UCD74120 Series
14 V, 25 A synchronous buck power stage with output current monitoring
Manufacturer: Texas Instruments
Catalog(1 parts)
| Part | Number of Outputs▲▼ | Synchronous Rectifier▲▼ | Voltage - Input (Max)▲▼ | Frequency - Switching▲▼ | Function | Output Configuration | Mounting Type | Topology | Voltage - Input (Min)▲▼ | Current - Output▲▼ | Package / Case | Operating Temperature▲▼ | Operating Temperature▲▼ | Supplier Device Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 ul | 14 V | 2000000 Hz | Step-Down | Positive | Surface Mount | Buck | 4.699999809265137 V | 25 A | 40-PowerLFQFN | 125 °C | -40 °C | 40-LQFN-CLIP (7x5) |
Key Features
• Integrates Synchronous Buck Driver and NexFET™ Power MOSFETS for High Power Density and High Efficiency25-A Output Current Capability for DSP and ASIC4.7-V to 14-V Input Voltage RangeOperational up to 2 MHz Switching FrequencyBuilt-In High-Side Current ProtectionDCR Current Sensing for Overcurrent Protection and Output Current MonitoringVoltage Proportional to Load Current Monitor OutputTri-state PWM Input for Power Stage ShutdownUVLO Housekeeping CircuitIntegrated Thermal Shutdown40-Pin, 5 mm x 7 mm, PQFN PowerStack™ PackageIntegrates Synchronous Buck Driver and NexFET™ Power MOSFETS for High Power Density and High Efficiency25-A Output Current Capability for DSP and ASIC4.7-V to 14-V Input Voltage RangeOperational up to 2 MHz Switching FrequencyBuilt-In High-Side Current ProtectionDCR Current Sensing for Overcurrent Protection and Output Current MonitoringVoltage Proportional to Load Current Monitor OutputTri-state PWM Input for Power Stage ShutdownUVLO Housekeeping CircuitIntegrated Thermal Shutdown40-Pin, 5 mm x 7 mm, PQFN PowerStack™ Package
Description
AI
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.