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LTC3859AL Datasheet(PDF) 1 Page - Linear Technology |
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LTC3859AL Datasheet(HTML) 1 Page - Linear Technology |
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1 / 38 page  LTC3899 1 3899fa For more information www.linear.com/LTC3899 TYPICAL APPLICATION FEATURES DESCRIPTION 60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller The LTC®3899 is a high performance triple output (buck/ buck/boost) DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. The constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The LTC3899 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3899 can operate from an input supply as low as 2.2V after start-up. The gate drive for the LTC3899 can be programmed from 5V to 10V to allow the use of logic-level or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes. The 29μA no-load quiescent current extends op- eratingruntimeinbattery-poweredsystems.OPTI-LOOP® compensationallowsthetransientresponsetobeoptimized over a wide range of output capacitance and ESR values. High Efficiency Wide Input Range Dual 5V/8.5V Converter Efficiency vs Output Current APPLICATIONS n DualBuckPlusSingleBoost SynchronousControllers n Wide Bias Input Voltage Range: 4.5V to 60V n Outputs Remain in Regulation Through Cold Crank Down to a 2.2V Input Supply Voltage n Buck and Boost Output Voltages Up to 60V n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) n No External Bootstrap Diodes Required n Low Operating IQ: 29μA (One Channel On) n 100% Duty Cycle for Boost Synchronous MOSFET n Phase-Lockable Frequency (75kHz to 850kHz) n Programmable Fixed Frequency (50kHz to 900kHz) n Very Low Dropout Operation: 99% Duty Cycle (Bucks) n Low Shutdown IQ: 3.6μA n Fixed or Adjustable Boost Output Voltage Saves IQ n Small 38-Lead 5mm × 7mm QFN and TSSOP Packages n Automotive Always-On and Start-Stop Systems n Distributed DC Power Systems n Multioutput Buck-Boost Applications 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 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. 68.1k 649k TG1 RUN1, 2, 3 LTC3899 VBIAS 0.1µF 0.1µF 0.1µF 4.9µH 1.2µH 3m 68.1k 357k VOUT1 5V 5A VOUT2 8.5V 3A 9m BG1 VFB1 VFB2 SENSE1+ SENSE1– SENSE2+ SENSE2– SENSE3– SENSE3+ DRVCC INTVCC DRVSET BOOST1 TG3 BOOST3 SW3 BG3 ITH1,2,3 VFB3 SW1 TG2 BG2 GND BOOST2 SW2 6.5µH 15m 220µF 33µF 0.1µF 4.7µF 33µF VOUT3 REGULATED AT 10V WHEN VIN < 10V FOLLOWS VIN WHEN VIN > 10V VIN 2.2V TO 60V (START-UP ABOVE 5V) 68µF 3899 TA01a VPRG3 OUTPUT CURRENT(A) 0.01 95 94 92 90 93 91 89 88 1 3899 TA01b 10 0.1 VIN = 12V VOUT = 5V Burst Mode OPERATION 5V 6V 8V 10V GATE DRIVE (DRVCC) |
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