MIC2297_08 Datasheet, PDF (2/11 Pages) Micrel Semiconductor – 40V PWM Boost Regulator White LED Driver

Micrel, Inc.
MIC2297
Ordering Information
Part Number
Mark Code*
Output Over
Junction
Voltage Protection Temp. Range
MIC2297-15YML
S115
15V
–40°C to 125°C
MIC2297-42YML
S142
42V
–40°C to 125°C
* ( ) Top bar symbol after PI indicator identifying Pb-Free may not be to scale.
Package
10-Pin 2.5 x2.5 MLF^®
10-Pin 2.5 x2.5 MLF^®
Lead Finish
Pb-Free
Pb-Free
Pin Configuration
PGND 1
OVP 2
VIN 3
EN 4
COMP 5
10 SW
9 FB
8 REF
7 BRT
6 AGND
Pin Description
Pin Number
1
Pin Name
PGND
2
OVP
3
VIN
4
EN
5
COMP
6
AGND
7
BRT
8
9
10
EPad
Mach 2008
REF
FB
SW
GND
Pin Function
Ground (Return).
Over Voltage Protection (Input): Connect to the output to
clamp the maximum output voltage. A resistor divider from
this pin to ground could be used to raise the OVP level of
the 15V OVP option.
Supply (Input): Input voltage.
Enable (Input): Logic high enables regulator. Logic low shuts
down regulator.
Compensation Pin.
Analog Ground.
Brightness Control (Input): Either an analog (DAC) or filtered
PWM signal can be used. The gain equation is: VFB =
VBRT / 5. This pin should be left open if the brightness
function is not used. In that case, the FB will be set to its
default value of 200mV.
Reference Voltage (Output): This node is equal to the
voltage on the FB pin. A capacitor from REF to ground
should be used to filter the BRT voltage if PWM dimming is
implemented. A capacitor from REF to ground can also be
used to implement a soft-start function. This pin can be left
open if not used.
Feedback (Input): Output voltage sense node. Default value
is 200mV. Connect the cathode of the LED chain to this pin.
Connect current set resistor from this pin to ground.
Switch Node (Output): Internal power BIPOLAR collector.
Ground (Return): Backside pad.
2
M9999-032708