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MAX686EEE
DAC-Controlled Boost/Inverter LCD Bias Supply with Internal Switch
General DescriptionThe 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 pack-
age (same size as an 8-pin SO).
The MAX686 uses a current-limited, pulse-frequency-
modulation (PFM) control scheme to provide high effi-
ciency over a wide range of load conditions. Its high
switching frequency (up to 300kHz) allows the use of
small external components.
An LCDONoutput 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.
ApplicationsPositive or Negative LCD Bias
Personal Digital Assistants
Notebook Computers
Portable Data-Collection Terminals
Palmtop Computers
Varactor Tuning Diode Bias
____________________________FeaturesInternal 500mA, 28V N-Channel Switch
(no external FET required)Adjustable Output Voltage to +27.5V or -27.5V6-Bit DAC-Controlled Output VoltageUp to 90% EfficiencySmall 16-Pin QSOP Package
(Same size as 8-pin SO)Power-OK Indicator65µA Quiescent Current1.5µA Shutdown CurrentUp to 300kHz Switching Frequency
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
Typical Operating Circuit
Pin Configuration
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= VDD= VIN= +5V, CREF= 0.1µF, TA
= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage
VCC, ISET, POK, POL, SHDN,
UP, DN, VDDto GND...........................................-0.3V to +6V
FB, REF, DACOUT to GND.......................-0.3V to (VCC+ 0.3V)
PGND to GND.....................................................-0.3V to +0.3V
LX, LCDONto GND..............................................-0.3V to +30V
Current
LX (sinking).....................................................................600mA
LCDON(sinking)...............................................................10mA
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.30mW/°C above +70°C)......................667mW
Operating Temperature Ranges
MAX686C/D..........................................................0°C to +70°C
MAX686EEE.......................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ELECTRICAL CHARACTERISTICS (continued)(VCC= VDD= VIN= +5V, CREF= 0.1µF, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ELECTRICAL CHARACTERISTICS(VCC= VDD= VIN= +5V, CREF= 0.1µF, TA
= -40°C to +85°C, unless otherwise noted.) (Note 4)
Note 1:The MAX686 requires a supply voltage at VCC= VDDbetween +2.7V and +5.5V; however, the voltage that supplies the
inductor can vary from +0.8V to +27.5V, depending on circuit operating conditions.
Note 2:The DAC output is set to its midpoint value at power-on.
Note 3:The DAC setting is guaranteed to remain valid as long as VCCis greater than the VCC DAC Reset Threshold.
Note 4:Specifications to -40°C are guaranteed by design, not production tested.
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
__________________________________________Typical Operating Characteristics(Circuits of Figures 1 and 2, VCC= VDD= VIN= +5V, L1 = 22µH, SHDN= VCC, CREF= 0.1µF, TA= +25°C, unless otherwise noted.)
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_____________________________Typical Operating Characteristics (continued)(Circuits of Figures 1 and 2, VCC= VDD= VIN= +5V, L1 = 22µH, SHDN= VCC, CREF= 0.1µF, TA= +25°C, unless otherwise noted.)
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_____________________________Typical Operating Characteristics (continued)
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal SwitchFigure 1. Boost Configuration: Positive Output Voltage
Figure 2. Negative Output Voltage Application Circuit
