Simplified Block Diagram
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- 1.8V to 20V Battery Input Voltage
- Automatic Disable when Display Logic is Shut Down
- Extremely Small QSOP Package
- 32-Level Internal DAC
- SMBus Serial Interface (MAX1621)
- Positive or Negative Output Voltage
- Notebook Computers
- Palmtop Computers
- PDAs and Other Handheld Devices
- Portable Data-Collection Terminals
Output voltage can be set to a desired positive or negative voltage range with external resistors, and adjusted over that range with the on-board digital-to-analog converter (DAC) or with a potentiometer. The MAX1620/ MAX1621 include a 5-bit DAC, allowing digital software control of the bias voltage. The MAX1620 uses up/down digital signaling to adjust the DAC, and the MAX1621 uses the System Management Bus (SMBus™) 2-wire serial interface.
These devices use a low-cost, external, N-channel MOSFET power switch or NPN transistor, and can be configured for positive or negative output voltages. Operating current is a low 150µA, typically provided from a display's logic supply of 3.0V to 5.5V. The MAX1620/MAX1621 are available in a 16-pin QSOP package.