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Product Detailed Parameters
- Description：LM5642 4.5-36V, CURRENT MODE DUA
- 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：200kHz
- 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 LM5642MTCX/NOPB is a high-voltage, dual synchronous buck converter controller manufactured by Texas Instruments. It operates with a switching frequency of 200 kHz and supports a maximum duty cycle of 98.9%. The device provides two output channels, each capable of delivering up to 20 A of output current. Output voltage regulation ranges from 1.3 V to 32.4 V. The supply voltage range is specified between 4.5 V and 36 V. The component functions within an operating temperature range of -40°C to +125°C and is housed in a TSSOP-28 package.
Feature Summary
- Integrates dual synchronous rectification for high-efficiency power conversion
- Supports oscillator synchronization for multi-phase or parallel applications
- Features adjustable switching frequency and wide input voltage capability
Applications
- High voltage dual synchronous buck converter systems
- Industrial power management modules
- Telecommunications infrastructure power supplies
Procurement Notes
Verify the manufacturer designation carefully, as the part was originally developed by National Semiconductor but is now produced and distributed by Texas Instruments. Confirm the specific suffix 'NOPB' indicates lead-free and RoHS compliance status according to the latest datasheet revision. Ensure the TSSOP-28 package variant matches your PCB footprint requirements before ordering.
Selection Notes
Select this component when designing high-voltage step-down converters requiring dual independent outputs. The 200 kHz switching frequency offers a balance between efficiency and passive component size. Consider the thermal performance of the TSSOP-28 package for your specific current load conditions. Verify that the input voltage range of 4.5 V to 36 V aligns with your system's power rail specifications.
Part Context
This component belongs to the LM5642 family of high-voltage dual synchronous buck controllers. While originally associated with National Semiconductor, the product line is currently managed by Texas Instruments following their acquisition. The device is categorized under PMIC - Power Management ICs and Switching Controllers, designed for robust industrial and communication applications requiring reliable voltage regulation.
Replacement Considerations
The LM5642MTC/NOPB (tube packaging) serves as a direct functional equivalent with identical electrical characteristics but different packaging. Other variants such as LM5642XMH/NOPB offer similar performance in an HTSSOP-28 package. Verify pin compatibility and thermal dissipation requirements when substituting across package types.
