LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators - Linear Technology（凌力尔特）

The LTC3727/LTC3727-1 are high performance dual step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant 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 shutdown. 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.

Wide Output Voltage Range:0.8V < or = VOUT < or = 14V

Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise

OPTI-LOOP Compensation Minimizes COUT

±1% Output Voltage Accuracy

Power Good Output Voltage Monitor

Phase-Lockable Fixed Frequency 250kHz to 550kHz

Latched Short-Circuit Shutdown (LTC3727 Only)

Dual N-Channel MOSFET Synchronous Drive

Wide VIN Range: 4V to 36V Operation

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Soft-Start Current Ramping

Foldback Output Current Limiting

Output Overvoltage Protection

Low Shutdown IQ: 20μA

Selectable Constant Frequency or Burst Mode Operation

Small 28-Lead SSOP Package

LTC3727-1 Also Available in the 5mm x 5mm QFN Package

Telecom Systems

Automotive Systems

Battery-Operated Digital Devices

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC3727EG-1	SSOP-28	E	$6.93	$4.85
LTC3727EG-1#PBF	SSOP-28	E	$6.93	$4.85
LTC3727EG-1#TR	SSOP-28	E		$4.95
LTC3727EG-1#TRPBF	SSOP-28	E		$4.95
LTC3727EUH-1	5x5 QFN-32	E	$7.21	$5.05
LTC3727EUH-1#PBF	5x5 QFN-32	E	$7.21	$5.05
LTC3727EUH-1#TR	5x5 QFN-32	E		$5.15
LTC3727EUH-1#TRPBF	5x5 QFN-32	E		$5.15
LTC3727IG-1#PBF	SSOP-28	I	$8.43	$5.90
LTC3727IG-1#TRPBF	SSOP-28	I		$5.96

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