MP2481 36V, 1.2A, 1.4MHz White LED Driver The Future of Analog IC Technology DESCRIPTION FEATURES The MP2481 is a 36V, 1.2A, white LED driver 1.2A Maximum Output Current suitable for either step-down or inverting Unique Step-up/down Operation (Buck- step-up/down applications. It achieves 1.2A Boost Mode) peak output current over a wide input supply Wide 4.5V to 36V Operating Input Range for range with excellent load and line regulation. Step-Down Applications (Buck Mode) Current mode operation provides fast transient 0.30 Internal Power MOSFET Switch response and eases loop stabilization. Fault Fixed 1.4MHz Frequency condition protection includes thermal shutdown, Analog and PWM Dimming cycle-by-cycle peak current limiting, input over 0.2V Reference Voltage voltage protection, open strings protection and Up to 95% Efficiency output short circuit protection. 5 A Shutdown Mode The MP2481 incorporates both DC and PWM No minimum LED required dimming onto a single control pin. The separate Stable with Low ESR Output Ceramic input reference ground pin allows for direct Capacitors enable and/or dimming control for a positive to Cycle-by-Cycle Over Current Protection negative power conversion. Thermal Shutdown Protection The MP2481 requires a minimum number of Open Strings Protection readily available standard external components Input Over Voltage Protection and is available in 8-pin MSOP8E package. Output Short Circuit Protection EVALUATION BOARD REFERENCE Available in 8-Pin MSOP8E Package Board Number Mode APPLICATIONS General LED Illuminations EV2481-H-00A Step-down LCD Backlight Panels EV2481-H-01A Step-up/down Handheld Computers Automotive Internal Lighting Portable Multimedia Players Portable GPS Devices All MPS parts are lead-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 Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION (STEP-UP/DOWN APPLICATION) Efficiency vs. Input Voltage Step-up/down Application 3 OVP 7 90 1 BST VIN VDD Cbs L1 85 C1 SW 6 4 series,400mA 80 D1 C2 3 series,400mA R1 MP2481 75 3 series,9 paralleded,180mA total EN/DIM 5 EN/DIM 70 4 65 6 GND INGND VSS FB R2 60 2 RS 0 5 10 15 20 25 30 INPUT VOLTAGE (V) MP2481 Rev. 1.5 www.MonolithicPower.com 1 8/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. EFFICIENCY (%)MP2481 36V, 1.2A, 1.4MHz WHITE LED DRIVER ORDERING INFORMATION Part Number* Package Top Marking MSOP8E MP2481DH 2481D * For Tape & Reel, add suffix Z (e.g. MP2481DHZ). For RoHS compliant packaging, add suffix LF (e.g. MP2481DHLFZ) PACKAGE REFERENCE TOP VIEW VDD 1 8 SW VSS 2 7 BST OVP 3 6 INGND FB 4 5 EN/DIM EXPOSED PAD ON BACK SIDE* * Do not Connect to Input Ground (INGND) for Boost, Buck-Boost applications (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage V V ............................. 40V DD SS MSOP8E (Exposed Pad) ........ 55 ...... 12 ... C/W V V .............................. 0.3V to V + 0.3V SW SS IN Notes: V ........................................................ V + 6V BST SW 1) Exceeding these ratings may damage the device. V V ....................................... 0.3V to +6V OVP SS 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-to- V V .................................... 0.3V to +6V EN INGND ambient thermal resistance JA, and the ambient temperature V V ................................... 0.3V to +6V DIM INGND TA. The maximum allowable continuous power dissipation at V V .................................... 0.3V to 40V INGND SS any ambient temperature is calculated by PD (MAX) = (TJ (2) (MAX)-TA)/ JA. Exceeding the maximum allowable power Continuous Power Dissipation (T = +25C) A dissipation will cause excessive die temperature, and the ....2.3W regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent Junction Temperature ............................... 150 C damage. Lead Temperature .................................... 260 C 3) The device is not guaranteed to function outside of its operating conditions. Storage Temperature ............... 65C to +150 C 4) Measured on JESD51-7, 4-layer PCB. (3) Recommended Operating Conditions Supply Voltage V V ................ 4.5V to 36V DD SS Operating Junct. Temp (T ) ..... 40C to +125 C J MP2481 Rev. 1.5 www.MonolithicPower.com 2 8/24/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved.