Micrel, Inc.

MIC22700

July 2009

2

M9999-072209-B

Ordering Information

Part Number

Voltage

Junction Temp. Range

Package

Lead Finish

MIC22700YML

Adj.

–40° to +125°C

24-Pin 4x4 MLF

®

Pb-Free

Note:

MLF

Pin Configuration

PVIN

EN

DELAY

RC

POR/PG

PVIN

PVIN

SVIN

SGND

COMP

FB

PVIN

EP

24-Pin 4mm x 4mm MLF

Pin Description

Pin Number

Pin Name

Description

1, 6, 13, 18

PVIN

Power Supply Voltage (Input): Requires bypass capacitor to GND.

17

SVIN

Signal Power Supply Voltage (Input): Requires bypass capacitor-to-GND.

2

EN

Enable/Delay (Input): When this pin is pulled higher than the enable threshold, the

part will start up. Below this voltage the device is in its low quiescent current

mode. The pin has a 1µA current source charging it to VIN. By adding a capacitor

to this pin a delay may easily be generated. The enable function will not operate

with an input voltage lower than the min specified.

4

RC

Ramp Control: Capacitor to ground from this pin determines slew rate of output

voltage during start-up. This can be used for tracking capability as well as soft

start.

14

FB

Feedback: Input to the error amplifier, connect to the external resistor divider

network to set the output voltage.

15

COMP

Compensation pin (Input): Place a RC to GND to compensate the device, see

applications section.

5

POR/PG

Power On Reset (Output): Open-drain output device indicates when the output is

out of regulation and is active after the delay set by the delay pin.

7, 12, 19, 24

PGND

Power Ground: Ground

16

SGND

Signal Ground: Ground

3

DELAY

Delay (Input): Capacitor to ground sets internal delay timer. Timer delays power-

on reset (POR) output at turn-on and ramp down at turn-off.

8, 9, 10, 11,

20, 21, 22, 23

SW

Switch (Output): Internal power MOSFET output switches.

EP

GND

Exposed Pad (Power): Must make a full connection to a GND plane for full output

power to be realized.