Datasheet > SKY81299-12

SKY81299-12

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	166K
描述
2.4 A Two-Channel Flash LED Driver with Control Interface

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SKY81299-12 数据手册

PRODUCT SUMMARY

SKY81299: 2.4 A Two-Channel Flash LED Driver

with I²C Control Interface

Applications

Description

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.

 LED photo flash with Movie/Torch mode

 Dual LED flash with color compensation

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

 Smartphones/tablets

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.

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

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 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

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 Movie-

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

demand conditions.

(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

The SKY81299 is available in a small 1.903  1.903  0.605 mm,

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

 Integrated safety timer

 Over-voltage (open LED, open circuit)

 Short circuit

A typical application circuit is shown in Figure 1.

 Over-temperature protection

 Flash mode input voltage monitor

 Open-drain fault output

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.

 −40 C to +85 C temperature range

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

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

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

203795A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 8, 2015

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与SKY81299-12相关器件

型号	品牌	获取价格	描述	数据表
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,
SKY85320-11	SKYWORKS	获取价格	2.4 GHz, 802.11ac Front-End Module
SKY85320-11-EVB	SKYWORKS	获取价格	2.4 GHz, 802.11ac Front-End Module
SKY85325-11	SKYWORKS	获取价格	2.4 GHz, 256 QAM WLAN Front-End Module

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