Overview
The LM5175PWPT is a synchronous four-switch buck-boost DC/DC controller produced by Texas Instruments. This device is designed to regulate output voltage at, above, or below the input voltage, making it highly versatile for various applications. It operates over a wide input voltage range of 3.5 V to 42 V (with a maximum of 60 V) and supports output voltages from 0.8 V to 55 V. The LM5175PWPT employs current-mode control in both buck and boost modes, ensuring superior load and line regulation. It also features adjustable switching frequency, optional frequency sync, and dithering, along with integrated 2-A MOSFET gate drivers.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| VIN Input Voltage Range | 3.5 | - | 42 | V |
| BIAS Bias Supply Voltage Range | 8 | - | 36 | V |
| VOUT Output Voltage Range | 0.8 | - | 55 | V |
| EN/UVLO Enable Voltage Range | 0 | - | 42 | V |
| Operating Frequency Range | 100 | - | 600 | kHz |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | - | - | HTSSOP-28, QFN-28 | - |
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
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 LM5175PWPT?
The input voltage range is from 3.5 V to 42 V, with a maximum of 60 V. - What is the output voltage range of the LM5175PWPT?
The output voltage range is from 0.8 V to 55 V. - What are the package options for the LM5175PWPT?
The device is available in HTSSOP-28 and QFN-28 packages. - Does the LM5175PWPT support adjustable switching frequency?
Yes, the switching frequency can be programmed using an external resistor and can also be synchronized to an external clock signal. - What protection features does the LM5175PWPT offer?
The device features cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. - Can the LM5175PWPT operate in different conduction modes?
Yes, it supports both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) with optional pulse skipping. - What is the purpose of the DITH pin on the LM5175PWPT?
The DITH pin is used for dithering, which modulates the oscillator frequency to reduce EMI. - How does the soft-start function work on the LM5175PWPT?
The soft-start function is programmed using a capacitor connected to the SS pin, which controls the ramp-up time of the output voltage. - What is the role of the PGOOD pin on the LM5175PWPT?
The PGOOD pin is an open-drain output that indicates when the output voltage is within the regulation window. - Can the LM5175PWPT be used for automotive applications?
Yes, it is suitable for automotive start-stop systems among other applications.
