MPM3620GQV-P

MPM3620 The Future of Analog IC Technology 24V Input 2A Module Synchronous Step-Down Converter with Integrated Inductor DESCRIPTION FEATURES The MPM3620 is a synchronous rectified, stepdown module converter with built-in power MOSFETs, inductor, and two capacitors. It offers a compact solution that requires only 5 external components to achieve a 2A continuous output current with excellent load and line regulation over a wide input-supply range. Also, it provides fast load transient response. An external AAM pin provides selectable power-save mode and forced PWM mode. • • • • Full protection features include over-current protection(OCP) and thermal shut down(TSD). MPM3620 eliminates design and manufacturing risks while dramatically improving time-tomarket. The MPM3620 is available in a space-saving QFN-20 (3mmx5mmx1.6mm) package. • • • • • • • • 4.5V-to-24V Operating Input Range 2A Continuous Load Current 200μA Low Quiescent Current 90mΩ/40mΩ Low RDS(ON) Internal Power MOSFETs Integrated Inductor Integrated VCC and Bootstrap Capacitors External AAM for Power-Save Mode Programming Over-Current Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in QFN-20 (3mmx5mmx1.6mm) Package Total solution size 6.7mmx6.3mm APPLICATIONS • • • • • Industrial Controls Medical and Imaging Equipment Telecom and Networking Applications LDO Replacement Space and Resource-limited Applications All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency vs. Load Current VOUT =3.3V 100 90 12VIN 80 24VIN 19VIN 70 60 50 40 30 0.01 0.1 1 LOAD CURRENT (A) MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 10 1 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR ORDERING INFORMATION Part Number* MPM3620GQV Package QFN-20 (3mmx5mmx1.6mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MPM3620GQV–Z); TOP MARKING MP: MPS prefix: Y: year code; W: week code: 3620 first four digits of the part number; LLL: lot number; M: module PACKAGE REFERENCE MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 2 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................ -0.3V to 28V VOUT ............................................... -0.3V to 28V VSW .................................................................... -0.3V (-5V for 2.5V) to force the MPM3620 always operate in CCM. If the AAM voltage is set lower than the recommended value, then stability and ripple improve, however, efficiency during AAM mode Figure 10. Recommended AAM Resistor Selection Selecting the Output Capacitor The output capacitor (C2) maintains the DC output voltage. Use ceramic, tantalum, or low ESR electrolytic capacitors. For best results, use low ESR capacitors to keep the outputvoltage ripple low. The output-voltage ripple is estimated as: ΔVOUT = VOUT ⎛ VOUT × ⎜1 − fS × L1 ⎝ VIN ⎞ ⎛ ⎞ 1 ⎟ × ⎜ RESR + ⎟ 8 × f × C2 S ⎠ ⎝ ⎠ MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 18 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Where L1 is the inductor value, RESR is the equivalent series resistance (ESR) value of the output capacitor, and L1=1μH. VIN ΔVOUT = VOUT ⎛ V ⎞ × 1 − OUT ⎟ × RESR fS × L1 ⎜⎝ VIN ⎠ PGND NC BST NC VCC R2 PGND IN EN AAM R1 NC PGND NC FB AGND NC C2 For tantalum or electrolytic capacitors, the ESR dominates the impedance at the switching frequency. For simplification, the output ripple can be approximated as: 6.7mm ΔVOUT ⎛ V ⎞ VOUT = × ⎜ 1 − OUT ⎟ 2 VIN ⎠ 8 × fS × L1 × C2 ⎝ VOUT C1 R3 For ceramic capacitors, the capacitance dominates the impedance at the switching frequency; the capacitance causes the majority of the output-voltage ripple. For simplification, the output-voltage ripple can be estimated as: GND SW OUT 6.3mm Top Layer The characteristics of the output capacitor affect the stability of the regulation system. The MPM3620 internal compensation is optimized for a wide range of capacitance and ESR values. PCB Layout Guidelines (13) Efficient PCB layout is critical to achieve stable operation, particularly for input capacitor placement. For best results, refer to Figure 11 and follow the guidelines below: 1. Use large ground plane to connect directly to PGND. If the bottom layer is ground plane, add vias near PGND. 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. Keep the input capacitor and IN connection as short and wide as possible. 3. Place the external feedback resistors next to FB. 4. Keep the feedback network away from the switching node. Bottom Layer Figure 11. Recommended PCB Layout Notes: 13) The recommended layout is based on the “Typical Application Circuits” on pages 21-23. MPM3620 Rev. 1.0 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 19 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR Design Example Table 2 below is a design example following the application guidelines for the specifications: Table 2. Design Example VIN VOUT Io 12V 3.3V 2A The detailed application schematic is shown in Figure 13. 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. MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 20 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS (14)(15) Figure 12. VOUT=5V, IOUT=2A Figure 13. VOUT=3.3V, IOUT=2A Figure 14. VOUT=2.5V, IOUT=2A MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 21 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS (continued) Figure 15. VOUT=1.8V, IOUT=2A Figure 16. VOUT=1.5V, IOUT=2A Figure 17. VOUT=1.2V, IOUT=2A MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 22 MPM3620 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR TYPICAL APPLICATION CIRCUITS (Continued) Figure 18. VOUT=1V, IOUT=2A Notes: 14) In 12VIN to 1VOUT application conditions, the HS-FET’s on-time is close to the minimum on-time; although the SW may have a little jitter, the output-voltage ripple is smaller than 15mV in PWM mode. 15) In 12VIN to 1.5/1.2/1 VOUT application conditions, the BST operation current will charge the output voltage higher than the setting value when there is completely no load, due to a large divider resistor value. A 10µA load current can pull the output voltage to a normal regulation level. MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 23 MPM3620 – 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. MPM3620 Rev. 1.1 www.MonolithicPower.com 2/12/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2015 MPS. All Rights Reserved. 24