Micrel, Inc.

MIC2103/04

August 2012

2

M9999-080712-A

Ordering Information

Part Number

Switching

Frequency

Features

Package

Junction

Temperature Range

Lead Finish

MIC2103YML

200kHz to 600kHz

Hyper Light Load

16-pin 3mm x 3mm MLF

–40°C to +125°C

Pb-Free

MIC2104YML

200kHz to 600kHz

Hyper Speed Control

16-pin 3mm x 3mm MLF

–40°C to +125°C

Pb-Free

Pin Configuration

16-Pin 3mm x 3mm MLF (ML)

(TOP VIEW)

Pin Description

Pin Number

Pin Name

Pin Function

1

VDD

Internal +5V linear regulator output. VDD is the internal supply bus for the device. A 1μF ceramic

capacitor from VDD to AGND is required for decoupling. In the applications with VIN<+5.5V, VDD

should be tied to VIN to by-pass the linear regulator.

2

PVDD

5V supply input for the low-side N-channel MOSFET driver, which can be tied to VDD externally.

A 1μF ceramic capacitor from PVDD to PGND is recommended for decoupling.

3

ILIM

Current Limit Setting. Connect a resistor from SW to ILIM to set the over-current threshold for the

converter.

4

DL

Low-Side Drive output. High-current driver output for external low-side MOSFET of a buck

pin and the gate of the low-side N-channel MOSFET can slow down the turn-on and turn-off

speed of the MOSFET.

5

PGND

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

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

capacitors, and the negative terminals of output capacitors. The return path for the power ground

should be as small as possible and separate from the Signal ground (AGND) return path.

6

FREQ

Switching Frequency Adjust input. Tie this pin to VIN to operate at 600kHz and place a resistor

divider to reduce the frequency.

7

DH

High-Side Drive output. High-current driver output for external high-side MOSFET of a buck

resistor between DH pin and the gate of the high-side N-channel MOSFET can slow down the

turn-on and turn-off speed of the MOSFET.

8

SW

Switch Node and Current-Sense input. High current output driver return. The SW pin connects

directly to the switch node. Due to the high-speed switching on this pin, the SW pin should be

routed away from sensitive nodes. The SW pin also senses the current by monitoring the voltage

across the low-side MOSFET during OFF time. In order to sense the current accurately, connect

the low-side MOSFET drain to the SW pin using a Kelvin connection.