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LT3685 Datasheet(PDF) 1 Page - Linear Technology |
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LT3685 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT3685 1 3685fb TYPICAL APPLICATION APPLICATIONS 36V, 2A, 2.4MHz Step-Down Switching Regulator The LT®3685 is an adjustable frequency (200kHz to 2.4MHz) monolithic step-down switching regulator that accepts input voltages up to 38V operating and 60V maximum. An internal overvoltage protection circuit turns off the power switch when VINisabove38Vtypical(36Vminimum)which then allows the part to safely withstand 60V transients. A high efficiency 0.25 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. The LT3685’s high operating frequency allows the use of small, low cost inductors and ceramic capacitors result- ing in low output ripple while keeping total solution size to a minimum. The low current shutdown mode 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 89% of the programmed output voltage. The LT3685 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance. ■ Automotive Battery Regulation ■ Set Top Box ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation 3.3V Step-Down Converter SW FB VC PG RT VIN BD VIN 4.5V TO 36V TRANSIENT TO 60V VOUT 3.3V 2A 4.7μF 0.47μF 470pF 22μF 100k 14k 40.2k 4.7μH 316k GND OFF ON LT3685 3685 TA01 RUN/SS BOOST SYNC Efficiency LOAD CURRENT (A) 0 50 0.5 1.0 1.5 2 3685 TA01b 60 100 90 80 70 VIN = 12V L = 5.6μH F = 800 kHz VOUT = 3.3V VOUT = 5V , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Wide Input Range: Operation From 3.6V to 36V Overvoltage Lockout Protects Circuit through 60V Transients ■ 2A Maximum Output Current ■ Adjustable Switching Frequency: 200kHz to 2.4MHz ■ Low Shutdown Current: IQ < 1μA ■ Integrated Boost Diode ■ Synchronizable Between 250kHz to 2MHz ■ Power Good Flag ■ Saturating Switch Design: 0.25 On-Resistance ■ 0.790V Feedback Reference Voltage ■ Output Voltage: 0.79V to 20V ■ Soft-Start Capability ■ Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages FEATURES DESCRIPTION |
Similar Part No. - LT3685_15 |
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Similar Description - LT3685_15 |
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