1FEATURES
2• Integrates Synchronous Buck Driver and
NexFET™ Power MOSFET Technology for
High Power Density and High Efficiency
• 15-A Output Current Capability for DSP and
ASIC
• 4.7-V to 14-V Input Voltage Range
• Operational Switching Frequency Up to 2 MHz
• 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

APPLICATIONS
• Digital or Analog POL Power Modules
• High Power Density DC-DC Converters for
Telecom and Networking Applications

DESCRIPTION
UCD74111 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 15-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.
A precision current sensing amplifier that processes
the voltage present across an external current sense
element measures and monitors the output current.
The PWM controller on the IMON pin can use this
amplified signal. 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. A single resistor for the high-side comparator
sets the blanking delay. This delay guards against
false reports coincident with switching edge noise. In
the event of a high-side fault or an overcurrent fault,
the high-side FET turns OFF and the fault flag (FLT)
asserts to alert the PWM controller.