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Product Detailed Parameters
- Description：IC REG BUCK 3.42V 350MA 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)：40V
- Voltage - Output (Min/Fixed)：3.42V
- 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 LT3970EDDB-3.42#TRPBF is a monolithic buck switching regulator from Analog Devices Inc., designed for high-efficiency DC-to-DC conversion. It features an adjustable switching frequency ranging from 200 kHz to 2.2 MHz, allowing optimization for size and performance. The device supports a wide input voltage range up to 40V and delivers a continuous output current of 350mA. It incorporates a 2.5A Quick Cap charge pump to minimize external component count and reduce ripple. The part operates with a low quiescent current of 1.8µA and functions within a temperature range of -40°C to +125°C in a compact DFN-10 package.
Feature Summary
- Integrates a 2.5A Quick Cap charge pump to reduce input and output capacitance requirements while minimizing voltage ripple.
- Features an adjustable switching frequency range from 200kHz to 2.2MHz to optimize the trade-off between efficiency and passive component size.
- Supports a wide input voltage range up to 40V, accommodating various power supply sources including automotive and industrial rails.
- Provides ultra-low quiescent current consumption of 1.8µA to extend battery life in portable applications.
Applications
- Battery-powered portable instrumentation
- Automotive electronics systems
- Industrial control modules
- Distributed power architectures
Procurement Notes
Verify the specific suffix 'EDDB' indicates extended temperature or reliability grading compared to standard variants. Confirm the '#TRPBF' designation aligns with tape-and-reel packaging requirements for automated assembly. Ensure compatibility with the target PCB footprint for the DFN-10 package. Cross-reference the latest datasheet revision for any updates to thermal characteristics or pin definitions before finalizing procurement.
Selection Notes
Select this component when a wide input voltage range up to 40V is required alongside low standby current. The integrated Quick Cap feature makes it suitable for space-constrained designs needing reduced external capacitor counts. Choose this variant over adjustable versions when a fixed 3.42V output is desired. Consider the DFN-10 package dimensions against available board real estate and thermal dissipation needs.
Part Context
The LT3970 belongs to Analog Devices' family of micropower synchronous buck regulators. This series emphasizes high efficiency and low noise for sensitive analog loads. The EDDB suffix typically denotes an extended temperature grade or enhanced reliability specification within the product line. The DFN-10 package provides a compact solution with exposed pad thermal management.
Replacement Considerations
Direct substitutes include other LT3970 variants with different output voltages or packages, such as LT3970IDDB-3.3#TRMPBF, if voltage adjustment is permissible. Verify that alternative parts maintain the same 40V input rating and 350mA output capability. Check for compatibility with the existing Quick Cap architecture if minimizing external components is critical.
