Features and Benefits
- 600mA Output Current (VIN ≥ 4V)
- High Efficiency: Up to 96%
- Constant Frequency: 350kHz Synchronizable to 550kHz
- 2.85V to 8.5V VIN Range
- 0.8V Feedback Reference Allows Low Voltage Outputs: 0.8V ≤ VOUT ≤ VIN
- No Schottky Diode Required
- 1.19V ±1% Reference Output Pin
- Selectable Burst Mode™ Operation/Pulse Skipping Mode
- Low Dropout Operation: 100% Duty Cycle
- Precision 2.7V Undervoltage Lockout
- Current Mode Control for Excellent Line and Load Transient Response
- Low Quiescent Current: 200µA
- Shutdown Mode Draws Only 11µA Supply Current
- Available in 8-Lead SO Package
The LTC1707 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 operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, extending 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 synchronized up to 550kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low preventing low frequency ripple from interfering with audio circuitry. Soft-start is provided by an external capacitor.
The internal synchronous MOSFET switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. Low output voltages down to 0.8V are easily achieved due to the 0.8V internal reference. The LTC1707 comes in an 8-lead SO package.
- Cellular Telephones
- Portable Instruments
- Wireless Modems
- RF Communications
- Distributed Power Systems
- Single and Dual Cell Lithium
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.