LT3958 Datasheet | Linear Technology

Features 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 (100k Hz 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 Applications n Automotive n Tele n Industrial High Input Voltage, Boost, Flyback, SEPIC and Inverting Converter Description 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 100k Hz 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 Thin SOT are trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Patents pending. Typical Application VIN 12V TO 40V High Efficiency Boost Converter 33µH 4.7µF 392k EN/UVLO 53.6k SGND SYNC RT SS LT3958 VC SENSE1 SENSE2 FBX INTVCC 41.2k 300k Hz 0.33µF 10k 4.7µF 10n...