| 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 |
| 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 |
- 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
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.
