Micrel, Inc.

MIC2245

January 2006

2

M9999-012406

www.micrel.com

Ordering Information

Part Number

Output

Voltage*

Junction

Temperature Range

Package

Lead Finish

MIC2245YML

Adj.

–40° to +125°C

10-Pin 3x3 MLF™

Pb-free

Note:

* Other Voltage options available. Contact Micrel for details.

Pin Configuration

FB

EN

AGND

LDO

BIAS

AVIN

PGND

SW

VIN

LOWQ

5

1

2

3

4

6

10

9

8

7

EP

10-Pin 3mm x 3mm MLF (ML)

Pin Description

Pin Number

Pin Name

Pin Function

1

AGND

Analog (signal) Ground.

2

LDO

3

BIAS

Internal circuit bias supply. Must be filtered from input voltage through an RC

lowpass filter with a cutoff frequency ≥

()(

)

100nF

20.5Ω

2π

1

.

4

AVIN

Analog Supply/Input 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/Input Voltage (Input): Supply voltage for the internal switches and

drivers.

9

SW

Switch (Output): Internal power MOSFET output switches.

10

PGND

Power Ground.

EP

GND

Ground, backside pad.