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Product Detailed Parameters
- Description：IC REG BUCK BST ADJ 2.5A DDPAK-5
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration：Positive or Negative
- Topology：Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3V
- Voltage - Input (Max)：40V
- Voltage - Output (Min/Fixed)：1.244V
- Voltage - Output (Max)：65V (Switch)
- Current - Output：2.5A (Switch)
- Frequency - Switching：100kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 100°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Supplier Device Package：DDPAK-5
- Grade：-
- Qualification：-
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Overview
The LT1171IQ#PBF is a monolithic high-power switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3V to 40V and provides a maximum output current of 2.5A, supporting up to 100W of output power. The device integrates a high-current, high-efficiency switch along with all necessary oscillator, control, and protection circuitry on the die. It supports multiple standard switching configurations including buck, boost, flyback, forward, inverting, and Cuk topologies. The adjustable output voltage ranges from 1.244V to 65V (switch). It functions at a fixed switching frequency of 100kHz and operates within a junction temperature range of -40°C to +100°C.
Feature Summary
- Integrates a high-current, high-efficiency power switch with complete oscillator, control, and protection circuitry on a single die.
- Supports versatile operation across all standard switching configurations, including buck, boost, flyback, forward, inverting, and Cuk topologies.
- Provides adjustable output voltage capability with positive or negative output configurations.
Applications
- Driving high voltage FETs for off-line applications
- Negative boost regulators
- Positive-to-negative buck-boost converters
- Boost converters
Procurement Notes
Verify the specific suffix #PBF indicates lead-free compliance when ordering. Confirm the DDPAK-5 package availability matches your PCB footprint requirements. Check the latest datasheet revision for any updates to electrical characteristics or thermal performance data before finalizing the design.
Selection Notes
Select this component for designs requiring a robust, integrated solution for high-power DC-DC conversion without external driver complexity. The 2.5A current rating suits moderate power levels up to 100W. Ensure the chosen topology aligns with the required input and output voltage constraints defined in the specifications.
Part Context
This part belongs to the LT1170/LT1171 family of high-power switching regulators. While similar to the LT1170, which offers higher current capabilities, the LT1171 is specifically rated for 2.5A output. Both share the same operational principles and supported topologies but differ in peak current handling and specific application suitability.
Replacement Considerations
LT1170IQ#PBF serves as a higher-current alternative within the same family. Verify if the increased current capacity of the LT1170 is necessary or if the 2.5A limit of the LT1171 is sufficient for the load requirements.
