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Product Detailed Parameters
- Description：LM5642X HIGH VOLTAGE, DUAL SYNCH
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Type：Transistor Driver
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Number of Outputs：2
- Output Phases：2
- Voltage - Supply (Vcc/Vdd)：4.5V ~ 36V
- Frequency - Switching：375kHz
- Duty Cycle (Max)：98.90%
- Synchronous Rectifier：Yes
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Current Limit, Enable, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：28-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：28-TSSOP
- Grade：-
- Qualification：-
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Overview
The LM5642XMTX/NOPB is a high-voltage dual synchronous buck controller manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It operates with a fixed switching frequency of 375 kHz and supports an input voltage range of 4.5 V to 36 V. The device provides two independent output channels, each capable of delivering up to 20 A. It features a maximum duty cycle of 98.9% and includes clock synchronization capabilities. The component functions within a junction temperature range of -40°C to +125°C and is housed in a 28-TSSOP package.
Feature Summary
- Dual synchronous buck topology for high-current applications
- Integrated oscillator synchronization for multi-phase systems
- Built-in protection including current limiting and soft-start
Applications
- High voltage dual synchronous buck converter designs
- Industrial power supply systems
- Telecommunications infrastructure equipment
Procurement Notes
Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the specific suffix 'NOPB' indicates lead-free and RoHS compliance. Ensure the package type matches the required 28-TSSOP footprint for PCB layout compatibility. Cross-reference the datasheet revision to confirm electrical characteristics align with current design requirements.
Selection Notes
Select this controller for applications requiring high input voltages up to 36 V and significant output current capacity. The fixed 375 kHz frequency allows for optimized passive component sizing. Consider the thermal performance within the specified operating temperature range. Evaluate the need for external synchronization signals if multiple units are deployed in close proximity to prevent interference.
Part Context
This component belongs to the LM5642X series of power management integrated circuits. It is designed as a switching controller for DC-DC conversion. The part is classified under PMIC (Power Management ICs) and specifically falls within the category of DC DC Switching Controllers. It serves as a core control element in step-down power architectures.
Replacement Considerations
The LM5642XMH/NOPB is a documented alternative variant within the same family, differing primarily in packaging configuration while maintaining identical electrical specifications.
