MP2492DN-LF

MP2492 2A, 55V, 100kHz Step-Down Converter with Programmable Output Current Limit The Future of Analog IC Technology DESCRIPTION FEATURES The MP2492 is a monolithic step-down switch mode converter with a programmable output current limit. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. The maximum output current can be programmed by sensing current through the inductor DC resistance (DCR) or an accurate sense resistor. MP2492 achieves low EMI signature with well controlled switching edges. Fault condition protection includes cycle-by-cycle current limiting, and thermal shutdown. The MP2492 requires a minimum number of readily available standard external components. The MP2492 is available in QFN10 (3mm x 3mm) and SOIC8E packages. • • • • • • • • • • • Wide 4.5V to 55V Operating Input Range Programmable up to 2A Output Current Output Adjustable from 0.8V to 15V Programmable Output Current Limit without power loss 0.25Ω Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Fixed 100kHz Frequency Low EMI signature Thermal Shutdown Cycle-by-Cycle Over Current Protection Available in QFN10 and SOIC8E Packages APPLICATIONS • • • USB Power Supplies Automotive Cigarette Lighter Adapters Power Supply for Linear Chargers “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency 100 VIN =12V , VOUT =5V EFFICIENCY ( % ) 90 80 70 60 50 40 30 20 0.0 0.4 0.8 1.2 1.6 2.0 I OUT (A) MP2492 Rev. 1.0 12/20/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 1 MP2492 – 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (TA) MP2492DN* SOIC8E MP2492DN –40°C to +85°C MP2492DQ** QFN10(3mmx3mm) 3Q –40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP2492DN–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP2492DN–LF–Z) ** For Tape & Reel, add suffix –Z (e.g. MP2492DQ–Z). For RoHS compliant packaging, add suffix –LF (e.g. MP2492DQ–LF–Z) PACKAGE REFERENCE VIN SW VIN SW GND BST GND BST FB ISP SS ISN EXPOSED PAD EN PGOOD FB ISP SS ISN ON BACKSIDE EXPOSED PAD CONNECT TO GND ON BACKSIDE CONNECT TO GND SOIC8E ABSOLUTE MAXIMUM RATINGS (1) Input Voltage VIN .......................................... 60V VSW ....................................... –0.3V to VIN + 0.3V VBST ................................................... VSW + 6.5V VISN, vISP ................................................ 0V to15V | VISN, - vISP | ........................................ 0 to 0.5V VEN, ....................................................... 0V to15V All Other Pins .............................. –0.3V to +6.5V (2) Continuous Power Dissipation (TA = +25°C) SOIC8E ...................................................... 2.5W QFN10 (3 x 3 mm) ..................................... 2.5W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature .............. –50°C to +150°C MP2492 Rev. 1.0 12/20/2010 QFN10(3mmx3mm) Recommended Operating Conditions (3) Input Voltage VIN .............................. 4.5V to 55V Output Voltage VOUT (VIN>16.5V) ...... 0.8V to 15V Output Voltage VOUT (VIN65%) and high VIN output voltage (VOUT>12V) applications. MP2492 Rev. 1.0 12/20/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 8 MP2492 – 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT Output Current Sensing The output current can be sensed through the DC resistance (DCR) of the inductor, as shown in Figure 3a. For more accurate sensing, use a more accurate sense resistor. × b R b Ra R 2 T U IO = V mR 0C 0D 1 In Figure 3a, the output current limit is set as: + Where DCR is the DC resistance of the inductor winding. = 1R LC D S × b R × + a R C b R a R In Figure 3a, it is desirable to keep For more accurate sensing, use a more accurate sense resistor. T U IO = V E S m N E 0 S 0 1R In Figure 3b, the output current limit is set as: Figure 3—Current Sensing Methods MP2492 Rev. 1.0 12/20/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 9 MP2492 – 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT PACKAGE INFORMATION SOIC8E (EXPOSED PAD) 0.189(4.80) 0.197(5.00) 8 0.124(3.15) 0.136(3.45) 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" 0.013(0.33) 0.020(0.51) 0.051(1.30) 0.067(1.70) SEATING PLANE 0.000(0.00) 0.006(0.15) 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 0.024(0.61) 0.050(1.27) 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 MP2492 Rev. 1.0 12/20/2010 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. © 2010 MPS. All Rights Reserved. 10 MP2492 – 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT QFN10 (3mm x 3mm) 2.90 3.10 0.30 0.50 PIN 1 ID MARKING 0.18 0.30 2.90 3.10 PIN 1 ID INDEX AREA 1.45 1.75 PIN 1 ID SEE DETAIL A 10 1 2.25 2.55 0.50 BSC 5 6 TOP VIEW BOTTOM VIEW PIN 1 ID OPTION A R0.20 TYP. PIN 1 ID OPTION B R0.20 TYP. 0.80 1.00 0.20 REF 0.00 0.05 SIDE VIEW DETAIL A NOTE: 2.90 0.70 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VEED-5. 5) DRAWING IS NOT TO SCALE. 1.70 0.25 2.50 0.50 RECOMMENDED LAND PATTERN 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. MP2492 Rev. 1.0 12/20/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 11