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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-PowerTSSOP (0.173", 4.40mm Width)
- Supplier Device Package：28-HTSSOP
- Grade：-
- Qualification：-
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Overview
The LM5642XMH/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 features a fixed switching frequency of 200 kHz and delivers up to 20A per channel. It includes integrated soft-start, current limit, and enable functions. The component operates within a temperature range of -40°C to +125°C and is housed in a 28-HTSSOP package.
Feature Summary
- Dual-channel synchronous buck control architecture for high-current applications
- Integrated clock synchronization capability for multi-phase or parallel operation
- Comprehensive protection features including over-current limiting and thermal shutdown
Applications
- High-density point-of-load (POL) power supplies
- Industrial automation power distribution systems
- Telecommunications infrastructure equipment
Procurement Notes
Verify the specific suffix 'X' against the official datasheet to confirm pinout and functional compatibility, as packaging variations may exist. Ensure the HTSSOP-28 footprint matches the target PCB design. Confirm RoHS compliance status through the manufacturer's latest documentation before finalizing procurement orders.
Selection Notes
Select this component when designing dual-output DC/DC converters requiring high efficiency and compact size. The 200 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 28-pin package constraints for thermal management and layout space. Evaluate the need for external compensation networks based on the specific load transient requirements.
Part Context
This part belongs to the LM5642X family of high-voltage synchronous buck controllers. It shares core functionality with variants like LM5642MTC/NOPB but differs in package type. The 'X' designation typically indicates a specific tape-and-reel or tube configuration variant within the broader product line, designed for automated surface-mount assembly processes.
Replacement Considerations
LM5642MTC/NOPB offers identical electrical performance in a TSSOP-28 package. LM5642XMTX/NOPB provides the same functionality in a tape-and-reel format. Verify pin-to-pin compatibility and thermal characteristics when substituting between these package variants.
