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.
| Number of channels | 3 |
| Vin (min) (V) | 2.7 |
| Vin (max) (V) | 6.5 |
| Vout (min) (V) | 2.7 |
| Vout (max) (V) | 6.5 |
| Type | Capacitive |
| Switching frequency (max) (kHz) | 1250 |
| Duty cycle (max) (%) | 100 |
| LED current per channel (mA) | 25 |
| Peak efficiency (%) | 90 |
| Topology | Boost |
| Features | Analog Dimming, Analog/PWM mixed dimming, Direct PWM Dimming, Enable/Shutdown, Fault Detection, Integrated Switch, Load Disconnect During Shutdown, Soft Start, Synchronous Rectification, Thermal shutdown |
| Operating temperature range (°C) | -40 to 85 |
| Rating | Catalog |
| VQFN (RGT) | 16 | 9 mm² 3 x 3 |
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