The SC4609 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 2.7V to 5.5V. A high level of integration reduces external component count, and makes it suitable for low voltage applications where cost, size and efficiency are critical. The SC4609 is capable of producing an output voltage as low as 0.5V.
The SC4609 is a highly integrated step-down (buck) regulator controller designed for low-voltage applications where cost, size, and efficiency are critical. It operates as a voltage mode PWM controller capable of producing output voltages as low as 0.5V by driving external N-channel MOSFETs with a peak gate current of 1A.
Key features include lossless current sensing for adjustable short circuit protection in both pulse-by-pulse and hiccup modes, an asynchronous start-up sequence, and an external soft-start function to prevent output voltage overshoot. The device is available in a 12-pin MLP lead-free package and complies with WEEE and RoHS standards.
| Supply Voltage Range | 2.7V to 5.5V |
|---|---|
| Output Voltage Minimum | 0.5V |
| Switching Frequency Max | 1MHz |
| Peak Gate Current | 1A |
| Sleep Mode Supply Current | < 10uA |
| Package Type | 12-pin MLP |
The device can produce an output voltage as low as 0.5V.
The switching frequency can be programmed up to 1MHz.
Sleep mode is invoked by clamping the FSET pin to a voltage below 75mV.