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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-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：28-TSSOP
- Grade：-
- Qualification：-
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Overview
The LM5642XMTX/NOPB 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 handles up to 20 A per channel and features a maximum duty cycle of 98.9%. It functions within a supply voltage range of 4.5 V to 36 V, consuming 1.1 mA of quiescent current. The component is housed in a 28-TSSOP package and withstands operating temperatures between -40°C and +125°C.
Feature Summary
- Dual-channel architecture for independent synchronous buck conversion
- Integrated clock synchronization capability for phase alignment
- Built-in protection mechanisms including over-current limiting and soft-start
Applications
- High-density point-of-load power distribution systems
- Industrial equipment requiring multi-rail power sequencing
- Telecommunications infrastructure power supplies
Procurement Notes
Verify the specific suffix 'X' indicates tape-and-reel packaging distinct from tube variants. Confirm RoHS compliance status through official documentation. Ensure ESD handling protocols are followed due to moisture sensitivity classification. Cross-reference the full part number against manufacturer databases to avoid confusion with non-NOPB versions or different package types like MH or TC.
Selection Notes
Select this controller when designing systems requiring two isolated or non-isolated buck outputs driven by a single IC. The 375 kHz frequency offers a balance between efficiency and passive component size. Consider the 28-TSSOP footprint for board space constraints. Evaluate thermal management requirements given the 20 A current capability per channel and the specified junction temperature range.
Part Context
This component belongs to the LM5642X family of power management integrated circuits. It serves as a switching controller rather than an integrated converter, requiring external MOSFETs and passive components. The NOPB suffix denotes lead-free and halogen-free construction compliant with environmental standards. It is categorized under DC-DC switching controllers within the broader PMIC portfolio.
Replacement Considerations
LM5642XMH/NOPB differs primarily in package type (HTSSOP-28) and switching frequency (200 kHz). LM5642MTC/NOPB uses a TSSOP-28 package but operates at 200 kHz. Verify pin compatibility and electrical specifications before substitution.
