0
ACTIVE
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
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.
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