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Product Detailed Parameters
- Description：PROTOTYPE
- Series：-
- Mfr：Texas Instruments
- Package：Bulk
- 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)：3.5V ~ 60V
- 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
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：12-WFDFN Exposed Pad
- Supplier Device Package：12-WSON (3x2)
- Grade：-
- Qualification：-
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Overview
The LM51561QDSSTQ1 is an automotive-grade, non-synchronous boost, flyback, and SEPIC switching controller from Texas Instruments. It features a wide input voltage range of 2.97 V to 60 V and supports adjustable switching frequencies from 100 kHz to 2.2 MHz. The device provides a 1.5 A MOSFET driver and operates within a junction temperature range of -40°C to +125°C. It includes integrated protection features such as cycle-by-cycle current limiting, soft start, and power good indication.
Feature Summary
- Supports Boost, Flyback, and SEPIC topologies for versatile power conversion applications
- Wide input voltage range accommodating single-cell battery startup and high-voltage inputs
- Integrated 1.5 A gate driver for efficient external MOSFET control
- Automotive qualification compliant with AEC-Q100 standards
Applications
- Automotive lighting systems requiring isolated or non-isolated DC-DC conversion
- Battery-powered automotive modules utilizing single-cell lithium-ion sources
- Industrial control interfaces needing wide input voltage tolerance
- General-purpose automotive power distribution networks
Procurement Notes
Verify the specific suffix 'QDSSTQ1' against official Texas Instruments documentation to confirm package type (WSON-12) and automotive grade status. Ensure compatibility with required thermal management solutions for the WSON-12 footprint. Cross-reference the datasheet revision history for any pinout or electrical parameter updates prior to finalizing procurement orders.
Selection Notes
Select this component when designing circuits requiring support for multiple topologies including flyback and SEPIC alongside standard boost configurations. The wide input range makes it suitable for applications where input voltage varies significantly, such as cold crank scenarios in automotive environments. Consider the 1.5 A drive capability when sizing external MOSFETs for higher load currents.
Part Context
This part belongs to the LM5156x family of wide VIN non-synchronous controllers designed for automotive applications. It shares functional similarities with the LM51551 but offers a wider input voltage range up to 60 V. The Q1 suffix indicates automotive qualification, ensuring reliability under harsh operating conditions defined by AEC-Q100 standards.
Replacement Considerations
LM51551QDSSTQ1: Similar topology support but lower maximum input voltage rating. LM51561DSSR: Non-automotive grade version with identical electrical specifications but lacking AEC-Q100 certification.
