Micrel, Inc.

MIC5373/83

July 2010

3

M9999-070110

Pin Description

Pin Number

Pin Name

Pin Function

1

OUT1

Regulator Output - LDO1.

2

INLDO1/2

Supply Input (LDO1/2).

3

OUT2

Regulator Output – LDO2.

4

BIAS

Internal Bias Supply Voltage. Must be de-coupled to ground with a 0.1µF capacitor.

5

POR_IN

Input to POR. Connect directly to output voltage or input voltage that is to be monitored for a 0.9V

reference, or connect a resistor divider network to this pin to program the POR monitoring voltage.

6

POR

Power-on Reset Output. Open drain.

7

DLY

POR Delay. Connect capacitor to ground to set POR delay time.

8

MR

Manual Reset Input. Manually resets output of POR and delay generator. Do not leave floating.

9

NC

Not internally connected.

10

NC

Not internally connected.

11

INLDO3

Supply Input (LDO3).

12

OUT3

Regulator Output – LDO3.

13

GND

Ground.

14

EN3 or /EN3

LDO3 Enable Input. EN (MIC5373): Active High Input. Logic High = On; Logic Low = Off;

/EN (MIC5383): Active Low Input. Logic High = Off; Logic Low = On; Do not leave floating.

15

EN2 or /EN2

LDO2 Enable Input. EN (MIC5373): Active High Input. Logic High = On; Logic Low = Off;

/EN (MIC5383): Active Low Input. Logic High = Off; Logic Low = On; Do not leave floating.

16

EN1 or /EN1

LDO1 Enable Input. EN (MIC5373): Active High Input. Logic High = On; Logic Low = Off;

/EN (MIC5383): Active Low Input. Logic High = Off; Logic Low = On; Do not leave floating.

HS Pad

EPAD

Exposed Heat Sink Pad. Connect to GND.