SKY81279

1.5A Single Flash LED Driver IC in a TDFN Package

The SKY81279 is a high-efficiency, 1.5A high-current boost converter with a programmable constant current sink. It is an ideal power solution for LED photo flash applications in all single-cell Li-ion powered products.

The SKY81279 maintains output current regulation by switching the internal high-side and low-side switch transistors. The transistor switches are pulse-width modulated at a fixed frequency of 2.0MHz. The high switching frequency allows the use of a small external inductor and output capacitor.

Skyworks' proprietary AS2Cwire™ (Advanced Simple Serial Control) serial digital interface is used to enable, disable, configure, and program the operation of the SKY81279. Using the AS2Cwire interface, the LED flash and movie-mode currents can be programmed to different levels. The SKY81279 includes a separate Flash Enable input to initiate the flash operation and a Flash Inhibit pin to quickly reduce the flash current to moviemode levels during high battery demand.

The SKY81279 contains a thermal management system to protect the device in the event of output short circuit. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0μA.

The SKY81279 is available in a a Pb-free, 14-pin 2mm x 3mm TDFN package.

Please note: SKY81279-11-563LF is being discontinued and is not recommended for new designs.

Data Sheets
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Specifications

Flash IOUT Total (mA)1500
Movie Mode IOUT Total (mA)143
LED Channels1
Min. VIN (V)2.7
Max. VIN (V)5.5
Max. VOUT (V)5.5
InterfaceAS2Cwire™
Max. Shutdown Current (μA)1
Typ. IQ (μA)230
Peak Efficiency88%
PackageTDFN23 14L
Package (mm)2 x 3 x 0.75
PackageTDFN23-14

Features

  • Input Voltage Range: 2.7V to 5.5V
  • Single Channel Flash Output
  • Up to 1.5A Regulated Output Current
  • Up to 88% Efficiency
  • 2.0 MHz Switching Frequency
  • Separate Flash Enable
  • Single Resistor Sets Flash and Movie Mode Current
  • AS2Cwire Single Wire Programming:
    • Flash Current Ratio
    • Movie Mode Current
    • Output Enable Control
  • True Load Disconnect
  • Soft-Start and Input Current Limit
  • Over-Voltage, Open and Shorted LED, Short-Circuit, and Over-Temperature Protection
  • -40°C to +85°C Temperature Range
  • 14-pin 2mm x 3mm TDFN package

Product Documents

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  • Green / Pb-Free Certificate
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