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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：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 LM5642MTC/NOPB is a high-voltage dual synchronous buck controller manufactured by Texas Instruments. It features two independent output channels with a maximum output current of 20 A per channel. The device operates at a fixed switching frequency of 200 kHz and supports a maximum duty cycle of 98.9%. Output voltage regulation ranges from 1.3 V to 32.4 V. It functions within an operating temperature range of -40°C to +125°C. The component is housed in a TSSOP-28 package and draws a typical quiescent supply current of 1.1 mA.
Feature Summary
- Dual-channel architecture supporting independent synchronous buck conversion
- Integrated clock synchronization capability for phase alignment
- Built-in protection mechanisms including over-current limiting and soft-start
- High efficiency operation via integrated synchronous rectification
Applications
- Industrial power distribution systems
- Telecommunications infrastructure equipment
- Point-of-load (POL) converter designs
- Automotive electronics power management
Procurement Notes
Verify the specific suffix 'MTC' corresponds to the TSSOP-28 tube packaging variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation. Ensure compatibility with required humidity sensitivity levels for surface mount assembly processes. Cross-reference the full part number against distributor catalogs to avoid confusion with tape-and-reel variants.
Selection Notes
Select this controller for applications requiring dual isolated or non-isolated outputs from a single input source. The 200 kHz frequency offers a balance between component size and efficiency. Consider the TSSOP-28 thermal performance for your PCB layout. Evaluate the need for external synchronization if multiple converters operate in proximity.
Part Context
This component belongs to the LM5642 family of high-voltage dual synchronous buck controllers. It shares core functional specifications with other variants like the LM5642XMTX, differing primarily in packaging and shipping configuration. The MTC designation specifically identifies the tube-packaged version suitable for automated pick-and-place assembly in high-volume manufacturing environments.
Replacement Considerations
LM5642XMTX/NOPB: Identical electrical specifications; differs only in tape-and-reel packaging. LM5642MH/NOPB: Similar functionality but utilizes HTSSOP-28 packaging with different pin-out dimensions.
