MIC4416 Evaluation Board Micrel MIC4416 Evaluation Board IttyBitty™ Low-Side MOSFET Driver Description Bill of Materials Item Qty. — 1 The MIC4416 evaluation board is an assembled low-side switch for 4.5V to 18V single-supply applications and 0V to 30V dual-supply applications. Requirements The MIC4416 evaluation board requires one or two power supplies, a load, and logic signal. C1 1 Q1 1 Operation Connect the evaluation board in either of the configurations shown. A function generator can be used as a control signal. Logic low must be < 0.8V. Logic high must be > 2.4V but not exceeding VS. Applying logic high to the control input will energize the load; logic low will de-energize the load. The MIC4416 demo board operates down to 4.5V with a logic-level MOSFET, such as the IRL3103. Because the IRL3103 also has a ±20V maximum gate voltage rating, the same MIC4416 evaluation board operates up to 18V. (Logiclevel MOSFET gates are usually rated at ±10V maximum. See “MOSFET Selection” in the MIC4416 data sheet for more information.) The load supply can be separate and operate anywhere within the ratings of the MOSFET (up to 30V). Supply Precautions Description Micrel MIC4416BM4 IttyBitty™ Low-Side MOSFET Driver AVX TAJB475M020 Note 1 1.0µF 35V tantalum 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; 19mΩ at VGS = 4.5V, ID = 28A, TJ = 25°C. The gate features logic-level performance with ±20V maximum rating. Heat sinking is required at higher currents. VDSS = 30V. Load Precautions A 3.6k, 1/4W resistor can be used as a low-current demonstration load. When switching other loads, always stay within the current rating of the MOSFET and power supply. See Note 2, above. The MOSFET is located near the edge of the evaluation board so that it can be fastened to a flat heat sink. Inductive loads require a Schottky diode to control the inductive kick that occurs upon turnoff. Refer to the MIC4416 data sheet for a connection example. At high current, leads to a resistive load may also exhibit enough inductance to cause significant inductive kick. The MIC4416 evaluation board includes a tantalum bypass capacitor on the supply input. Always apply power using the power supply’s on/off 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 0V to 30V Load Supply – Load Load + Control Logic Control Logic 4.5V to 18V Supply TTL TTL + 4.5V to 18V Supply – + MIC4416 Evaluation Board Wiring (Single-Supply Configuration) MIC4416 Evaluation Board Wiring (Dual-Supply Configuration) MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA August 1996 – 1 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 MIC4416 Evaluation Board MIC4416 Evaluation Board Micrel Schematic Diagram VS LOAD 2 CTL 74HC04 or other logic output 4 C1 0.1µF VS CTL G GND Load Q1 MIC4416 Load Supply 0V to 18V 3 GND 1 C2 1.0µF GND MIC4416 Evaluation Board Schematic Diagram (Single-Supply Configuration) VS LOAD 2 CTL 74HC04 or other logic output 4 C1 0.1µF VS CTL G GND Load Q1 MIC4416 3 GND 1 C2 1.0µF Logic Supply 4.5V to 18V Load Supply 0V to 30V GND MIC4416 Evaluation Board Schematic Diagram (Dual-Supply Configuration) Printed Circuit Layout Top Actual Size Silk Screen (Top) Actual Size Bottom Actual Size MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX USA + 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. © 1995 Micrel Incorporated MIC4416 Evaluation Board 2 August 1996