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LTC3853 Arkusz danych(PDF) 1 Page - Linear Technology |
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LTC3853 Arkusz danych(HTML) 1 Page - Linear Technology |
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1 / 36 page  LTC3853 1 3853fc For more information www.linear.com/LTC3853 TYPICAL APPLICATION FEATURES DESCRIPTION Triple Output, Multiphase Synchronous Step-Down Controller The LTC®3853 is a high performance triple output step- down switching regulator controller that drives all N- channel synchronous power MOSFET stages. Power loss and supply noise are minimized by operating the output stages out of phase. The part can be configured as a dual phase controller plus a single phase controller if needed. Thepartcanalsobeconfiguredtoprovideasingle3-phase output for even higher output currents. A wide 4.5V to 24V (28V maximum) input voltage sup- ply range encompasses most battery chemistries and intermediate bus voltages. Phase 3 can regulate output voltages up to 13.5V. A constant-frequency current mode architecture allows for a phase-lockable frequency up to 750kHz. Independent TK/SS pins for each output ramps the output voltagesandcanbeconfiguredforcoincidentorratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping or continuous inductor current modes. High Efficiency Triple 5V/3.3V/1.2V Step-Down Converter n Triple, 120° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n Configurable as a 180° Dual Phase Controller Plus a Single Phase Controller n The Third Phase Can Regulate Up to a 13.5V Output n High Efficiency: Up to 92% n RSENSE or DCR Current Sensing n ±0.75% 0.8V Output Voltage Accuracy n Phase-Lockable Fixed Frequency 250kHz to 750kHz n Supports Pre-Biased Outputs n Dual N-Channel MOSFET Synchronous Drive n Wide VIN Range: 4.5V to 24V Operation (28V Abs Max) n Adjustable Soft-Start Current Ramping or Tracking n Foldback Output Current Limiting n Output Overvoltage Protection n Dual Power Good Output Voltage Monitors n 40-Lead 6mm × 6mm QFN Package L , LT, LTC, LTM, Linear Technology, Burst Mode, Polyphase 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, 6100678, 6144194, 6177787, 6304066, 6580258. TG1 TG2 BOOST1,2,3 SW1 SW2 BG1 BG2 SENSE1+ SENSE2+ SENSE1– SENSE2– VFB1 VFB2 ITH1,2,3 VIN INTVCC LTC3853 MODE/PLLIN 20k FREQ/PLLFLTR ILIM PGND PGOOD12 SGND TK/SS1,2,3 VFB3 SENSE3– SENSE3+ SW3 TG3 BG3 RUN1,2,3 PGOOD3 2.2k 15k 20k 63.4k 0.1µF 4.7µF 10k fIN 500kHz VOUT1 5V 5A VOUT2 3.3V 5A 20k 1k 2.2k VOUT3 1.2V 5A VIN 7V TO 24V 1500pF 100µF 10V 220pF 10nF 22µF 50V 0.1µF 0.1µF 2.2µH 2.2µH 1µH 0.1µF SW1,2,3 0.1µF + 100µF 6V + 100µF 6V + 10k 105k |
Podobny numer części - LTC3853_15 |
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Podobny opis - LTC3853_15 |
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