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LTC3727EG Datasheet(PDF) 1 Page - Linear Technology |
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LTC3727EG Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LTC3727/LTC3727-1 3727f High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators Figure 1. High Efficiency Dual 12V/5V Step-Down Converter s Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V s Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise s OPTI-LOOP ® Compensation Minimizes COUT s ±1% Output Voltage Accuracy s Power Good Output Voltage Monitor s Phase-Lockable Fixed Frequency 250kHz to 550kHz s Latched Short-Circuit Shutdown (LTC3727 Only) s Dual N-Channel MOSFET Synchronous Drive s Wide VIN Range: 4V to 36V Operation s Very Low Dropout Operation: 99% Duty Cycle s Adjustable Soft-Start Current Ramping s Foldback Output Current Limiting s Output Overvoltage Protection s Low Shutdown IQ: 20µA s Small 28-Lead SSOP Package s LTC3727-1 Also Available in the 5mm × 5mm QFN Package s Selectable Constant Frequency or Burst Mode ® Operation The LTC ®3727/LTC3727-1 are high performance dual step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A con- stant frequency current mode architecture allows phase- lockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. There is a precision 0.8V reference and a power good output indicator. A wide 4V to 30V (36V maximum) input supply range encompasses all battery chemistries. A RUN/SS pin for each controller provides soft-start, and on the LTC3727GN, optional timed, short-circuit shut- down. Current foldback limits MOSFET heat dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate a secondary winding. The LTC3727/LTC3727-1 include a power good output pin that indicates when both outputs are within 7.5% of their designed set point. s Telecom Systems s Automotive Systems s Battery-Operated Digital Devices , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. + 4.7 µF M2 M1 0.1 µF 105k 1% 1000pF 8 µH 220pF 1 µF CERAMIC 22 µF 50V CERAMIC + 47 µF 6V SP 0.015 Ω 20k 1% 15k VOUT1 5V 5A M4 M3 0.1 µF 280k 1% 15 µH 220pF 1000pF + 56µF 15V SP 0.015 Ω 20k 1% 15k VOUT2 12V 4A TG1 TG2 BOOST1 BOOST2 SW1 SW2 BG1 BG2 SGND PGND SENSE1+ SENSE2+ SENSE1– SENSE2– VOSENSE1 VOSENSE2 ITH1 ITH2 VIN PGOOD INTVCC RUN/SS1 RUN/SS2 VIN 18V TO 28V M1, M2, M3, M4: FDS6680A 1628 F01 0.1 µF 0.1 µF LTC3727/ LTC3727-1 PLLIN DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO |
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