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LTC3823EGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC3823EGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 26 page  LTC3823 1 3823fd FEATURES APPLICATIONS DESCRIPTION Fast No RSENSETM Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL The LTC ®3823 is a synchronous step-down switching regu- lator controller with true remote differential output sensing andoutputvoltageup/downtrackingcapability.Itsadvanced functionsandhighaccuracyreferenceareidealforpowering high performance server, ASIC and computer memory systems. The LTC3823 uses a constant on-time, valley current mode control architecture to deliver very low duty fac- tors without requiring a sense resistor. The operating frequency is selected by an external resistor and is com- pensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock. Fault protection is provided by an overvoltage compara- tor and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to as low as a 0.6V output. When using remote sense, output voltages up to 3.3V can be developed, and up to 90% of VIN without remote sense. Power supply sequencing is accomplished using an external soft-start timing capacitor. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611. n Wide VIN Range: 4.5V to 36V n ±0.67%, 0.6V Reference Voltage n Output Voltage Tracking Capability n True Remote Sensing Differential Amplifier n Sense Resistor Optional n True Current Mode Control n 2% to 90% Duty Cycle at 200kHz n tON(MIN) < 100ns n Phase-Locked Loop Frequency Synchronization n Powerful Dual N-Channel MOSFET Driver n Adjustable Cycle-by-Cycle Current Limit n Adjustable Switching Frequency n Programmable Soft-Start n Current Foldback Protection (Disabled at Start-Up) n Output Overvoltage Protection n Micropower Shutdown: 30μA n Power Good Output Voltage Monitor Tracks the Reference Input Pin n Available in (5mm × 5mm) 32-Lead QFN and 28-Lead SSOP Narrow Packages n Distributed Power Systems n Server Power Supplies CMDSH-3 B340A 9.5k 1.8μH 10μF 10μF 35V 3 VIN 5V TO 28V VOUT 2.5V 10A 180μF 4V 2 Si4874 Si4884 68k 0.1μF 0.22μF 10k 1000pF VOUT 3k 10k 0.01μF + ION VIN TG SW BOOST PLLIN RUN ITH SGND INTVCC BG PGND SENSE– SENSE+ VOUTSENSE+ VFB LTC3823 DRVCC PGOOD VOUTSENSE– VDIFFOUT VON VRNG TRACK/SS PLLFLTR 3823 TA01a LOAD CURRENT (A) 0.1 87 88 90 91 92 97 94 0.01 0.1 10 1 1 3823 TA01b 89 95 96 93 10 VIN = 5V VOUT = 2.5V FIGURE 12 CIRCUIT EFFICIENCY POWER LOSS Efficiency and Power Loss vs Load Current High Efficiency Step-Down Converter TYPICAL APPLICATION |
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