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Product Detailed Parameters
- Description：IC REG
- Series：-
- Mfr：Texas Instruments
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Buck-Boost
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：3.5V ~ 78V
- Frequency - Switching：100kHz ~ 2MHz
- Duty Cycle (Max)：100%
- Synchronous Rectifier：No
- Clock Sync：Yes
- Serial Interfaces：-
- Control Features：Dead Time Control, Enable, Power Good, Power On Reset, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：38-PowerTFSOP (0.173", 4.40mm Width)
- Supplier Device Package：38-HTSSOP
- Grade：-
- Qualification：-
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Overview
The LM5177DCP is a non-isolated, bidirectional four-switch buck-boost controller from Texas Instruments. It supports an input voltage range of 3.5 V to 78 V and an output voltage range of 3.3 V to 78 V. The device operates with a switching frequency up to 2 MHz and features low shutdown current of 3 μA and operating current of 60 μA. It includes integrated high-voltage LDOs, a 2-A peak current gate driver, and dynamic output voltage tracking. The component is housed in a PowerTFSOP package.
Feature Summary
- Bidirectional four-switch topology for seamless buck, boost, and buck-boost operation
- Integrated 2-A peak current logic level gate driver with bootstrap protection
- Dynamic output voltage tracking capability for PWM or analog signals
- Selectable power save mode to optimize light-load efficiency
Applications
- Non-isolated DC/DC supplies including merchant DC/DC and remote radio units
- Backup power systems such as battery backup and fire safety applications
- Industrial PC single board computer power management
- Medical PSU applications like oxygen concentrators
Procurement Notes
Verify the specific suffix 'DCP' against the manufacturer datasheet to confirm the exact package type and tape/reel specifications. Ensure the ordering part number matches the required temperature grade and packaging format. Cross-reference with the official LM5177 product page to confirm availability status and any recent design revisions that may affect compatibility.
Selection Notes
Select this controller when a wide input voltage range exceeding standard buck-boost limits is required. It is suitable for designs needing precise reverse current limiting for charging applications. Consider the 2 MHz switching frequency for smaller passive component sizes. Evaluate the need for dynamic voltage tracking if system synchronization is critical.
Part Context
The LM5177 belongs to Texas Instruments' family of wide-input voltage synchronous buck-boost controllers. It is designed for high-efficiency power conversion in industrial and commercial environments. The device integrates multiple protections including hiccup overcurrent and adjustable undervoltage protection for robust system operation.
Replacement Considerations
LM517701DCPR: Offers similar functionality with additional phase control and power good features. LM51772RHAR: Provides comparable performance with isolated topology options.
