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 85?A (typical) when operating with no load. In addition, a logic-controlled shutdown mode reduces supply current to 2?A 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 battery-powered 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：典型工作电路 MAX608：典型工作电路 放大+
1.8V to 16.5V Input Range
85% Efficiency for 30mA to 1.5A Load Currents
Up to 10W Output Power
110?A Max Supply Current
5?A Max Shutdown Current
Preset 5V or Adjustable Output (3V to 16.5V)
Current-Limited PFM Control Scheme
Up to 300kHz Switching Frequency
Evaluation Kit Available