Datasheet > SKY81298-24

SKY81298-24

更新时间： 2024-11-26 00:54:59

品牌	Logo	应用领域
思佳讯 - SKYWORKS		/
页数	文件大小	规格书
3页	259K
描述
2.4 A Three-Channel Flash LED Driver with Control Interface

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SKY81298-24 数据手册

PRODUCT SUMMARY

SKY81298: 2.4 A Three-Channel Flash LED Driver

with I²C Control Interface

Applications

Description

The SKY81298 is a high-efficiency, high-current boost converter

with three independently programmable constant current outputs.

The device is optimized for LED flash applications implementing

tri-tone flash LED color compensation, or dual rear LED flash plus

single front LED flash to support “selfie” pictures taken from the

front-facing camera. The SKY81298 uses a single DC/DC boost

and only one inductor to support all three LED outputs, and all

LED outputs may be enabled simultaneously to support up to a

total of 2.4 A total LED current.

 LED photo flash with Movie/Torch mode

 Tri/dual tone LED for color compensation

 “Selfie” flash for front-facing camera (PIP enabled)

 Smartphones/tablets

Features

 Input voltage range: 2.5 V to 5.5 V

The SKY81298 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.

 Each channel can program up to 1.5 A with 12 mA 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

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 SKY81298 ideally suited for small battery-

powered 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

SKY81298 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 Movie-

mode levels or to shut off the flash current during high battery

demand conditions. The flash enable inputs can be configured to

control different flash LEDs as required by the system designer.

 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

The SKY81298 is available in a small 1.903  1.903  0.605 mm,

16-bump Wafer-Level Chip Scale (WLCSP) package.

 Temperature range: −40 C to +85 C

 Small WLCSP (16-bump, 1.903  1.903  0.605 mm, 0.4 mm

pitch) package (MSL1, 260 C per JEDEC J-STD-020)

The typical application circuits are shown in Figures 1a and 1b.

Skyworks Green^TMproducts are compliant with

all applicable legislation and are halogen-free.

For additional information, refer to Skyworks

Deﬁnition of Green^TM, document number

SQ04–0074.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

203693A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 31, 2015

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与SKY81298-24相关器件

型号	品牌	获取价格	描述	数据表
SKY81299	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-11	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-12	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-13	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-14	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-21	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-22	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-23	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY81299-24	SKYWORKS	获取价格	2.4 A Two-Channel Flash LED Driver with Control Interface
SKY85314-11	SKYWORKS	获取价格	Wireless LAN Circuit,

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