TI 公司的TPS65137 是有源矩阵 OLED（AMOLED）电源解决方案，包括一个采用LDO作为后稳压器的升压转换器，输入电压从2.3V到5.5V，具有极好的线瞬态稳压功能，输出电压精度1%，低噪音，输出电流200mA，固定4.6V正输出电压，数字可编程负输出电压可低至-5.2V，具有短路保护和热关断，主要用在有源矩阵 OLED（AMOLED）。本文介绍了TPS65137主要特性，方框图以及典型应用电路。
The TPS65137 consists of a boost converter using a LDO as post regulator. The output voltage of the boost converter is regulated to operate the internal LDO above its dropout voltage maintaining best line and load regulation of OUTP. The internal LDO disconnects OUTP during shutdown and allows regulation of the output when the input voltage is higher than OUTP. The LDO minimizes the output voltage ripple of OUTP. The negative output uses a buck boost converter topology operating in DCM (Discontinuous Conduction Mode) providing superior line regulation. In order to adjust the output voltage of the negative converter a digital interface can be used to program the output voltage. To achieve high efficiency over the entire load current range the device reduces the switching frequency with the load current using its internal voltage controlled oscillator (VCO). Since the boost converter output CB is post regulated by the integrated LDO (Low Dropout Regulator) the output voltage ripple is minimized and the line transient response is at its best. Because of this topology the operation mode of the boost converter has minimum effect on the output voltage ripple observed on OUTP. The boost converter, as well as the negative converter operate in peak current mode using the VCO (Voltage Controlled Oscillator) while operating in DCM (Discontinuous Conduction Mode). When entering CCM (Continuous Conduction Mode) the converter operates in peak current control using fixed off time control.
TPS65137主要特性：
2.3 V to 5.5 V Input Voltage Range
1% Output Voltage Accuracy Vpos
Excellent Line Transient Regulation
Low Noise Operation
200 mA Output Current
Fixed 4.6 V Positive Output Voltage
Digitally Programmable Negative Output Voltage Down to –5.2V
–4.9V Default Value for Vneg
Advanced Power Save Mode
Short Circuit Protection
Thermal Shutdown
TPS65137A High impedance output in shutdown
3×3 mm 10 Pin QFN Package
TPS65137应用：
Active Matrix OLED Power Supply
图1。TPS65137功能方框图
图2。TPS65137典型应用电路图
详情请见：
http://focus.ti.com/lit/ds/symlink/tps65137.pdf
