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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 350MA 10DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：4.2V
- Voltage - Input (Max)：40V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Current - Output：350mA
- Frequency - Switching：200kHz ~ 2.25MHz
- 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 (3x2)
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Overview
The LT3970IDDB-3.3#TRMPBF is a monolithic buck switching regulator from Analog Devices, housed in a DFN-10 surface-mount package. It accepts input voltages up to 40V and provides a fixed 3.3V output at 350mA. The device features an adjustable switching frequency ranging from 200kHz to 2.2MHz and consumes only 2.5µA of quiescent current. It operates within a temperature range of -40°C to +125°C.
Feature Summary
- Integrates a high-efficiency power switch capable of delivering 350mA output current
- Features ultra-low quiescent current consumption for extended battery life
- Supports adjustable switching frequencies to optimize external component size
- Includes internal soft-start functionality to limit inrush current
Applications
- Battery-powered portable electronics requiring low standby current
- Industrial control systems with wide input voltage ranges
- Automotive infotainment and sensor interfaces
- Communication equipment power distribution networks
Procurement Notes
Verify the specific suffix #TRMPBF indicates tape and reel packaging configuration as per manufacturer documentation. Confirm RoHS compliance status through official Analog Devices declarations. Ensure the DFN-10 thermal pad soldering process aligns with recommended PCB layout guidelines for optimal heat dissipation and electrical performance.
Selection Notes
Select this component when a fixed 3.3V output is required alongside wide input voltage tolerance up to 40V. Consider the adjustable frequency range for balancing electromagnetic interference filtering requirements against passive component footprint constraints. Evaluate thermal performance in the DFN-10 package relative to the expected ambient operating conditions and load profile.
Part Context
This part belongs to the LT3970 family of high-voltage step-down converters designed for applications demanding low noise and high efficiency. The IDDB variant specifies the DFN-10 package type, while the -3.3 suffix denotes the fixed 3.3V output voltage option. The #TRMPBF designation confirms the specific shipping and lead-free manufacturing specifications provided by Analog Devices.
Replacement Considerations
Consult Analog Devices official cross-reference tools for verified pin-compatible or functionally equivalent alternatives. Verify that any substitute maintains the 40V maximum input rating and 350mA output capability. Ensure thermal characteristics and package dimensions match the existing design constraints before implementation.
