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Data sheet
LM5168
- Designed for reliability in rugged applications
- Wide input voltage range of 6 V to 120 V
- Junction temperature range: –40°C to +150°C
- Fixed 3-ms internal soft-start timer
- Peak and valley current-limit protection
- Input UVLO and thermal shutdown protection
- Suited for scalable industrial power supplies and battery packs
- Low minimum on and off times of 50 ns
- Adjustable switching frequency up to 1 MHz
- Diode emulation for high light-load efficiency
- Auto mode with low quiescent current (< 10 µA)
- FPWM for fly-buck converter capability
- 3-µA shutdown quiescent current
- Pin-to-pin compatible with LM5164, LM5163, LM5017, and LM34927
- Integration reduces solution size and cost
- COT mode control architecture
- Integrated 1.9-Ω NFET buck switch
- Integrated 0.71-Ω NFET synchronous rectifier
- 1.2-V internal voltage reference
- No loop compensation components
- Internal VCC bias regulator and boot diode
- Open-drain power-good indicator
- SOIC PowerPAD™ integrated circuit package
The LM5169 and LM5168 synchronous buck converters are designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A minimum controllable on time of 50 ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM516x operates during input voltage dips as low as 6 V, at nearly 100% duty cycle if needed, making it an excellent choice for wide input supply range industrial and high cell count battery pack applications.
With integrated high-side and low-side power MOSFETs, the LM5169 delivers up to 0.65-A of output current and the LM5168 delivers up to 0.3-A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. The LM516x is available in FPWM or auto mode versions. FPWM mode provides forced CCM operation across the entire load range supporting isolated fly-buck converter applications. Auto mode enables ultra-low IQ and diode emulation mode operation for high light-load efficiency.
Technical documentation
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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5169, LM5168 0.65-A/0.3-A, 120-V, Step-Down Converter with Fly-Buck Converter Capability datasheet (Rev. A) | PDF | HTML | 18 Jul 2022 |
| Application note | Inverting Buck-Boost Application for the LM5168 | PDF | HTML | 24 Feb 2023 | |
| Application note | Design Considerations of Stacked BQ769x2 With High-Side N-MOSFET | PDF | HTML | 09 Feb 2023 | |
| Functional safety information | LM5168 and LM5169 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 01 Sep 2022 | |
| Functional safety information | LM516x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) | PDF | HTML | 01 Sep 2022 | |
| More literature | LM5168PEVM EU RoHS Declaration of Conformity (DoC) | 04 Aug 2022 | ||
| EVM User's guide | LM5168PEVM EVM User's Guide | PDF | HTML | 02 Aug 2022 | |
| User guide | LM5168FEVM EVM User's Guide | PDF | HTML | 18 Nov 2021 | |
| Certificate | LM5168FEVM EU RoHS Declaration of Conformity (DoC) | 20 Oct 2021 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM5168FEVM — LM5168 evaluation module 115-V fly-buck regulator
The LM5168FEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5168, a 115-V DC/DC fly-buck regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 20 V to (...)
Evaluation board
LM5168PEVM — LM5168P 115-V DC/DC buck regulator evaluation module
The LM5168P evaluation module (EVM) is a 115 V DC/DC buck regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint. The EVM operates over a wide input voltage range of 20 V to 115 V (120 V absolute maximum) to provide a regulated 12 V output at up (...)
Reference designs
TIDA-010247 — High-side N-MOSFET control (up to 32s) battery pack reference design with stacked battery monitor
This reference design is a high-side, N-channel MOSFET control (up to 32s) battery pack, using the stacked BQ769x2 battery monitor family. This design monitors each cell voltage, pack current, cell and MOSFET temperature and protects the battery pack for secure safe use. The high-side N-channel (...)
Design guide: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HSOIC (DDA) | 8 | Ultra Librarian |
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