EVBL9840-L-00A

EVBL9840-L-00A 36V, 3.5A, Low IQ, Synchronous, Step-Down Switch-Mode Convertor Evaluation Board DESCRIPTION FEATURES The EVBL9840-L-00A is an evaluation board designed to demonstrate the capabilities of the MP9840 and the MPQ9840. The evaluation board features an integrated MPS power inductor.  The MP9840 is a configurable-frequency (350kHz to 2.5MHz), synchronous, step-down switch-mode converter with integrated, internal power MOSFETs. It can achieve up to 3.5A of highly efficient output current (IOUT) across a wide 3.3V to 36V input voltage (VIN) range, with current mode control for fast loop response. Advanced asynchronous modulation (AAM) mode achieves high efficiency under light-load conditions by scaling down the switching frequency (fSW) to reduce the switching and gate driver losses. The EV9840-L-00A is a fully assembled and tested evaluation board that generates 3.3V of output voltage (VOUT) and up 3.5A of load current across the entire VIN range. ELECTRICAL SPECIFICATIONS Parameter Input voltage Output voltage Output current Symbol VIN VOUT IOUT Value 3.3 to 36 3.3 3.5 Units V V A                Wide 3.3V to 36V Operating Input Voltage (VIN) Range Up to 3.5A Continuous Output Current(IOUT) 2μA Low Shutdown Current (ISD) 14μA Sleep Mode Quiescent Current (IQ) 125mΩ and 55mΩ Internal Power MOSFETs Synchronous Mode for High Efficiency 350kHz to 2.5MHz Configurable Switching Frequency (fSW) Selectable In-Phase or 180° Out-of-Phase External SYNC Clock Power Good (PG) Indication Configurable Soft-Start Time (tSS) 80ns Minimum On Time Selectable Forced Continuous Conduction Mode (FCCM) and Advanced Asynchronous Modulation (AAM) Mode Low-Dropout (LDO) Mode Over-Current Protection (OCP) with ValleyCurrent Detection and Hiccup Mode Thermal Shutdown Available in Wettable Flank Package Fully Assembled and Tested Optimized Performance with MPS Inductor MPL-AL6060 Series APPLICATIONS   Automotive Systems Industrial Power Systems 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 trademarks of Monolithic Power Systems, Inc. or its subsidiaries. EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 1 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVBL9840-L-00A EVALUATION BOARD Efficiency vs. Load Current vs. Power Loss 95% 2.10 90% 1.80 85% 1.50 80% 1.20 EFFICIENCY 2.40 75% VIN=8V VIN=12V VIN=24V VIN=36V 70% 65% 60% 0.60 0.30 0.00 1 LxWxH (2.5cmx2.5cmx0.2cm) Board MPS IC MPS Number Number Inductor EVBL9840- MP9840GL, MPLL-00A MPQ9840GL AL6060-100 0.90 POWER LOSS (W) VOUT = 3.3V, AAM mode 100% 10 100 1000 LOAD CURRENT (mA) EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 2 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD QUICK START GUIDE 1. Connect load terminals to: a. Positive (+): VOUT b. Negative (-): GND 2. Preset the power supply output to between 3.3V and 36V. Be aware that electronic loads represent a negative impedance to the converter, which can trigger hiccup mode if the current exceeds 5.6A. 3. Turn off the power supply. If longer cables (>0.5m total) are being used between the source and the evaluation board, install a damping capacitor at the input terminals. This is critical when VIN exceeds 24V. 4. Connect power supply terminals to: a. Positive (+): VIN b. Negative (-): GND 5. Turn on the power supply. The evaluation board should start up automatically. 6. To use the enable (EN) function, apply a digital input to the EN pin. Drive EN above 1.05V to turn the converter on; drive EN below 0.93V to turn it off. 7. The switching frequency (fSW) can be configured via an external resistor (RFREQ). RFREQ can be estimated with Equation (1): RFREQ (kΩ)  170000 fSW 1.11(kHz) (1) 8. To use the synchronous (SYNC) function, apply a 350kHz to 2.5MHz clock to the SYNC pin to synchronize fSW to the external clock. The external clock should be at least 250kHz above fSW. 9. The SYNC pin also selects either forced continuous conduction mode (FCCM) or advanced asynchronous modulation (AAM) mode. Drive SYNC high to make the device operate in FCCM; drive SYNC low or float SYNC to have it operate in AAM mode. 10. The output voltage is set by the external resistor divider (RFB1 + RFB2). Choose RFB1 to be about 40kΩ. Then RFB2 can be calculated with below Equation (2): RFB2  RFB1 (2) VOUT 1 0.8V Figure 1 shows the feedback circuit. MPQ9840 FB RFB1 VOUT RFB2 Figure 1: Feedback Circuit EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 3 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD Table 1 lists the recommended feedback resistor values for common output voltages. Table 1: Recommended Resistor Values for Common Output Voltages VOUT (V) RFB1 (kΩ) RFB2 (kΩ) 1.8 41.2 (1%) 33 (1%) 2.5 41.2 (1%) 19.6 (1%) 3.3 41.2 (1%) 13 (1%) 5 41.2 (1%) 7.68 (1%) 12 41.2 (1%) 2.94 (1%) EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 4 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVALUATION BOARD SCHEMETIC FB1 NS 3.3V to 36V VEMI L3 Short L1 NS VOUT VIN CIN1 NS CIN2 NS CIN3 NS CIN4 NS 0805 CIN6 NS CIN6 is for Damping the C and L Inputs CIN5 NS GND Output EMC Filter R5 for EMC R5 11 20Ω 1210 50V 1210 50V C1C 0.1µF 0603 50V C1D 0.1µF 0603 50V 1.05V 0.12V Hysterisis EN SYNC SYNC: SYNC = High (FCCM) SYNC = GND or Floating (AAM Mode) Clock: 1.8V = High R4 fSW 249kΩ 350 169kΩ 500 82kΩ 1MHz 36.5kΩ 2MHz 27kΩ 2.5MHz BST SW D1 NS C4 0.1µF 3, 10 5 R2 NS SYNC BIAS 14 SS C3 4.7nF 8 C2A 22µF 1210 16V PG 7 High if VOUT is within +/-10% VOUT GND VOUT (V) R7 (kΩ) 1.8 41.2 (1%) 33 (1%) 2.5 41.2 (1%) 19.6 (1%) C7 0.1µF C2B 22µF 1210 16V R9 R7/R8 = 1MΩ/316kΩ 10Ω for Lowest Input IQ For R < 100kΩ: Connect to 5V to 18V, or Float if Not in Use PHASE 450kHz 16 FREQ R4 191kΩ R7 1MΩ R8 316kΩ C5 10pF U1 GND to 180° 1 C8 NS 0.8V FB 15 MPQ9840 6 L2 10µH R3 NS EN D1 is Optional for High Duty Cycles MPL-AL6060-100 R1 100kΩ AGND C1B 10µF VIN 13 C1A 10µF 2 4, 9 PGND VIN VOUT _EMI C2D NS GND Input EMC Filter 3.3V to 36V 3.3V/3.5A C2C NS R8 (kΩ) 3.3 41.2 (1%) 13 (1%) 5 41.2 (1%) 7.68 (1%) 12 41.2 (1%) 2.94 (1%) PG R6 100kΩ VCC 12 C6 1µF Float SS = 700μs CSS = 4.7nF: 700μs 10nF: 1.1ms 22nF: 2.42ms tSS = CSS(nF) x 0.11ms Figure 2: Evaluation Board Layout EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 5 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD PACKAGE REFERENCE TOP VIEW FREQ 16 FB SS AGND 15 14 13 PHASE 1 12 VCC VIN 2 11 BST SW 3 10 SW PGND 4 9 5 EN 6 SYNC 7 PG PGND 8 BIAS QFN-16 (3mmx3mm) EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 6 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVBL9840-L-00A BILL OF MATERIALS Qty Ref 1 L2 2 C1A, C1B 2 C1C, C1D 2 C2A, C2B 1 C3 2 C4, C7 1 C5 1 C6 9 1 1 1 1 2 1 1 1 1 1 2 5 5 1 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6, C2C, C2D, C8 D1 FB1 L1 L3 R1, R6 R4 R5 R7 R8 R9 R2, R3 VIN, VEMI, GND, VOUT, GND EN, GND, SYNC, GND, PG U1 Value Description MPLInductor, 10μH, 27mΩ AL6060DCR, 7A 100 Ceramic capacitor, 50V, 10μF X7R Ceramic capacitor, 50V, 0.1μF X7R Ceramic capacitor, 25V, 22μF X7R Ceramic capacitor, 50V, 4.7nF X7R Ceramic capacitor, 16V, 0.1μF X7R Ceramic capacitor, 50V, 10pF C0G Ceramic capacitor, 16V, 1μF X7R Package Manufacturer Manufacturer PN SMD MPS MPL-AL6060-100 1210 Murata GRM32ER71H106KA12L 0603 Murata GRM188R71H104KA93D 1210 Murata GRM32ER71H226KE15L 0603 TDK C1608X7R1H472K 0603 Murata GRM188R71C104KA01D 0603 TDK C1608C0G1H100D 0603 TDK C1608X7R1C105K Film resolution, 5% Film resolution, 1% Film resolution, 1% Film resolution, 1% Film resolution, 1% Film resolution, 5% 0603 0603 0603 0603 0603 0603 Yageo Yageo Yageo Yageo Yageo Yageo RC0603JR-07100KL RC0603FR-07191KL RC0603FR-0720RL RC0603FR-071ML RC0603FR-07316KL RC0603JR-0710RL 2mm 2mm golden pin, test point DIP Custom (1) 1mm 1mm golden pin, test point DIP Custom (1) QFN-16 (3mmx 4mm) MPS NS NS NS NS Short 100kΩ 191kΩ 20Ω 1MΩ 316kΩ 10Ω NS MP9840 Synchronous, step-down converter, 36V, 3.5A MP9840GL Note: 1) These pins are custom-made by MPS. For more information, contact an MPS FAE. EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 7 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS Efficiency vs. Load Current vs. Power Loss VOUT = 3.3V, AAM mode VOUT = 3.3V, FCCM 95% 2.10 90% 1.80 85% 1.50 80% 1.20 VIN=8V VIN=12V VIN=24V VIN=36V 70% 65% 0.90 0.60 0.30 60% 0.00 1 10 100 1000 VIN=8V VIN=12V VIN=24V VIN=36V 1 LOAD CURRENT (mA) VOUT = 5V, FCCM 2.00 90% 1.60 VIN=8V VIN=12V VIN=24V VIN=36V 75% 1.20 0.80 0.40 70% 0.00 10 100 1000 LOAD CURRENT (mA) 100% 90% 2.50 2.25 80% 70% 60% 2.00 1.75 1.50 EFFICIENCY 95% EFFICIENCY 2.40 POWER LOSS (W) VOUT = 5V, AAM mode 1 1000 Efficiency vs. Load Current vs. Power Loss 100% 80% 100 LOAD CURRENT (mA) Efficiency vs. Load Current vs. Power Loss 85% 10 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 VIN=8V VIN=12V VIN=24V VIN=36V 50% 40% 30% 20% 10% 1.25 1.00 0.75 0.50 0.25 0% POWER LOSS (W) 75% 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% EFFICIENCY 2.40 EFFICIENCY 100% POWER LOSS (W) Efficiency vs. Load Current vs. Power Loss POWER LOSS (W) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. 0.00 1 10 100 1000 LOAD CURRENT (mA) EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 8 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. Steady State Steady State VIN = 12V, VOUT = 3.3V, IOUT = 1mA, AAM mode VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM CH3: VPG CH3: VPG CH1: VSW CH1: VSW CH2: VOUT/AC CH2: VOUT/AC CH4: IL CH4: IL Steady State Start-Up VIN = 12V, VOUT = 3.3V, IOUT = 3.5A VIN = 12V, VOUT = 3.3V, IOUT = 0A, AAM mode CH3: VPG CH3: VIN CH1: VSW CH1: VSW CH2: VOUT/AC CH2: VOUT CH4: IL CH4: IL Start-Up Start-Up VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM VIN = 12V, VOUT = 3.3V, IOUT = 3.5A CH3: VIN CH3: VIN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 9 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. Shutdown Shutdown VIN = 12V, VOUT = 3.3V, IOUT = 0A, AAM mode VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM CH3: VIN CH3: VIN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL Shutdown Start-Up through EN VIN = 12V, VOUT = 3.3V, IOUT = 3.5A VIN = 12V, VOUT = 3.3V, IOUT = 0A, AAM mode CH3: VEN CH3: VIN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL Start-Up through EN Start-Up through EN VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM VIN = 12V, VOUT = 3.3V, IOUT = 3.5A CH3: VEN CH3: VEN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 10 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. Shutdown through EN Shutdown through EN VIN = 12V, VOUT = 3.3V, IOUT = 0A, AAM mode VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM CH3: VEN CH3: VEN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL Shutdown through EN SCP Entry VIN = 12V, VOUT = 3.3V, IOUT = 3.5A VIN = 12V, VOUT = 3.3V, IOUT = 3.5A, AAM mode CH3: VPG CH3: VEN CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL SCP Entry SCP Entry VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM VIN = 12V, VOUT = 3.3V, IOUT = 3.5A CH3: VPG CH3: VPG CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 11 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. SCP Steady State SCP Recovery VIN = 12V VIN = 12V, VOUT = 3.3V, IOUT = 0A, AAM mode CH3: VPG CH3: VPG CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL SCP Recovery SCP Recovery VIN = 12V, VOUT = 3.3V, IOUT = 0A, FCCM VIN = 12V, VOUT = 3.3V, IOUT = 3.5A CH3: VPG CH3: VPG CH1: VSW CH1: VSW CH2: VOUT CH2: VOUT CH4: IL CH4: IL CH2: VOUT/AC Load Transient Cold Crank VIN = 12V, VOUT = 3.3V, IOUT = 1.5A to 3.5A VIN = 12V to 3.3V to 5V, IOUT = 0A, AAM mode CH3: VIN CH1: VSW CH2: VOUT CH4: IOUT CH4: IL EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 12 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD EVB TEST RESULTS (continued) VIN = 12V, VOUT = 3.3V, L = 10µH, fSW = 450KHz, TA = 25°C, unless otherwise noted. VIN Ramps Down and Up Cold Crank VIN = 18V to 3.5V to 0V to 3.5V to 18V, IOUT = 0A VIN = 12V to 3.3V to 5V, IOUT = 3.5A CH3: VIN CH3: VIN CH1: VSW CH1: VSW CH2: VOUT CH4: IL CH2: VOUT CH4: IL VIN Ramps Down and Up Load Dump VIN = 18V to 3.5V to 0V to 3.5V to 18V, IOUT = 3.5A CH3: VIN CH1: VSW VIN = 12V to 36V to 12V, IOUT = 3.5A CH3: VIN CH1: VSW CH2: VOUT CH4: IL CH4: IL CH2: VOUT EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 13 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD PCB LAYOUT Figure 3: Top Silk and Top Layer Figure 4: Mid-Layer 1 Figure 5: Mid-Layer 2 Figure 6: Bottom Layer and Bottom Silk EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 14 EVBL9840-L-00A – 36V, 3.5A, LOW IQ, SYNC STEP-DOWN CONVERTER EVAL BOARD REVISION HISTORY Revision # 1.0 1.1 Revision Date Description Pages Updated 10/18/2019 Initial Release Updated the Quick Start Guide section 3–4 Updated the soft-start time (tSS) formula in Figure 2 from 5 “TSS=CSS(nF)*0.08ms” to “TSS = CSS(nF) x 0.11ms” 9/16/2021 Updated the EVBL9840-L-00A Bill of Materials section 7 Grammar and formatting updates; updated headers and All footers; updated figure titles; updated pagination 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. EVBL9840-L-00A Rev. 1.1 MonolithicPower.com 9/16/2021 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2021 MPS. All Rights Reserved. 15