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Product Detailed Parameters
- Description：2.2-MHZ WIDE VIN 1.5-A MOSFET D
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Transistor Driver
- Function：Step-Up, Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Boost, Flyback, SEPIC
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：2.97V ~ 16V, 3.5V ~ 45V
- Frequency - Switching：100kHz ~ 2.2MHz
- Duty Cycle (Max)：93%
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Current Limit, Enable, Frequency Control, Power Good, Soft Start, Sync
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：12-WFDFN Exposed Pad
- Supplier Device Package：12-WSON (3x2)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The LM5155QUDSSTQ1 is an automotive-grade, non-synchronous boost controller from Texas Instruments, designed for wide input voltage applications. It operates within a 3.5 V to 45 V input range and supports switching frequencies up to 2.2 MHz. The device features a 1.5 A MOSFET driver and delivers up to 2 A output current. Packaged in a WSON-12 form factor, it complies with AEC-Q100 standards and functions reliably across temperatures from -40°C to +125°C.
Feature Summary
- Supports Boost, Flyback, and SEPIC topologies using peak current mode control
- Enables single-cell battery startup with low minimum operating voltage
- Includes integrated soft-start and clock synchronization capabilities
Applications
- Automotive traction inverter auxiliary power supplies
- LED lighting systems requiring isolated or non-isolated outputs
- Industrial power management modules
- PoE (Power over Ethernet) interface circuits
Procurement Notes
Verify the specific suffix 'UDSST' against the manufacturer's official datasheet to confirm package dimensions and tape-and-reel specifications. Ensure the component meets AEC-Q100 grade requirements for your target application environment. Cross-reference the ordering part number with authorized distributors to avoid counterfeit risks. Confirm RoHS compliance status prior to final procurement decisions.
Selection Notes
Select this controller when designing flyback or boost converters requiring high-frequency operation to minimize passive component size. The wide input voltage range suits applications with varying source conditions. Consider the 1.5 A driver strength for matching external MOSFET gate charge requirements. Evaluate thermal performance within the WSON-12 package for your specific PCB layout constraints.
Part Context
This component belongs to the LM5155 family of wide VIN controllers. It shares architectural similarities with other members like the LM51551 but offers specific packaging and automotive qualification variants. The series is optimized for cost-effective, compact power solutions in demanding environments.
Replacement Considerations
Check for LM5155QDSSRQ1 as a potential alternative with similar electrical characteristics. Verify pin compatibility and thermal performance before substitution. Consult official TI documentation for any functional differences between package variants.
