SKY81290

1.2 A Single Flash LED Driver With AS<sup>2</sup>C Interface

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

The SKY81290 is a high efficiency, 1.2 A 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 SKY81290 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 2.0 MHz. The high switching frequency allows the use of a small external inductor and output capacitor, which makes the SKY81290 ideally suited for small battery-powered applications.

Skyworks proprietary Advanced Simple Serial Control (AS²Cwire™) digital interface is used to enable, disable, configure, and program the operation of the SKY81290. Using the AS²Cwire interface, the Movie Mode current level for each LED, flash safety timer, and the flash-to-Movie-Mode current ratio can be programmed to one of 16 levels.

The SKY81290 includes a separate flash enable input (FLEN) to initiate the flash operation. Also included is a flash inhibit pin (FLINH) that reduces the flash current to Movie Mode levels during high battery demand. The maximum Flash and Movie Mode current is set by one external resistor where the ratio of Flash to Movie Mode current is set at approximately 7:1.

The SKY81290 contains a thermal management system to protect the device in the event of an output short-circuit condition. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0 μA.

The SKY81290 is available in a 14-pin, 3 x 3 mm TDFN package and a 14-pin, 3 x 2 mm 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%

PackageTDFN, 14L

Package (mm)3 x 3 x 0.75 / 3 x 2 x 0.75

PackageTDFN-14L

Features

Input voltage range: 2.7 V to 5.5 V
Single channel flash output
Up to 1.2 A regulated output current
Up to 88% efficiency
Switching frequency: 2.0 MHz
Separate flash enable
Single resistor sets Flash and Movie Mode current
Flash safety timer
AS²Cwire single wire programming:
- Movie Mode current
- Flash/Movie Mode current ratio
- Maximum flash current ratio
True Load Disconnect
Soft start and input current limit
Over voltage (open LED, open circuit), short circuit, and over-temperature protection
TDFN (14-pin, 3 x 3 mm and 3 x 2 mm) packages (MSL1, 260 °C per JEDEC J-STD-020)

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