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 Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
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 Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
HSOIC (DDA) 8
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, ambient temperature range
  • Designed for reliable and 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 mode enables fly-buck capability
    • 3-µA shutdown quiescent current
    • Pin-to-pin compatible with LM5164-Q1, LM5163-Q1, 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
    • 8-pin SOIC package with PowerPAD™ with 30°C/W RθJA (EVM)
  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, ambient temperature range
  • Designed for reliable and 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 mode enables fly-buck capability
    • 3-µA shutdown quiescent current
    • Pin-to-pin compatible with LM5164-Q1, LM5163-Q1, 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
    • 8-pin SOIC package with PowerPAD™ with 30°C/W RθJA (EVM)

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 LM5169-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 LM5169-Q1 is available in FPWM or Auto mode operation. FPWM mode ensures forced CCM operation across the entire load range supporting isolated Fly-buck operation. 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 LM5169-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 LM5169-Q1 is available in FPWM or Auto mode operation. FPWM mode ensures forced CCM operation across the entire load range supporting isolated Fly-buck operation. 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-Q1/LM5168-Q1 0.65-A/0.3-A, 120-V, Step-Down Converter with Fly-Buck™ Converter Capability datasheet 30 Jun 2021
User guide LM5168FEVM EVM User's Guide 18 Nov 2021
Functional safety information LM5168-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 12 Oct 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 (...)
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Evaluation board

LM5169FQEVM — LM5169-Q1 evaluation module 120-V Fly-Buck™ converter

The LM5169FQEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5169-Q1  (LM5169FQDDAR) synchronous step-down converter. The LM5169-Q1 has a wide input voltage range of 6 V to 120 V, peak and valley current limit protection and low minimum on-time of (...)
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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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