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AC/DC & DC/DC converters (integrated FET)

LM5169

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6V to 120V Wide VIN, 650-mA DC/DC converter with Fly-Buck™ capability

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Data sheet

LM5169

ACTIVE
Data sheet Order now

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) 0.65 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, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.2 Vout (max) (V) 90 Iq (typ) (µA) 10 Duty cycle (max) (%) 99
Rating Catalog Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck, Flybuck Type Converter Iout (max) (A) 0.65 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, Soft Start Fixed, Synchronous Rectification, UVLO adjustable Control mode Constant on-time (COT) Vout (min) (V) 1.2 Vout (max) (V) 90 Iq (typ) (µA) 10 Duty cycle (max) (%) 99
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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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
Functional safety information LM5168 and LM5169 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 11 Nov 2024
Certificate LM5169PEVM EU RoHS Declaration of Conformity (DoC) 31 Oct 2024
Certificate LM5169FEVM EU Declaration of Conformity (DoC) 27 Aug 2024
Application note Inverting Buck-Boost Application for the LM5168 PDF | HTML 24 Feb 2023
Functional safety information LM516x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 01 Sep 2022

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

LM5169 PSpice Transient Model

SNVMCE6.ZIP (15528 KB) - PSpice Model
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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
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Design tool

LM5169-BUCK-FLY-BUCK-DESIGN-CALC — LM5169 quick-start calculator for buck and Fly-Buck designs

LM5169 quick-start calculator for buck and Fly-Buck designs
Supported products & hardware

Supported products & hardware

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