The MP2481 is a 36V, 1.2A, white LED driver suitable for either step-down or inverting step-up/down applications. It achiev 1.2A peak output current over a wide input supply range with excellent load and line regulation. Current mode operation provid fast transient rponse and eas loop stabilization. Fault condition protection includ thermal shutdown, cycle-by-cycle peak current limiting, input over voltage protection, open strings protection and output short circuit protection. The MP2481 incorporat both DC and PWM dimming onto a single control pin. The separate
input reference ground pin allows for direct enable and/or dimming control for a positive to negative power conversion. The MP2481 requir a minimum number of readily available standard external components and is available in 8-pin MSOP8E package.
FEATUR
• 1.2A Maximum Output Current
• Unique Step-up/down Operation (Buck-Boost Mode)
• Wide 4.5V to 36V Operating Input Range for Step-Down Applications (Buck Mode)
• 0.30Ω Internal Power MOSFET Switch
• Fixed 1.4MHz Frequency
• Analog and PWM Dimming
• 0.2V Reference Voltage
• Up to 95% Efficiency
• 5μA Shutdown Mode
• No minimum LED required
• Stable with Low R Output Ceramic Capacitors
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown Protection
• Open Strings Protection
• Input Over Voltage Protection
• Output Short Circuit Protection
• Available in 8-Pin MSOP8E Package
APPLICATIONS
• General LED Illuminations
• LCD Backlight Panels
• Handheld Computers
• Automotive Internal Lighting
• Portable Multimedia Players
• Portable GPS Devic
