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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 / 42 page  LTC7811 1 Rev. 0 For more information www.analog.com Document Feedback DESCRIPTION TYPICAL APPLICATION 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Controller The LTC®7811 is a high performance triple output (buck/ buck/boost) DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Its constant frequency current mode architecture allows a phase-lock- able switching frequency of up to 3MHz. The LTC7811 operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7811 can operate from an input supply as low as 1V after start-up. The very low no-load quiescent current extends operating run time 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 LTC7811 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The LTC7811 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. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. FEATURES APPLICATIONS n Dual Synchronous Buck Plus Single Boost Controllers n Low Operating IQ: n 14μA (14V to 3.3V, Channel 1 On) n Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage n Wide Bias Input Voltage Range: 4.5V to 40V n Buck Output Voltages Up to 40V n Boost Output Voltage Limited Only by External Components n Spread Spectrum Operation n RSENSE or DCR Current Sensing n Low Battery Indicator for Automotive Applications 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 Boost Channel Current Monitor Output n Low Shutdown IQ: 1.5μA n Small 40-Lead 6mm × 6mm QFN Package n AEC-Q100 Automotive Qualification in Progress n Automotive and Transportation n Industrial n Military/Avionics LTC7811 Response to a Cold Crank Automotive Waveform 2.2µH 6m 150µF 0.1µF 0.1µF 2.4µH 6m 22µF 100µF 22µF 47µF 0.1µF 4.7µH 9m 357k 68.1k 7811 TA01a 10µF 100µF 210k 68.1k 4.7µF 1V TO 38V START-UP ABOVE 5V LTC7811 VBIAS RUN1,2,3 BG3 SENSE3+ VFB3 ITH1,2,3 TRACK/SS1,2,3 SENSE3– SW1 BG1 TG1 BOOST1 SENSE1+ VFB1 SENSE1– VIN 3.3V VOUT1 6A VOUT3 REGULATED TO 9.5V WHEN VIN < 9.5V FOLLOWS VIN WHEN VIN > 9.5V SW2 BG2 TG2 BOOST2 SENSE2+ VFB2 5V SENSE2– EXTVCC VOUT2 VOUT2 4A INTVCC BOOST1,2 FREQ PLLIN/SPREAD VPRG3 VOUT3 MODE VOUT3 GND VOUT3 VOUT2 VOUT1 VBATT TIME (10ms/DIV) 0V VOLTAGE 2V/DIV Automotive Waveform LTC7811 Response to a Cold Crank 7811 TA01b |
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