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TI LM5168FDDAR：300mA 120V Step-Down Converter With Fly-Buck™Converter Capability

Product Description Of LM5168FDDAR

LM5168FDDAR synchronous buck converters is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A minimum controllable on time of 50ns facilitates large step-down conversion ratios, enabling the direct step-down from a 48V nominal input to low-voltage rails for reduced system complexity and design cost. LM5168FDDAR operates during input voltage dips as low as 6V, at nearly 100% duty cycle if needed, making the device 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 LM5168FDDAR delivers up to 0.3A of output current. A constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. The LM5168FDDAR 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.

Specification Of LM5168FDDAR

Output Current:300 mA

Number of Outputs:1 Output

Input Voltage - Min:6 V

Input Voltage - Max:120 V

Quiescent Current:420 uA

Switching Frequency:100 kHz to 1 MHz

Minimum Operating Temperature:- 40 C

Maximum Operating Temperature:+ 150 C

Input Voltage:6 V to 120 V

Features Of LM5168FDDAR

Functional Safety-Capable

Documentation available to aid functional safety system design

Designed for reliability in rugged applications

Wide input voltage range of 6V to 120V absolute maximum

Junction temperature range: –40°C to +150°C

Fixed 3ms internal soft-start timer

Peak and valley current-limit protection

Input UVLO and thermal shutdown protection

Designed for scalable industrial power supplies and battery packs

Low minimum on and off times of 50ns

Adjustable switching frequency up to 1MHz

Diode emulation for high light-load efficiency

Auto mode with low quiescent current (< 10µA)

FPWM for Fly-Buck converter capability

3µA shutdown quiescent current

Pin-to-pin compatible with LM5164-Q1, LM5163-Q1, and LM5013-Q1

Similar pinout and functionality to LM5017 and LM34927.

Integration reduces design size and cost

COT mode control architecture

Integrated 1.9Ω NFET buck switch

Integrated 0.71Ω NFET synchronous rectifier

1.2V internal voltage reference

No loop compensation components

Internal VCC bias regulator and boot diode

Open-drain power-good indicator

Applications Of LM5168FDDAR

Communications – brick power module

Industrial battery pack (≥ 10 S)

Battery pack – e-bike, e-scooter, LEV