TPS60250是TI公司新推出的一款高效固定频率的DC/DC逆变充电泵，使用1× 和 1.5×两中模式，以此来最优化输入电压范围，可以同是驱动5个白色LED灯和两个白色辅路LED灯，如下是其英文简介
The TPS60250 is a high efficiency, constant frequency charge pump DC/DC converter that uses a dual mode 1× and 1.5× conversion to maximize efficiency over the input voltage range. It drives up to five white LEDs for a main display and up to two white LEDs for a sub display with regulated constant current for uniform intensity. By utilizing adaptive 1×/1.5× charge pump modes and very low-dropout current regulators, the TPS60250 achieves high efficiency over the full 1-cell lithium-battery input voltage range.
Four enable inputs, ENmain, ENsub1, ENsub2, and ENaux, available through I2C, are used for simple on/off controls for the independent main, sub1, sub2, and DM5 displays, respectively. To lower operating current when using one sub display LED, the device provides completely separate operation in sub display LEDs.
The TPS60250 is available in a 16-pin 3mmx3mm thin QFN.
- 3.0-V to 6.0-V Input Voltage Range
- ×1 and ×1.5 Charge Pump
- Fully Programmable Current with I2C
- 64 Dimming Steps with 25mA Maximum (Sub and Main Display Banks)
- 4 Dimming Steps with 80mA Maximum (DM5 for Auxiliary Application)
- 2% Current Matching for Sub LEDs at Light Load Condition (Each 100µA)
- 750-kHz Charge Pump Frequency
- Continuous 230-mA Maximum Output Current
- Auto Switching Between ×1 and ×1.5 Mode for Maximum Efficiency
- Built-in Soft Start and Current Limit
- Open Lamp Detection
- 16-Pin 3mm x 3mm QFN
- APPLICATIONS
- Cellular Phones
- PDA, PMP, GPS (Up To 4 Inch LCD Display)
- Multidisplay Handheld Devices