Product details

Vin (Min) (V) 6 Vin (Max) (V) 120 Vout (Min) (V) 1.2 Vout (Max) (V) 90 Iout (Max) (A) 0.3 Iq (Typ) (uA) 10 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 Rating Automotive Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (Max) (%) 99
Vin (Min) (V) 6 Vin (Max) (V) 120 Vout (Min) (V) 1.2 Vout (Max) (V) 90 Iout (Max) (A) 0.3 Iq (Typ) (uA) 10 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 Rating Automotive Regulated outputs (#) 1 Control mode Constant on-time (COT) Duty cycle (Max) (%) 99
HSOIC (DDA) 8 19 mm² 4.9 x 3.9
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, ambient temperature range
  • 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 automotive HEV/EV power supplies
    • 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-Q1, LM5163-Q1, LM5017, LM5013-Q1and 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
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, ambient temperature range
  • 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 automotive HEV/EV power supplies
    • 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-Q1, LM5163-Q1, LM5017, LM5013-Q1and 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 -Q1 and LM5168 -Q1 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 -Q1 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 -Q1 delivers up to 0.65-A of output current and the LM5168 -Q1 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 -Q1 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 -Q1 and LM5168 -Q1 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 -Q1 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 -Q1 delivers up to 0.65-A of output current and the LM5168 -Q1 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 -Q1 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 LM516x-Q1 0.65/0.3-A, 120-V Step-Down Converter w/ Fly-Buck Converter Capability datasheet (Rev. A) 29 Oct 2021
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
Functional safety information LM516x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 01 Sep 2022
User guide LM5168FEVM EVM User's Guide PDF | HTML 18 Nov 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

Design & development

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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 fly-buck regulator evaluation module

The LM5168PEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5168P, 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
Simulation model

LM5168F PSpice Unencrypted Transient Model

SNVMCA0.ZIP (262 KB) - PSpice Model
Calculation tool

LM5169 Quick Start Calculator

SNVR520.ZIP (2167 KB)
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 (...)
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SO PowerPAD (DDA) 8 View options

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