Converter Integrates Efficiency Features for Battery-Powered LED Driving

The SiP12510 and SiP2511 1.25MHz current-mode boost converters integrate a feedback reference voltage of 0.1V to enable reduced PCB size and increased power-conversion efficiency.

A logic-level shutdown pin can be used to reduce quiescent current to below 1µA, extending battery life.

The overall circuit efficiency of the SiP12510/11 converters makes them an ideal power solution for white LED, OLED, LCD and CCD applications operating from a single- or dual-cell lithium-ion battery.

Vishay’s converters accept an input-voltage range from 2.5V to 6V and deliver an output voltage of up to 27.5V for the SiP12511 and 17V for the SiP12510.

An integrated 33V power switch can carry up to 0.55A and features over-current limiting. An internal soft-start circuit controls the rate of rise of the output voltage during start-up to prevent overshoot. Thermal shutdown is also included and internal frequency compensation minimises the number of external components.

The SiP12510/11 boost converters are available in a 6-pin TSOT23-6 package and are specified to operate over the industrial temperature range of -40°C to 85°C.

 

FEATURES Current-mode control with internal frequency compensation 2.5V to 6V input-voltage range 1.25MHz switching frequency Under-voltage lockout protection Over-voltage protection Thermal-shutdown protection 0.55A switch-current limiting Built-in soft-start control

APPLICATIONS Boost regulators Charge-Coupled Device (CCD) bias supplies Digital cameras TFT and LCD displays DSL modems PCMCIA cards Backlights OLED drivers

 

 

Vishay / SiP12510/11