September 1999

1

MIC4426/4427/4428

MIC4426/4427/4428

Micrel

MIC4426/4427/4428

Dual 1.5A-Peak Low-Side MOSFET Driver

General Description

The MIC4426/4427/4428 family are highly-reliable dual low-

side MOSFET drivers fabricated on a BiCMOS/DMOS pro-

cess for low power consumption and high efficiency. These

drivers translate TTL or CMOS input logic levels to output

voltage levels that swing within 25mV of the positive supply

or ground. Comparable bipolar devices are capable of swing-

ing only to within 1V of the supply. The MIC4426/7/8 is

available in three configurations: dual inverting, dual nonin-

verting, and one inverting plus one noninverting output.

The MIC4426/4427/4428 are pin-compatible replacements

for the MIC426/427/428 and MIC1426/1427/1428 with im-

proved electrical performance and rugged design (Refer to

the Device Replacement lists on the following page). They

can withstand up to 500mA of reverse current (either polarity)

without latching and up to 5V noise spikes (either polarity) on

ground pins.

Primarily intended for driving power MOSFETs, MIC4426/7/8

drivers are suitable for driving other loads (capacitive, resis-

tive, or inductive) which require low-impedance, high peak

current, and fast switching time. Other applications include

driving heavily loaded clock lines, coaxial cables, or piezo-

electric transducers. The only load limitation is that total driver

power dissipation must not exceed the limits of the package.

Functional Diagram

INA

OUTA

INVERTING

NONINVERTING

0.1mA

0.6mA

2k

Ω

INB

OUTB

INVERTING

NONINVERTING

0.1mA

0.6mA

2k

Ω

GND

Features

• Bipolar/CMOS/DMOS construction

• Latch-up protection to >500mA reverse current

• 1.5A-peak output current

• 4.5V to 18V operating range

• Low quiescent supply current

4mA at logic 1 input

400

µA at logic 0 input

• Switches 1000pF in 25ns

• Matched rise and rall times

•7

Ω output impedance

• < 40ns typical delay

• Logic-input threshold independent of supply voltage

• Logic-input protection to –5V

• 6pF typical equivalent input capacitance

• 25mV max. output offset from supply or ground

• Replaces MIC426/427/428 and MIC1426/1427/1428

• Dual inverting, dual noninverting, and inverting/

noninverting configurations

• ESD protection

Applications

• MOSFET driver

• Clock line driver

• Coax cable driver

• Piezoelectic transducer driver