MAX686 datasheet(2/16 Pages) MAXIM

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DAC-Controlled Boost/Inverter

LCD Bias Supply with Internal Switch

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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, VDD to 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, LCDON to 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

SHDN = GND

POL = GND, VFB = 1.3V, IDACOUT = 0mA

Boost configuration, VOUT = 27.5V,

ILOAD = 0mA to 5mA

Boost configuration, VOUT = 27.5V,

ILOAD = 5mA, VCC = VDD = 2.7V to 5.5V

Rising or falling

CONDITIONS

µA

1.3

ISHDN

Shutdown Current

µA

125

ICC + IDD

2.7

5.5

VCC, VDD

Supply Voltage (Note 1)

Supply Current

VLX

LX Voltage Range

%/mA

0.01

Load Regulation

%/V

0.1

Line Regulation

2.10

2.5

2.65

VLOCK

VCC Undervoltage Lockout

100

VCC Undervoltage Lockout

Hysteresis

0.5

1.5

2.1

VRESET

VCC DAC Reset Threshold

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

ISET = VCC

0.42

0.50

0.58

ILX

LX Switch Current Limit

ISET = GND

0.21

0.25

0.29

VLX = 28V

µA

1.5

ILXLEAK

LX Leakage Current

VCC = VDD = 5V, ILX = 100mA

Ω

0.6

1.2

RLX

LX On-Resistance

VCC = VDD = 3.3V, ILX = 100mA

0.8

1.6

µs

tON

Maximum LX On-Time

POL = GND, VFB > 1.2V

µs

0.8

1.2

tOFF

Minimum LX Off-Time

POL = VCC, VFB < 0.15V

2.8

3.5

4.2

POL = GND, VFB < 0.8V

POL = VCC, VFB > 0.4V

Voltage applied to L1

0.8

VOUT

VIN

Input Voltage

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