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Product Detailed Parameters
- Description：78V WIDE-VIN BIDIRECTIONAL 4-SWI
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Buck-Boost
- Number of Outputs：1
- Output Phases：2
- Voltage - Supply (Vcc/Vdd)：2.9V ~ 78V
- Frequency - Switching：1.8MHz
- Duty Cycle (Max)：-
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Current Limit, Enable, Frequency Control, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：38-PowerTFSOP (0.173", 4.40mm Width)
- Supplier Device Package：38-HTSSOP
- Grade：-
- Qualification：-
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Overview
The LM51770DCPR is a non-isolated, bidirectional four-switch buck-boost controller from Texas Instruments. It supports an input voltage range of 2.9 V to 80 V and delivers an output voltage between 3.3 V and 78 V. Operating with a fixed switching frequency of 2 MHz, the device features synchronous rectification and integrated gate drivers with 12 ns rise and fall times. It functions within a junction temperature range of -40°C to +150°C and is housed in a 38-pin HTSSOP package.
Feature Summary
- Bidirectional power flow capability for seamless transition between buck and boost modes
- Integrated high-side and low-side gate drivers with fast switching characteristics
- Wide operating input voltage range supporting diverse battery and rail configurations
- Built-in protection mechanisms including overcurrent limiting and thermal shutdown
Applications
- Automotive lighting systems requiring wide input voltage tolerance
- Industrial motor drives utilizing bidirectional energy transfer
- Battery management systems in electric vehicles
- Point-of-load regulation in harsh environment electronics
Procurement Notes
Verify the specific suffix DCPR against the official datasheet to confirm the tape-and-reel packaging configuration. Ensure the component meets AEC-Q100 qualification requirements if deployed in automotive applications. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit products. Confirm that the HTSSOP-38 footprint matches your PCB layout constraints before finalizing procurement orders.
Selection Notes
Select this controller when designing systems requiring high-efficiency bidirectional power conversion with a wide input voltage span. The 2 MHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 38-pin HTSSOP package for its thermal performance and pin count relative to control complexity. Evaluate the need for external synchronization or phase shifting if multiple units operate in parallel.
Part Context
This component belongs to the LM51770-Q1 family of wide-input voltage buck-boost controllers designed for robust industrial and automotive environments. It complements other Texas Instruments power management solutions by providing flexible topology control without isolation barriers. The series targets applications demanding high reliability and efficient energy handling across varying load conditions.
Replacement Considerations
Direct substitutes include LM51770QDCPRQ1 for qualified automotive variants. Verify compatibility with LM517701DCPR regarding input voltage minimums and feature sets. Ensure any replacement maintains the same 38-pin HTSSOP footprint and electrical specifications.
