TPS60231 - 采用 3x3 QFN 封装、用于 LED 背光的 3 通道、稳定电流为 75mA 的充电泵

TPS60231是TI德州仪器公司的一款背光产品，TPS60231是采用 3x3 QFN 封装、用于 LED 背光的 3 通道、稳定电流为 75mA 的充电泵，本站介绍了TPS60231的封装应用图解、特点和优点、功能等，并给出了与TPS60231相关的TI元器件型号供参考。

TPS60231 - 采用 3x3 QFN 封装、用于 LED 背光的 3 通道、稳定电流为 75mA 的充电泵 - 背光 - LED驱动器 - 德州仪器

产品描述

The TPS60231 charge pump is optimized for white LED supplies in color display backlight applications. The device provides a constant current for each LED, which the initial value can be set by an external resistor. The supply voltage ranges from 2.7 V to 6.5 V and is ideally suited for all applications powered by a single LI-Ion battery cell or three to four NiCd, NiMH, or alkaline battery cells. Over an input voltage range from 3.1 V to 6.5 V, the device provides a high output current of up to 25 mA per LED with a total of 75 mA. High efficiency is achieved by utilizing a 1x/1.5x fractional conversion technique in combination with very low dropout current sources. In addition, the current controlled charge pump ensures low input current ripple and EMI. Only two external 1 µF and two 0.47 µF capacitors are required to build a complete small and low cost power supply solution. To reduce board space to a minimum, the device switches at 1 MHz operating frequency and is available in a small 16-pin QFN (RGT) package.

产品特性

Regulated Output Current With 0.4% Matching
Drives up to 3 LEDs at 25 mA Each
LED Brightness Control Through PWM Control Signal
High Efficiency by Fractional Conversion With 1x and 1.5x Modes
1 MHz Switching Frequency
2.7 V to 6.5 V Operating Input Voltage Range
Internal Softstart Limits Inrush Current
Low Input Ripple and Low EMI
Overcurrent and Overtemperature Protected
Undervoltage Lockout With Hysteresis
Ultra-Small 3mm x 3mm QFN Package
APPLICATIONS
- White LED Backlight for Color Displays in Cellular Phones, Smart Phones, PDAs, Handheld PCs, Digital Cameras, and Camcorders
- Keypad Backlight

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