STMicroelectronics

L3751 Synchronous Buck Controller

STMicroelectronics' synchronous buck controller features extreme voltage conversion ratio

Image of STMicroelectronics L3751 Synchronous Buck ControllerSTMicroelectronics' 6 V to 75 V wide input voltage range L3751 synchronous buck controller features an extreme voltage conversion ratio over switching frequency range (100 kHz to 1 MHz) due to 40 nsec minimum conduction time.

The diode emulation (DEM) implements a pulse skipping mode that maximizes the efficiency at light-load, giving controlled output voltage ripple. The forced PWM (FPWM) over the load range makes the switching frequency constant and minimizes the output voltage ripple.

The Power Good open collector output validates the regulated output voltage for monitoring and is useful for implementing output voltage sequencing for digital ICs during the power-up phase. An embedded gate driver minimizes the number of external components and is designed for standard VTH MOSFET.

Embedded protections – output overcurrent, input voltage UVLO, internal voltage monitoring, and thermal shutdown – feature controlled and safe operation for critical environments in telecom, networking, and industrial applications. The device is available in a QFN 20 leads 3.5 mm x 4.5 mm package with wettable flanks.

Features
  • Wide 6 V to 75 V input voltage range
  • Adjustable output voltage from 0.8 V to 60 V
  • 100 kHz to 1 MHz switching frequency range
  • 40 nsec minimum on-time for extreme duty ratio
  • Low dropout operation during line transient
  • Adjustable soft-start or input voltage tracking
  • Pulse skipping or forced PWM operation at light load
  • Synchronization
  • Adjustable precision enable
  • Power Good open collector output validates VOUT
  • 7.5 V gate drivers for standard VTH MOSFETs
  • Constant current protection with hiccup mode
  • Precision or lossless programmable current sensing
  • Improved line transient response
  • Input voltage undervoltage lockout
  • Internal voltage monitoring
  • Thermal protection
  • Operating junction temperature range: -40°C to +150°C

L3751 Synchronous Buck Controller

ImageManufacturer Part NumberDescriptionAvailable QuantityPriceView Details
WIDE 6 V TO 75 V INPUT VOLTAGE SL3751PURWIDE 6 V TO 75 V INPUT VOLTAGE S941 - Immediate$2.14View Details
EVAL BOARD FOR L3751STEVAL-L3751V12EVAL BOARD FOR L375112 - Immediate$59.10View Details
Published: 2022-10-07