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January 1996 1 MIC5018 Evaluation Board

MIC5018 Evaluation Board

IttyBitty™ High-Side MOSFET Driver

Description

The MIC5018 evaluation board is an assembled, high-side

switch for 2.7V to 9V power-switching applications.

Requirements

The MIC5018 evaluation board requires a power supply,

load, and logic output.

Operation

Connect the evaluation board as shown. A function genera-

tor with a TTL output, or a logic-level, square wave output, can

be used as a control signal. On/o power switch operation

can be simulated by setting the output frequency to about 1Hz

or 2Hz.

Applying logic high to the control input will energize the load;

logic low will de-energize the load.

The MIC5018 makes it possible to switch a supply as low as

2.7V using a logic-level MOSFET such as the IRL3103.

Because the IRL3103 also has a 20V maximum gate±

voltage rating, the MIC5018 evaluation board can switch a 5V

logic supply or higher voltage circuit without an additional

gate-to-source clamping zener. (Logic-level MOSFET gates

are usually rated at 10V maximum. See “MOSFET Selec-±

tion” in the MIC5018 data sheet for more information.)

Supply Precautions

The MIC5018 evaluation board includes a tantalum bypass

capacitor on the supply input. Always apply power using the

power supply’s on/o switch. Avoid applying power by

connecting the supply input to an operating power supply.

Applying power instantaneously to any tantalum capacitor

may cause capacitor failure.

Wiring

+–

Load

2.7V to 9V Supply

TTL

Control Logic

Your load here

or try a

100 1/4WΩ

resistor

MIC5018 Evaluation Board Wiring

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970

Bill of Materials

Item Qty. Description

—1Micrel, MIC5018BM4

IttyBitty™ high-side MOSFET driver

C1 1 AVX, TAJB475M020 Note 1

4.7µF 20V tantalum

Q1 1 International Rectifier, IRL3103 Note 2

14mΩ N-channel power MOSFET

Note 1: See “Operation: Supply Precautions” for information on safely

using tantalum capacitors.

Note 2: Manufacturer’s preliminary data sheet ratings:

14mΩ at VGS = 10V, ID = 34A, TJ = 25°C;

19m at VΩGS = 4.5V, ID = 28A, T J

= 25 C.°

The gate features logic-level performance with 20V maximum±

rating. Heat sinking is required at higher currents.

Load Precautions

A 100 , 1/4W resistor can be used as a low-current demon-Ω

stration load. When switching other loads, always stay within

the current rating of the MOSFET and power supply. See

Note 2, above.

The evaluation board MOSFET is located near the edge of

the board so that it can be fastened to a at heat sink.

Inductive loads require a Schottky diode to control the induc-

tive kick that occurs upon turno. Refer to the MIC5018 data

sheet for a connection example. At high current, leads to a

resistive load may also exhibit enough inductance to cause

signicant inductive kick.

MIC5018 Evaluation Board Micrel

MIC5018 Evaluation Board 2 January 1996

MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL FAX + 1 (408) 944-0800 + 1 (408) 944-0970

This information is believed to be accurate and reliable; however, no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

Schematic Diagram

> 2.4V = On

< 0.8V = Off VS

CTL

GND

MIC5018

4.7µF

2 3

* International Rectifier

100m

Ω

, 17A max.