DESCRIPTION

· The SKY81290 is a high-efficiency, 1.2 A high current boost converter with a programmable constant current sink, ideal for LED photo flash applications in single cell, Li-ion powered products.

· It maintains output current regulation by switching internal high-side and low-side switch transistors at a fixed frequency of 2.0 MHz.

· The high switching frequency allows the use of small external components, making it suitable for small battery-powered applications.

· It features Skyworks' proprietary AS2Cwire™ digital interface for enabling, disabling, configuring, and programming the device.

· The SKY81290 includes a thermal management system, built-in circuitry to prevent excessive inrush current, and a shutdown feature reducing quiescent current to less than 1.0 μA.

· It is available in 14-pin, 3 x 3 mm and 3 x 2 mm TDFN packages.

FEATURES

· Input voltage range: 2.7 V to 5.5 V.

· Single channel flash output with up to 1.2 A regulated output current and up to 88% efficiency.

· Switching frequency: 2.0 MHz.

· Separate flash enable and flash safety timer.

· Single resistor sets Flash and Movie Mode current.

· AS2Cwire single wire programming for Movie Mode current, Flash/Movie Mode current ratio, and maximum flash current ratio.

· True Load Disconnect, soft start, and input current limit.

· Over voltage, short circuit, and over-temperature protection.

· TDFN (14-pin, 3 x 3 mm and 3 x 2 mm) packages compliant with MSL1, 260°C per JEDEC J-STD-020.

· Skyworks Green™ products are halogen-free and compliant with all applicable legislation.

APPLICATIONS

· LED photo flash/torch devices.

· Camera-enabled mobile devices.

· Cellphones/smartphones.

· Multimedia mobile phones.