Micrel, Inc.

MIC3223

January 2010

2

M9999-011510-A

Ordering Information

Part Number

Junction Temp. Range

Package

Lead Finish

MIC3223YTSE

–40° to +125°C

16-pin ePad TSSOP

PB- free

Pin Configuration

16-Pin ePad TSSOP (TSE)

Pin Description

Pin Number

Pin Name

Pin Function

1

EN

Enable (Input): Logic high enables and logic low disables operation.

2

SS

Soft Start (Input resistance of 30k). Connect a capacitor to GND for soft-start. Clamp the

pin to a known voltage to control the internal reference voltage and hence the output

current.

3

COMP

Compensation Pin (Input): Add external R and C-to-GND to stabilize the converter.

4

FB

Negative Input to Error Amp

5

OVP

Connect to the centre tap of an external resistor divider, the top of which is tied to Vout

and bottom-to-ground.

6

PGND

Power Ground

7,8,9,10

SW

Switch Node (Input): Internal NMOS switch Drain Pin

11

VIN

Input Supply

12

DRVVDD

For 4.5V < VIN < 6V, connect DRVVDD to VIN. DRVVDD is the input voltage supply for

the converter’s internal power FET gate driver. For VIN > 6V, connect this pin to VDD.

13

VDD

For 4.5V < VIN < 6V, this pin becomes the input voltage supply for the converter’s internal

circuit. For VIN > 6V, this pin is an output of the internal 5.5V regulator that supplies

internal circuits. User must add 10µF decoupling capacitor from VDD-to-AGND.

14

DIM_IN

PWM input to control LED dimming.

15

DIM_OUT

Output driver to drive external FET for LED dimming.

16

AGND

Analog Ground

17

EP

Connect to Power Ground