MIC4478/79/80 Evaluation Board 32V Low-Side Dual MOSFET Drivers General Description Requirements The MIC4478, MIC4479, and MIC4480 are low-side dual MOSFET drivers. They are designed to switch N-channel enhancement type MOSFETs from TTL-compatible control signals for low-side switching applications. The MIC4478 is dual non-inverting, the MIC4479 is dual inverting, and the MIC4480 has complimentary non-inverting and inverting drivers. Short propagation delays and high peak currents produce precise edges and rapid rise and fall times. The MIC4478/4479/4480 are powered from a +4.5V to +32V supply voltage. The on-state gate drive output voltage is approximately equal to the supply voltage (no internal regulators or clamps). In a low-side configuration, the drivers can control a MOSFET that switches any voltage up to the rating of the MOSFET. The MIC4478/4479/4480 are available in an 8-lead SOIC (ePAD and non-ePAD) package and rated for –40°C to +125°C ambient temperature range. The evaluation board requires: Data sheets and support documentation are available on Micrel’s web site at: www.micrel.com. Evaluation Board Description Control IC ............................... MIC4478/MIC4479/MIC4480 Topology......... Dual Low-Side MOSFET Driver with Enable (1) VDD Supply Voltage Range ............................. 4.5V to 32V Maximum Input Pin Voltage ........................................... VDD Maximum Enable Pin Voltage ........................................ VDD Maximum External FET Supply Voltage (VIN) .............. 100V Note: 1. VDD must be less than 18V so as not to exceed the maximum FET VGS rating. Features • A VDD power supply with an output between 4.5V and 32V to power the driver. While the driver can operate up to 32V, do not exceed 18V when using the MOSFETs that come with this evaluation board. • An external VIN supply voltage for powering the MOSFET drains. Do not exceed the 100V VDS rating of the MOSFETs. Precautions • Ensure the VDD supply does not exceed the maximum VGS of the MOSFETs being used. VGS(ABS_MAX) for the MOSFETs that come with the evaluation board is 20V. 18V maximum is recommended. • The evaluation board does not have reverse polarity protection. Applying a negative voltage to VDD or VIN may damage the device. Do not exceed 32V on the input, nor exceed the MOSFET’s VGS(MAX) to prevent damage to the driver and MOSFETs. Do not exceed 100V on either of the two DRAIN_A or DRAIN_B terminals. Ordering Information Part Number Description MIC4478YML EV MIC4478YML Evaluation Board MIC4479YML EV MIC4479YML Evaluation Board MIC4480YML EV MIC4480YML Evaluation Board • External MOSFETs on the board to simplify testing. • Resistor and capacitor component locations on the driver outputs for ease of testing. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com September 9, 2015 Revision 1.0 Micrel, Inc. MIC4478/79/80 Evaluation Board Getting Started External MOSFETs 1. Connect the VDD and GND terminals to an external supply voltage. The input voltage range is from 4.5V to 18V. The 18V maximum is limited by the VGS of the MOSFETs. A pair of 100V MOSFETs are included with the board to facilitate testing of the driver. Terminals are provided for an external supply. A 1kΩ resistor is connected in series between each of the supply inputs and MOSFET drains. This limits the current flowing through the MOSFETs and allows the switching waveform to be observed. These resistors may be changed or removed, depending on the application. A 4.7µF capacitor, from the supply terminal to ground, is provided for decoupling the high frequency switching currents. The capacitors and MOSFETs are rated to 100V. 2. Apply a square wave or pulse to the INA and/or INB terminals. The logic 0 level is less than 0.8V and the logic 1 level is greater than 2.4V. Do not exceed VDD on the inputs. Headers TP1 and TP4 may be used to apply or monitor the input signal. 3. The output signal can be monitored with a scope probe at the OUT_A and OUT-B pins. Headers TP3 and TP6 may also be used to monitor the output signals. ENA and ENB Inputs The ENA and ENB inputs are each accessible through a 3pin header. The EN pins are internally pulled up and do not need a jumper or external signal for the outputs to be enabled. The outputs can be individually disabled with a low signal or a shorting jumper connected from EN to ground. Headers JP2 and JP3 can be used to apply or monitor the enable signals. INA and INB Inputs The output drivers are controlled by the INA and INB signal. Table 1 to shows the output state based on the input for each of the three drivers. Do not leave the inputs floating when VDD is applied. Table 1. Input Configuration Device INA (Pin 2) INB (Pin 4) OUTA (Pin 7) OUTB (Pin 5) MIC4478 L/H L/H L/H L/H MIC4479 L/H L/H H/L H/L MIC4480 L/H L/H H/L L/H OUTA and OUTB Outputs The evaluation board allows the option of driving a MOSFET or capacitance. The board is populated with a 100V N-channel MOSFET to show “real world” operation. The MOSFET may be removed and a capacitor used if standardized testing is needed. Capacitor locations C3 (OUT_A) and C6 (OUT_B) may be used for capacitive testing. Resistor locations R4 and R9 allow a resistor to be placed in series with the driver output. The board comes with the resistor pads shorted with etch. The etch between the pads of the resistor must be cut before a resistor is added. September 9, 2015 2 Revision 1.0 Micrel, Inc. MIC4478/79/80 Evaluation Board Evaluation Board Schematic J1 VDD C1 0.1µF R6 open R1 open J4 INA 2 3 J11 INB ENA INA GND 4 INB TP1 J3 GND TP4 J8 GND R8 open ENB OUTA VS OUTB 8 R4 open R5 1k JP1b R5b open J2 OutA 7 J9 OutB 6 5 TP6 U1 MIC4478YME MIC4479YME MIC4480YME R9 open TP3 C6 open J14 GND September 9, 2015 Q1b open JP2 JP3 1 J10 ENB J6 DRAIN_A JP2b J5 ENA R2 open C2 C7 1µF 1µF Q1 AM4492N Q2b open R7b C3 open open Q2 AM4492N 3 C4 4.7µF 100V J12 GND J7 DRAIN_B R7 1k C5 4.7µF 100V J13 GND Revision 1.0 Micrel, Inc. MIC4478/79/80 Evaluation Board Bill of Materials Item Part Number C1 C1608X7R1H104K080AA C2, C7 C3126X5R1H105K160AA Manufacturer (2) TDK TDK C3, C6 C4, C5 Q1, Q2 C3225X7S2A475M200AB AM4492N TDK Analog Power (3) R1, R2, R4, R5b, R6, R7b, R8, R9 R5, R7 CRCW12061001FRT1 (4) Vishay Description Qty. 0.1µF Ceramic Capacitor, 50V, X7R, Size 0603 1 1µF Ceramic Capacitor, 50V, X5R, Size 1206 1 Open Location, Size 0603 2 4.7µF Ceramic Capacitor, 100V, X7S, Size 1210 2 100V, N-Channel MOSFET, SOIC-8 2 Open Location, Size 0603 8 1kΩ Resistor (1206 size), 1% 2 32V Low-Side Dual MOSFET Driver 1 MIC4478YME U1 MIC4479YME (5) Micrel, Inc. MIC4480YME Notes: 2. TDK: www.tdk.com. 3. Analog Power: www.analogpowerinc.com. 4. Vishay: www.vishay.com. 5. Micrel, Inc.: www.micrel.com. September 9, 2015 4 Revision 1.0 Micrel, Inc. MIC4478/79/80 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer September 9, 2015 5 Revision 1.0 Micrel, Inc. MIC4478/79/80 Evaluation Board MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. Corporation headquarters and state-of-the-art wafer fabrication facilities are located in San Jose, CA, with regional sales and support offices and advanced technology design centers situated throughout the Americas, Europe, and Asia. Additionally, the Company maintains an extensive network of distributors and reps worldwide. Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this datasheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2015 Micrel, Incorporated. September 9, 2015 6 Revision 1.0