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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 350MA 10MSOP
- 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-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Supplier Device Package：10-MSOP
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Overview
The LT3970IMS-3.3#TRPBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., designed for high-efficiency DC-to-DC conversion in space-constrained applications. It features an adjustable switching frequency ranging from 200 kHz to 2.25 MHz, allowing optimization for size and performance. The device accepts a wide input voltage range from 4.2 V to 40 V and delivers a maximum output current of 350 mA. Output voltage is adjustable from 1.21 V to 25 V using external resistors. It operates with a low quiescent current of 2.5 µA and functions within a junction temperature range of -40°C to +125°C.
Feature Summary
- Adjustable switching frequency allows trade-off between efficiency and passive component size
- Wide input voltage range supports diverse power supply architectures
- Ultra-low quiescent current enables extended battery life in portable devices
- Integrated soft-start limits inrush current during startup
Applications
- Battery-powered portable instrumentation
- Industrial control systems with wide input ranges
- Automotive electronics requiring robust voltage regulation
- Point-of-load conversion in communication equipment
Procurement Notes
Verify the suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm the IMS package variant matches your PCB footprint requirements. Check for RoHS compliance status as per the latest datasheet revision. Ensure availability through authorized distributors due to potential supply constraints. Validate that the 3.3 suffix denotes the specific internal reference or configuration if applicable to your design.
Selection Notes
Select this component when a compact solution is needed for converting higher voltages down to lower levels with minimal standby power consumption. The adjustable frequency feature is critical for optimizing electromagnetic interference (EMI) profiles. Consider the thermal performance of the MSOP package under full load conditions. Ensure the external feedback resistor values are calculated accurately to set the desired output voltage within the specified range.
Part Context
This part belongs to the LT3970 family of synchronous buck regulators, known for their high efficiency and small footprint. The IMS package variant offers a surface-mount solution suitable for automated assembly processes. It is designed to replace older linear regulators in applications where heat dissipation and efficiency are primary concerns. The family supports various output configurations and frequencies to meet diverse system requirements.
Replacement Considerations
Direct substitutes include other LT3970 variants with different packages or frequency settings, such as LT3970IDDB or LT3970HMS series, provided pin compatibility and electrical specifications align. Verify that any replacement maintains the same input voltage range and output current capability. Ensure the alternative part supports the required switching frequency adjustment range for EMI management.
