Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX5060 and MAX5061
Edited by the Electronicstalk Editorial Team on 06 April 2005
Controllers cut high-current supplies
down to size
The MAX5060 and MAX5061 are PWM buck controllers that allow the design of high-output-current, compact power supplies with a minimum number of external components.
The MAX5060 and MAX5061 are PWM buck controllers that allow the design of high-output-current, compact power supplies with a minimum number of external components The devices' internal voltage regulators allow operation from a 5, 12 or 24V power bus, while the output voltage is adjustable from 0.6 to 5.5V
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX5060 and MAX5061 are well suited for applications requiring up to 30A output current.
Multiple DC/DC controller modules can, moreover, be paralleled to achieve higher output currents.
Both devices include an average-current-mode control scheme, which allows designers to achieve current-limit as well as current-sharing accuracy of typically +/-10%.
This capability results in a small inductor and small, or fewer, external MOSFETs, thus reducing power-supply size and cost.
An external current-sense resistor ensures that +/-10% (typical) current-sharing accuracy is maintained between paralleled modules.
The current-sense threshold for both devices is only 25mV, which reduces power dissipation in the sense resistor and allows use of a smaller sense resistor (2010 size resistor for a 20A power supply) than competing solutions.
The MAX5060 and MAX5061 also limit reverse-current sinking, thus preventing the main power bus (VBUS) from being pulled down when multiple power-supply modules are paralleled.
Both the MAX5060 and MAX5061 include on/off input and external frequency synchronisation.
Switching frequency is externally programmable from 125kHz to 1.5MHz, thus allowing power-supply designers to optimise power-supply size and efficiency.
The MAX5060 includes additional features: a clock-output signal to drive a second DC/DC convertor 180 degrees out-of-phase; a load-monitoring output voltage proportional to the output current; power-good output; overvoltage protection; and differential remote-sense pins to ensure precise voltage at the load.
A 20A power-supply evaluation kit that measures 42 x 23mm and achieves 96% peak efficiency is available from the company.
The MAX5060 and MAX5061 operate over the -40 to +125C temperature range.
The MAX5060 is available in a thermally enhanced 28-pin TQFN and priced at $1.66, and the MAX5061 is available in a 16-pin TSSOP package and priced at $1.44 (1000-up, FOB USA).
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