Features and Benefits
- Wide Input Range:
- Operation from 3.6V to 36V
- Overvoltage Lockout Protects Circuits through 60V Transients
- 1A Output Current
- Low Ripple Burst Mode® Operation
- IQ = 75μA at 12VIN to 3.3VOUT
- Output Ripple < 15mVP-P
- Adjustable Switching Frequency: 250kHz to 2.2MHz
- Short-Circuit Protected
- Synchronizable Between 300kHz and 2.2MHz
- 0.8V Feedback Reference Voltage
- Output Voltage 0.8V to 20V
- Soft-Start Capability
- Power Good Flag
- Small 12-Pin Thermally Enhanced 3mm × 3mm DFN Package
The LT3682 is an adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 0.5Ω switch is included on the device along with a boost diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between Low Ripple Burst Mode operation and standard PWM operation.
The Low Ripple Burst Mode maintains high efficiency at low output currents while keeping output ripple below 15mV in typical applications. 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 VOUT reaches 90% of the programmed output voltage. Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3682 against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection.
The LT3682 is available in a 12-Pin 3mm × 3mm DFN with exposed pad for low thermal resistance.
- Automotive Battery Regulation
- Automotive Entertainment Systems
- Industrial Supplies
- Power for Portable Products
- Distributed Supply Regulation
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.
Evaluation Kits (1)
Demonstration circuit 1222 is a monolithic stepdown DC/DC switching regulator featuring the LT3682. The demo board is designed for 5V at 1A (VIN > 12V) from a 6.9V to 36V input, with transients up to 60V.
Tools & Simulations
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Sample & Buy
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