MAX686EEE+
ActiveDAC-CONTROLLED BOOST INVERTER LCD BIAS SUPPLY WITH INTERNAL SWITCH
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MAX686EEE+
ActiveDAC-CONTROLLED BOOST INVERTER LCD BIAS SUPPLY WITH INTERNAL SWITCH
Technical Specifications
Parameters and characteristics for this part
| Specification | MAX686EEE+ |
|---|---|
| Current - Output | 600 mA |
| Frequency - Switching | 300 kHz |
| Function | Step-Up |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 C |
| Operating Temperature [Min] | -40 ¯C |
| Output Configuration | Positive or Negative |
| Output Type | Adjustable |
| Package / Case | 16-SSOP |
| Package / Case [x] | 0.154 in |
| Package / Case [y] | 3.9 mm |
| Supplier Device Package | 16-QSOP |
| Synchronous Rectifier | False |
| Topology | Boost |
| Voltage - Input (Max) [Max] | 27.5 V |
| Voltage - Input (Min) [Min] | 0.8 V |
| Voltage - Output (Max) | 27.5 V |
| Voltage - Output (Min/Fixed) | 1.25 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | N/A | 618 | $ 11.78 | |
| 4300 | $ 11.78 | |||
Description
General part information
MAX686 Series
The MAX686 DAC-controlled boost/inverter IC converts a positive input voltage to a positive or negative LCD bias voltage up to +27.5V or -27.5V. The device features an internal N-channel MOSFET switch, programmable current limiting, and an internal 6-bit digital-to-analog converter (DAC) for digital adjustment of the output voltage. It comes in a small 16-pin QSOP package (same size as an 8-pin SO).The MAX686 uses a current-limited, pulse-frequency-modulation (PFM) control scheme to provide high efficiency over a wide range of load conditions. Its high switching frequency (up to 300kHz) allows the use of small external components.An LCDON output allows the LCD bias voltage to be automatically disabled when the display logic voltage is removed, protecting the display. The MAX686 has a +2.7V to +5.5V input voltage range for the IC, and a +0.8V to +27.5V input voltage range for the inductor. Typical quiescent supply current is 65µA. Shutdown current is 1.5µA.The MAX686 offers high-level integration to save space, reduce power consumption, and increase battery life, making it an excellent choice for battery-powered portable equipment. The MAX629 is similar to the MAX686, except that it does not contain a built-in DAC. Both devices have evaluation kits to facilitate designs.ApplicationsNotebook ComputersPalmtop ComputersPDAs and Other Handheld DevicesPortable Data-Collection TerminalsPositive or Negative LCD BiasVaractor Tuning Diode Bias
