Micrel, Inc.

MIC2298

October 2007

2

M9999-101707-B

Ordering Information

Part Number

OVP

Frequency

Junction Temp. Range

Package

Lead Finish

MIC2298-15YML

15V

1MHz

–40° to +125°C

12-Pin 3x3 MLF

®

Pb-Free

Note:

MLF

Pin Configuration

PGND

SW

PGND

SW

5

1

BRT

SS/DIM

FB

AGND

12 COMP

EN

VIN

OVP

11

10

9

2

3

4

8

6

7

EP

12-Pin 3mm x 3mm MLF (ML)

(Top View)

Pin Description

Pin Number

Pin Name

Pin Function

1

BRT

BRT (input): Apply a voltage greater than or equal to 1V to achieve full

brightness current as determined by the ballast resistor. A 10µA current source

sets the voltage on the resistor. Hence a 50K resistor would yield 0.5V which

causes a reduction in LED current to 50% of full brightness. Grounding the BRT

reduces the current further to 20% of full brightness. This pin may also be driven

by a PWM signal for the same effect.

2

SS/DIM

Soft start/dimming (input) 40k

Ω source. 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. This can also be done with a resistor to GND

3

FB

Feedback (Input): Output voltage sense node. Connect the cathode of the LED

to this pin.

4

AGND

Analog Ground

5,6

PGND

Power Ground

7,8

SW

Switch Node: Internal power BIPOLAR collector.

9

OVP

Over-Voltage Protection (OVP): Connect to the output voltage to clamp the

maximum output voltage. A resistor divider from this pin to ground could be

used to raise the OVP level beyond 15V (max)

10

VIN

Supply (Input): 2.5V to 10V for internal circuitry.

11

EN

Enable (Input): Applying 1.5V or greater enables the regulator. Applying a

voltage of 0.4V or less disables the MIC2298.

12

COMP

Compensation pin (input): Add external R and C to GND to stabilize the

converter.

Pad

EP

Ground (Return): Backside exposed pad.