company blog about TI LM5168FDDAR：300mA 120V Absolute Maximum, Step-Down Converter With Fly-Buck™Converter Capability

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

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

Typical Fly-Buck™ Converter Application Circuit

Functional Block Diagram