The CXLE8148 variable frequency step-up Converter drives white LEDs with a constant
current to provide backlight in cell phones, PDAs, and other hand-held devices. It
features allowing series connection of the white LEDs so that the LED currents are
identical for uniform brightness. An enable input can be pulsed repeatedly to adjust
LEDs brightness. The fast 3MHz operation frequency allows for smaller capacitor and
inductor. Fault condition protection uses cycle-by cycle current limiting to sense
maximum inductor current and over-voltage protection. The 0.2V low reference voltage
minimized the power loss across the current sense resistor. The converter can operate
from 2V to 6V, and capable of delivering maximum 250mA output current at 4-LEDs
application with 3V input voltage. Quiescent current drawn from power source is as low
as 120uA
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[ CXLE8148 ]"
目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（PDF文档）
一.产品概述
The CXLE8148 variable frequency step-up Converter drives white LEDs with a constant
current to provide backlight in cell phones, PDAs, and other hand-held devices. It
features allowing series connection of the white LEDs so that the LED currents are
identical for uniform brightness. An enable input can be pulsed repeatedly to adjust
LEDs brightness. The fast 3MHz operation frequency allows for smaller capacitor and
inductor. Fault condition protection uses cycle-by cycle current limiting to sense
maximum inductor current and over-voltage protection. The 0.2V low reference voltage
minimized the power loss across the current sense resistor. The converter can operate
from 2V to 6V, and capable of delivering maximum 250mA output current at 4-LEDs
application with 3V input voltage. Quiescent current drawn from power source is as low
as 120uA. All of these features make CXLE8148 be suitable for the portable devices,
which are supplied by a single battery. CXLE8148 is available in SOT23-6 package that is
PB free.
二.产品特点
Up to 19V Output Voltage
Wide Operation Range: 2V to 6V
Maximum 3MHz Operating Frequency
PWM Dimming Control
Shutdown Current<1uA
Current Limit Cycle-by-Cycle
Low Current Sense Threshold: 200mV
19V Over Output Voltage Protection
Compact SOT23-6 Package
三.应用范围
Compact Back Light Module
Power Source for LED
Constant Current Source
四.技术规格书（产品PDF)
需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！
五.产品封装图
六.电路原理图
七.相关芯片选择指南
| 升压型LED背光/照明驱动电路(Step-up White LED Driver ) | |||||||||
| Applications: Step-up converter to drive white-LED, constant current output, LED backlight | |||||||||
| Part No. | Mode | VIN | VOUT | IQ | FOSC | Eff. | FB Voltage | Package | Application |
| CXLE8147 | PFM | 0.8~9V | 36uA | 300kHz | 82% | 200mV | SOT89-5 | Step-up Converter To Drive One Or Two 1W White LEDs | |
| CXLE8148 | PFM | 2~6V | 19V Max | 93μA | 3MHz | 80% | 200mV | SOT23-6 | STBA,PHONE,PDA,GPS |
| CXLE8149 | PWM | 2.5~5.5V | 28V Max | 150μA | 1.2MHz | 90% | 250mV | SOT23-6 | |
| CXLE8150 | PWM | 2.5~5.5V | 30V Max | 150μA | 1.2MHz | 96% | 1.23V | SOT23-5 | |
