MP6922DS-LF

MP2497-A 3A, 50V, 100kHz Step-Down Converter with Programmable Output OVP Threshold The Future of Analog IC Technology DESCRIPTION FEATURES The MP2497-A is a monolithic step-down switch mode converter with a programmable output current limit. The MP2497-A is the high efficiency version of MP2497. It has fast switching speed thus the switching loss is greatly reduced. It achieves 3A continuous output current over a wide input supply range with excellent load and line regulation. An internal 2-4ms soft start prevents inrush current at turning on. And it is capable of providing output line drop compensation.            Fault condition protection includes hiccup current limit and short circuit protection, programmable output over voltage protection and thermal shutdown.  The MP2497-A requires a minimum number of readily available standard external components. The MP2497-A is available in SOIC8E package. Wide 4.5V to 50V Operating Input Range Programmable Output Over Voltage Protection Output Adjustable from 0.8V to 25V 0.15Ω Internal Power MOSFET Switch Internal 4ms Soft Start Stable with Low ESR Output Ceramic Capacitors Fixed 100kHz Frequency Fast Switching Speed Thermal Shutdown Output Line Drop Compensation Hiccup Circuit Limit and Short Circuit Protection Available in SOIC8E Package APPLICATIONS    USB Power Supplies Automotive Cigarette Lighter Adapters Power Supply for Linear Chargers 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 Efficiency vs. Output Current R6 L1 C3 C6 C2 BST C1 Diode C11 GND ISN C5 95 90 GND R3 R4 C7 10nF R7 C8 10nF R5 VIN=12V 80 75 ISP FB Rsense 85 OVP MP2497-A GND C10 VOUT + VIN VIN C4 SW C9 150pF R2 R1 70 VIN=24V VIN=50V 65 60 0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9 OUTPUT CURRENT(A) MP2497-A Rev. 1.0 www.MonolithicPower.com 5/30/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 1 MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER ORDERING INFORMATION Part Number MP2497GN-A* Package SOIC8E Top Marking MP2497-A * For Tape & Reel, add suffix –Z (e.g. MP2497GN-A–Z); PACKAGE REFERENCE SOIC8E ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Input Voltage VIN .......................................... 60V VISN, VISP .............................................. 0V to 25V |VISN -VISP| ........................................... 0V to 0.4V VSW ........................................ -0.3V to VIN + 0.3V VBST ................................................... VSW + 6.5V All Other Pins ...............................-0.3V to +6.5V Junction Temperature ...............................150C Lead Temperature ....................................260C Storage Temperature ............... -65C to +150C (2) Continuous Power Dissipation (TA = +25°C) SOIC8E ...................................................... 2.5W SOIC8E .................................. 50 ...... 10... C/W Recommended Operating Conditions (3) (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. Input Voltage VIN .............................. 4.5V to 50V Output Voltage VOUT (VIN>26.5V) ..... 0.8V to 25V Output Voltage VOUT (VIN65%) and high output voltage (VOUT>12V) applications. Design Example Below is a design example following the application guidelines for the specifications: VIN VOUT VOVP FSW IOUT-L 8 to 50V 5V 6V 100kHz 3A The detailed application schematic is shown in Figure 7. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more possible applications of this device, please refer to related Evaluation Board Data Sheets. Figure 6—External Bootstrap Diode MP2497-A Rev. 1.0 www.MonolithicPower.com 5/30/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 12 MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER Figure 7—Detailed Application Schematic MP2497-A Rev. 1.0 www.MonolithicPower.com 5/30/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 13 MP2497-A – 3A, 50V, 100kHz STEP-DOWN CONVERTER PACKAGE INFORMATION SOIC8E (EXPOSED PAD) 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. MP2497-A Rev. 1.0 www.MonolithicPower.com 5/30/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. 14