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LT3682 Datasheet(PDF) 1 Page - Linear Technology |
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LT3682 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT3682 1 3682f TYPICAL APPLICATION DESCRIPTION 1A Micropower Step-Down Switching Regulator The LT ®3682 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. 5V Step-Down Converter L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES APPLICATIONS n Automotive Battery Regulation n Automotive Entertainment Systems n Industrial Supplies n Power for Portable Products n Distributed Supply Regulation n Wide Input Range: Operation from 3.6V to 36V Overvoltage Lockout Protects Circuits through 60V Transients n 1A Output Current n Low Ripple Burst Mode ® Operation IQ = 75μA at 12VIN to 3.3VOUT Output Ripple < 15mVP-P n Adjustable Switching Frequency: 250kHz to 2.2MHz n Short-Circuit Protected n Synchronizable Between 300kHz and 2.2MHz n 0.8V Feedback Reference Voltage n Output Voltage 0.8V to 20V n Soft-Start Capability n Power Good Flag n Small 12-Pin Thermally Enhanced 3mm × 3mm DFN Package Efficiency VIN 6.9V TO 36V TRANSIENT TO 60V VOUT 5V 0.9A, VIN 6.9V 1A, VIN 12V 2.2μF 16.2k 40.2k 470pF 102k 10μF 536k 0.22μF 10μH 3682 TA01 OFF ON VIN BD GND PGND LT3682 RUN/SS VC RT SYNC PG BOOST SW DA FB f = 800kHz LOAD CURRENT (A) 0 50 60 70 80 90 100 0.2 0.4 0.6 0.8 1 VOUT = 5V VOUT = 3.3V VIN = 12V L = 10µH f = 800 kHz 3682 TA01b |
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Similar Description - LT3682_15 |
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