Texas Instruments LM5175

Description

The LM5175 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5175 operates over a wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of applications.

The LM5175 employs current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5175 features selectable Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) operation, optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

Features

• Single Inductor Buck-Boost Controller for Step-
• Up/Step-Down DC/DC Conversion
• Wide VIN Range: 3.5 V to 42 V, 60 V Maximum
• Flexible VOUT Range: 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
• Selectable CCM or DCM with Pulse Skipping
• HTSSOP-28 Package (Contact Factory for QFN)

Typical applications

• Industrial PC Power Supplies
• USB Power Delivery
• Backup Battery and Supercapacitor Charging
• Automotive Start-Stop Systems
• LED Lighting

More information

• Datasheet
• IC product information