Compact outline for six- and seven-output control

The MAX1586A, MAX1586B and MAX1587A are billed as the smallest, most efficient power-management ICs optimised for devices using Intel X-Scale microprocessors.

The MAX1586A, MAX1586B and MAX1587A are billed as the smallest, most efficient power-management ICs optimised for devices using Intel X-Scale microprocessors.

Applications include third-generation smart cellphones, PDAs, Internet appliances, and other portable devices requiring substantial computing and multimedia capability at low power.

The MAX1586 and MAX1587 feature ultra-high-performance step-down convertors with 1MHz synchronous rectification that eliminates external diodes, thus saving cost and size.

These ICs integrate seven high-performance, low-operating-current power supplies along with supervisory and management functions.

The DC/DC I/O supply can be preset to 3.3 or 3.0V, or adjusted to other values, with currents up to 1.3A.

The DRAM supply on the MAX1586A and MAX1587A is preset for 1.8 or 2.5V, whereas the MAX1586B DRAM supply is preset for 3.3 or 2.5V, providing up to 900mA.

The DRAM supply on all parts can also be adjusted with external resistors.

The CPU core supply is serially programmed for dynamic voltage management and delivers 500mA.

Linear-regulated outputs are provided for SRAM, PLL, and USIM supplies.

To minimise sleep-state quiescent current, I/O and DRAM supplies have bypass "sleep" LDOs.

These LDOs can be activated to minimise battery drain when output current is very low, thus achieving a quiescent current of only 60uA.

In addition, all DC/DC outputs operate with fixed-frequency PWM control and automatically switch from PWM to skip-mode operation at light loads to extend battery life.

Other functions include separate on/off control for all DC/DC convertors, low-battery and dead-battery detection, reset and power-OK outputs, and a backup battery input.

A 2.6 to 5.5V input-voltage range allows the use of a single-cell lithium-ion (Li+), three-cell NiMH or a regulated 5V input.

The MAX1586A and MAX1586B each feature an additional linear regulator (V6) for VCC USIM and low-battery and dead-battery comparators.

The MAX1587A is available in the smaller 6 x 6mm, 40-pin thin QFN package, and the MAX1586 is available in a 7 x 7mm, 48-pin thin QFN package.

The parts are screened for the extended temperature range (-40 to +85C).

Prices start at $5.80 (1000-up, FOB USA).

An evaluation kit is available to speed designs.

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