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LTC7803 Datasheet(PDF) 1 Page - Analog Devices |
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LTC7803 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 36 page  LTC7803 1 Rev 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum The LTC®7803 is a high performance, 100% Duty Cycle Capable, synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases effi- ciency, reduces power losses and eases thermal require- ments. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803 operates from a wide 4.5V to 40V input supply range. The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP com- pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads. The LTC7803 additionally features spread spectrum oper- ation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interfer- ence (EMI) standards. APPLICATIONS n Automotive and Transportation n Industrial n Military/Avionics n Telecommunications All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. n Low Operating IQ: 12µA (14V VIN to 3.3V VOUT) n Wide Input Voltage Range: 4.5V to 40V n Output Voltage Up to 40V n Spread Spectrum Operation n RSENSE or DCR Current Sensing n PassThru™/100% Duty Cycle Capable n Programmable Fixed Frequency (100kHz to 3MHz) n Phase-Lockable Frequency (100kHz to 3MHz) n Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads n Low Shutdown IQ: 1.2μA n Thermally Enhanced 16-Pin 3mm × 3mm QFN and MSOP Packages n AEC-Q100 Qualification in Progress 4.7nF 6.19k 39pF VIN 5V TO 38V VOUT 3.3V 20A 10µF ×4 0.68µH TRACK//SS ITH MODE FREQ GND 7803 TA01a LTC7803 RUN VIN BOOST SW BG INTVCC SENSE+ SENSE– TG PLLIN/SPREAD VFB EXTVCC 56µF ×2 100µF ×4 0.1µF 0.1µF 1m 215k 68.1k 4.7µF + 470µF + ×2 ×2 VOUT = 3.3V BURST MODE OPERATION FIGURE 11 CIRCUIT VIN = 12V VIN = 24V VIN = 36V OUTPUT CURRENT (A) 0.0001 0.001 0.01 0.1 1 10 30 40 50 60 70 80 90 100 0.1 1 10 100 1k 10k Efficiency vs Output Current 7803 TA01b Efficiency vs Output Current High Efficiency Wide Input Range 375kHz 3.3V/20A Step-Down Regulator |
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