UCD74120RVFT集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

UCD74120RVFT属于集成电路（IC）的稳压器-DC-DC开关稳压器。由德州仪器制造生产的UCD74120RVFT稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。

1 FEATURES

1• 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

2 APPLICATIONS

• Digital or Analog POL Power Modules

• High Power Density DC-DC Converters for

Telecom and Networking Applications

3 DESCRIPTION

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 Nchannel

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.