MIC2176-2YMM datasheet(2/31 Pages) MICREL

2 / 31 page

Micrel, Inc.

MIC2176

November 2010

M9999-111710-A

Ordering Information

Part Number

Output

Voltage

Switching Frequency

Junction Temperature Range

Package

Lead Finish

MIC2176-1YMM

Adjustable

100kHz

–40°C to +125°C

10-pin MSOP

Pb-Free

MIC2176-2YMM

Adjustable

200kHz

–40°C to +125°C

10-pin MSOP

Pb-Free

MIC2176-3YMM

Adjustable

300kHz

–40°C to +125°C

10-pin MSOP

Pb-Free

Pin Configuration

10-Pin MSOP (MM)

Pin Description

Number

Pin Name

Pin Function

HSD

High-Side MOSFET Drain Connection (Input): The HSD pin in the input of the adaptive On-time

control circuitry. A 0.1uF ceramic capacitor between the HSD pin and the power ground (PGND) is

required and must be place as close as possible to the IC.

Enable (Input): A logic level control of the output. The EN pin is CMOS compatible. Logic high or

floating = enable, logic low = shutdown. In the off state, the VDD supply current of the device is

reduced (typically 0.7mA). Do not connect the EN pin to the HSD pin.

Feedback (Input): Input to the transconductance amplifier of the control loop. The FB pin is regulated

to 0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output

voltage.

GND

Signal ground. GND is the ground path for the device bias voltage VDD and the control circuitry. The

loop for the signal ground should be separate from the power ground (PGND) loop.

VDD

VDD Bias (Input): Power to the internal reference and control sections of the MIC2176. The VDD

operating voltage range is from 4.5V to 5.5V. A 1µF ceramic capacitor from the VDD pin to the PGND

pin must be placed next to the IC.

Low-Side Drive (output): High-current driver output for external low-side MOSFET. The DL driving

voltage swings from ground to VDD.

PGND

Power Ground. PGND is the ground path for the buck converter power stage. The PGND pin

connects to the sources of low-side N-Channel external MOSFETs, the negative terminals of input

capacitors, and the negative terminals of output capacitors. The loop for the power ground should be

as small as possible and separate from the Signal ground (GND) loop.

High-Side Drive (output): High-current driver output for external high-side MOSFET. The DH driving

voltage is floating on the switch node voltage (VSW). Adding a small resistor between DH pin and the

gate of the high-side N-channel MOSFETs can slow down the turn-on and turn-off time of the

MOSFETs.

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