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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 750MA 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)：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-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Supplier Device Package：10-MSOP-EP
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Overview
The LT3973EMSE-3.3#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., designed for industrial applications. It accepts an input voltage range of 4.2V to 25V and provides a fixed 3.3V output at up to 0.75A. The device features adjustable switching frequency from 200kHz to 2MHz and operates with only 2.5µA quiescent current. It utilizes Burst Mode operation for high efficiency at light loads while maintaining low output ripple. The component is housed in a 10-MSOP package with exposed pad and supports junction temperatures from -40°C to 125°C.
Feature Summary
- Adjustable frequency monolithic buck topology with integrated high-efficiency switch, catch diode, and boost diode
- Low quiescent current consumption of 2.5µA for extended battery life in standby modes
- Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 10mV
Applications
- Industrial control systems requiring wide input voltage tolerance
- Battery-powered equipment needing ultra-low standby power consumption
- Embedded systems utilizing 3.3V logic rails
Procurement Notes
Verify the specific suffix EMSE-3.3 corresponds to the required fixed 3.3V output variant and MSOP-10 package. Confirm the #PBF designation indicates lead-free compliance. Ensure the operating temperature grade matches the environmental requirements of the target application. Cross-reference the manufacturer datasheet for pinout compatibility and thermal dissipation characteristics before finalizing procurement orders.
Selection Notes
Select this component when a fixed 3.3V rail is needed with minimal external component count. The adjustable frequency feature allows optimization for size versus efficiency trade-offs. Consider the 2.5µA quiescent current for applications requiring long battery life. Verify that the 0.75A output current meets the load requirements. The exposed pad design aids in thermal management for surface-mount implementations.
Part Context
This part belongs to the LT3973 family of step-down regulators from Analog Devices. The family includes variants with different output voltages and packages, such as the LT3973IDD and LT3973IMSE. The LT3973 series is characterized by its wide input voltage range and low static current, making it suitable for various DC-DC conversion tasks in portable and industrial electronics.
Replacement Considerations
Direct substitutes include other parts within the LT3973 family with compatible electrical specifications. Check for equivalent packages like the IDD variant if DFN packaging is preferred. Ensure any replacement maintains the 2.5µA quiescent current and 0.75A output capability. Verify thermal performance and pinout compatibility for seamless integration.
