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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 750MA 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：4.2V
- Voltage - Input (Max)：42V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：750mA
- Frequency - Switching：195kHz ~ 2.15MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：10-WFDFN Exposed Pad
- Supplier Device Package：10-DFN (3x3)
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Overview
The LT3973IDD-3.3#TRPBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., housed in a 10-WFDFN exposed pad package. It features an adjustable switching frequency ranging from 195 kHz to 2.15 MHz and accepts input voltages up to 42 V. The device delivers a maximum output current of 750 mA with a minimum fixed output voltage of 1.21 V, while the specific IDD-3.3 variant provides a fixed 3.3 V output. It operates within a junction temperature range of -40°C to 125°C and consumes only 2.5 µA of quiescent current.
Feature Summary
- Adjustable switching frequency allows optimization for efficiency or component size
- Wide input voltage range supports operation from standard battery sources to high-voltage rails
- Ultra-low quiescent current minimizes power consumption during standby modes
Applications
- Automotive electronics systems requiring robust voltage regulation
- Industrial control equipment operating under wide input variations
- Portable devices utilizing single-cell lithium-ion battery inputs
Procurement Notes
Verify the suffix #TRPBF confirms tape-and-reel packaging for automated assembly. Confirm the IDD designation indicates the industrial temperature grade (-40°C to 125°C TJ). Ensure the -3.3 suffix matches the required fixed output voltage for the target circuit design before finalizing orders.
Selection Notes
Select this component when a fixed 3.3 V rail is needed with high input voltage tolerance. The adjustable frequency feature permits trade-offs between external inductor size and electromagnetic interference. Verify that the 750 mA output current meets the load requirements without exceeding thermal limits in the chosen enclosure.
Part Context
This part belongs to the LT3973 family of synchronous step-down converters designed for high-input voltage applications. The IDD variant specifies the industrial temperature rating, distinguishing it from military or extended grades. The TRPBF suffix denotes the specific reel packaging format used for surface-mount technology placement.
Replacement Considerations
Direct pin-compatible substitutes within the same family include other LT3973 variants with different temperature ratings or output configurations. Cross-reference datasheets to ensure equivalent switching frequency ranges and thermal performance characteristics match the original design constraints.
