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LT3973-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT3973-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT3973/LT3973-3.3/LT3973-5 1 3973fb For more information www.linear.com/LT3973 TYPICAL APPLICATION DESCRIPTION 42V, 750mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes The LT®3973 is an adjustable frequency monolithic buck switchingregulatorthatacceptsawideinputvoltagerange up to 42V, and consumes only 2.5µA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, controlandlogiccircuitry.LowrippleBurstModeoperation maintainshighefficiencyatlowoutputcurrentswhilekeep- ing the output ripple below 10mV in a typical application. A minimum dropout voltage of 530mV is maintained when theinputvoltagedropsbelowtheprogrammedoutputvolt- age, such as during automotive cold crank. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions, with thermalshutdownprovidingadditionalfaultprotection.An accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.75µA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3973 is available in small, thermally enhanced 10-lead MSOP and 3mm × 3mm DFN packages. L , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 5V Step-Down Converter FEATURES APPLICATIONS n Ultralow Quiescent Current n 2.5µA IQ at 12VIN to 3.3VOUT n Low Ripple Burst Mode® Operation n Output Ripple < 10mVP-P n Wide Input Voltage Range: 4.2V to 42V Operating n Adjustable Switching Frequency: 200kHz to 2.2MHz n Integrated Boost and Catch Diodes n 750mA Output Current n Excellent Start-Up and Dropout Performance n Fixed Output Voltages: 3.3V, 5V n 1.9µA IQ at 12VIN n Accurate Programmable Undervoltage Lockout n Low Shutdown Current: IQ = 0.75µA n Internal Catch Diode Current Limit n Power Good Flag n Thermal Shutdown n Small, Thermally Enhanced 10-Lead MSOP and (3mm × 3mm) DFN Packages n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies n Gate Drive Bias VIN BOOST LT3973 SW EN/UVLO PG RT C3 0.47µF 15pF C2 22µF C1 4.7µF VIN 5.6V TO 42V VOUT 5V 750mA 1M 316k 215k f = 600kHz L1 15µH BD OUT FB GND OFF ON 3973 TA01a Efficiency LOAD CURRENT (mA) 0.01 40 80 70 60 50 90 100 0.1 1 3973 TA01b 10 0.01 10 100 1 0.1 1000 VIN = 12V |
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