MIC4120/4129

Micrel, Inc.

August 2005

1

M9999-081105

MIC4120/4129

6A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

General Description

MIC4120 and MIC4129 MOSFET drivers are resilient,

efficient, and easy to use. The MIC4129 is an inverting

driver, while the MIC4120 is a non-inverting driver. The

MIC4120 and MIC4129 are improved versions of the

MIC4420 and MIC4429.

The drivers are capable of 6A (peak) output and can drive

the largest MOSFETs with an improved safe operating

margin. The MIC4120/4129 accept any logic input from

tor networks. Proprietary circuits allow the input to swing

negative by as much as 5V without damaging the part. Ad-

ditional circuits protect against damage from electrostatic

discharge.

MIC4120/4129 drivers can replace three or more discrete

components, reducing PCB area requirements, simplifying

product design, and reducing assembly cost.

Modern BiCMOS/DMOS construction guarantees freedom

from latch-up. The rail-to-rail swing capability insures ad-

equate gate voltage to the MOSFET during power up/down

sequencing.

Features

• CMOS Construction

• Latch-Up Protected: Will Withstand >200mA

Reverse Output Current

• Logic Input Withstands Negative Swing of Up to 5V

• Matched Rise and Fall Times ................................ 25ns

• High Peak Output Current ............................... 6A Peak

• Wide Operating Range ............................... 4.5V to 20V

• High Capacitive Load Drive ............................10,000pF

• Low Delay Time .............................................. 55ns Typ

• Low Equivalent Input Capacitance (typ) ..................6pF

• Low Supply Current ...............450µA With Logic 1 Input

• Low Output Impedance ......................................... 2.5Ω

• Exposed backside pad packaging reduces heat

- 3mm x 3mm MFL™-8L

Applications

• Switch Mode Power Supplies

• Motor Controls

• Pulse Transformer Driver

• Class-D Switching Amplifiers

Functional Diagram

IN

OUT

MIC4129

INVERTING

MIC4120

NONINVERTING

0.1mA

0.4mA

2kΩ

GND

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com