Overview
The LM5175PWPR from Texas Instruments is a synchronous four-switch buck-boost DC/DC controller designed for step-up/step-down DC/DC conversion. This controller operates over a wide input voltage range of 3.5 V to 42 V, with a maximum voltage of 60 V, making it versatile for various applications. It employs current-mode control in both buck and boost modes, ensuring superior load and line regulation. The LM5175 features adjustable switching frequency, programmable soft-start, and multiple protection mechanisms including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. Available in HTSSOP-28 and QFN-28 packages, this controller is suitable for applications requiring high efficiency and robust control over output voltage.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VIN Input Voltage Range | 3.5 | - | 42 | V |
| VOUT Output Voltage Range | 0.8 | - | 55 | V |
| BIAS Bias Supply Voltage Range | 8 | - | 36 | V |
| Operating Frequency Range | 100 | - | 600 | kHz |
| Operating Temperature Range | -40 | - | 125 | °C |
| Switching Frequency (RT = 133 kΩ) | 180 | 200 | 220 | kHz |
| Switching Frequency (RT = 47 kΩ) | 430 | 500 | 565 | kHz |
Key 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
- Available in HTSSOP-28 and QFN-28 Packages
Applications
- Automotive Start-Stop Systems
- Backup Battery and Supercapacitor Charging
- Industrial PC Power Supplies
- USB Power Delivery
- LED Lighting
Q & A
- What is the input voltage range of the LM5175PWPR?
The input voltage range is from 3.5 V to 42 V, with a maximum voltage of 60 V.
- What are the output voltage range capabilities of the LM5175PWPR?
The output voltage range is from 0.8 V to 55 V.
- What are the key protection features of the LM5175PWPR?
The key protection features include cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown.
- Can the switching frequency of the LM5175PWPR be adjusted?
- What are the available package options for the LM5175PWPR?
The LM5175PWPR is available in HTSSOP-28 and QFN-28 packages.
- What is the operating temperature range of the LM5175PWPR?
The operating temperature range is from -40°C to 125°C.
- Does the LM5175PWPR support selectable operation modes?
- What is the purpose of the soft-start function in the LM5175PWPR?
The soft-start function is programmable and helps in reducing inrush current during startup.
- Can the LM5175PWPR be used for automotive applications?
- How does the LM5175PWPR handle current limiting?
- What is the role of the BIAS pin in the LM5175PWPR?
