Texas Instruments (TI) has recently introduced a high-efficiency, constant-frequency charge pump DC/DC converter with dual-mode operation, designed to deliver optimal performance across a wide input voltage range. This compact 3 mm x 3 mm micro device features an I2C interface and is fully programmable, making it an excellent choice for modern mobile and handheld applications such as smartphones, PDAs, and multi-display devices.
The TPS60250 is specifically engineered to power up to five white LEDs for the main display and two white LEDs for the secondary display, ensuring consistent brightness through precise current control. It combines an adaptive charge pump mode with an ultra-low dropout regulator, allowing it to maintain high efficiency even when powered by a single Li-Ion battery. The I2C interface offers four enable inputs, simplifying the management of independent display controls. Additionally, the device supports fully independent operation for the secondary display LED, helping to minimize power consumption during low-load conditions.
Key features include:
- Input voltage range from 3 V to 6 V
- 1x and 1.5x charge pump configurations
- Fully programmable currents via I2C
- 64 dimming steps with up to 25 mA per display group
- 4 dimming steps with up to 80 mA for auxiliary applications
- Less than 2% current mismatch in secondary LEDs at light loads
- 750 kHz charge pump frequency
- Maximum output current of 230 mA continuously
- Automatic switching between 1x and 1.5x modes for maximum efficiency
- Built-in soft start and current limit protection
- Light detection capability
- 16-pin 3 mm x 3 mm QFN package
The TPS60250 is now available in full production and can be purchased through TI and its global distributor network. This versatile converter is well-suited for designers looking to optimize power efficiency and brightness control in next-generation portable electronics.
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