MIC39500-2.5BT(1999) Ver la hoja de datos (PDF) - Micrel

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MIC39500-2.5BT
(Rev.:1999)

5A Low-Voltage Low-Dropout Regulator

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MIC39500/39501

an input as low as 3.0V. This gives PNP-based regulators a

distinct advantage over older, NPN-based linear regulators.

A typical NPN regulator does not have the headroom to do

this conversion.

Minimum Load Current

The MIC39500/1 regulator is specified between finite loads.

If the output current is too small, leakage currents dominate

and the output voltage rises. A 10mA minimum load current

is necessary for proper regulation.

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Error Flag

The MIC39501 version features an error flag circuit which

monitors the output voltage and signals an error condition

when the voltage 5% below the nominal output voltage. The

error flag is an open-collector output that can sink 10mA

during a fault condition.

Low output voltage can be caused by a number of problems,

including an overcurrent fault (device in current limit) or low

input voltage. The flag is inoperative during overtemperature

shutdown.

Enable Input

The MIC39501 version features an enable input for on/off

control of the device. Its shutdown state draws “zero” current

(only microamperes of leakage). The enable input is TTL/

CMOS compatible for simple logic interface, but can be

connected to up to 20V.

MIC39500/39501

6

June 1999

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