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

The LTC®3727/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

产品特点 Features
  • 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
应用
  • Telecom Systems
  • Automotive Systems
  • Battery-Operated Digital Devices
典型应用图
LTC3727 典型应用
参数
LTC3727 参数
LTC3727 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LTC3727AEG-1 SSOP 28 E $6.93  $4.85 
LTC3727AEG-1#PBF SSOP 28 E $6.93  $4.85 
LTC3727AEG-1#TR SSOP 28 E $4.91 
LTC3727AEG-1#TRPBF SSOP 28 E $4.91 
LTC3727AIG-1#PBF SSOP 28 I $8.43  $5.90 
LTC3727AIG-1#TRPBF SSOP 28 I $5.96 
LTC3727EG SSOP 28 E $6.93  $4.85 
LTC3727EG#PBF SSOP 28 E $6.93  $4.85 
LTC3727EG#TR SSOP 28 E $4.95 
LTC3727EG#TRPBF SSOP 28 E $4.95 
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 QFN 32 E $7.21  $5.05 
LTC3727EUH-1#PBF QFN 32 E $7.21  $5.05 
LTC3727EUH-1#TR DFN 32 E $5.15 
LTC3727EUH-1#TRPBF DFN 32 E $5.15 
LTC3727IG-1#PBF SSOP 28 I $8.43  $5.90 
LTC3727IG-1#TRPBF SSOP 28 I $5.96 
LTC3727LXEG-1 SSOP 28 E $6.21  $4.35 
LTC3727LXEG-1#PBF SSOP 28 E $6.21  $4.35 
LTC3727LXEG-1#TR SSOP 28 E $4.45 
LTC3727LXEG-1#TRPBF SSOP 28 E $4.45 
LTC3727LXEUH-1 QFN 32 E $6.57  $4.60 
LTC3727LXEUH-1#PBF QFN 32 E $6.57  $4.60 
LTC3727LXEUH-1#TR QFN 32 E $4.70 
LTC3727LXEUH-1#TRPBF QFN 32 E $4.70 
LTC3727 数据手册及相关资料下载
  1. 数据手册(英文) : LTC3727/LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators.PDF
  2. 可靠性数据 : R384 Reliability Data .PDF