SKY81292-11-001

1.8 A Single or Dual Flash LED Driver

Please note: SKY81292-11-001 is being discontinued and is not recommended for new designs.

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

The SKY81292 is a high-efficiency, 1.8 A high-current boost converter with a programmable constant current. The device is intended for LED photo flash applications in all single-cell Li-ion powered portable products.

The SKY81292 maintains the flash LED output current using a DCDC step-up converter with a bypass function to maximize efficiency when under all load conditions. For single flash LED applications, the flash current can be programmed up to 1.8 A. For dual flash LED applications, the flash current can be programmed up to 900 mA. This provides a direct flash LED cathode connection to the ground plane that helps heat dissipation.

The high frequency 2 MHz DC-DC boost switching frequency allows the use of a small external inductor and output capacitor, which makes the SKY81292 ideally suited for small batterypowered applications. A start-up 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 SKY81292 LED flash and movie modes. Device operations are fully configurable; movie and flash current level, current limits, and fault reporting. Also included is a separate flash enable input to initiate the flash operation and a flash inhibit input to reduce the flash current to movie-mode levels during high battery demand conditions. An additional low-level programmable current source output is provided to drive an LED indicator lamp.

The integrated thermal management system protects the device in the event of an output short-circuit condition. An NTC thermistor function protects the external flash LEDs from thermal damage. Fault status may be read using the I²C interface after the system is alerted by an open drain fault flag. Built-in soft-start circuitry prevents excessive in-rush current during start-up. The shutdown feature reduces quiescent current to less than 1.0 μA.

The SKY81292 is provided in a small, 16-bump, 2 mm x 2 mm Wafer Level Chip Scale Package (WLCSP).

Product Summary

Talk to Sales ECAD Model

Specifications

Product LifecycleObsolete

Flash I_OUT Total (mA)1800

Movie Mode I_OUT Total (mA)200

LED Channels1

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)75

Peak Efficiency90%

PackageWLCSP, 16-bump

Package (mm)2 x 2 x 0.445

PackageWLCSP

Features

Input voltage range: 2.5 V to 5.5 V
Supports single and dual flash LEDs
Up to 1.8 A regulated output current
Up to 90% efficiency
Switching frequency: 2 MHz
True load disconnect
Soft-start and input current limit
Separate flash enable
Industry standard I2C programming:
- Flash and Movie mode current
- Battery current limit
- Input voltage monitor with programmable thresholds
- Programmable safety timer
- Fault readback
Fault protection:
- Flash timer
- Over-voltage (open LED, open circuit)
- Short circuit
- Over-temperature protection
- NTC resistor flash LED temperature sense
- Flash mode input voltage monitor
- Open drain fault flag output
Independent current source for LED indicator lamp
Small WLCSP (16-bump, 2 mm x 2 mm) package (MSL1, 260 °C per JEDEC J-STD-020) package

Find Your Sales Representative and Distributor
Consult with your Skyworks sales representative or distributor to find the best solution for your design.

Request a Quote
Get a quote for the specific products and quantities you need.

Working with Skyworks
Learn more about our purchase process to navigate quickly and efficiently

Support and Resources
Explore Skyworks support options, consult with our global sales and channel partners, and get the resources and expert guidance and custom development services you need to help you with your next innovation.

Technical Documents
Explore application notes, block diagrams, data sheets, user guides, ADS model calculators, installation references, S parameters and more.

Product Lifecycle Status Lookup
Lookup the product lifecycle status of Skyworks part number

Certificate of Conformance
Look up a product’s Certificate of Conformance for information such as REACH, RoHS, IEC 624741 and more.

Engineer examining electrical components

Previously Visited Products

New and Featured Products

Previously Visited Applications

New and Featured Applications