LTC3769 Datasheet | Linear Technology

Features n Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation n Wide VIN Range: 4.5V to 60V (65V Abs Max); Operates Down to 2.3V After Start-Up n Output Voltage Up to 60V n ±1% 1.200V Reference Voltage n RSENSE or Inductor DCR Current Sensing n 100% Duty Cycle Capability for Synchronous MOSFET n Low Quiescent Current: 28μA n Phase-Lockable Frequency (75k Hz to 850k Hz) n Programmable Fixed Frequency (50k Hz to 900k Hz) n Power Good Output Voltage Monitor n Low Shutdown Current: 4µA n Internal LDO Powers Gate Drive from VBIAS or EXTVCC n Thermally Enhanced Low Profile 24-Pin 4mm × 4mm QFN Package and 20-Lead TSSOP Package APPLICATIONS n Industrial n Automotive n Medical n Military 60V Low IQ Synchronous Boost Controller DESCRIPTION The LTC®3769 is a high performance single output synchronous boost converter controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements, simplifying high power boost applications. The 28µA no-load quiescent current extends operating run time in battery-powered systems. A 4.5V to 60V input supply range enpasses a wide range of system architectures and battery chemistries. When biased from the output of the boost converter or another auxiliary supply, the LTC3769 can operate from an input supply as low as 2.3V after start-up. The operating frequency can be set within a 50k Hz to 900k Hz range or synchronized to an external clock using the internal PLL. The SS pin ramps the output voltage during start-up. The PLLIN/MODE pin selects Burst Mode® operation, pulseskipping mode or forced continuous mode at light loads. L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6177787, 6498466, 6580258,...