MPM3610AGQV-P

MPM3610A The Future of Analog IC Technology 21V/1.2A DC/DC Module Synchronous Step-Down Converter with Integrated Inductor DESCRIPTION FEATURES The MPM3610A is a synchronous rectified, step-down module converter with built-in power MOSFETs, inductor, and two capacitors. It offers a very compact solution, requires only 5 external components to achieve a 1.2A continuous output current with excellent load and line regulation over a wide input supply range and provides fast load transient response. • • • Full protection features include over-current protection and thermal shut-down. MPM3610A eliminates design and manufacturing risks while dramatically improving time-to-market. The MPM3610A is available in a space-saving QFN20 (3mmx5mmx1.6mm) package. • • • • • • • • • 4.5V-to-21V Operating Input Range 1.2A Continuous Load Current 90mΩ/40mΩ Low RDS(ON) Internal Power MOSFETs Integrated Inductor Integrated VCC and Bootstrap Capacitors Power Save Mode at Light Load Power Good Indicator OCP Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in QFN20 (3x5x1.6mm) Package Total solution size 6.7mm x7.3mm APPLICATIONS • • • • • Industrial Controls Medical and Imaging Equipment Telecom and Networking Applications LDO Replacement Space and Resource-limited Applications All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page. “MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 100 90 80 70 60 50 40 30 20 10 0 0.01 0.1 MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 10 1 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR ORDERING INFORMATION Part Number* MPM3610AGQV Package QFN-20 (3mmx5mmx1.6mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MPM3610AGQV–Z); TOP MARKING MP: MPS prefix: Y: year code; W: week code: 3610A: first five digits of the part number; LLL: lot number; M: module; MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................ -0.3V to 28V VSW .................................................................... -0.3V (-5V for 1V, when VFB is above 90% of VREF, the PG pin will be pulled high after 35µs delay time. During normal operation, the PG pin will be pulled low when the VFB drops below 83% of VREF after 80µs delay. When UVLO or OTP happens, the PG pin will be pulled low immediately; When OC(Over current) happens, the PG pin will be pulled low when VFB drops below 83% of VREF after 80µs delay. Since MPM3610A doesn’t implement dedicate output over voltage protection, the PG won’t response to output over voltage condition. Over-Current-Protection and Hiccup The MPM3610A has a cycle-by-cycle overcurrent limiting control. When the inductor current peak value exceeds internal “peak” current limit threshold, the HS-FET will turn off and the LS-FET will turn on and remains on until the inductor current falls below the internal “valley” current limit threshold. The “valley” current limit circuit is employed to decrease the MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 14 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR operation frequency after the “peak” current limit threshold is triggered. Meanwhile, the output voltage drops until VFB is below the Under-Voltage (UV) threshold—typically 50% below the reference. Once UV is triggered, the MPM3610A enters hiccup mode to periodically restart the part. This protection mode is especially useful when the output is deadshorted to ground, and greatly reduces the average short circuit current to alleviate thermal issues and protect the converter. The MPM3610A exits the hiccup mode once the over-current condition is removed. Thermal Shutdown Thermal shutdown prevents the chip from operating at exceedingly high temperatures. When the silicon’s temperature exceeds 150°C, the whole chip is shut down. When the temperature drops below its lower threshold, typically 130°C, the chip is enabled again. Floating Driver and Bootstrap Charging An internal bootstrap capacitor powers the floating power MOSFET driver. This floating driver has its own UVLO protection. This UVLO’s rising threshold is 2.2V with a hysteresis of 150mV. The bootstrap capacitor voltage is regulated internally by VIN through D1, M1, C4, L1 and C2 (Figure 5). If (VBST-VSW) exceeds 5V, U1 will regulate M1 to maintain a 5V voltage across C4. shutdown procedure, the signaling path is first blocked to avoid any fault triggering. The COMP voltage and the internal supply rail are then pulled down. The floating driver is not subject to this shutdown command. Additional RC Snubber Circuit Additional RC snubber circuit can be chosen to damp the device’s spike and ringing voltage to get better EMI performance. The power dissipation of the RC snubber circuit can be simply estimated by the formula below: PLoss = fS × CS × VIN2 Where fS is the switching frequency; Cs is the snubber capacitor; VIN is the input voltage. For efficiency consideration, the value of CS should not be set too large. Commonly a 5.6Ω RS and a 330pF CS is recommended to generate the RC snubber circuit. Figure 6: Additional RC Snubber Circuit Figure 5: Internal Bootstrap Charging Circuit Startup and Shutdown If both VIN and VEN exceeds its thresholds, the chip starts. The reference block starts first, generating stable reference voltage, and then the internal regulator is enabled. The regulator provides a stable supply for the remaining circuitries. Three events can shut down the chip: VIN low, VEN low and thermal shutdown. During the MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 15 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR APPLICATION INFORMATION Setting the Output Voltage The external resistor divider sets the output voltage (see Typical Application on page 1). Choose R1 refer to Table 1, R2 is then given by: R2 = R1 VOUT 0.798V −1 Figure 7: Feedback Network Table 1 lists the recommended feedback network parameters for common output voltages. Table 1: Recommended Parameters For Common Output Voltages Small Solution Size(CIN=10µF/0805/25V, COUT=22µF/0805/16V) VIN VOUT R1 (V) (V) (kΩ) 21 19 16 14 12 R2 (kΩ) Cf (pF) Load VOUT Ripple Transient (9) (10) (mV) (mV) Low VOUT Ripple(CIN=10µF/0805/25V, COUT=2X22µF/0805/16V) R1 (kΩ) R2 Cf (kΩ) (pF) Load VOUT Ripple Transient (9) (10) (mV) (mV) 5 115 22 NS 17.6 119 40.2 7.68 NS 9.4 74 3.3 102 32.4 NS 12.4 73 62 19.6 NS 7 50 2.5 102 47.5 5.6 10 48 62 29.4 5.6 5.2 31 5 115 22 NS 16.4 116 40.2 7.68 NS 8.8 72 3.3 102 32.4 NS 11.4 73 62 19.6 NS 6.6 51 2.5 102 47.5 5.6 9.8 51 62 29.4 5.6 5 33 5 115 22 NS 15.6 116 40.2 7.68 NS 7.8 69 3.3 102 32.4 NS 10.6 72 62 19.6 NS 6 53 2.5 102 47.5 5.6 9.6 52 62 29.4 5.6 4.8 36 1.8 102 82 5.6 8.6 41 62 49.9 5.6 4 30 5 115 22 NS 14.8 110 40.2 7.68 NS 7.4 65 3.3 102 32.4 NS 10.2 72 40.2 12.7 NS 5.6 41 2.5 75 34.8 5.6 9.4 46 40.2 18.7 5.6 4.6 34 1.8 102 82 5.6 8.4 42 62 49.9 5.6 4.2 31 1.5 158 180 5.6 7.2 44 62 69.8 5.6 3.6 30 5 100 19.1 NS 13.8 93 34 6.49 NS 6.4 56 3.3 75 24 NS 9.4 61 40.2 12.7 NS 5.2 40 2.5 75 34.8 5.6 9 51 40.2 18.7 5.6 4.4 34 1.8 102 82 5.6 7.8 47 47 37.4 5.6 4 29 1.5 158 180 5.6 6.6 57 47 53.6 5.6 3.4 27 1.2 158 316 5.6 6.2 51 75 147 5.6 3 32 MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 16 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Table 1: Recommended Parameters For Common Output Voltages (continued) Small Solution Size(CIN=10µF/0805/25V, COUT=22µF/0805/16V) VIN VOUT R1 (V) (V) (kΩ) 10 8 5 R2 (kΩ) Cf (pF) Load VOUT Ripple Transient (9) (10) (mV) (mV) Low VOUT Ripple(CIN=10µF/0805/25V, COUT=2X22µF/0805/16V) R1 (kΩ) R2 Cf (kΩ) (pF) Load VOUT Ripple Transient (9) (10) (mV) (mV) 5 100 19.1 NS 13.2 77 34 6.49 NS 6.2 47 3.3 75 24 NS 8.4 58 40.2 12.7 NS 4.8 40 2.5 75 34.8 5.6 8.2 51 40.2 18.7 5.6 4 34 1.8 75 59 5.6 7.2 40 47 37.4 5.6 3.6 30 1.5 102 115 5.6 6 46 47 53.6 5.6 3.2 28 1.2 102 205 5.6 5.4 45 62 124 5.6 2.8 32 1 102 402 5.6 4.8 41 82 324 5.6 2.6 36 5 100 19.1 NS 9.2 76 34 6.49 NS 5 48 3.3 75 24 NS 7.6 57 40.2 12.7 NS 3.8 38 2.5 75 34.8 5.6 7 48 40.2 18.7 5.6 3.4 33 1.8 75 59 5.6 6.4 42 47 37.4 5.6 3 32 1.5 75 84.5 5.6 5.4 44 47 53.6 5.6 2.8 29 1.2 75 147 5.6 5 38 47 93.1 5.6 2.6 26 1 75 294 5.6 4.6 35 56 221 5.6 2.2 29 3.3 75 24 NS 6 57 40.2 12.7 NS 3.4 40 2.5 75 34.8 5.6 5.8 52 40.2 18.7 5.6 3.2 32 1.8 75 59 5.6 5.2 47 47 37.4 5.6 2.8 31 1.5 62 69.8 5.6 5 41 47 53.6 5.6 2.4 30 1.2 62 124 5.6 4.6 37 47 93.1 5.6 2.2 29 1 62 243 5.6 4.4 37 47 187 5.6 2 27 Notes: 9) The output voltage ripple is tested at 1.2A output current. 10) Load transient from 0.6A to 1.2A, slew rate =0.8A/µs. Normally output voltage is recommended to be set from 0.8V to 5.5V. Actually it can be set larger than 5.5V. Output voltage ripple will be larger in this case due to larger inductor ripple current. Additional output capacitor is needed to reduce the output ripple voltage. When output voltage is high, the chip’s heat dissipation become more important, please refer to PC Board layout guidelines on page 18 to achieve better thermal effect. Selecting the Input Capacitor The input current to the step-down converter is discontinuous, therefore requires a capacitor to supply the AC current to the step-down converter while maintaining the DC input voltage. Use low ESR capacitors for the best performance. Use ceramic capacitors with X5R or X7R dielectrics for best results because of their low ESR and small temperature coefficients. For most applications, use a 10µF capacitor. MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 17 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Since C1 absorbs the input switching current, it requires an adequate ripple current rating. The RMS current in the input capacitor can be estimated by: I C1 = ILOAD × VOUT ⎛⎜ VOUT × 1− VIN ⎜⎝ VIN ⎞ ⎟ ⎟ ⎠ For simplification, choose an input capacitor with an RMS current rating greater than half of the maximum load current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum capacitors, add a small, high quality ceramic capacitor (e.g. 0.1μF) placed as close to the IC as possible. When using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. The input voltage ripple caused by capacitance can be estimated as: ΔVIN = ΔVOUT = ⎞ VOUT ⎛ VOUT ⎞ ⎛ 1 × ⎜1 − ⎟ × ⎜ RESR + ⎟ fS × L1 ⎝ VIN ⎠ ⎝ 8 × fS × C2 ⎠ VOUT ⎛ V ⎞ × ⎜ 1 − OUT ⎟ × RESR fS × L1 ⎝ VIN ⎠ The characteristics of the output capacitor also affect the stability of the regulation system. The MPM3610A internal compensation is optimized for a wide range of capacitance and ESR values. PC Board Layout (11) PCB layout is very important to achieve stable operation especially for input capacitor placement. For best results, follow these guidelines: 1. Use large ground plane directly connect to PGND pin. Add vias near the PGND pin if bottom layer is ground plane. 2. The high current paths (PGND, IN and OUT) should have short, direct and wide traces. Place the ceramic input capacitor close to IN and PGND pins. Keep the connection of input capacitor and IN pin as short and wide as possible. 3. The external feedback resistors should be placed next to the FB pin. 4. Keep the feedback network away from the switching node. ⎛ ⎞ ILOAD V V × OUT × ⎜ 1 − OUT ⎟ fS × C1 VIN ⎝ VIN ⎠ Selecting the Output Capacitor The output capacitor (C2) maintains the DC output voltage. Use ceramic, tantalum, or lowESR electrolytic capacitors. For best results, use low ESR capacitors to keep the output voltage ripple low. The output voltage ripple can be estimated as: ΔVOUT = frequency. For simplification, the output ripple can be approximated as: Notes: 11) The recommended layout is based on Typical Application Circuits section on page 20. Where L1 is the inductor value and RESR is the equivalent series resistance (ESR) value of the output capacitor. L1=1μH for MPM3610A. For ceramic capacitors, the capacitance dominates the impedance at the switching frequency, and the capacitance causes the majority of the output voltage ripple. For simplification, the output voltage ripple can be estimated as: ΔVOUT = ⎛ V ⎞ VOUT × ⎜ 1 − OUT ⎟ VIN ⎠ 8 × fS 2 × L1 × C2 ⎝ For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 18 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR PGND C2 NC NC PGND IN NC EN R1 R2 6.7mm C3 PG R3 Figure 10. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more device applications, please refer to the related Evaluation Board Datasheets. Top Layer Bottom Layer Figure 8: Recommend PC Board Layout Design Example Below is a design example following the application guidelines for the specifications: Table 2: Design Example VIN VOUT IOUT 12V 3.3V 1.2A The detailed application schematic is shown in MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 19 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS(12) Figure 9: Vo=5V, Io=1.2A Figure 10: Vo=3.3V, Io=1.2A Figure 11: Vo=2.5V, Io=1.2A MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 20 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS(continued) Figure 12: Vo=1.8V, Io=1.2A Figure 13: Vo=1.5V, Io=1.2A Figure 14: Vo=1.2V, Io=1.2A MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 21 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS (continued) Figure 15: Vo=1V, Io=1.2A Notes: 12) In 12VIN to 1VOUT application condition, the HS-FET’s on time is close to minimum on time, the SW may have a little jitter, even so the output voltage ripple is smaller than 15mV. MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 22 MPM3610A – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR PACKAGE INFORMATION QFN-20 (3mmx5mmx1.6mm) NOTICE: The information in this document is subject to change without notice. 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. MPM3610A Rev. 1.0 www.MonolithicPower.com 12/10/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 23