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Product Detailed Parameters
- Description：IC REG BUCK ADJ 550MA 16SO
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：7.4V
- Voltage - Input (Max)：48V
- Voltage - Output (Min/Fixed)：1.24V
- Voltage - Output (Max)：30V
- Current - Output：550mA (Switch)
- Frequency - Switching：100kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：16-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：16-SO
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Overview
The LT1777IS#TRPBF is a low noise, high voltage synchronous step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 7.4V to 48V and provides an adjustable output voltage from 1.24V to 30V. The device delivers a maximum switch current of 550mA at a fixed switching frequency of 100kHz. It features a low quiescent current of 620µA and a shutdown mode reducing current to 30µA. Packaged in a 16-lead SOIC, it supports junction temperatures from -40°C to +125°C.
Feature Summary
- Integrated synchronous rectification for improved efficiency without external Schottky diodes
- Fixed 100kHz switching frequency enables the use of small passive components
- Low noise architecture minimizes output ripple for sensitive analog loads
- Shutdown pin allows for system power management with ultra-low standby current
Applications
- Industrial control systems requiring isolated or non-isolated DC-DC conversion
- Battery-powered equipment needing efficient power regulation from higher voltage sources
- Embedded systems utilizing microcontrollers and DSPs with specific voltage requirements
- Telecommunications infrastructure power distribution networks
Procurement Notes
Verify the suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the IS grade temperature range matches your environmental requirements. Check official Analog Devices documentation for latest RoHS compliance status and material declarations. Ensure ESD handling procedures are followed during assembly due to the surface mount package type.
Selection Notes
Select this component when input voltages exceed standard 5V or 12V rails but remain below 48V. The 550mA output current suits moderate load applications where size constraints prevent larger regulators. The synchronous design reduces heat dissipation compared to non-synchronous alternatives. Verify that the 100kHz frequency aligns with your electromagnetic interference limits and inductor availability.
Part Context
This part belongs to the LT1777 family of high voltage synchronous buck converters. It shares architectural similarities with other LT177x variants but offers specific current and voltage ratings tailored for mid-power applications. The IS variant denotes industrial temperature performance, distinguishing it from commercial grade options within the same product line.
Replacement Considerations
Consult official Analog Devices substitution guides for verified equivalents. Cross-reference pinouts and thermal characteristics before replacing with similar buck converters from other manufacturers.
