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Product Detailed Parameters
- Description：IC REG BUCK ADJ 700MA 16MSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：3.6V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：36V
- Current - Output：700mA
- Frequency - Switching：500kHz ~ 2MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Supplier Device Package：16-MSOP-EP
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Overview
The LT3689EMSE#TRPBF is a synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.4 V to 38 V and delivers a fixed 5 V output at up to 700 mA. The device integrates a watchdog timer and power-on reset function, operating at a fixed 2 MHz switching frequency. It features low quiescent current of 50 uA and functions within a temperature range of -40°C to +125°C. The component is housed in a 16-lead MSOP package.
Feature Summary
- Integrates a watchdog timer and power-on reset function for system reliability
- Synchronous buck topology enables high efficiency across load ranges
- Fixed 2 MHz switching frequency allows for compact external component sizing
Applications
- Industrial control systems requiring reliable power sequencing
- Embedded microprocessor supply rails with reset monitoring needs
- Battery-powered equipment utilizing wide input voltage ranges
Procurement Notes
Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the fixed 5V output variant matches the design requirement, as other voltage options exist within the LT3689 family. Ensure the MSOP-16 footprint aligns with the PCB layout specifications before finalizing procurement.
Selection Notes
Select this part when a combined buck regulator and system management function is required in a small footprint. The 2 MHz frequency reduces passive component size compared to lower frequency alternatives. Verify that the 700 mA output current meets the load requirements, as higher current variants are available in the same series.
Part Context
This component belongs to the LT3689 family of synchronous step-down regulators designed for applications needing integrated system supervision. It shares architectural similarities with other Analog Devices PMICs but distinguishes itself through the inclusion of hardware watchdog and reset logic within a single monolithic package.
Replacement Considerations
LT3689EMSE-5#PBF (Tube version)
FAQ
Does the LT3689EMSE#TRPBF support adjustable output voltage?
No, the EMSE-5 suffix indicates a fixed 5V output configuration. Adjustable versions use different suffixes.
What is the purpose of the integrated watchdog timer?
The watchdog timer monitors software activity and can trigger a system reset if the processor fails to toggle the WDG pin within a specified time interval.
