Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX5092
Edited by the Electronicstalk Editorial
Team on 16 January 2007
LDO adds preregulator for wider input
range
Maxim Integrated Products has released the MAX5092 low-quiescent-current, low-dropout (LDO) regulator with a boost preregulator.
Maxim Integrated Products has released the MAX5092 low-quiescent-current, low-dropout (LDO) regulator with a boost preregulator The device provides a regulated 3.3V (MAX5092A), 5V (MAX5092B), or adjustable output voltage from a 3.5 to 72V input voltage
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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This wide operating-input-voltage range allows for true buck-boost operation and provides uninterrupted power during key-off, cold-crank, and load-dump conditions in a harsh automotive environment.
The MAX5092 also significantly reduces the size and cost of large bulk capacitors commonly used at the input of the electronic control units (ECUs) to ride through the "cold-crank" duration.
The LDO regulator is capable of providing up to a 250mA output current, and it consumes only 65uA when the battery is healthy and the boost preregulator is completely turned off.
In shutdown mode the MAX5092's quiescent current drops to 5uA.
The boost preregulator output voltage is preset to 7V and can be externally adjusted up to 11V, while the LDO regulator output voltage can be adjusted from 1.5 to 9V.
When the voltage at the input of the MAX5092 drops below the desired boost-convertor output voltage, the boost convertor is enabled and provides a boosted output voltage to power the LDO regulator.
The buck-boost operation achieved by this combination of LDO and boost preregulator significantly reduces component count and size, thus saving space and cost.
Further cost and space savings are achieved by the MAX5092's high level of integration.
This device integrates a blocking diode and needs no external boost convertor.
It also has a power-on-reset circuit with an externally programmable timeout period and includes output-overload, short-circuit and thermal protection.
The MAX5092 is specified for operation over the -40 to +125C automotive temperature range and is available in a thermally enhanced, 5 x 5mm, 16-pin TQFN package capable of dissipating 2.7W at an ambient temperature of +70C.
Prices start at US $1.48 (1000-up, FOB USA).
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