MIC3223 Datasheet, PDF (2/24 Pages) Micrel Semiconductor – High Power Boost LED Driver with Integrated FET

Micrel, Inc.
Ordering Information
Part Number
MIC3223YTSE
Junction Temp. Range
–40° to +125°C
Pin Configuration
MIC3223
Package
16-pin ePad TSSOP
Lead Finish
PB- free
16-Pin ePad TSSOP (TSE)
Pin Description
Pin Number
1
2
3
4
5
6
7,8,9,10
11
12
13
14
15
16
17
Pin Name
EN
SS
COMP
FB
OVP
PGND
SW
VIN
DRVVDD
VDD
DIM_IN
DIM_OUT
AGND
EP
Pin Function
Enable (Input): Logic high enables and logic low disables operation.
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.
Compensation Pin (Input): Add external R and C-to-GND to stabilize the converter.
Negative Input to Error Amp
Connect to the centre tap of an external resistor divider, the top of which is tied to Vout
and bottom-to-ground.
Power Ground
Switch Node (Input): Internal NMOS switch Drain Pin
Input Supply
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.
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.
PWM input to control LED dimming.
Output driver to drive external FET for LED dimming.
Analog Ground
Connect to Power Ground
January 2010
2
M9999-011510-A