Micrel, Inc.

MIC3263

January 2010

3

M9999-012110

mati

Junction Temperature Range

Package

Lead Finish

Ordering Infor

on

(1)

Part Number

MIC3263YML

–40° to +125°C

24-Pin 4mm x 4mm MLF®

Pb-Free

Note:

1. Other Voltage available. Contact Micrel for detail

Pin Configuration

24-Pin 4mm x 4mm MLF®

Pin Description

Pin Number

Pin Name

Pin Function

1

FS

Hz to 1.8MHz.

W

Booster Switching Frequency:

Connect a resistor-to-GND to set the switching frequency from 400k

2

RS

ent Resistor.

LP

Slope Compensation Adjustm

3

OV

ltage divider virtual ground.

PS

OVP and FB vo

4

O

or amp in the Boost stage.

VP

Overvoltage Protection Input. This is also the FB voltage for the err

5

MO

equency range:

for an external dimming pulse input.

DE

Select a dimming fr

0V for 100Hz to 2kH

used

6

DF

Hz through an external resistor and MODE.

Requires a series RC for stability.

S

Set a dimming frequency from 100Hz to 20k

7

COMP

Loop Compensation connect R and C-to-GND.

8

DRC

Dimming Ratio Control Pulse:

Its duty cycle is converted to one of 16 dimming levels. The duty-cycle difference between two

adjacent levels is ±6.25%. And about 2% duty-cycle hysteresis exists between two adjacent

levels to eliminate dimming flicker.

DRC can be from 100Hz to 40kHz.

9

CINT

Integration Cap:

Use a 0.01µF for 2kHz to 20kHz and 0.1µF for 100Hz ─ 2kHz.