MAX749 datasheet(2/12 Pages) MAXIM

2 / 12 page

TA = TMIN to TMAX

MIN

MAX

125

300

Digitally Adjustable LCD Bias Supply

______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

V+ ................................................................................-0.3V, +7V

CTRL, ADJ, FB, DLOW, DHI, CS.....................-0.3V, (V+ + 0.3V)

Continuous Power Dissipation (TA = +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 5.88mW/°C above +70°C) .........................471mW

Operating Temperature Ranges:

MAX749C_A........................................................0°C to +70°C

MAX749E_A .....................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

ELECTRICAL CHARACTERISTICS

(2V < V+ < 6V, TA = TMIN to TMAX, unless otherwise noted.)

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.

Note 1: The device is in regulation when VFB = 0V (see Figures 3 - 6).

Note 2: These tests performed at V+ = 3.3V. Operation over supply range is guaranteed by supply rejection test of full-count current.

Note 3: VIH is guaranteed by design to be 1.8V min for V+ = 2V to 6V for TA = TMIN to TMAX. VIL is guaranteed by design from

TA = TMIN to TMAX.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

V+ Voltage

FB Source Current

IFBS

On power-up or reset, VFB = 0V (Note 1)

12.80

13.33

13.86

µA

Zero-Count FB Current

VFB = 0V

0.45

0.55

IFBS

Full-Count FB Current

VFB = 0V

1.43

1.53

IFBS

DAC Step Size (Note 2)

Monotonicity guaranteed, VFB = 0V

1.00

1.56

2.12

%IFBS

DAC Linearity (Note 2)

VFB = 0V

±1

%IFBS

Supply Rejection

V+ = 2V to 6V, full-count current

1.5

%IFBS

Switching Frequency

100 to 500

kHz

Logic Input Current

0V < VIN < V+, CTRL, ADJ

±100

Logic High Threshold (Note 3)

VIH

CTRL, ADJ

1.6

Quiescent Current

µA

Shutdown Current

µA

V+ to CS Voltage

Current-limit trip voltage

110

140

180

DHI Source Current

V+ = 2V, VDHI = 1V

DHI Drive Level

No load

V+ - 50mV

V+

DLOW On Resistance

V+ = 2V, VDLOW = 0.5V

510

Ω

Logic Low Threshold (Note 3)

VIL

CTRL, ADJ

0.4

TIMING CHARACTERISTICS

TA = +25°C

MIN

TYP

MAX

PARAMETER

SYMBOL

CONDITIONS

UNITS

Minimum Reset Pulse Width

V+ = 5V

100

Minimum Reset Setup

tRS

Minimum Reset Hold

tRH

Not tested

tSH

V+ = 2V

100

Minimum ADJ High Pulse Width

V+ = 5V

100

tSL

V+ = 2V

170

400

500

Minimum ADJ Low Pulse Width

V+ = 5V

150

200

Minimum ADJ Low to CTRL Low

tSD

V+ = 2V

200

250

V+ = 5V

100

V+ = 2V

400

Not tested

FB Offset Voltage

±15

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