• Single Inductor Buck-Boost Controller for StepUp/Step-DownDC/DC Conversion
• Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 VMaximum)
• Flexible VOUT: 0.8 V to 55 V
• VOUT Short Protection
• High Efficiency Buck-Boost Transition
• Adjustable Switching Frequency
• Optional Frequency Sync and Dithering
• Integrated 2-A MOSFET Gate Drivers
• Cycle-by-Cycle Current Limit and Optional Hiccup
• Optional Input or Output Average Current Limiting
• Programmable Input UVLO and Soft-Start
• Power Good and Output Overvoltage Protection
• Available in HTSSOP-28 Package
• Create a Custom Design Using the LM5176
2 Applications
• Industrial PC Power Supplies
• USB Power Delivery
• Battery Powered Systems
• LED Lighting
3 Description
The LM5176 is a synchronous four-switch buck-boostDC/DC controller capable of regulating the outputvoltage at, above, or below the input voltage. TheLM5176 operates over a wide input voltage range of4.2 V to 55 V (60 V absolute maximum) to support avariety of applications.
The LM5176 employs current-mode control both inbuck and boost modes of operation for superior loadand line regulation. The switching frequency isprogrammed by an external resistor and can besynchronized to an external clock signal.
The device also features a programmable soft-startfunction and offers protection features includingcycle-by-cycle current limiting, input undervoltagelockout (UVLO), output overvoltage protection (OVP),and thermal shutdown.
In addition, the LM5176features optional average input or output currentlimiting, optional spread spectrum to reduce peakEMI, and optional hiccup mode protection insustained overload conditions.
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