Texas Instruments Introduces a Constant Frequency Charge Pump DC/DC Converter
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TI's TPS60250 can drive the main display of up to five white LEDs and the secondary display of two white LEDs to adjust the constant current to maintain intensity consistency. The TPS60250 features an adaptive charge pump mode and an extremely low dropout regulator for extremely high conversion efficiency over the input voltage range of a single Li-Ion battery. The I2C provides four enable inputs to simplify switching control of the independent display. To reduce the operating current when using a secondary display LED, the device also provides completely independent operation in the secondary display LED.
Main features:
• Input voltage range from 3 V to 6 V;
• 1x and 1.5x charge pumps;
• I2C supports fully programmable currents;
• 64 dimming steps up to 25 mA (primary and secondary display groups);
• 4 dimming steps up to 80 mA (DM5 for auxiliary applications);
• The difference in secondary LED current matching at light load is no more than 2% (100 μA each);
• 750 kHz charge pump frequency;
• Continuous 230 mA maximum output current;
• Automatically switch between 1x and 1.5x modes for maximum efficiency;
• Built-in soft start and current limit function;
• Turn on the light detection;
• 16-pin 3 mm x 3 mm QFN package.
Price and availability
The TPS60250 is available now in volume production and is available through TI and its worldwide network of distributors in a 3 mm x 3 mm 16-pin QFN package.