Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1955/MAX1956
Edited by the Electronicstalk Editorial Team on 27 January 2003
Top accuracy for dual-output DC/DC
controllers
The MAX1955 and MAX1956 are low-input-voltage high-accuracy step-down DC/DC controllers for cellular basestations, storage, network and telecomms systems.
The MAX1955 and MAX1956 are low-input-voltage high-accuracy step-down DC/DC controllers for cellular basestations, storage, network and telecomms systems These DC/DC controllers simplify designs that have 1.6 to 5.5V available to generate lower voltage core and I/O supplies for DSPs, microprocessors, ASICs, and FPGAs
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX1955/MAX1956 include a step-up bias supply generator with dual step-down controllers.
When operating at voltages lower than 5V, the bias step-up regulator generates 5V output to power the step-down controllers and drive external, low-cost N-channel mosfets to improve power conversion efficiency.
The MAX1956 operates from 1.6 to 5.5V input, and the MAX1955 operates from 2.25 to 5.5V input.
Both controllers generate outputs down to 0.8V, and digital soft-start reduces inrush current.
Selectable power sequencing and digital soft-stop simplify power-sequencing designs.
For noise-sensitive applications, both controllers can be synchronised to an external clock.
The MAX1955/MAX1956 feature adjustable, lossless current limit by sensing the drain-to-source voltage of the external N-channel mosfets.
Foldback current limit reduces power dissipation during short circuit.
Unlike devices featuring hiccup-mode short-circuit protections, the MAX1955/MAX1956's foldback current limit prevents the output from dropping during short-duration transient overloads.
The MAX1955ETI and MAX1956ETI come in 5 x 5mm, 28-pin thin QFN packages.
Prices for the MAX1955ETI start at $2.99 (1000-up, FOB USA).
Both devices are specified for the extended-industrial temperature range (-40 to +85C).
Evaluation kits and several application circuits are available to speed designs.
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