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LTC7802EUFDM-3.3 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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LTC7802EUFDM-3.3 bảng dữ liệu(HTML) 1 Page - Analog Devices |
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1 / 34 page  LTC7802-3.3 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum The LTC®7802-3.3 is a high performance dual step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant fre- quency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7802-3.3 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase. 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 LTC7802-3.3 features a precision 0.8V reference and power good output indicators. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads. The LTC7802-3.3 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output sup- plies, making it easier to comply with electromagnetic interference (EMI) standards. APPLICATIONS n Wide Input Voltage Range: 4.5V to 40V n Wide Output Voltage Range: 0.8V to 99% • VIN n Low Operating IQ: 12μA (14V to 3.3V, Channel 1 On) n Fixed 3.3V Output Voltage on Channel 1 n Spread Spectrum Operation n RSENSE or DCR Current Sensing n Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise 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 Very Low Dropout Operation: 99% Duty Cycle n Power Good Output Voltage Monitors n Output Overvoltage Protection n Internal LDO Powers Gate Drive from VIN or EXTVCC n Low Shutdown IQ: 1.5μA n Side Wettable 4mm × 5mm QFN-28 Package n Automotive and Transportation n Industrial n Military / Avionics All registered trademarks and trademarks are the property of their respective owners. VOUT2 VOUT1 VIN 0.1µF 0.9µH 2m 4.7µF 330µF 0.1µF 0.1µF 1.8µH 3m 0.1µF 357k 68.1k 220µF LTC7802-3.3 SW1 BG1 TG1 BOOST1 SENSE1+ SENSE1– RUN1 VIN RUN2 INTVCC INTVCC EXTVCC VOUT1 ITH1 TRACK/SS1 GND SW2 BG2 TG2 BOOST2 SENSE2+ SENSE2– VFB2 ITH2 TRACK/SS2 MODE PLLIN/SPREAD 3.3V/12A 5V/10A 4.5V TO 40V FREQ 780233 TA01a |
Số phần tương tự - LTC7802EUFDM-3.3 |
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Mô tả tương tự - LTC7802EUFDM-3.3 |
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