May 2005

1

M9999-052405

MIC4123/4124/4125

Micrel, Inc.

MIC4123/4124/4125

Dual 3A-Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

Features

•

Reliable, low-power bipolar/CMOS/DMOS construction

•

Latch-up protected to >200mA reverse current

•

Logic input withstands swing to –5V

•

High 3A-peak output current

•

Wide 4.5V to 20V operating range

•

Drives 1800pF capacitance in 25ns

•

Short <50ns typical delay time

•

Delay times consistent with in supply voltage change

•

Matched rise and fall times

•

TTL logic input independent of supply voltage

•

Low equivalent 6pF input capacitance

•

Low supply current

3.5mA with logic-1 input

350µA with logic-0 input

•

Low 2.3Ω typical output impedance

•

Output voltage swings within 25mV of ground or V

•

‘426/7/8-, ‘1426/7/8-, ‘4426/7/8-compatible pinout

•

Inverting, noninverting, and differential configurations

•

Exposed backside pad packaging reduces heat

ePAD SOIC-8L (θ

4mm x 4mm MLF™-8L (θ

General Description

The MIC4123/4124/4125 family are highly reliable BiC-

MOS/DMOS buffer/driver/MOSFET drivers. They are higher

output current versions of the MIC4126/4127/4128, which

are improved versions of the MIC4426/4427/4428. All three

families are pin-compatible. The MIC4123/4124/4125 driv-

ers are capable of giving reliable service in more demanding

electrical environments than their predecessors. They will

not latch under any conditions within their power and voltage

ratings. They can survive up to 5V of noise spiking, of either

polarity, on the ground pin. They can accept, without either

damage or logic upset, up to half an amp of reverse current

(either polarity) forced back into their outputs.

TheMIC4123/4124/4125seriesdriversareeasiertouse,more

flexible in operation, and more forgiving than other CMOS

or bipolar drivers currently available. Their BiCMOS/DMOS

construction dissipates minimum power and provides rail-to-

rail voltage swings.

Primarily intended for driving power MOSFETs, the

MIC4123/4124/4125driversaresuitablefordrivingotherloads

(capacitive, resistive, or inductive) which require low-imped-

ance, high peak currents, and fast switching times. Heavily

loadedclocklines,coaxialcables,orpiezoelectrictransducers

are some examples. The only known limitation on loading is

that total power dissipated in the driver must be kept within

the maximum power dissipation limits of the package.

Functional Diagram

Integrated Component Count:

4 Resistors

4 Capacitors

52 Transistors

Ground Unused Inputs

INA

OUTA

INVERT ING

NONINVERTING

0.1mA

0.6mA

2kΩ

INB

OUTB

INVERT ING

NONINVERTING

0.1mA

0.6mA

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