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LT3958IUHEPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT3958IUHEPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LT3958 1 3958f n Wide Input Voltage Range: 5V to 80V n Single Feedback Pin for Positive or Negative Output Voltage n Internal 3.3A/84V Power Switch n Current Mode Control Provides Excellent Transient Response n Programmable Operating Frequency (100kHz to 1MHz) with One External Resistor n Synchronizeable to an External Clock n Low Shutdown Current < 1μA n Internal 7.2V Low Dropout Voltage Regulator n Programmable Input Undervoltage Lockout with Hysteresis n Programmable Soft-Start n Thermally Enhanced QFN (5mm × 6mm) Package TYPICAL APPLICATION DESCRIPTION High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter The LT®3958 is a wide input range, current mode, DC/DC converter which is capable of generating either positive or negative output voltages. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 84V at 3.3A and driven from an internal regulated 7.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3958 can be set with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 5V, and a low shutdown quiescent current of less than 1μA, make the LT3958 ideally suited for battery-powered systems. The LT3958 features soft-start and frequency foldback functions to limit inductor current during start-up. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. High Efficiency Boost Converter FEATURES APPLICATIONS n Automotive n Telecom n Industrial Efficiency vs Output Current SENSE2 SENSE1 LT3958 33μH VIN SW GND FBX RT SS INTVCC EN/UVLO SYNC SGND 53.6k VC 3958 TA01a 392k 41.2k 300kHz 4.7μF 0.33μF 10k 10nF 464k 15.8k 4.7μF 2 VOUT 48V 0.5A VIN 12V TO 40V 4.7μF OUTPUT CURRENT (mA) 0 70 75 80 85 90 95 100 100 200 300 400 3958 TA01b 500 VIN = 24V |
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