FOB USA).
An evaluation kit is available to speed designs.
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