MP1591DN

EV0020 (MP1591DN) 2A, 32V, 330KHz Step-Down Converter The Future of Analog IC Technology EVALUATION BOARD DESCRIPTION The EV0020 is the evaluation board for the MP1591; a high voltage step-down converter ideal for automotive power adapter battery chargers. Its wide 6.5V to 32V input voltage range covers the automotive battery’s requirements. It achieves 2A continuous output for quick charge capability. Current mode operation provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode, the converter draws only 20µA of supply current. The MP1591 requires a minimum number of readily available external components to complete a 2A step-down DC to DC converter solution. FEATURES • • • • • • • • • • • • • • • Wide 6.5V to 32V Input Operating Range 34V Absolute Maximum Input 2A Output Current Ceramic Input and Output Capacitors Up to 95% Efficiency 20µA Shutdown Mode Fixed 330KHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Output Adjustable From 1.23V to 21V Under Voltage Lockout Automotive Power Adapters PDA and Cellular Phone Battery Chargers Distributed Power Systems Automotive Aftermarket Electronics APPLICATIONS ELECTRICAL SPECIFICATIONS Parameter Input Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 6.5 to 32 5 2 Units V V A “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. EV0020 EVALUATION BOARD (L x W x H) 2.1” x 1.4” x 0.5” (5.3cm x 3.5cm x 1.1cm) Board Number EV0020 MPS IC Number MP1591DN 1 EV0020 (MP1591DN) Rev. 1.5 www.MonolithicPower.com 12/21/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. EV0020 (MP1591DN) – 2A, 32V, 330KHz STEP-DOWN CONVERTER EVALUATION BOARD EVALUATION BOARD SCHEMATIC VIN GND JP1 OFF VIN U1 EN BS EN REF MP1591 REF SW C1 10nF D1 B340A-13 VOUT COMP FB C6 NS C3 1.8nF C4 NS GND GND EV0020_S01 EV0020 BILL OF MATERIALS Qty 1 1 1 2 1 1 1 1 1 1 Ref C1 C2 C3 C4, C6 C5 D1 R1 R2 R3 L1 L1 Alternate U1 47kΩ 8.2kΩ 15kΩ 22µH 22µH Value 10nF 10µF 1.8nF NS 22µF Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 35V Ceramic Capacitor, 50V, X7R Not Stuffed Ceramic Capacitor, 10V, 1210 Schottky Diode, 40V, 3A, SMA Film Resistor, 1% Film Resistor, 5% Film Resistor, 1% Inductor, 2.6A Inductor, 2.5A, Type D104C Step-Down Converter SO8 Package Manufacturer 0805 1210 0805 1210 AVX Taiyo Yuden AVX Taiyo Yuden Diodes Inc 0805 0805 0805 Yageo Panasonic Yageo Sumida Toko MPS Manufacturer P/N 08055C103KAT2A GMK325F106MH 08055C182KAT2A LMK325BJ226MM B340A-13 9C08052A4702FKHFT ERJ-6GEYJ822V 9C08052A1502FKHFT CDRH8D43-220 919AS-220M MP1591DN 1 EV0020 (MP1591DN) Rev. 1.5 www.MonolithicPower.com 12/21/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 2 EV0020 (MP1591DN) – 2A, 32V, 330KHz STEP-DOWN CONVERTER EVALUATION BOARD PRINTED CIRCUIT BOARD LAYOUT Figure 1—Top Silk Layer Figure 2—Top Layer Figure 3—Bottom Layer EV0020 (MP1591DN) Rev. 1.5 www.MonolithicPower.com 12/21/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 3 EV0020 (MP1591DN) – 2A, 32V, 330KHz STEP-DOWN CONVERTER EVALUATION BOARD QUICK START GUIDE The output voltage of this board is set to 5V. The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the load to VOUT and GND, respectively. 2. Attach the input voltage (6.5V ≤ VIN ≤ 32V) and input ground to VIN and GND, respectively. 3. To enable to the MP1591, apply a voltage (VEN ≥ 2V) to the EN pin. To disable it, connect the EN pin to ground. 4. The REF pin outputs a 5V reference voltage. If used, a 0.01µF capacitor should be connected from this pin to GND to reduce switching ripple. Leave unconnected if not used. 5. The output voltage VOUT can be changed by varying R1. Calculate R1 using the formula: ⎛V ⎞ R1 = R3 × ⎜ OUT − 1⎟ where VFB = 1.23V and R3 is set at 15kΩ. ⎜V ⎟ ⎝ FB ⎠ For example, for VOUT = 5.0V: ⎛V ⎞ ⎛ 5 .0 V ⎞ R1 = R3 × ⎜ OUT − 1⎟ = 15kΩ × ⎜ − 1⎟ = 45.98kΩ ≈ 47kΩ standard 1% value. ⎜V ⎟ ⎝ 1.23 V ⎠ ⎝ FB ⎠ See Maximum Duty Cycle limits to determine allowable output voltage range. 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. EV0020 (MP1591DN) Rev. 1.5 www.MonolithicPower.com 12/21/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. 4