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| 型号： | SC4541SKTRT |
| 厂商： | Semtech |
| 文件页数： | 1/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BACKLIGHT SOT23-6 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1.6MHz ~ 2.4MHz |
| 电源电压： | 2.9 V ~ 22 V |
| 输出电压： | 25V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC4541SKDKR |
SC4541
POWER MANAGEMENT
Features
High Frequency LED Driver with
Integrated Schottky and Simple Interconnect
Description
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V IN Range — 2.9V to 22V
V OUT Range — Up to 25V
I OUT Range:
? Up to 100mA (Boost)
? Up to 200mA (Buck)
Drives Up to 7 Series WLEDs (Boost)
Drives Up to 5 Series WLEDs (Buck)
Integrated Schottky Rectifier
Single-Wire LED Connect
Current Mode Control
? Frequency — 2.0MHz
? No External Compensation
Direct PWM Dimming
? 100:1 Range at 500Hz
Open-LED Protection — 27V
Low Shutdown Current < 1 μ A
Package Options:
? Low Profile MLPD-UT, 6-pin 2x2 x0.6(mm)
? SOT23, 6-pin 2.9x2.8 x1.45(mm)
The SC4541 is a fully integrated, high voltage boost (step-
up) and buck (step-down) LED driver. The input voltage
range is 2.9V to 22V with output voltage up to 25V. The
device is capable of driving up to 7 white LEDs. The high
side sense enables a single-wire LED connection by taking
advantage of the available system ground. This reduces
connector cost and complexity.
The device includes a current mode PWM controller,
260mA power switch, and high performance Schottky
rectifier. The LED driver eliminates external compensation
components for minimum solution size.
The wide input voltage range and low standby current are
ideal for portable devices. The high input voltage allows
direct connection to multi-cell battery packs which
increases operating efficiency and extends battery life.
Output current is programmed with an external sense
resistor up to 100mA (Boost) or 200mA (Buck). The device
provides ±5% constant current accuracy across the entire
operating temperature range.
? Lead-free, Halogen-Free and WeEE/RoHS Compliant
Applications
? Keypad Illumination
? DSC and DSLR Display Backlight
A logic level PWM dimming signal may be applied directly
to the enable (EN) pin - for direct PWM dimming with a
wide dimming range. Output OVP (over voltage protec-
tion) protects the SC4541 from open circuit faults in the LED
string or connector. External OVP programming resistors
are not required.
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Cellular Handsets
Automotive Lighting
The SC4541 is available in low profile MLPD-UT and
SOT23,6-pin packages. The device is rated across the
temperature range -40°C to +85°C.
Typical Application Circuit
Boost Topology I OUT up to 100mA
V IN 2.9V to 22V
L1
OUT
RS
C1
1 μ F
10 μ F
IN
SW
SC4541
V OUT Up to 25V
C2
1 μ F 10 Ω
PWM
Dimming
EN
GND
FB
7 WLED @
20mA
Version 1.3
? 2011 Semtech Corporation
1
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