Micrel, Inc.

MIC2285A

August 2007

2

M9999-083107-B

Ordering Information

Part Number

Marking

Output

Voltage*

Junction

Temperature Range

Package

Lead Finish

MIC2285AYMT

WPA

Adj.

–40° to +125°C

10-Pin 2x2 Thin MLF

®

Pb-free

Note

* For other voltage options available, please contact Micrel Marketing for details.

MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Pin Configuration

FB

EN

5

1

AGND

LDO

BIAS

AVIN

10 PGND

SW

VIN

LOWQ

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

3

BIAS

Internal circuit bias supply. Must be decoupled 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 device, reducing the quiescent

current to less than 5µA.

7

_____

LOWQ

Enable LDO Mode (Input): Logic low enables the internal LDO and disables the

PWM operation. Logic high enables the PWM mode and disables the LDO

mode.

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.