Micrel, Inc.

MIC2297

Mach 2008

2

M9999-032708

Ordering Information

Part Number

Mark Code*

Output Over

Voltage Protection

Junction

Temp. Range

Package

Lead Finish

MIC2297-15YML

S115

15V

–40°C to 125°C

10-Pin 2.5 x2.5 MLF

®

Pb-Free

MIC2297-42YML

S142

42V

–40°C to 125°C

10-Pin 2.5 x2.5 MLF

®

Pb-Free

* ( ) Top bar symbol after PI indicator identifying Pb-Free may not be to scale.

Pin Configuration

COMP

AGND

5

1

PGND

OVP

VIN

EN

10 SW

FB

REF

BRT

9

8

7

2

3

4

6

Pin Description

Pin Number

Pin Name

Pin Function

1

PGND

Ground (Return).

2

OVP

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.

3

VIN

Supply (Input): Input voltage.

4

EN

Enable (Input): Logic high enables regulator. Logic low shuts

down regulator.

5

COMP

Compensation Pin.

6

AGND

Analog Ground.

7

BRT

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.

8

REF

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.

9

FB

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.

10

SW

Switch Node (Output): Internal power BIPOLAR collector.

EPad

GND

Ground (Return): Backside pad.