LM5169 DC/DC Converter With Fly-Buck™ Capability

Texas Instruments' LM5169 is a synchronous buck converter that is designed to regulate over a wide input voltage range, minimizing the need for external surge suppression components. A controllable on-time of 50 ns (minimum) 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 converter operates during input voltage dips down to 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. The constant on-time (COT) control architecture provides nearly constant switching frequency with excellent load and line transient response. The converter is available in FPWM or auto-mode versions. The FPWM mode provides forced-CCM operation across the load range supporting isolated Fly-Buck converter applications. The auto-mode enables ultra-low I_Q and diode emulation mode operation for high light-load efficiency.