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LT3695 Datasheet(PDF) 1 Page - Linear Technology |
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LT3695 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3695 1 3695f TYPICAL APPLICATION DESCRIPTION 1A Fault Tolerant Micropower Step-Down Regulator The LT®3695 is an adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulator that accepts input volt- ages up to 36V and can safely sustain transient voltages up to 60V. The device includes a high efficiency switch, 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 LT3695 tolerates adjacent pin shorts or an open pin without raising the output voltage above its programmed value. Low ripple Burst Mode operation maintains high effi- ciency at low output currents while keeping output ripple below 15mV in a typical application. 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). Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3695 against short-circuit condi- tions. Frequency foldback and thermal shutdown provide additional protection. The LT3695 is available in a thermally enhanced 16-Pin MSOP package. 5V Step-Down Converter FEATURES APPLICATIONS n Wide Input Range: Operation from 3.6V to 36V Overvoltage Lockout Protects Circuits Through 60V Transients n FMEA Fault Tolerant: Output Stays at or Below Regulation Voltage During Adjacent Pin Short or When a Pin Is Left Floating n 1A Output Current n Low Ripple (< 15mVP-P) Burst Mode® Operation IQ = 75μA for 12VIN to 3.3VOUT with No Load n Adjustable Switching Frequency: 250kHz to 2.2MHz n Short-Circuit Protected n Synchronizable Between 300kHz and 2.2MHz n Output Voltage: 0.8V to 20V n Power Good Flag n Small Thermally Enhanced 16-Pin MSOP Package n Automotive Battery Regulation n Automotive Entertainment Systems n Distributed Supply Regulation n Industrial Supplies Efficiency VIN BD LT3695 RUN/SS VC 0.22μF VOUT 5V 0.9A, VIN > 6.9V 1A, VIN > 12V 102k f = 800kHz 100k 536k 10μH 10μF 3695 TA01a 470pF 2.2μF VIN 6.9V TO 36V TRANSIENT TO 60V RT PG 40.2k 16.2k SYNC BOOST ON OFF SW DA FB GND PGND 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 = 800kHz 3695 TA01b L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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