SKY81299

2.4 A Two-Channel Flash LED Driver

The SKY81299 is a high-efficiency, 2.4 A high-current boost converter with two independently programmable constant current outputs. The device is intended for LED photo flash/facial recognition and “selfie” front-facing camera flash applications in all single-cell Li-ion powered portable products. The SKY81299 maintains the flash LED output current using a DC-DC step-up converter with a bypass function to maximize efficiency under all load conditions. The flash current for each channel can be programmed up to 1.5 A at 12 mA step. The device uses a common cathode (current source) topology to allow a direct flash LED cathode connection to the ground plane which facilitates LED heat dissipation. The total combined output current for flash outputs is 2.4 A.

The high-frequency 2.75 MHz DC-DC boost switching frequency allows the use of a small external inductor and output capacitor, which makes the SKY81299 ideally suited for small batterypowered applications. A startup control circuit automatically senses the flash LED forward voltage at any programmed output current setting and determines the most efficient operation mode.

An industry standard I²C digital interface is used to program the SKY81299 LED Flash and Movie modes. Device operations are fully configurable; Movie and Flash current level, current limits, and fault reporting are managed through I2C. Also included are separate flash enable inputs to initiate the flash operation and a flash inhibit input either to reduce the flash current to Moviemode levels or to shut off the flash current during high battery demand conditions.

The SKY81299 is available in a small 1.903 x 1.903 x 0.605 mm, 16-bump Wafer-Level Chip Scale (WLCSP) package.

Product Summary

Talk to Sales ECAD Model

Specifications

Flash I_OUT Total (mA)2400

Movie Mode I_OUT Total (mA)250

LED Channels2

Min. V_IN (V)2.5

Max. V_IN (V)5.5

Max. V_OUT (V)5.5

InterfaceI²C

Max. Shutdown Current (μA)1

Typ. I_Q (μA)1

Peak Efficiency93%

PackageWLCSP, 16-bump

Package (mm)1.9 x 1.9 x 0.605

PackageWLCSP-16

Features

Input voltage range: 2.5 V to 5.5 V
Each channel can program to 1.5 A with 12 mA programming
step size; up to 2.4 A total combined output current
>90% LED efficiency at 250 mA
(3.3 V < VIN < 3.6 V, VF = 3.3 V);
> 85% LED efficiency at 1 A
(3.4 V< VIN < 3.9 V, VF = 3.3 V)
2.75 MHz switching frequency
Soft-start and input current limit
Separate flash enable/flash inhibit
Programmable blinking LED notification
Industry standard 1 MHz I²C programming
- Flash and Movie mode current
- Input voltage monitor with programmable thresholds
- Current read-back in input voltage monitor operation
- Programmable safety timer
- Fault read back
Fault protection
- Integrated safety timer
- Over-voltage (open LED, open circuit)
- Short circuit
- Over-temperature protection
- Flash mode input voltage monitor
- Open-drain fault output
-40 C to +85 C temperature range
Small WLCSP (16-bump, 1.903 x 1.903 x 0.605 mm, 0.4 mm pitch) package (MSL1, 260 ºC per JEDEC J-STD-020)

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