Texas Instruments (TI) today announced a high-efficiency constant-frequency charge pump DC/DC converter with dual-mode conversion for maximum conversion efficiency over the input voltage range. The 3mm x 3mm micro-mini device features an I2C interface and is fully programmable, making it ideal for a wide range of applications including cell phones, PDAs and multi-display handheld devices.
TI's TPS60250 can drive up to five white LED main displays and two white LED sub-displays to adjust the constant current to maintain intensity consistency. The TPS60250 uses an adaptive charge pump mode and an extremely low dropout regulator to achieve 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:
3V to 6V input voltage range;
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 under light load conditions does not exceed 2% (100 μA each);
750 kHz charge pump frequency;
Continuous 230 mA maximum output current;
For maximum efficiency, automatically switch between 1x and 1.5x modes;
Built-in soft start and current limit function;
Turn on the light detection;
16-lead 3mm x 3mm 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 3mm x 3mm 16-pin QFN package.
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