Integrated triple-output synchronous buck converters

August 01, 2014 // By Graham Prophet
Texas Instruments' latest generation of its monolithic, integrated triple-output synchronous step-down switching regulators offer smaller footprints and higher efficiency. The TPS65261 and TPS65262 DC/DC converters feature small QFN packages and up to 96% efficiency.

TPS65261 and TPS65262 feature 4.5-V to 18-V input supply voltage range for intermediate bus voltages operating off 5-V, 9-V, 12-V or 15-V power buses or batteries; constant-frequency peak current mode simplifies design and enables system optimisation; their 5 x 5 x 0.9-mm QFN package is smaller than the previous generation; an 0.6-V feedback reference supports processors demanding lower output voltage.

The chips have integrated automatic power up/down sequencing for simple power control. TPS65261 provides 82% light load efficiency at 10 mA and offers three outputs of rated current at 3A/2A/2A. It features an adjustable 250-kHz to 2-MHz switching frequency with pulse skipping. For forced continuous current operation without pulse skipping, the TPS65261-1 provides fixed 600-kHz switching operation and offers three outputs of rated current at 3A/1A/1A. Two integrated 200-mA and 100-mA low drop-out voltage linear regulators (LDOs) simplify board layout. For digital multi-media applications requiring higher current, TI has the TPS65262-1 with integrated 350-mA and 150-mA LDOs.

In a 32-pin QFN package, the TPS65261 is priced at $1.90 and the TPS65262 at $2.05 both (1000). They come with the TPS65261EVM or TPS65262EVM evaluation modules.

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