MIC22600_09 datasheet(3/29 Pages) MICREL

3 / 29 page

Micrel, Inc.

MIC22600

October 2009

M9999-102809-C

Pin Description

Pin Number

MLF-24

Pin Number

TSSOP-24

Pin Name

Description

1, 6, 13, 18

3, 10, 15, 22

PVIN

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

SVIN

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

EN/DLY

EN/DLY (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 voltage.

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. RC pin cannot be left floating. Use a minimum capacitor value of 220pF or

larger.

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

network to set the output voltage.

COMP

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

see applications section.

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

4, 9, 16, 21

PGND

Power Ground (Signal): Ground

SGND

Signal Ground (Signal): Ground

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

5, 6, 7, 8,

17, 18 19, 20

Switch (Output): Internal power MOSFET output switches.

GND

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

power to be realized.

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