ChipApex | Global Electronic Components Supplier
SEARCH
Search Product
Search Post
— IC芯片 | 连接器 | 传感器 | 被动器件 —
Consult the customer manager about the wholesale price.
consultation hotline：86-132-6715-2157
email：[email protected]
Contact the product manager for consultation. One-stop consultation is available.
Do you want a lower wholesale price? Please send us your inquiry and we will reply immediately.
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：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：-
Download product information
Overview
The LM5642XMHX is a high-voltage, dual synchronous buck converter controller manufactured by Texas Instruments. It operates with an input voltage range of 4.5 V to 36 V and supports output voltages from 1.236 V to 34 V. The device delivers up to 20 A per channel and features a fixed switching frequency of 200 kHz with a maximum duty cycle of 98%. It utilizes current mode control and includes oscillator synchronization capabilities. The component is housed in a 28-pin HTSSOP package and functions within a junction temperature range of -40°C to +125°C.
Feature Summary
- Dual-channel synchronous buck topology for independent power rail generation
- Oscillator synchronization capability for multi-phase or parallel system integration
- Current mode control architecture with integrated soft-start and enable functions
Applications
- High-voltage industrial power distribution systems
- Telecommunications infrastructure power supplies
- Server and storage backplane voltage regulation
Procurement Notes
Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and thermal performance characteristics. Ensure that the HTSSOP-28 package variant matches the intended PCB footprint and soldering profile requirements for the target assembly process.
Selection Notes
Select this component when designing systems requiring dual isolated outputs from a high-voltage input source. The 200 kHz frequency offers a balance between component size and efficiency. Consider the 28-pin HTSSOP package constraints for thermal management and layout density compared to alternative TSSOP variants.
Part Context
This part belongs to the LM5642X family of high-voltage controllers designed for robust power management applications. It serves as a core component in DC-DC conversion stages where high input voltage tolerance and precise dual-output regulation are required. The device integrates essential protection features and control logic to simplify external circuit design.
Replacement Considerations
LM5642XMT/NOPB: Same electrical specifications but in a TSSOP-28 package; verify pin-to-pin compatibility and thermal dissipation differences.
