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LTC7802EUFDM Datasheet(PDF) 1 Page - Analog Devices |
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LTC7802EUFDM Datasheet(HTML) 1 Page - Analog Devices |
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1 / 34 page  LTC7802 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 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 oper- ates 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 oper- ating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be opti- mized over a wide range of output capacitance and ESR values. The LTC7802 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 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 Wide Input Voltage Range: 4.5V to 40V n Wide Output Voltage Range: 0.8V to 99% • VIN n Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On) 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 Small 28-Lead 4mm × 5mm QFN 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 210k 68.1k 330µF 0.1µF 0.1µF 1.8µH 3m 0.1µF 357k 68.1k 220µF LTC7802 SW1 BG1 TG1 BOOST1 SENSE1+ SENSE1– RUN1 VIN RUN2 INTVCC INTVCC EXTVCC VFB1 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 7802 TA01a |
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