Inductorless high current LED charge pump is 90% efficient
18 May 2005
Power Electronics / Power Management
Linear Technology's LTC3215, a fractional charge pump, high current white LED driver IC in a 3 x 3 mm 10-lead DFN package, can deliver up to 700 mA of LED current. Its high efficiency multimode architecture automatically switches between 1x, 1,5x or 2x boost modes by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. This enables the LTC3215 to maximise efficiency (up to 92%) throughout the entire Li-Ion operating range.
A 900 kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a very tiny footprint and cost-effective solution, says the manufacturer, and this is ideally suited for video and flash applications in camera phones and other portable lighting applications.
The IC employs built-in soft-start circuitry which prevents excessive start-up inrush current. An ultralow dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage.
For more information contact Memec SA, +27 (0)21 4103.
Further reading:
STMicroelectronics’ new chip boosts energy efficiency
Future Electronics
Power Electronics / Power Management
The new power-supply controller chip combines with ST’s MasterGaN technology in a laptop/smartphone charger design with energy recovery.
Read more...
Powering your automotive electronics
Altron Arrow
Power Electronics / Power Management
A look at the challenges of providing multiple supply rails to vehicle systems being powered from a single vehicle battery, with an available solution given.
Read more...
Infineon releases new high-efficiency buck regulator module
EBV Electrolink
Power Electronics / Power Management
This new buck regulator module has a 3 A single output with integrated inductor and offers high-efficiency load regulation in a compact package.
Read more...
Thinner pattern coils set to revolutionise wireless charging
Electrocomp
Power Electronics / Power Management
TDK developed the 0,76 mm thick charging coils using a unique pattern coil technology without employing conventional lithographic exposure and etching techniques.
Read more...
Adjustable 1200 W power supply with near-to-zero output
Vepac Electronics
Power Electronics / Power Management
Powerbox releases a 1200 W power supply, optimised for conduction cooling, which has adjustable near-to-zero output voltage and current.
Read more...
10-channel, half-bridge motor driver with serial input control
NuVision Electronics
Power Electronics / Power Management
The ten half-bridges can be controlled separately via a standard serial data interface, and each half-bridge has various diagnostic functions.
Read more...
PowerDI8080 40 V MOSFET delivers industry-leading performance
Altron Arrow
Power Electronics / Power Management
Diodes Incorporated has announced the introduction of the PowerDI80808-5, a power package that meets the needs of EV applications.
Read more...
Solar-powered paver to harness clean energy
Power Electronics / Power Management
The PLATIO is a solar paver tile combined with a double green building material that not only generates clean energy but is also made from recycled plastic.
Read more...
Three compact solutions for high step-down voltage ratios
Altron Arrow
Editor's Choice Power Electronics / Power Management
System designers can be faced with the challenge of down-converting high DC input voltages to very low output voltages at high output current.
Read more...
Digital power controller for LED lighting
EBV Electrolink
Power Electronics / Power Management
STMicroelectronics’ new single-chip digital power controller simplifies design and increases flexibility in LED lighting applications.
Read more...
printer friendly version