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Buck regulator with dual LDOs maximizes battery run-time

Milpitas, Calif. — Linear Technology has released a 400-mA, 2.25-MHz, synchronous buck regulator with two 150-mA LDOs packaged in a 2 x 3-mm DFN. The LTC3670's switching regulator and both LDOs are adjustable down to 0.8 V, offering a very compact triple-output converter for handheld device applications. The input voltage range of 2.5 V to 5.5 V makes it well-suited for single-cell Li-ion powered applications.

The adjustable outputs are suitable for powering I/O, memory and core voltages of the latest DSPs and microcontrollers while each channel offers an independent enable pin. The buck regulator's 2.25-MHz switching frequency enables the use of tiny, low-cost external components, providing a very compact solution for handheld applications.

The LTC3670's synchronous buck delivers efficiencies as high as 93% and the constant-frequency, current-mode operation minimizes noise while offering fast transient response. The internal LDOs require only 150 mV of dropout voltage, providing two additional low noise outputs. The BurstMode operation minimizes quiescent current to only 70 uA in no load conditions, maximizing battery run-time. Other features include a Power-Good pin, internal soft-start and internal compensation.

Pricing: Starts at $1.95 each in quantities of 1,000.
Availability: From stock in a 12-lead 2 x 3-mm DFN package.
Product information: LTC3670

Linear Technology Corp. , 1-408-432-1900, www.linear.com

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