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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 28TSSOP
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- 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 LM5642XMT/NOPB is a high-voltage dual synchronous buck controller manufactured by Texas Instruments. It operates with an input voltage range of 4.5V to 36V and supports output voltages from 1.3V to 32.4V. The device delivers up to 20A per channel with a switching frequency of 375kHz. It features a maximum duty cycle of 98.9% and functions within a temperature range of -40°C to +125°C TJ. The IC is housed in a 28-TSSOP package.
Feature Summary
- Dual-channel architecture for independent synchronous buck regulation
- Integrated clock synchronization capability for noise reduction
- Built-in soft-start, current limiting, and enable control features
Applications
- High-voltage point-of-load conversion systems
- Industrial power distribution networks
- Telecommunications infrastructure power supplies
Procurement Notes
Verify the specific suffix against official documentation to confirm pinout and electrical characteristics. Ensure compatibility with required thermal management solutions for the TSSOP package. Confirm RoHS compliance status through manufacturer datasheets before integration into final assemblies.
Selection Notes
Select this component when designing dual-output high-voltage buck converters requiring precise current sharing. Consider the 375kHz switching frequency for balancing efficiency and passive component size. Evaluate thermal performance requirements given the operating junction temperature limits and package constraints.
Part Context
This part belongs to the LM5642X family of high-voltage synchronous buck controllers. It is designed for applications requiring robust power management in industrial and telecom environments. The device integrates essential protection features to ensure reliable operation under varying load conditions.
Replacement Considerations
LM5642XMH/NOPB offers identical electrical specifications but utilizes an HTSSOP-28 package instead of TSSOP. Verify footprint compatibility during substitution. LM5642MTC/NOPB provides similar functionality with a different package option.
