SGM64A00

The SGM64A00 is a wide input voltage range synchronous Buck controller, supporting an input voltage range of 6.5V to 100V. The minimum high-side MOSFET on-time of 40ns effectively supports low duty cycle applications. The device can be directly applied to industrial-standard 48V high-voltage DC power supply systems, enabling step-down conversion to low-voltage power rails (e.g., 5V/12V). The SGM64A00 is suitable for applications with stringent requirements on input voltage fluctuations, such as industrial power supplies and communication base stations. 

The SGM64A00 is feed-forward voltage-mode control architecture, which dynamically adjusts the ramp signal by sampling the input voltage (VIN) in real-time and generating a proportional ramp signal (VRAMP = VIN/kFF). This control architecture improves the transient response of the system to input voltage variations, simplifies the compensation network design, and delivers good dynamic performance and stability across a wide input voltage range. 

Fixed frequency pulse width modulation (FPWM) control architecture with programmable switching frequency capability spanning 100kHz to 1MHz. It incorporates an optional discontinuous conduction mode (DCM) featuring integrated valley current detection, enabling low-side MOSFET turn-off control to minimize switching losses and reverse recovery losses during light-load operation. 

The gate drive voltage is 7.5V, supporting a sink capability of 3A and a source current of 2A. An external supply can be applied to VCC to achieve higher drive voltages, supporting up to 14V for enhanced drive voltage. 

The SGM64A00 features synchronization capability, allowing the gate drive signal to synchronize with the SYNCIN clock signal, while the SYNCOUT pin outputs a clock signal with a 180° phase shift relative to the HO drive signal. This function effectively reduces input voltage ripple and minimizes EMI filter size in multi-channel or cascaded power supply applications. 

The SGM64A00 also integrates the following features: programmable soft-start, a power detection module with a power-good (PG) indicator, output voltage tracking (ensuring monotonic startup with pre-biased loads), hiccup mode over-current protection, and recoverable over-temperature protection. 

The SGM64A00 is available in a Green TQFN-3.5×4.5-20BL package and specified over a junction temperature range of -40℃ to +150℃.