High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

The LTC3727LX-1 is a high performance dual step-down switching regulator controller that drives 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 28V (32V maximum) input supply range encompasses all battery chemistries.

VIN Range

VREF Accuracy Over Temp

Latch-Off

Min On-Time

LTC3727

4V - 36V

±1%

No

180ns

LTC3727-1

4V - 36V

±1%

Yes

180ns

LTC3727A-1

4V - 36V

±1%

No

120ns

LTC3727LX-1

4V - 32V

±1.5%

No

120ns

Applications

* Telecom Systems

* Automotive Systems

* Distributed DC Power Systems

* Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V

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

* OPTI-LOOP® Compensation Minimizes COUT

* ±1.5% Output Voltage Accuracy

* Power Good Output Voltage Monitor

* Phase-Lockable Fixed Frequency 250kHz to 550kHz

* Dual N-Channel MOSFET Synchronous Drive