MIC3202 Просмотр технического описания (PDF) - Micrel

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MIC3202

High-Brightness LED Driver with Integrated MOSFET and High-Side Current Sense

Micrel 

Micrel, Inc.

MIC3202/MIC3202-1

Ordering Information (1)

Part Number

Marking

Junction Temperature Range

MIC3202YME

MIC3202YME

−40°C to +125°C

MIC3202-1YME

MIC3202-1YME

−40°C to +125°C

Note:

1. YM® is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.

Package

8-Pin SOIC

8-Pin SOIC

PWM

Dither

Non-Dither

Pin Configuration

8-Pin ePAD SOIC

MIC3202/MIC3202-1

Pin Description

Pin

Number

1

2

3

4

5

6

7

8

EP

Pin Name Pin Function

VCC

CS

VIN

AGND

EN

DIM

PGND

LX

GND

Voltage Regulator Output. The VCC pin supplies the power to the internal circuitry. The VCC is the output

of a linear regulator which is powered from VIN. A 1µF ceramic capacitor is recommended for bypassing

and should be placed as close as possible to the VCC and AGND pins.

Current-Sense Input. The CS pin provides the high-side current sense to set the LED current using an

external sense resistor.

Input Power Supply. The VIN pin is the input supply pin to the internal circuitry and the positive input to

the current sense comparator. Due to the high frequency switching noise, a 1µF ceramic capacitor is

recommended to be placed as close as possible to VIN pin and the power ground (PGND) pin for

bypassing. Please refer to layout recommendations.

Ground pin for analog circuitry. Internal signal ground for all low power sections.

Enable Input. The EN pin provides a logic level control of the output. The voltage has to be 2.0V or higher

to enable the current regulator. The output stage is also gated by the DIM input. When the EN pin is

pulled low, the regulator goes to off state and the supply current of the device is greatly reduced (below

1µA).

PWM Dimming Input. The DIM pin provides the control for brightness of the LED. A PWM input can be

used to control the brightness of LED. DIM high enables the output and its voltage has to be at least 2.0V

or higher. DIM low disables the output, regardless of EN “high” state.

Power Ground pin for Internal Power FET. Power Ground (PGND) is the ground path for the high current.

The current loop for the power ground should be as small as possible and separate from the Analog

ground (AGND) loop. Refer to the layout considerations for more details.

Drain of Internal Power MOSFET. The LX pin connects directly to the inductor and provides the switching

current necessary to operate in hysteretic mode. Due to the high frequency switching and high voltage

associated with this pin, the switch node should be routed away from sensitive nodes.

Connect to PGND.

September 2010

2

M9999-091710-A

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