UCD74111RVFTG4中文资料德州仪器数据手册PDF规格书

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.