The LTC ®1707 is a high efficiency monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.85V, making it suitable for both single and dual lithium-ion battery-powered applications. Burst Mode op- eration provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, extend- ing operating time in battery-powered systems. The switching frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For noise sensitive applications it can be externally synchro- nized up to 550kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low preventing low frequency ripple from interfer- ing with audio circuitry. Soft-start is provided by an external capacitor. The internal synchronous MOSFET switch increases effi- ciency and eliminates the need for an external Schottky diode, saving components and board space.
The LTC1707 is a monolithic synchronous buck regulator offering up to 96% efficiency, 600 mA output current, and operation from 2.85 V to 8.5 V input. It features a 0.8 V feedback reference, low quiescent current (200 µA), and a shutdown current of only 11 pA, making it suitable for battery‑powered devices.
The document provides absolute maximum ratings, electrical characteristics, pin descriptions, functional diagrams, and guidance on external synchronization, burst‑mode operation, and component selection for optimal performance in cellular phones, wireless modems, and lithium‑ion battery applications.
| Maximum Output Current | 600 mA |
|---|---|
| Efficiency | Up to 96 % |
| Input Voltage Range | 2.85 V to 8.5 V |
| Feedback Reference Voltage | 0.8 V |
| Quiescent Current | 200 µA |
| Shutdown Current | 11 pA |
Apply a TTL/CMOS compatible clock signal with a frequency between 385 kHz and 550 kHz to the SYNC/MODE pin.
Leave the SYNC/MODE pin floating or tie it to a logic high to enable Burst Mode.
The device is supplied in an 8‑lead plastic small‑outline (SO) package.