Micrel, Inc.

MIC22601

May 2009

2

M9999-050509-A

Ordering Information

Part Number

Voltage

Junction Temp. Range

Package

Lead Finish

MIC22601YML

Adj.

–40° to +125°C

24-Pin 4x4 MLF

®

Pb-Free

Note

: MLF

Pin Configuration

PVIN

EN

DELAY

RC

POR

PVIN

PVIN

SVIN

SGND

COMP

FB

PVIN

EP

24-Pin 4mm x 4mm MLF

Pin Description

Pin Number

Pin Name

Pin Name

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): This pin has a 1.24V band gap reference. When

the pin is pulled higher than this 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: A capacitor-to-ground from this pin determines the slew

rate of the 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, refer to the 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. High when the Power is Good

7, 12, 19, 24

PGND

Power Ground (Signal): Ground

16

SGND

Signal Ground (Signal): Ground

3

DELAY

Delay (Input): Add a capacitor to set the delay from FB reaching 90%

nominal to POR asserting high.

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.