May 2005

1

MIC4416/4417

MIC4416/4417

Micrel, Inc.

Features

• +4.5V to +18V operation

• Low steady-state supply current

50µA typical, control input low

370µA typical, control input high

•1.2A nominal peak output

3.5Ω typical output resistance at 18V supply

7.8Ω typical output resistance at 5V supply

• 25mV maximum output offset from supply or ground

• Operates in low-side switch circuits

• TTL-compatible input withstands –20V

• ESD protection

•Inverting and noninverting versions

Applications

• Battery conservation

• Solenoid and motion control

• Lamp control

• Switch-mode power supplies

MIC4416/4417

IttyBitty™ Low-Side MOSFET Driver

General Description

The MIC4416 and MIC4417 IttyBitty™ low-side MOSFET

drivers are designed to switch an N-channel enhancement-

type MOSFET from a TTL-compatible control signal in low-

side switch applications. The MIC4416 is noninverting and

the MIC4417 is inverting. These drivers feature short delays

and high peak current to produce precise edges and rapid

rise and fall times. Their tiny 4-lead SOT-143 package uses

minimum space.

The MIC4416/7 is powered from a +4.5V to +18V supply

voltage. The on-state gate drive output voltage is approxi-

mately equal to the supply voltage (no internal regulators or

clamps). High supply voltages, such as 10V, are appropriate

for use with standard N-channel MOSFETs. Low supply

voltages, such as 5V, are appropriate for use with logic-level

N-channel MOSFETs.

In a low-side configuration, the driver can control a MOSFET

that switches any voltage up to the rating of the MOSFET.

The MIC4416 is available in the SOT-143 package and

is rated for –40°C to +85°C ambient temperature range.

Typical Application

On

Off

VS

CTL

G

GND

MIC4416

4.7µF

Si9410DY*

N-channel

MOSFET

Load

1

32

4

+12V

MOSFET drain-to-source rating

*Siliconix

30m

Ω, 7A max.

0.1µF

Low-Side Power Switch

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