MAX608

19-0438; Rev 0; 9/95 NUAL KIT MA ATION EET H S A EVALU T WS DA FOLLO 5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller ____________________________Features o 1.8V to 16.5V Input Range o 85% Efficiency for 30mA to 1.5A Load Currents o Up to 10W Output Power o 110µA Max Supply Current o 5µA Max Shutdown Current o Preset 5V or Adjustable Output (3V to 16.5V) o Current-Limited PFM Control Scheme o Up to 300kHz Switching Frequency o Evaluation Kit Available _______________General Description The MAX608 low-voltage step-up controller operates from a 1.8V to 16.5V input voltage range. Pulse-frequency-modulation (PFM) control provides high efficiency at heavy loads, while using only 85µA (typical) when operating with no load. In addition, a logic-controlled shutdown mode reduces supply current to 2µA typical. The output voltage is factory-set at 5V or can be adjusted from 3V to 16.5V with an external resistor divider. The MAX608 is ideal for two- and three-cell batterypowered systems. An operating frequency of up to 300kHz allows use with small surface-mount components. The MAX608 operates in “bootstrapped” mode only (with the chip supply, OUT, connected to the DC-DC output). For a 12V output without external resistors, or for nonbootstrapped applications (chip supply connected to input voltage), refer to the pin-compatible MAX1771. The MAX608 is available in 8-pin DIP and SO packages. MAX608 ________________________Applications High-Efficiency DC-DC Converters Battery-Pow...