Product overview
Description
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 ns 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 during the power-up phase.
An embedded gate driver minimizes the number of external components and it is designed for standard VTH MOSFET.
Embedded protections–output overcurrent, input voltage UVLO, internal voltage monitoring, 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 x 4.5 mm package with wettable flanks.
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All 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 ns 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
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STMicroelectronics - L3751
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All resources
| Resource title | Version | Latest update | Actions | Details | Download |
|---|
SIMPLIS models (1)
| Resource title | Version | Latest update | Actions | Options | ||
|---|---|---|---|---|---|---|
| ZIP | 2026.04 | 21 May 2026 | 21 May 2026 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| L3751PUR | Active Product is in volume production. | QFN 3.5X4.5X1.0 20L PITCH 0.50 | Industrial | Ecopack2 | 10 | 2023-06-06T00:00:00.000+02:00 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L3751PUR | | | distributors No availability of distributors reported, please contact our sales office |
L3751PUR Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors