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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 28TSSOP
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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 LM5642XMHX/NOPB is a high-voltage dual synchronous buck controller manufactured by Texas Instruments. It operates with a fixed switching frequency of 200 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 an HTSSOP-28 package for surface mount installation.
Feature Summary
- Dual-channel architecture designed for high-current synchronous buck applications
- Integrated clock synchronization capability for multi-phase or parallel system expansion
- Comprehensive protection features including overcurrent limiting, enable control, and soft-start functionality
Applications
- High-density point-of-load power distribution systems
- Industrial equipment requiring robust voltage regulation
- Telecommunications infrastructure power supplies
- Automotive electronics demanding wide input voltage ranges
Procurement Notes
Verify the specific suffix against official documentation to confirm package type and tape/reel specifications. Ensure compatibility with required thermal management solutions given the HTSSOP-28 form factor. Confirm RoHS compliance status through current manufacturer declarations prior to integration into final assemblies.
Selection Notes
Select this component when designing systems requiring independent dual outputs with high current capacity. Consider the 200 kHz fixed frequency for balancing efficiency and component size. Evaluate the 32.4 V maximum output limit against load requirements. Assess the need for external synchronization signals if multiple units operate in proximity.
Part Context
This part belongs to the LM5642X series of power management integrated circuits. It serves as a specialized switching controller within Texas Instruments' portfolio for high-voltage DC-DC conversion. The device complements other regulators by providing precise control over dual synchronous buck stages without integrating the power switches themselves.
Replacement Considerations
LM5642XMTX/NOPB offers identical electrical performance but uses a TSSOP-28 package with reel/cut-tape packaging instead of tube.
