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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 28TSSOP
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR)
- 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 is a high-voltage dual synchronous buck controller manufactured by Texas Instruments. It operates with a fixed switching frequency of 375 kHz and supports output voltages ranging from 1.3 V to 32.4 V. The device delivers up to 20 A per channel and functions within an operating temperature range of -40°C to +125°C. It utilizes a 28-TSSOP package and draws 1.1 mA in quiescent current. Key electrical parameters include a maximum duty cycle of 98.9% and a supply voltage range of 4.5 V to 36 V.
Feature Summary
- Dual-channel architecture supporting independent or interleaved synchronous buck conversion
- Integrated clock synchronization capability for noise reduction and phase alignment
- Built-in protection features including overcurrent limiting, enable control, and soft-start functionality
Applications
- High-voltage industrial power distribution systems
- Telecommunications infrastructure power supplies
- Server and storage backplane voltage regulation
Procurement Notes
Verify the specific suffix (e.g., NOPB) to confirm RoHS compliance and lead-free status. Confirm the package type matches the design requirements, as variants like LM5642MTC/NOPB use different packaging. Check humidity sensitivity levels and reflow soldering profiles against assembly specifications. Ensure the ordering quantity aligns with reel or cut-tape availability constraints defined by the manufacturer.
Selection Notes
Select this component when a dual-output solution is required for high-voltage input applications. The 375 kHz frequency offers a balance between efficiency and component size. Consider alternative packages such as HTSSOP-28 if thermal performance or pin compatibility differs. Verify that the 20 A current rating meets the load requirements for both channels simultaneously.
Part Context
This part belongs to the LM5642X family of high-voltage synchronous buck controllers. It is designed for applications requiring efficient power conversion from higher voltage rails. The series includes variants with different switching frequencies and package options to suit diverse board space and thermal constraints.
Replacement Considerations
LM5642XMT/NOPB is a tube-packaged variant of the same functional device. LM5642MTC/NOPB offers a similar specification set but may differ in package dimensions or thermal characteristics.
