MIC4600 Evaluation Board 28V Half-Bridge MOSFET Driver General Description The MIC4600 is a 28V half-bridge MOSFET driver targeted for cost sensitive applications that require high performance such as set-top boxes, gateways, routers, computing peripherals, telecom, and networking equipment. The MIC4600 operates over a supply range of 4.5V to 28V. It has an internal linear regulator that provides a regulated 5V to power the MOSFET gate drive and operates up to 1.5MHz switching frequency. The MIC4600 uses an adjustable dead time circuit to prevent shoot-through in the external high- and low-side MOSFETs. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Requirements The evaluation board consists of the driver, external MOSFETs, and an output LC filter to duplicate the power stage of a synchronous buck converter. When a pulse generator drives the MIC4600 inputs, the output voltage depends on the input duty cycle and PVIN voltage. The evaluation board may also be connected to a PWM control IC or µC, where the output voltage is regulated with closed loop control. The maximum output voltage is limited to 6V by the output capacitor (C6) voltage rating. Higher output voltages are possible if C6 is replaced with a suitable capacitor. In addition to the input drive signals, the MIC4600 evaluation board requires a PVIN power supply with an output between 4.5V and 28V and a load connected to the output. Precautions The evaluation board does not have reverse polarity protection. Applying a negative voltage to the PVIN (J1) terminal may damage the device. Do not exceed 28V on the input to prevent damage to the driver. Do not exceed 6V on the output to prevent damage to the output capacitor. The enable pin is pulled up to PVIN. If an external signal is connected to EN, make sure it can withstand PVIN. If not, R1 may be removed or the enable pin must be buffered. Ordering Information Part Number Description MIC4600YML EV MIC4600YML Evaluation Board Evaluation Board Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com October 14, 2015 Revision 1.1 Micrel, Inc. MIC4600 Evaluation Board Circuit Description Getting Started EN, HSI, and LSI Inputs The input signals can be injected at terminal J5/JP3 (HSI) and J6/JP4 (LSI). The EN signal can be injected at terminal J7/JP2. All inputs are TTL compatible. The maximum HSI and LSI signal amplitude is VDD (5V nominal). The maximum EN pin amplitude is PVIN. The EN pin is pulled up to PVIN through resistor R1. Do not leave the HSI or LSI pins floating. Connect the input supply. Connect the input supply to the PVIN (J1) and Ground (J2) terminals. Pay careful attention to the polarity and supply voltage range (28V maximum operating). An ammeter may be placed between the input supply and the PVIN terminal to measure input current. Connect the output load Connect a resistive or electronic load to the evaluation board output (J3) and ground (J4) terminals. Do not exceed 6V on the output unless C6 is replaced with a higher voltage capacitor. Fault Pin The FAULT pin asserts low during an overtemperature condition. The pin is pulled up to VDD through R2 and may be monitored at terminal J8/JP1. By removing R2, the FAULT pin may be pulled up to an external voltage. Do not exceed a pull-up voltage of VDD. Enable the MIC4600. The enable pin (J7/JP2) is pulled up to PVIN with a 100kΩ resistor. The evaluation board does not require an external enable signal to turn on. The output turns on when PVIN exceeds the input UVLO threshold. The output is turned off by pulling the EN pin low. Single Input (PWM) Mode The MIC4600 may be driven with a single input on the HSI pin. The LSI pin must first be pulled high to VDD by shorting header JP6. In this mode, the HSI pin controls both the high-side and low-side MOSFETs in a synchronous manner. When HSI goes high, the low-side MOSFET, Q1, is turned off and the high-side MOSFET, Q2, is then turned on. When HSI goes low, Q2 is first turned off and then Q1 is turned on. The internal anti-shoot-through circuitry prevents both MOSFETs from being on at the same time. Additional delay during the transition can be adjusted with R3. Please see the MIC4600 datasheet for additional details. October 14, 2015 2 Revision 1.1 Micrel, Inc. MIC4600 Evaluation Board Evaluation Board Schematic October 14, 2015 3 Revision 1.1 Micrel, Inc. MIC4600 Evaluation Board Bill of Materials Item C1, C8 C2, C5 Part Number 06036D105MAT2A C1608X5R1V225M080AC Manufacturer (1) AVX (2) TDK Panasonic (3) Description Qty. 1µF, 6.3V, X5R, Ceramic Capacitor 2 2.2µF, 50V, X5R, Ceramic capacitor 2 100µF, 50V, Al. El. 1 C3 EEU-FM1H101B C4 06033D107MAT2A AVX 0.1µF, 25V, X5R, Ceramic Capacitor 1 C7 06035C102KAT2A AVX 1nF, 50V, X7R, Ceramic Capacitor 1 C6 C3216X5R0J107M160AB TDK 100µF, 6.3V, X5R, Ceramic Capacitor 1 10kΩ (0603 size), 1% 3 R1, R2, R5 CRCW06031002FRT1 R3 CRCW06031053FRT1 Vishay Dale 105kΩ (0603 size), 1% 1 R4 CRCW06032R20JNEA Vishay Dale 2.2Ω (0603 size), 5% 1 R6, R7 CRCW0600000FRT1 Vishay Dale 0Ω (0603 size) 2 R8 CRCW08051R21FRT1 Vishay Dale 1.21Ω (0603 size), 1% 1 D1 Q1, Q2 L1 U1 B0540W-7-F FDS6612A CDEP105NP-5R0MC-50 MIC4600YML Vishay Dale (4) Diodes Inc. 40V, 0.5A, Schottky, SOD123 1 (6) MOSFET 2 (7) 4.8µH, 7A, Inductor 1 28V Half-Bridge MOSFET Driver 1 Fairchild Sumida (5) (8) Micrel, Inc. Notes: 1. AVX: www.avx.com. 2. TDK: www.tdk.com. 3. Panasonic: www.panasonic.com. 4. Vishay: www.vishay.com. 5. Diodes Inc.: www.diodes.com. 6. Fairchild: www.fairchildsemi.com. 7. Sumida: www.sumida.com. 8. Micrel, Inc.: www.micrel.com. October 14, 2015 4 Revision 1.1 Micrel, Inc. MIC4600 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer October 14, 2015 5 Revision 1.1 Micrel, Inc. MIC4600 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. October 14, 2015 6 Revision 1.1