EVL8794-LE-00A

EVL8794-LE-00A High Efficiency, 20A, 16V, Synchronous Step-Down Converter Evaluation Board DESCRIPTION FEATURES The EVL8794-LE-00A is an evaluation board designed to demonstrate the capabilities of the MP8794. The MP8794 is a high-efficiency, monolithic, synchronous step-down converter.  The evaluation board can deliver 20A of continuous load current across a wide operating input range. High efficiency can be achieved across a wide output current load range. The MP8794 adopts internally compensated constant-on-time (COT) control mode that provides fast transient response and eases loop stabilization. This evaluation board can be turned on or off via a remote on/off input (EN) that is referenced to ground. This input is compatible with popular logic devices. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Units Input voltage Output voltage VIN 8 to 16 V VOUT 1 V Output current IOUT 20 A                 Wide Input Voltage Range from 2.7V: o 2.7V to 16V with External 3.3V VCC Bias o 4V to 16V with Internal VCC Bias or External 3.3V VCC Bias Differential Output Voltage Remote Sense Programmable Accurate Current Limit Level 20A Output Current Low RDS(ON) Integrated Power MOSFETs Adaptive COT for Ultra-Fast Transient Response Stable with Zero-ESR Output Capacitor Excellent Load Regulation Output Voltage Tracking Output Voltage Discharge PGOOD Active Clamped Low Level during Power Failure Programmable Soft-Start Time from 1ms Pre-Biased Start-Up Selectable Switching Frequency: 600kHz, 800kHz, or 1000kHz Non-Latch OCP, OVP, UVP, UVLO, Thermal Shutdown Output Adjustable from 0.6V to 90% of VIN, Up to 5.5V Max Available in a QFN (3mmx4mm) Package Optimized Performance with MPS Inductor MPL-AY1265 Series APPLICATIONS      FPGAs Flat-Panel Televisions and Monitors Multi-Functional Printers Access Points and Routers Optical Modules All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green status, please visit the MPS website under Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries. EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 1 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVL8794-LE-00A EVALUATION BOARD (LxWxH) 81.3mmx77.5mmx16mm Board Number MPS IC Number MPS Inductor EVL8794-LE-00A MP8794GLE MPL-AY1265-R47 EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 2 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD QUICK START GUIDE The EVL8794-LE-00A’s input voltage (VIN) can range from 8V to 16V. The minimum 8V VIN is limited by the EN signal, which is derived from VIN through a resistor divider (R4 and R6). Lower VIN values (as low as 2.7V) can be set by fine-tuning the resistor divider values, or by overdriving EN with an external control signal. To set up and use the evaluation board, follow the steps below: 1. Connect the load terminals to: a. Positive (+): VOUT b. Negative (-): GND 2. Preset the power supply output voltage between 8V and 16V, then turn off the power supply. 3. Connect the power supply output terminals to: a. Positive (+): VIN b. Negative (-): GND 4. Ensure that the power supply has a high enough current limit to supply the power. 5. Turn the power supply on. The board should automatically start up. 6. To use the enable function, apply a digital input to the EN pin. Drive EN above 1.5V to turn the regulator on; drive EN below 1V to turn it off. 7. Use R1 and R2 to set VOUT with VFB = 0.6V. Refer to the MP8794 datasheet to select the proper values for R1, R2, the inductor, and the output capacitor values when VOUT is changed. 8. Use the jumper (JP1) to select the operating frequency (600kHz, 800kHz, or 1000kHz). EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 3 EN PGOOD VCC VIGND SEN GND VIN VINSEN PGOOD VCC VI N GND GND CIN5 100μF EN 25V 1206 CIN1 10μF GND 25V 1206 CIN2 10μF 25V 1206 CIN3 10μF R5 10kΩ GND JP1 MODE 25V 0402 CIN4 1μF GND CVCC 1μF 0402 25V CIN6 1μF 8 4 9 19 10 21 EN MODE FB SW BST CS TRK/REF RGND MP8794 PGOOD VCC VIN VIN PGND PGND PGND PGND PGND PGND PGND PGND AGND GND 100kΩ R6 499kΩ R4 U1 PGND 18 17 16 15 14 13 12 11 2 GND GND 22nF C1 CREF 100nF 5 TRK 3 VSES- 4.99kΩ R2 1μF CBST 6 7 FB 20 SW 1 RBST 0Ω 3.4kΩ R1 CFB 1nF L1 0.47μH 6.3V 0805 CO4 47μF GND 6.3V 0805 CO1 47μF GND 5.23kΩ RCS CS GND VOUT MPL-AY1265-R47 SW 6.3V 0805 CO2 47μF 6.3V 0805 CO5 47μF R3 0Ω 0603 6.3V 0805 CO3 47μF 0805 6.3V CO6 47μF GND CO7 NS NS CO8 CS GND VOGNDSEN VOSENSE VOUT EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVALUATION BOARD SCHEMATIC 11 12 9 10 30kΩ R7 7 8 60.4kΩ R8 5 6 120kΩ R9 3 4 240kΩ R10 1 2 CCM600 CCM800 CCM1000 DCM800 DCM1000 DCM600 Figure 1: Evaluation Board Schematic EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 4 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVL8794-LE-00A BILL OF MATERIALS Qty Ref Value 1 C1 22nF 2 CBST, CVCC 1μF 1 CFB 1nF 3 CIN1, CIN2, CIN3 10μF 2 CIN4, CIN6 1μF 1 CIN5 100μF 0 CO1, CO2, CO3, CO4, CO5, CO6 CO7, CO8 1 CREF 100nF 1 1 2 1 1 1 1 1 1 1 1 R1 R2 R3, RBST R4 R5 R6 R7 R8 R9 R10 RCS 3.4kΩ 4.99kΩ 0Ω 499kΩ 10kΩ 100kΩ 30kΩ 60.4kΩ 120kΩ 240kΩ 5.23kΩ 1 L1 0.47μH 1 U1 MP8794 6 47μF Description Ceramic capacitor, 25V, X7R Ceramic capacitor, 16V, X7R Ceramic capacitor, 50V, X7R Ceramic capacitor, 25V, X5R Ceramic capacitor, 25V, X5R Electrolytic capacitor, 25V, ±20% Ceramic capacitor, 6.3V, X5R Package Manufacturer Manufacturer PN 0603 Wurth 885012206067 0603 Wurth 885012206052 0603 Wurth 885012206083 1206 Murata GRM188R61E106MA73L 0402 Murata GRM155R61E105KA12D DIP Nippon Chemi-Con EMZJ350ARA101MHA0G 0805 Wurth 885012107006 0603 Wurth 885012206071 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo Yageo RC0603FR-073K4L RC0603FR-074K99L RC0603FR-070RL RC0603FR-07499KL RC0603FR-0710KL RC0603FR-07100KL RC0603FR-0730KL RC0603FR-0760K4L RC0603FR-07120KL RC0603FR-07240KL RC0603FR-075K23L 13.5mmx 12.6mm MPS MPL-AY1265-R47 QFN-21 (3mmx 4mm) MPS MP8794GLE NS Ceramic capacitor, 25V, X7R Film resistor, 1%, Film resistor, 1%, Film resistor, 1% Film resistor, 1% Film resistor, 1% Film resistor, 1% Film resistor, 1% Film resistor, 1%, Film resistor, 1% Film resistor, 1% Film resistor, 1%, Inductor, DCR = 0.89mΩ, ISAT = 64A 16V, 20A, step-down converter EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 5 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS Performance waveforms are tested on the EVL8794-LE-00A evaluation board. VIN = 12V, VOUT = 1V, fSW = 800kHz, TA = 25°C, unless otherwise noted. Efficiency Efficiency PSM, 0.47μH, 800kHz FCCM, 0.47μH, 800kHz EFFICIENCY (%) EFFICIENCY (%) 100 95 90 85 80 75 70 65 60 55 50 0 5 10 15 LOAD CURRENT (A) 100 95 90 85 80 75 70 65 60 55 50 0 20 20 Switching Frequency vs. Output Current Thermal Results 800kHz, no air flow FCCM 100 1200 90 600KHz 800KHz 1000KHz 1100 80 FREQUENCY (kHz) CASE TEMPERATURE (℃) 5 10 15 LOAD CURRENT (A) 70 60 50 40 30 1000 900 800 700 600 20 10 0 2 4 6 8 10 12 14 16 18 20 LOAD CURRENT (A) 500 0 2 4 6 8 10 12 14 16 18 20 OUTPUT CURRENT (A) OUTPUT VOALTAGE (V) Output Voltage Load Regulation 1.02 1.018 1.016 1.014 1.012 1.01 1.008 1.006 1.004 1.002 1 PULSE SKIP FORCED CCM 0 5 10 15 20 LOAD CURRENT (A) EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 6 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) Performance waveforms are tested on the EVL8794-LE-00A evaluation board. VIN = 12V, VOUT = 1V, fSW = 800kHz, TA = 25°C, unless otherwise noted. Steady State Steady State IOUT = 0A, PSM IOUT = 0.5A, PSM CH1: VSW CH1: VSW CH2: VOUT/AC CH2: VOUT/AC Steady State Steady State IOUT = 20A, PSM IOUT = 0A, FCCM CH1: VSW CH1: VSW CH2: VOUT/AC CH2: VOUT/AC Steady State Load Transient IOUT = 20A, FCCM IOUT = 0A to 8A, PSM CH2: VOUT/AC CH1: VSW CH1: VSW CH2: VOUT/AC CH4: IL EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 7 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) Performance waveforms are tested on the EVL8794-LE-00A evaluation board. VIN = 12V, VOUT = 1V, fSW = 800kHz, TA = 25°C, unless otherwise noted. Load Transient Start-Up through EN IOUT = 0A to 8A, FCCM IOUT = 0A, PSM CH2: VOUT/AC CH2: VOUT CH3: VEN CH1: VPGOOD CH1: VSW CH4: IL CH4: IL Start-Up through EN Start-Up through EN IOUT = 0A, FCCM IOUT = 20A CH2: VOUT CH2: VOUT CH3: VEN CH3: VEN CH1: VPGOOD CH1: VPGOOD CH4: IL CH4: IL Shutdown through EN Shutdown through EN IOUT = 0A, PSM IOUT = 0A, FCCM CH2: VOUT CH2: VOUT CH3: VEN CH3: VEN CH1: VPGOOD CH1: VPGOOD CH4: IL CH4: IL EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 8 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) Performance waveforms are tested on the EVL8794-LE-00A evaluation board. VIN = 12V, VOUT = 1V, fSW = 800kHz, TA = 25°C, unless otherwise noted. Shutdown through EN Pre-Biased Start-Up IOUT = 20A PSM CH3: VEN CH2: VOUT CH3: VEN CH2: VOUT CH1: VPGOOD CH1: VSW CH4: VPGOOD CH4: IL Pre-Biased Start-Up Over-Current Protection Entry FCCM CH3: VEN CH2: VOUT CH2: VOUT CH1: VTRK/REF CH1: VSW CH4: IL CH4: VPGOOD Over-Current Protection Recovery CH2: VOUT CH1: VTRK/REF CH4: IL EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 9 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD PCB LAYOUT Figure 2: Top Silk Figure 3: Top Layer Figure 4: Mid-Layer 1 Figure 5: Mid-Layer 2 Figure 6: Bottom Layer Figure 7: Bottom Silk EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 10 EVL8794-LE-00A – SYNCHRONOUS STEP-DOWN CONVERTER EVAL BOARD REVISION HISTORY Revision # 1.0 Revision Date 07/27/2021 Description Initial Release Pages Updated - Notice: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. EVL8794-LE-00A Rev. 1.0 www.MonolithicPower.com 7/27/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 11