LTC1707 Series

High Efficiency Monolithic Synchronous Step-Down Switching Regulator

Catalog

High Efficiency Monolithic Synchronous Step-Down Switching Regulator

Part	Voltage - Output (Max) [Max]	Output Configuration	Frequency - Switching [Max]	Frequency - Switching [Min]	Topology	Current - Output	Synchronous Rectifier	Supplier Device Package	Output Type	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Function	Voltage - Input (Max) [Max]	Mounting Type	Package / Case	Package / Case [y]	Package / Case [x]	Voltage - Input (Min) [Min]	Voltage - Output (Min/Fixed)
Analog Devices LTC1707CS8#TRPBF	8.5 V	Positive	350 kHz	35 kHz	Buck	600 mA		8-SO	Adjustable	70 °C	0 °C	1	Step-Down	8.5 V	Surface Mount	8-SOIC	3.9 mm	0.154 in	2.85 V	0.8 V

Catalog

High Efficiency Monolithic Synchronous Step-Down Switching Regulator

Key Features

• 600mA Output Current (VIN≥ 4V)

• High Efficiency: Up to 96%

• Constant Frequency: 350kHz Synchronizable to 550kHz

• 2.85V to 8.5V VINRange

• 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

Description

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.ApplicationsCellular TelephonesPortable InstrumentsWireless ModemsRF CommunicationsDistributed Power SystemsSingle and Dual Cell Lithium