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STMicroelectronics L3751

Wide 6 V to 75 V input voltage synchronous buck controller

The 6 V to 75 V wide input voltage range L3751 synchronous buck controller features extreme voltage conversion ratio over switching frequency range (100 kHz - 1 MHz) thanks to 40 nsec minimum conduction time.

The diode emulation (DEM) implements 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 it is useful to implement output voltage sequencing for digital ICs.

Key features

Wide 6 V to 75 V input voltage range
Adjustable output voltage from 0.8 V to 60 V
100 kHz - 1 MHz switching frequency range
40 nsec minimum on-time for extreme duty ratio

Additional features

Wide 6 V to 75 V input voltage range
Adjustable output voltage from 0.8 V to 60 V
100 kHz - 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

Applications

Telecom, networking, server power
Industrial and robotics
E-bikes
Battery voltage conversion

Available tools

STEVAL-L3751V12: 75 V 15 A DC-DC converter buck regulator evaluation board with L3751 controller
STSW-eDSim: eDSim: fast and powerful electrical simulation software for SMPS and analog ICs