Micrel, Inc.

MIC2164/-2/-3/C

September 2010

2

M9999-091310-D

Ordering Information

Part Number

Voltage

Switching

Frequency

Accuracy

Junction Temperature Range

Package

Lead Finish

MIC2164YMM

Adjustable

300kHz

±1%

–40° to +125°C

10-pin MSOP

Pb-Free

MIC2164-2YMM

Adjustable

600kHz

±1%

–40° to +125°C

10-pin MSOP

Pb-Free

MIC2164-3YMM

Adjustable

1MHz

±1%

–40° to +125°C

10-pin MSOP

Pb-Free

MIC2164CYMM

Adjustable

270kHz

±3%

–40° to +125°C

10-pin MSOP

Pb-Free

Pin Configuration

10-Pin MSOP (MM)

Pin Description

Pin Number

Pin Name

Pin Function

1

HSD

High-Side N-MOSFET Drain Connection (input): Power to the drain of the external high-side N-channel

MOSFET. The HSD operating voltage range is from 3V to 28V. Input capacitors between HSD and the

power ground (PGND) are required.

2

EN

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, supply current of the device is greatly reduced (typically

0.8mA).

3

FB

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.

4

GND

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

5

IN

Input Voltage (input): Power to the internal reference and control sections of the MIC2164/-2/-3. The IN

operating voltage range is from 3V to 5.5V. A 1µF and 0.1µF ceramic capacitors from IN to GND are

recommended for clean operation.

6

DL

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

voltage swings from ground-to-IN.

7

PGND

Power Ground. PGND is the ground path for the MIC2164/-2/-3 buck converter power stage. The PGND

pin connects to the sources of low-side N-Channel 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.

8

DH

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

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.