Micrel, Inc.

MIC2800

September 2007

3

M9999-090507-C

Pin Configuration

3mm x 3mm MLF

Fixed DC/DC Converter Output Voltage

Pin Description

Pin Number

Pin Name

Pin Function

1

_____

LOWQ

LOWQ Mode. Active Low Input. Logic High = Full Power Mode; Logic Low =

LOWQ Mode; Do not leave floating.

2

BIAS

Internal circuit bias supply. It must be de-coupled to signal ground with a 0.1µF

capacitor and should not be loaded.

3

SGND

Signal ground.

4

PGND

Power ground.

5

SW

Switch (Output): Internal power MOSFET output switches.

6

Supply Input – DC/DC. Must be tied to PIN7 externally.

7

Supply Input – LDO2. Must be tied to PIN6 externally.

8

LDO2

Output of regulator 2

9

FB

output voltage

10

LDO

11

LDO1

Output of regulator 1

12

POR

Power-On Reset Output: Open-drain output. Active low indicates an output

undervoltage condition on either one of the three regulated outputs.

13

Delay Set Input: Connect external capacitor to GND to set the internal delay for the

POR output. When left open, there is minimum delay. This pin cannot be grounded.

14

Reference Bypass: Connect external 0.1µF to GND to reduce output noise. May be

left open.

15

EN1

Enable Input (DC/DC and LDO1). Active High Input. Logic High = On; Logic Low =

Off; Do not leave floating.

16

EN2

Enable Input (LDO 2). Active High Input. Logic High = On; Logic Low = Off; Do not

leave floating