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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 350MA 10MSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- 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-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Supplier Device Package：10-MSOP
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Overview
The LT3970IMS-3.3#PBF 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 200kHz to 2.64MHz, allowing optimization for size and efficiency. The device accepts a wide input voltage range of 4.2V to 40V and provides a fixed output voltage of 3.3V with a maximum output current of 350mA. It operates within a junction temperature range of -40°C to 125°C and is housed in a compact 10-MSOP package.
Feature Summary
- Integrates a high-voltage switch capable of handling input voltages up to 40V
- Offers adjustable switching frequency to optimize external component size and system efficiency
- Features ultra-low quiescent current consumption for extended battery life in portable applications
Applications
- Battery-powered portable equipment requiring low standby current
- Industrial control systems with wide input voltage ranges
- Distributed power supply architectures in telecommunications infrastructure
Procurement Notes
Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the IMS package variant matches your PCB footprint requirements. Ensure the fixed 3.3V output aligns with load specifications, as this part does not support adjustable output voltages unlike other LT3970 variants. Check manufacturer documentation for latest environmental declarations.
Selection Notes
Select this component when a fixed 3.3V output is required alongside a wide 40V input range. The fixed output version simplifies design by eliminating external feedback resistors compared to adjustable counterparts. Consider the 350mA current limit for load requirements. The MSOP package is suitable for space-constrained designs where thermal performance must be balanced with board area.
Part Context
This part belongs to the LT3970 family of high-voltage buck regulators. Unlike the adjustable output versions (e.g., LT3970IMS), the -3.3#PBF suffix denotes a fixed 3.3V output configuration. It shares core architecture with the series but offers simplified implementation for standard voltage rails. The family supports frequencies up to 2.64MHz for compact passive components.
Replacement Considerations
Direct substitutes include other LT3970 variants if adjustable output is acceptable, such as LT3970IMS#PBF. For fixed 3.3V needs, verify pin compatibility with other Analog Devices high-voltage buck converters. Cross-reference thermal characteristics and switching frequency ranges to ensure equivalent performance in existing designs.
