SKY81279

1.5A Single Flash LED Driver IC in a TDFN Package

Please note: this product is being discontinued and is not recommended for new designs.

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.

Data Sheets

Talk to Sales ECAD Model

Specifications

Flash I_OUT Total (mA)1500

Movie Mode I_OUT Total (mA)143

LED Channels1

Min. V_IN (V)2.7

Max. V_IN (V)5.5

Max. V_OUT (V)5.5

InterfaceAS²Cwire™

Max. Shutdown Current (μA)1

Typ. I_Q (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

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