Overview
The LM5176-Q1, produced by Texas Instruments, is a synchronous four-switch buck-boost DC/DC controller designed to regulate output voltage at, above, or below the input voltage. This device operates over a wide input voltage range of 4.2 V to 55 V (60 V absolute maximum), making it versatile for various applications. It employs current-mode control in both buck and boost modes, ensuring superior load and line regulation. The LM5176-Q1 features integrated 2-A MOSFET gate drivers, programmable soft-start, and multiple protection mechanisms including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. It is AEC-Q100 qualified for automotive applications and is functional safety-capable, making it suitable for critical systems.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 4.2 V (2.5 V with bias) | - | 55 V (60 V absolute maximum) | V |
| Output Voltage (VOUT) | 0.8 V | - | 55 V | V |
| Switching Frequency | 100 kHz | - | 600 kHz | Hz |
| MOSFET Gate Drivers | - | 2 A | - | A |
| Operating Temperature | -40°C | - | 125°C | °C |
| Package | - | - | HTSSOP-28 | - |
Key Features
- High efficiency buck-boost transition
- Adjustable switching frequency and optional frequency sync and dithering
- Integrated 2-A MOSFET gate drivers
- Cycle-by-cycle current limit and optional hiccup mode protection
- Optional input or output average current limiting
- Programmable input UVLO and soft-start
- Power good and output overvoltage protection
- VOUT short protection
- AEC-Q100 qualified for automotive applications and functional safety-capable
- Single inductor buck-boost controller for step-up/step-down DC/DC conversion
Applications
- Automotive start-stop systems
- Backup battery and supercapacitor charging
- USB power delivery
- Battery-powered systems
- LED lighting
Q & A
- What is the input voltage range of the LM5176-Q1?
The input voltage range is from 4.2 V to 55 V (60 V absolute maximum).
- What is the output voltage range of the LM5176-Q1?
The output voltage range is from 0.8 V to 55 V.
- What is the switching frequency range of the LM5176-Q1?
The switching frequency can be programmed between 100 kHz and 600 kHz.
- Does the LM5176-Q1 have integrated MOSFET gate drivers?
Yes, it has integrated 2-A MOSFET gate drivers.
- What protection features does the LM5176-Q1 offer?
The device offers cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), thermal shutdown, and optional hiccup mode protection.
- Is the LM5176-Q1 suitable for automotive applications?
Yes, it is AEC-Q100 qualified for automotive applications and is functional safety-capable.
- What package is the LM5176-Q1 available in?
The LM5176-Q1 is available in the HTSSOP-28 package.
- Can the switching frequency be synchronized to an external clock signal?
Yes, the switching frequency can be synchronized to an external clock signal.
- Does the LM5176-Q1 support soft-start and UVLO programming?
Yes, it supports programmable soft-start and input UVLO with hysteresis.
- What is the operating temperature range of the LM5176-Q1?
The operating temperature range is from -40°C to 125°C.
