Micrel, Inc.

MIC4721

May 2007

2

M9999-052907-A

Ordering Information

Part Number

Voltage

Temperature Range

Package

Lead Finish

MIC4721YMM

Adj.

–40° to +125°C

10-Pin MSOP

Pb-Free

Pin Configuration

FB

EN

6

5

1

SW

VIN

SGND

BIAS

10 SW

VIN

PGND

PGOOD

9

8

7

2

3

4

10-Pin MSOP (MM)

Pin Description

Pin Number

Pin Name

Pin Function

1, 10

SW

Switch (Output): Internal power P-Channel MOSFET output switch.

2, 9

VIN

Supply Voltage (Input): Supply voltage for the source of the internal P-channel

MOSFET and driver.

Requires bypass capacitor to GND.

3

SGND

Signal (Analog) Ground. Provides return path for control circuitry and internal

reference.

4

BIAS

Internal circuit bias supply. Must be bypassed with a 0.1µF ceramic capacitor to

SGND.

5

FB

Feedback. Input to the error amplifier, connect to the external resistor divider

network to set the output voltage.

6

EN

Enable (Input). Logic level low will shutdown the device, reducing the current

draw to less than 5µA.

7

PGOOD

Power Good. Open drain output that is pulled to ground when the output voltage

is within ±7.5% of the set regulation voltage.

8

PGND

Power Ground. Provides the ground return path for the high-side drive current.