3.3V/5V or Adjustable, Step-Up Step-Down DC-DC Converters

The MAX710/MAX711 integrate a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. They are optimized for battery applications where the input varies above and below the regulated output voltage. They have an input range from +1.8V to +11V. Typical efficiency when boosting battery inputs is 85%.

The MAX710/MAX711 can be configured for minimum noise or optimum efficiency. Shutdown control turns off the part completely, disconnecting the input from the output (ISHDN = 0.2µA). Standby control turns off only the step-up converter and leaves the low-power linear regulator active (IQ = 7µA).

The MAX710 has a preset 3.3V or 5V output voltage. The MAX711 has an adjustable output that can be set from +2.7V to +5.5V with two resistors. Both devices come in 16-pin narrow SO packages.

Applications

* 2- to 4-Cell AA Alkaline Handheld Equipment * 2-, 3-, and 4-Cell Battery-Powered Equipment * 3.3V and Other Low-Voltage Systems * Battery-Powered Devices with AC Input Adapters * Digital Still Cameras * Single-Cell, Lithium-Powered Portable Devices

* Step-Up/Down Voltage Conversion

* +1.8V to +11V Input Range

* Output:

* 5V/250mA at VIN = 1.8V

* 5V/500mA at VIN = 3.6V

* No External FETs Required

* Load Disconnected from Input in Shutdown

* Battery Drain:

* 200µA No-Load (VIN = 4V)

* 7µA in Standby

* 0.2µA when Off

* Low-Noise and High-Efficiency Modes