MP2482DN-LF-Z

MP2482 5A, 30V, 420kHz Step-Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP2482 is a monolithic step-down switch mode converter with a built in internal power MOSFET. It achieves 5A continuous output current over a wide input supply range with excellent load and line regulation. • • • • • • • Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. The MP2482 requires a minimum number of readily available standard external components and is available in 8-pin SOIC package with and without exposed pad. • • • • Wide 4.5V to 30V Operating Input Range 5A Output Current 50mΩ Internal Power MOSFET Switch Power Good Indicator Fixed 420kHz Frequency Synchronizable up to 1.5MHz Cycle-by-Cycle Over Current Protection with hiccup Thermal Shutdown Output Adjustable from 0.81V Stable with Low ESR Output Ceramic Capacitors Available in 8-Pin SOIC Package and Thermally Enhanced 8-Pin SOIC Package APPLICATIONS • • • • Digital Set Top Boxes Personal Video Recorders Broadband Communications Flat Panel Television and Monitors “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VIN 8 IN BST Efficiency vs Output Current 2 VOUT=3.3V 100 MP2482 6 OFF ON VCC 7 VIN=5V 95 VCC SW 1 VOUT 3.3V @ 5A D1 B530C PG EN/SYNC FB GND 4 5 EFFICIENCY (%) 3 VIN=12V 90 85 VIN=30V 80 75 70 1 2 3 4 OUTPUT CURRENT (A) MP2482 Rev.1.4 www.MonolithicPower.com 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. 5 1 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature(TA) MP2482DN* MP2482DS** SOIC8E SOIC8 MP2482DN MP2482DS -40°C to +85°C * For Tape & Reel, add suffix –Z (eg. MP2482DN–Z). For RoHS Compliant Packaging, add suffix –LF (eg. MP2482DN–LF–Z) ** For Tape & Reel, add suffix –Z (eg. MP2482DS–Z). For RoHS Compliant Packaging, add suffix –LF (eg. MP2482DS–LF–Z) PACKAGE REFERENCE TOP VIEW TOP VIEW SW 1 8 IN BST 2 7 VCC 3 GND 4 SW 1 8 IN EN/SYNC BST 2 7 EN/SYNC 6 PG VCC 3 6 PG 5 FB GND 4 5 FB EXPOSED PAD ON BACKSIDE SOIC8 SOIC8E ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage VIN ....................................... 32V VSW .........................-0.3V(-5V for < 10ns) to 33V VBS ....................................................... VSW + 6V All Other Pins ..................................-0.3V to +6V (2) Continuous Power Dissipation (TA = +25°C) SOIC8E...................................................... 2.5W SOIC8 ........................................................ 1.4W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature............... -65°C to +150°C Recommended Operating Conditions (3) Supply Voltage VIN ...........................4.5V to 30V Operating Junct. Temp (TJ)...... -40°C to +125°C Thermal Resistance (4) θJA θJC SOIC8E ...................................50 ...... 10 ... °C/W SOIC8…………………………..90……45…°C/W 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. MP2482 Rev.1.4 www.MonolithicPower.com 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. 2 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS VIN = 12V, TA = +25°C, unless otherwise noted. Parameters Feedback Voltage Feedback Current Switch On Resistance (5) Switch Leakage Current Limit (5) Oscillator Frequency Fold-back Frequency Maximum Duty Cycle Minimum On Time Under Voltage Lockout Threshold Rising Under Voltage Lockout Threshold Hysteresis EN Input Low Voltage EN Input High Voltage Symbol Condition VFB 4.5V ≤ VIN ≤ 30V IFB VFB = 0.8V RDS(ON) VEN = 0V, VSW = 0V fSW 310 25 85 tON 3.9 Typ 0.808 10 50 0 7.5 420 115 90 100 4.1 880 Max 0.828 10 9 530 205 4.3 0.4 1.5 VEN = 2V VEN = 0V EN Input Current Sync Frequency Range (Low) Sync Frequency Range (High) Enable Turnoff Delay Supply Current (Shutdown) Supply Current (Quiescent) Thermal Shutdown Power Good Control Power Good Threshold Rising Power Good Threshold Hysteresis PG Pin Level VFB = 0.6V VFB = 0V VFB = 0.6V Min 0.788 2 0 300 1.5 5.0 0 0.9 150 FSYNCL FSYNCH TOFF VEN = 0V VEN = 2V, VFB = 1V 0.69 VPG PG Sink 4mA 0.74 40 Units V nA mΩ μA A kHz kHz % ns V mV V V μA 1.1 0.79 0.4 kHz MHz μs μA mA °C V mV V Note: 5) Guaranteed by design. MP2482 Rev.1.4 www.MonolithicPower.com 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. 3 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER PIN FUNCTIONS Pin # Name 1 SW 2 3 4 5 6 7 8 Description Switch Output. Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply BST voltage. It is connected between SW and BS pins to form a floating supply across the power switch driver. VCC Bias Supply. Decouple this pin with a 1µF ceramic capacitor. Ground. This pin is the voltage reference for the regulated output voltage. For this reason GND care must be taken in its layout. This node should be placed outside of the D1 to C1 ground path to prevent switching current spikes from inducing voltage noise into the part. Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. To prevent current limit run away during a short circuit fault condition the FB frequency foldback comparator lowers the oscillator frequency when the FB voltage is below 250mV. Power Good Indicator. Connect this pin to VCC or VOUT by a 100kΩ pull-up resistor. The PG output of this pin is low if the output voltage is 10% less than the nominal voltage, otherwise it is an open drain. EN/SYNC On/Off Control Input and Synchronization Pin. Supply Voltage. The MP2482 operates from a +4.5V to +30V unregulated input. C1 is IN needed to prevent large voltage spikes from appearing at the input. MP2482 Rev.1.4 www.MonolithicPower.com 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. 4 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12V, VOUT = 3.3V, IOUT = 5A, TA = +25ºC, unless otherwise noted. 100 0.35 1100 VIN=5V 95 EFFICIENCY (%) Disabled Supply Current vs Input Voltage Enabled Supply Current vs Input Voltage Efficiency vs Output Current VIN=12V 90 0.30 1050 0.25 1000 0.20 85 950 VIN=30V 80 75 850 70 800 1 0.15 900 2 3 4 OUTPUT CURRENT (A) 5 0.10 0.05 VFB=1V 0 VCC Regulator Line Regulation 10 20 30 INPUT VOLTAGE (V) 100 50 40 4.3 4.1 30 3.9 20 3.7 10 ICC=10mA 0 5 10 15 20 25 INPUT VOLTAGE (V) 0 30 0 NORMALIZED OUTPUT VOLTAGE NORMALIZED OUTPUT VOLTAGE 1.005 0.995 VIN=30V VIN=12V 0.990 0.985 0.980 0 1 2 3 4 OUTPUT CURRENT (A) VOUT65% VIN In these cases, an external BST diode is recommended from the output of the voltage regulator to BST pin, as shown in Fig.5 External BST Diode IN4148 BST MP2482 SW CBST L 5V or 3.3V COUT Figure 5—Add Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is IN4148, and the BST cap is 0.1~1µF. By using this circuit, 5V input voltage can output 3.3V and 2.5V with just 30mA load. MP2482 Rev.1.4 www.MonolithicPower.com 9/21/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. Preliminary Specifications Subject to Change © 2011 MPS. All Rights Reserved. 12 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER PACKAGE INFORMATION SOIC8E (EXPOSED PAD) 0.189(4.80) 0.197(5.00) 0.124(3.15) 0.136(3.45) 8 5 0.150(3.80) 0.157(4.00) PIN 1 ID 1 0.228(5.80) 0.244(6.20) 0.089(2.26) 0.101(2.56) 4 TOP VIEW BOTTOM VIEW SEE DETAIL "A" 0.051(1.30) 0.067(1.70) SEATING PLANE 0.000(0.00) 0.006(0.15) 0.013(0.33) 0.020(0.51) 0.0075(0.19) 0.0098(0.25) SIDE VIEW 0.050(1.27) BSC FRONT VIEW 0.010(0.25) x 45o 0.020(0.50) GAUGE PLANE 0.010(0.25) BSC 0.050(1.27) 0.024(0.61) 0o-8o 0.016(0.41) 0.050(1.27) 0.063(1.60) DETAIL "A" 0.103(2.62) 0.138(3.51) RECOMMENDED LAND PATTERN MP2482 Rev. 1.4 9/21/2011 0.213(5.40) NOTE: 1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN BRACKET IS IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.004" INCHES MAX. 5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION BA. 6) DRAWING IS NOT TO SCALE. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 13 MP2482 – 5A, 30V, 420kHZ STEP-DOWN CONVERTER SOIC8 0.189(4.80) 0.197(5.00) 8 0.050(1.27) 0.024(0.61) 5 0.063(1.60) 0.150(3.80) 0.157(4.00) PIN 1 ID 1 0.228(5.80) 0.244(6.20) 0.213(5.40) 4 TOP VIEW RECOMMENDED LAND PATTERN 0.053(1.35) 0.069(1.75) SEATING PLANE 0.004(0.10) 0.010(0.25) 0.013(0.33) 0.020(0.51) 0.0075(0.19) 0.0098(0.25) SEE DETAIL "A" 0.050(1.27) BSC SIDE VIEW FRONT VIEW 0.010(0.25) x 45o 0.020(0.50) GAUGE PLANE 0.010(0.25) BSC 0o-8o 0.016(0.41) 0.050(1.27) DETAIL "A" NOTE: 1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN BRACKET IS IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.004" INCHES MAX. 5) DRAWING CONFORMS TO JEDEC MS-012, VARIATION AA. 6) DRAWING IS NOT TO SCALE. 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. MP2482 Rev. 1.4 9/21/2011 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2011 MPS. All Rights Reserved. 14