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UCD74120

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14 V, 25 A synchronous buck power stage with output current monitoring

Product details

Supply voltage (min) (V) 4.7 Supply voltage (max) (V) 14 Number of outputs 1 Peak output current (A) 25 Input threshold CMOS Propagation delay time (µs) 0.085 Driver configuration Single Operating temperature range (°C) -40 to 125 Rating Catalog
Supply voltage (min) (V) 4.7 Supply voltage (max) (V) 14 Number of outputs 1 Peak output current (A) 25 Input threshold CMOS Propagation delay time (µs) 0.085 Driver configuration Single Operating temperature range (°C) -40 to 125 Rating Catalog
LQFN-CLIP (RVF) 40 35 mm² 7 x 5
  • Integrates Synchronous Buck Driver and NexFET™ Power MOSFETS for High Power Density and High Efficiency
  • 25-A Output Current Capability for DSP and ASIC
  • 4.7-V to 14-V Input Voltage Range
  • Operational up to 2 MHz Switching Frequency
  • Built-In High-Side Current Protection
  • DCR Current Sensing for Overcurrent Protection and Output Current Monitoring
  • Voltage Proportional to Load Current Monitor Output
  • Tri-state PWM Input for Power Stage Shutdown
  • UVLO Housekeeping Circuit
  • Integrated Thermal Shutdown
  • 40-Pin, 5 mm x 7 mm, PQFN PowerStack™ Package
  • Integrates Synchronous Buck Driver and NexFET™ Power MOSFETS for High Power Density and High Efficiency
  • 25-A Output Current Capability for DSP and ASIC
  • 4.7-V to 14-V Input Voltage Range
  • Operational up to 2 MHz Switching Frequency
  • Built-In High-Side Current Protection
  • DCR Current Sensing for Overcurrent Protection and Output Current Monitoring
  • Voltage Proportional to Load Current Monitor Output
  • Tri-state PWM Input for Power Stage Shutdown
  • UVLO Housekeeping Circuit
  • Integrated Thermal Shutdown
  • 40-Pin, 5 mm x 7 mm, PQFN PowerStack™ Package

UCD74120 is a multi-chip module integrating a driver device and two NexFET power MOSFETs into a thermally enhanced compact, 5 mm × 7 mm, QFN package. A 25-A output current capability makes the device suitable for powering DSP and ASIC. The device is designed to complement digital or analog PWM controllers. The PWM input of the driver device is 3-state compatible. Two driver circuits provide high charge and discharge current for the high-side N-channel FET switch and the low-side N-channel FET synchronous rectifier in a synchronous buck converter.

Output current is measured and monitored by a precision current sensing amplifier that processes the voltage present across an external current sense element. The amplified signal is available for use by the PWM controller on the IMON pin. On-board comparators monitor the voltage across the high-side switch and the voltage across the external current sense element to safeguard the power stage from sudden high-current loads. Blanking delay is set for the high-side comparator by a single resistor in order to avoid false reports coincident with switching edge noise. In the even of a high-side fault or an overcurrent fault, the high-side FET is turned off and the fault flag (FLT) is asserted to alert the PWM controller.

UCD74120 is a multi-chip module integrating a driver device and two NexFET power MOSFETs into a thermally enhanced compact, 5 mm × 7 mm, QFN package. A 25-A output current capability makes the device suitable for powering DSP and ASIC. The device is designed to complement digital or analog PWM controllers. The PWM input of the driver device is 3-state compatible. Two driver circuits provide high charge and discharge current for the high-side N-channel FET switch and the low-side N-channel FET synchronous rectifier in a synchronous buck converter.

Output current is measured and monitored by a precision current sensing amplifier that processes the voltage present across an external current sense element. The amplified signal is available for use by the PWM controller on the IMON pin. On-board comparators monitor the voltage across the high-side switch and the voltage across the external current sense element to safeguard the power stage from sudden high-current loads. Blanking delay is set for the high-side comparator by a single resistor in order to avoid false reports coincident with switching edge noise. In the even of a high-side fault or an overcurrent fault, the high-side FET is turned off and the fault flag (FLT) is asserted to alert the PWM controller.

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Technical documentation

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* Data sheet High-Current, Synchronous Buck Power Stage datasheet 23 Dec 2011
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note UCD74120 Power Sequence Requirement 26 Oct 2015

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Reference designs

PMP11196 — Reference Design for 12Vin, Two Phase Synchronous Buck Converter 1V 50A with PMBus Control

Fixed frequency voltage mode control is used for CPU, Memory and ASIC applications where a predictable frequency and/or synchronization to an external clock is needed.  Two high current synchronous power stages provide the high currents and low losses needed for these applications. Multi-phase (...)
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LQFN-CLIP (RVF) 40 View options

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