MIC37139(2003) View Datasheet(PDF) - Micrel

Part Name

Description

Manufacturer

MIC37139
(Rev.:2003)

1.5A, Low-Voltage µCap LDO Regulator

Micrel 

MIC37139

By virtue of its low-dropout voltage, this device does not

saturate into dropout as readily as similar NPN-based de-

signs. When converting from 3.3V to 2.5V, 2.5V to 1.8V or

1.65V, or 2.5V to 1.5V, the NPN-based regulators are already

operating in dropout, with typical dropout requirements of

1.2V or greater. To convert down to 2.5V without operating in

dropout, NPN-based regulators require an input voltage of

3.7V at the very least. The MIC37139 regulator will provide

excellent performance with an input as low as 3.0V or 2.25V,

respectively. This gives the PNP-based regulators a distinct

advantage over older, NPN-based linear regulators.

Micrel

Minimum Load Current

The MIC37139 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 operation.

November 2003

9

M9999-112003

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