Micrel, Inc.

MIC2871

May 29, 2013

2

052913-1.0 (while in progress)

Revision 1.0 (final document)

Ordering Information

Part Number

Marking Code

Temperature Range

Package

(1)

Lead Finish

MIC2871YMK

2871

–40°C to +125°C

14-pin 3mm × 2mm LDFN

Pb-Free

Note:

1.

Package is a GREEN RoHS-compliant package. Lead finish is Pb-Free. Mold compound is Halogen Free.

Pin Configuration

14-Pin 3mm × 2mm LDFN (MK)

(Top View)

Pin Description

Pin

Number

Pin Name

Pin Function

1

AGND1

Analog Ground. LED current return path.

2

DC

Single-wire serial interface control input.

3

LED

LED Current Sink Pin. Connect the LED anode to OUT and cathode to this pin.

4

FEN1

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.

5

AGND2

Analog Ground. Reference ground of the FRSET pin.

6

VIN

Supply Input Pin. Connect a low-ESR ceramic capacitor of at least 2.2µF to AGND2.

7

PGND1

Power Ground. Inductor current return path.

8

OUT

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.

9, 12

NC

No Connect. Connect this pin to AGND or leave it floating.

10

SW

Inductor Connection Pin. It is connected to the internal power MOSFETs.

11

FEN2

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.

13

PGND2

Power Ground.

14

FRSET

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 17k

Ω to 60kΩ.

EP

ePad

Exposed Heat Sink Pad. Connect to ground for best thermal performance.