Micrel, Inc.

MIC2225

October 2007

2

M9999-101107-B

Ordering Information

Part Number

Voltage

Temperature Range

Package

Lead Finish

MIC2225-4MYMT

1.2V/2.8V

–40° to +125°C

10-Pin 2x2 Thin MLF

®

Pb-Free

MIC2225-4SYMT

1.2V/3.3V

–40° to +125°C

10-Pin 2x2 Thin MLF

®

Pb-Free

MIC2225-G4YMT

1.8V/1.2V

–40° to +125°C

10-Pin 2x2 Thin MLF

®

Pb-Free

MIC2225-GFYMT

1.8V/1.5V

–40° to +125°C

10-Pin 2x2 Thin MLF

®

Pb-Free

Note:

1. For other voltages available. Contact Micrel Marketing for details.

Pin Configuration

FB

EN

5

1

AGND

LDO

BIAS

AVIN

10 PGND

SW

VIN

ENLDO

9

8

7

2

3

4

6

10-Pin 2mm x 2mm Thin MLF

Pin Description

Pin Number

Pin Name

Pin Function

1

AGND

Analog (signal) Ground.

2

LDO

LDO Output (Output): Connect to a 2.2µF output capacitor.

3

BIAS

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

capacitor and should not be loaded.

4

AVIN

Analog Supply Voltage (Input): Supply voltage for the analog control circuitry

and LDO input power. Requires bypass capacitor to GND.

5

FB

Feedback. Input to the error amplifier. For the Adjustable option, connect to the

external resistor divider network to set the output voltage. For fixed output

voltage.

6

EN

Enable (Input). Logic low will shut down the switching regulator reducing the

quiescent current to less than 5µA.

7

ENLDO

Enable LDO (Input): Logic low will shut down the LDO, reducing the quiescent

current to less than 5µA.

8

VIN

Supply Voltage (Input): Supply voltage for the internal switches and drivers.

9

SW

Switch (Output): Internal power MOSFET output switches.

10

PGND

Power Ground.