Microchip MIC5018 Manual


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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 1/4W
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
14m N-channel power MOSFET
Note 1: See Operation: Supply Precautions for information on safely
using tantalum capacitors.
Note 2: Manufacturers preliminary data sheet ratings:
14m at VGS = 10V, ID = 34A, TJ = 25°C;
19m at VGS = 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-
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.


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC5018

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