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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 28ETSSOP
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR)
- 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-PowerTSSOP (0.173", 4.40mm Width)
- Supplier Device Package：28-HTSSOP
- Grade：-
- Qualification：-
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Overview
The LM5642MHX/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 two independent outputs. The device features a fixed switching frequency of 200 kHz and delivers up to 20A per channel. Output voltages are adjustable from 1.3V to 32.4V, with a maximum duty cycle of 98.9%. It functions within a temperature range of -40°C to +125°C and is housed in a 28-HTSSOP package.
Feature Summary
- Integrates dual synchronous buck controllers for high-current applications
- Supports clock synchronization for multi-phase or parallel operation
- Includes built-in protection features such as current limiting and soft start
Applications
- High-density point-of-load power supplies
- Industrial equipment power distribution
- Telecommunications infrastructure
Procurement Notes
Verify the exact suffix against official documentation to confirm package type and tape/reel specifications. Ensure compatibility with thermal management requirements for the HTSSOP-28 package. Confirm RoHS compliance status through the manufacturer's latest datasheet before finalizing procurement orders.
Selection Notes
Select this component when designing systems requiring dual isolated or non-isolated buck conversions from a single input rail. Consider the 200 kHz switching frequency for balancing efficiency and passive component size. Evaluate thermal dissipation capabilities given the 20A output capability per channel in the specified package.
Part Context
This part belongs to the LM5642X family of high-voltage synchronous buck controllers. It is designed for applications needing robust power management in industrial and telecom environments. The device complements other PMIC solutions by offering integrated control logic for high-efficiency DC-DC conversion stages.
Replacement Considerations
LM5642MTC/NOPB offers similar electrical characteristics but utilizes a TSSOP-28 package instead of HTSSOP-28. Verify pinout compatibility and thermal performance differences before substitution.
