MIC2871 Datasheet, PDF (2/24 Pages) Micrel Semiconductor – 1.2A High-Brightness LED Flash Driver with Single-Wire Serial Interface

Micrel, Inc.
Ordering Information
Part Number
Marking Code Temperature Range
Package⁽¹⁾
MIC2871YMK
2871
–40°C to +125°C
14-pin 3mm × 2mm LDFN
Note:
1. Package is a GREEN RoHS-compliant package. Lead finish is Pb-Free. Mold compound is Halogen Free.
Pin Configuration
MIC2871
Lead Finish
Pb-Free
Pin Description
Pin
Number
1
2
3
Pin Name
AGND1
DC
LED
4
FEN1
5
6
7
8
9, 12
10
11
13
AGND2
VIN
PGND1
OUT
NC
SW
FEN2
PGND2
14
FRSET
EP
ePad
14-Pin 3mm × 2mm LDFN (MK)
(Top View)
Pin Function
Analog Ground. LED current return path.
Single-wire serial interface control input.
LED Current Sink Pin. Connect the LED anode to OUT and cathode to this pin.
Flash Mode Enable Pin. Toggling FEN1 from LOW to HIGH enables MIC2871 into the flash
mode. FEN1 is logic-OR with FEN2. If this pin is left floating, it is pulled-down internally by a built-
in 1µA current source when the device is enabled.
Analog Ground. Reference ground of the FRSET pin.
Supply Input Pin. Connect a low-ESR ceramic capacitor of at least 2.2µF to AGND2.
Power Ground. Inductor current return path.
Boost Converter Output Pin. This is connected to the anode of the LED. Connect a low ESR
ceramic capacitor of at least 4.7µF to PGND1.
No Connect. Connect this pin to AGND or leave it floating.
Inductor Connection Pin. It is connected to the internal power MOSFETs.
Additional Flash Mode Enable Pin. FEN2 is logic-OR with FEN1. If this pin is left floating, it is
pulled-down internally by a built-in 1µA current source when the device is enabled.
Power Ground.
Flash Mode Current-Level Programming Pin. Connect a resistor from this pin to AGND2 to set
the maximum current in the flash mode. This pin may be grounded if the default flash mode
current (1A) is desired. This pin cannot be left floating and the recommended resistance range is
from 17kΩ to 60kΩ.
Exposed Heat Sink Pad. Connect to ground for best thermal performance.
May 29, 2013
2
052913-1.0 (while in progress)
Revision 1.0 (final document)