LT3680 Datasheet

Part No.

In Stock

Price

Packaging

SPQ

Marking

MSL

Pins

Temp Range

Package Description

• Wide Input Voltage Range: 3.6V to 36V
• 3.5A Maximum Output Current
• Low Ripple (<15mV_P-P) Burst Mode^® Operation:
  • I_Q = 75µA at 12V_IN to 3.3V_OUT
• Adjustable Switching Frequency: 200kHz to 2.4MHz
• Low Shutdown Current: I_Q < 0.5µA
• Integrated Boost Diode
• Synchronizable Between 250kHz to 2MHz
• Power Good Flag
• Saturating Switch Design: 95mΩ On-Resistance
• 0.790V Feedback Reference Voltage
• Output Voltage: 0.79V to 30V
• Thermal Protection
• Soft-Start Capability
• Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

• Automotive Battery Regulation
• Power for Portable Products
• Distributed Supply Regulation
• Industrial Supplies
• Wall Transformer Regulation

The LT3680 is an adjustable frequency (200kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 95mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode^® operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application. In addition, the LT3680 can further enhance low output current efficiency by drawing bias current from the output when V_OUT is above 3V. Shutdown reduces input supply current to less than 1µA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when V_OUT reaches 91% of the programmed output voltage. The LT3680 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.