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LM5176-Q1
55-V wide VIN synchronous 4-switch buck-boost controller, AEC-Q100 qualified
Data sheet
LM5176-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: -40°C to 125°C TA
- Functional Safety-Capable
- Single inductor buck-boost controller for step-up/step-down DC/DC conversion
- Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
- Flexible VOUT: 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
- Available in HTSSOP-28 package
- Create a custom design using the LM5176-Q1 with the WEBENCH Power Designer
The LM5176-Q1 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5176-Q1 operates over a wide input voltage range of 4.2 V to 55 V (60 V absolute maximum) to support a variety of applications.
The LM5176-Q1 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 LM5176-Q1 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5176-Q1 55-V Wide VIN Synchronous 4-Switch Buck-Boost Controller datasheet (Rev. B) | PDF | HTML | 13 Aug 2021 |
| Application note | Bidirectional TEC Driver Design for 40-W TEC | PDF | HTML | 02 Jun 2023 | |
| Functional safety information | LM5176 and LM5176-Q1 Functional Safety, FIT Rate, Failure FMD | 22 May 2020 | ||
| Application note | LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters | 16 Jul 2018 | ||
| White paper | An overview of radiated EMI specifications for power supplies | 05 Jun 2018 | ||
| White paper | An overview of conducted EMI specifications for power supplies | 01 Feb 2018 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5176EVM-HP — LM5176 Wide-VIN Buck-Boost Controller Evaluation Module
The LM5176EVM-HP demonstrates a flexible high power buck-boost design using the LM5176 wide-vin buck-boost controller. The evaluation module is configured to operate from an input voltage range of 6V-36V and to provide a regulated 12-V output with up to 12A of load current.
User guide: PDF
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs
PMP31052 — Automotive, four-switch, >300-W buck-boost reference design
This reference design is an automotive, four-switch, buck-boost converter circuit using the LM5176-Q1 controller IC. The power supply is able to step up and step down the input voltage. The design accepts an input voltage of 4.5 V to 27 V and provides a regulated output of 12 V that can deliver up (...)
Test report: PDF
| Package | Pins | Download |
|---|---|---|
| HTSSOP (PWP) | 28 | View options |
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