The SS88/89 is a series of high conversion efficiency, low power consumption, and high operating frequency PFM synchronous boost DC-DC converter chip. Using PFM control circuit, the chip can automatically switch duty cycle coefficient according to the load current, which can obtain low ripple, high efficiency and wide output voltage range. The built-in synchronous switch tube and the low consumption current of the chip can effectively improve the conversion efficiency of DC-DC and equipment life cycle. Only three components are needed on the periphery to boost the low input battery voltage to the desired operating voltage.
SS61 is a high efficiency synchronous step-up converter with ultra-low quiescent current. It is capable of delivering at least 2W of power from a low voltage source, i.e. 0.4A at 5V output. It also features a true-shutoff function that disconnects the input from output, during shutdown and output short-circuit conditions. This eliminates the need for an external MOSFET and its control circuitry to disconnect the input from output and provides robust output overload protection. A high switching frequency minimizes solution footprint by allowing the use of tiny and low profile inductors and ceramic capacitors. An internal synchronous MOSFET provides highest efficiency and with a current mode control that is internally compensated, external parts count is reduced to minimal. With the ultra-low Iq feature, SS61 is ideal for solution that requires low standby power and compact board size such as IoT applications.