Overview
The LM5176RHFR, produced by Texas Instruments, is a synchronous four-switch buck-boost DC/DC controller. This device is capable of regulating the 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 4.2 V to 55 V (with a 60-V absolute maximum), supporting a broad range of input conditions. The LM5176 uses current-mode control in both buck and boost modes, ensuring superior load and line regulation.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 4.2 V to 55 V (60 V maximum) |
| Output Voltage Range | 0.8 V to 55 V |
| Switching Frequency | Programmable by external resistor, optional synchronization |
| MOSFET Gate Drivers | Integrated 2-A MOSFET gate drivers |
| Current Limiting | Cycle-by-cycle current limit, optional hiccup mode |
| Current Limiting Options | Optional input or output average current limiting |
| Protection Features | Input undervoltage lockout (UVLO), output overvoltage protection (OVP), thermal shutdown |
| Package Options | HTSSOP-28, QFN-28 |
Key Features
- Single inductor buck-boost controller for step-up/step-down DC/DC conversion
- High efficiency buck-boost transition
- Optional frequency sync and dithering to reduce EMI
- Programmable soft-start function
- Power Good and output overvoltage protection
- Optional spread spectrum to reduce peak EMI
- Functional Safety-Capable
Applications
- Automotive systems, including audio amplifiers and battery backup systems
- Industrial power supplies and PC power systems
- High-power buck-boost designs requiring flexible input and output voltages
- Systems needing high efficiency and low EMI
Q & A
- What is the input voltage range of the LM5176RHFR?
The input voltage range is from 4.2 V to 55 V, with a maximum absolute voltage of 60 V.
- What is the output voltage range of the LM5176RHFR?
The output voltage range is from 0.8 V to 55 V.
- How is the switching frequency programmed?
The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.
- What protection features does the LM5176RHFR offer?
The device offers cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown.
- What are the package options for the LM5176RHFR?
The device is available in HTSSOP-28 and QFN-28 packages.
- Does the LM5176RHFR support functional safety?
Yes, the LM5176RHFR is Functional Safety-Capable.
- How can the soft-start function be configured?
The soft-start function is programmable.
- What is the purpose of the optional frequency dithering feature?
The optional frequency dithering feature is used to reduce peak EMI.
- Can the LM5176RHFR be used in automotive applications?
Yes, it can be used in automotive systems, including audio amplifiers and battery backup systems.
- Is the LM5176RHFR suitable for high-power applications?
Yes, it is suitable for high-power buck-boost designs requiring flexible input and output voltages.
