Monolithic Power Systems MP2481

Description

The MP2481 is a 36V, 1.2A, white LED driver suitable for either step-down or inverting step-up/down applications. It achieves 1.2A peak 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 thermal shutdown,cycle-by-cycle peak current limiting, input over voltage protection, open strings protection and output short circuit protection.The MP2481 incorporates 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 requires a minimum number of readily available standard external components and is available in 8-pin MSOP8E package.

Features

• 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 ESR 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

Typical applications

• Handheld Computers
• Portable GPS Devices
• General LED Illuminations
• Portable Multimedia Players
• LCD Backlight Panels
• Automotive Internal Lighting

More information

• Datasheet
• IC product information