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Product Detailed Parameters
- Description：HIGH VOLTAGE 1.5A, 500KHZ STEP-D
- Series：*
- Mfr：Linear Technology
- Package：Bulk
- Function：-
- Output Configuration：-
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- Number of Outputs：-
- Voltage - Input (Min)：-
- Voltage - Input (Max)：-
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- Voltage - Output (Max)：-
- Current - Output：-
- Frequency - Switching：-
- Synchronous Rectifier：-
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Overview
The LT1977EFE#3FMPBF is a high voltage step-down switching regulator manufactured by Linear Technology. It features a 1.5A output current capability and operates at a fixed 500kHz frequency. The device utilizes a 16-pin TSSOP package. Key electrical specifications include a maximum input voltage of 60V, an input voltage range of 4V to 60V, and a minimum start-up voltage of 7.5V. It offers a low quiescent current of 100µA. The controller supports adjustable output voltages up to 36V and includes onboard regulation for biasing simplification.
Feature Summary
- High voltage operation with wide input range
- Fixed 500kHz switching frequency
- Low quiescent current consumption
- Onboard biasing regulator
Applications
- Medium to high power supplies
- High efficiency DC-DC conversion systems
- Industrial control power distribution
Procurement Notes
Verify the specific suffix #3FM indicates tape and reel packaging configuration distinct from standard bulk or tube options. Confirm RoHS compliance status matches project requirements. Ensure the 16-pin TSSOP footprint aligns with PCB layout constraints. Validate that the 60V maximum rating suits the target application's transient conditions.
Selection Notes
Select this component for applications requiring high input voltage tolerance and fixed frequency operation. The 1.5A current limit defines the maximum load capacity. Consider the 500kHz frequency for inductor size trade-offs. The onboard regulator reduces external component count for bias supply generation compared to controllers lacking this feature.
Part Context
This part belongs to the Linear Technology high voltage step-down regulator family. It serves as a complete switching solution rather than just a controller, integrating the driver stage. The 16-pin TSSOP package provides thermal performance suitable for medium power densities. It complements lower voltage regulators in mixed-voltage system designs.
Replacement Considerations
Direct substitutes within the same manufacturer line may offer different current ratings or frequencies. Verify pin compatibility when considering cross-model replacements. Check if alternative parts support the required 60V input range. Ensure thermal characteristics match the original design constraints.
