LM5168

ACTIVE

6-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability

Product details

Rating Catalog Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck, Flybuck Type Converter Iout (max) (A) 0.3 Vin (min) (V) 6 Vin (max) (V) 120 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 1000 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.2 Vout (max) (V) 48 Iq (typ) (µA) 10 Duty cycle (max) (%) 100
Rating Catalog Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck, Flybuck Type Converter Iout (max) (A) 0.3 Vin (min) (V) 6 Vin (max) (V) 120 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 1000 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.2 Vout (max) (V) 48 Iq (typ) (µA) 10 Duty cycle (max) (%) 100
HSOIC (DDA) 8 29.4 mm² 4.9 x 6
  • 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
  • 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.

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.

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Technical documentation

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* 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 (...)
User guide: PDF | HTML
Not available on TI.com
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 (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LM5168F PSpice Unencrypted Transient Model

SNVMCA0.ZIP (262 KB) - PSpice Model
CAD/CAE symbol

LM5168FEVM Altium Design Files

SNVR517.ZIP (18313 KB)
Calculation tool

SNVR520 LM5169 Quick Start Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM5168 6-V to 120-V wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability LM5168-Q1 Automotive 6-V to 120-V Wide VIN, 300-mA DC-DC converter with Fly-Buck™ capability LM5169 6V to 120V Wide VIN, 650-mA DC/DC converter with Fly-Buck™ capability
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
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HSOIC (DDA) 8 Ultra Librarian

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