MAX749ESA Ver la hoja de datos (PDF) - Maxim Integrated
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MAX749ESA Datasheet PDF : 12 Pages
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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
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.
ELECTRICAL CHARACTERISTICS
(2V < V+ < 6V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V+ Voltage
FB Source Current
Zero-Count FB Current
Full-Count FB Current
FB Offset Voltage
DAC Step Size (Note 2)
DAC Linearity (Note 2)
Supply Rejection
Switching Frequency
2
6
V
IFBS
On power-up or reset, VFB = 0V (Note 1) 12.80
13.33
13.86
µA
VFB = 0V
0.45
0.55
IFBS
VFB = 0V
1.43
1.53
IFBS
±15
mV
Monotonicity guaranteed, VFB = 0V
1.00
1.56
2.12
%IFBS
VFB = 0V
±1
%IFBS
V+ = 2V to 6V, full-count current
1.5
%IFBS
100 to 500
kHz
Logic Input Current
0V < VIN < V+, CTRL, ADJ
±100
nA
Logic High Threshold (Note 3)
VIH
CTRL, ADJ
1.6
V
Logic Low Threshold (Note 3)
VIL
CTRL, ADJ
0.4
V
Quiescent Current
60
µA
Shutdown Current
15
µA
V+ to CS Voltage
Current-limit trip voltage
110
140
180
mV
DHI Source Current
V+ = 2V, VDHI = 1V
24
50
mA
DHI Drive Level
No load
V+ - 50mV V+
V
DLOW On Resistance
V+ = 2V, VDLOW = 0.5V
5
10
Ω
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.
TIMING CHARACTERISTICS
PARAMETER
Minimum Reset Pulse Width
Minimum Reset Setup
Minimum Reset Hold
Minimum ADJ High Pulse Width
Minimum ADJ Low Pulse Width
Minimum ADJ Low to CTRL Low
SYMBOL
CONDITIONS
V+ = 2V
tR
V+ = 5V
tRS
Not tested
tRH
Not tested
V+ = 2V
tSH
V+ = 5V
V+ = 2V
tSL
V+ = 5V
V+ = 2V
tSD
V+ = 5V
TA = +25°C
MIN TYP MAX
125 300
25
85
0
0
15
85
10
85
170 400
60 150
70 200
20
85
TA = TMIN to TMAX
MIN MAX
400
100
0
0
100
100
500
200
250
100
UNITS
ns
ns
ns
ns
ns
ns
2 ______________________________________________________________________________________
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