Micrel, Inc.

MIC3385

November 2006

2

M9999-111006-A

Ordering Information

Part Number

Voltage

Temperature Range

Package

Lead Finish

MIC3385YML

Adj.

–40° to +125°C

14-Pin 3mm x 3.5mm MLF

®

Pb-free

Note:

1. Other Voltage options available. Contact Micrel Marketing for details.

Pin Configuration

OUT

SW

7

3

LOWQ

EN

OUT

OUT

12 AVIN

GND

SW

SW

11

10

9

4

5

6

8

1

FB

VIN

14 BIAS

LDO

13

2

14- Pin 3mm x 3.5mm MLF

Pin Description

Pin Number

Pin Name

Pin Function

1

FB

Feedback. Input to the error amplifier. Connect to the external resistor divider

network to set the output voltage.

2

VIN

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

3

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.

4

EN

Enable (Input). Logic low will shut down the device, reducing the quiescent

current to less than 5

µA..

5,6,7

OUT

Switch Output after inductor.

8,9,10

SW

Switch (Output): Internal power MOSFET output switches before Inductor

11

GND

Power Ground. Requires input capacitor to GND.

12

AVIN

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

LDO input power. Requires bypass capacitor to GND.

13

LDO

14

BIAS

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

µF

capacitor and should not be loaded.