Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX5096 and MAX5097
Edited by the Electronicstalk Editorial Team on 13 September 2006
Buck convertors work as LDOs
Two easy-to-use 40V-input dual mode buck convertors incorporate a user-selectable low-dropout mode.
Maxim Integrated Products introduces the MAX5096 and MAX5097 easy-to-use, 40V input, dual mode buck convertors with user-selectable low-dropout (LDO) mode At a high-output load, the convertors reduce power dissipation by operating as high-efficiency, pulsewidth modulated (PWM) switch-mode buck convertors
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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During a key-off condition, the system's microcontroller drives the LDO or buck input pin on-the-fly and forces the change to LDO mode, thus reducing the quiescent current (IQ).
For example, the quiescent current is only 41uA at 100uA load in LDO mode.
The flexible configuration, low IQ operation, protection features, and thermal enhancement make these convertors ideal for low-cost, compact, automotive DC/DC applications.
In buck mode, the MAX5096 and MAX5097 operate from a 5 to 40V input-voltage range and deliver up to 600mA of load current with excellent load and line regulation.
In LDO mode, these convertors operate from a 4V cold crank to 40V input voltage.
LDO mode operation is intended for a lower output load current (up to 100mA).
These devices operate at a fixed-switching frequency of 135kHz (MAX5096) or 330kHz (MAX5097).
In addition, the convertors' internal DC/DC convertor clock can be synchronised to an external clock.
The devices use external compensation, which allows the use of low-cost inductors and output capacitors while optimising loop stability.
Additional features include current-mode control for ease of design, power-on reset output with a capacitor-adjustable timeout period, programmable soft-start, output tracking, output overload, and short-circuit/ thermal-shutdown protections.
The MAX5096 and MAX5097 operate over the -40 to +125C automotive temperature range, and are available in thermally enhanced 20-pin TSSOP and 16-pin TQFN packages.
Prices start at US $2.74 (1000-up, FOB USA).
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