ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
MAX1729
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
LX, PS, OUT to GND...............................................-0.3V to +20V
CTLIN, FB, REF, COMP, TC to GND ...........-0.3V to (V
IN
+ 0.3V)
LX to PS ..................................................................-20V to +1.0V
LX, PS, OUT Current ...........................................................60mA
Continuous Power Dissipation (T
A
= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°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
(V
IN
= +3V, CTLIN = IN, FB = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Undervoltage Lockout
Threshold (Note 2)
IN Supply Current
PS Supply Current
Shutdown Supply Current
Reference Output Voltage
SYMBOL
V
IN
V
LO
I
IN
I
PS
I
SHDN
V
REF
V
OUT
(MIN)
CONDITIONS
MIN
2.7
2.0
TYP
MAX
5.5
2.6
UNITS
V
V
µA
µA
µA
V
37
30
CTLIN = GND, I
SHDN
= I
IN
+ I
PS
I
REF
= 0
FB = GND, CTLIN =
0.1% duty cycle,
I
OUT
= 0 to 0.5mA
I
OUT
= 0 to 0.5mA
FB = GND, CTLIN =
0.1% to 100% duty
cycle, I
OUT
= 0
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
0.5
T
A
= +25°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
V
FB
= +1.25V
V
IN
= +5.5V
V
IN
= +2.7V
2
1.3
1.178
15.5
14.5
±50
1.215
1.200
90
122
5
1.228
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
1.215
1.200
2.35
2.35
16
13.90
13.60
±11
±18
2.5
1.228
16.5
16.5
16.40
13.95
2.45
0.4
1.228
50
40
2
1.241
1.256
2.5
Minimum Output Voltage
V
2.52
V
14.00
V/100%
14.20
±30
±65
1.278
17.5
18.5
1.241
1.256
150
50
ppm/°C
mA
V
mV/°C
µA
V
mV
nA
V
Maximum Output Voltage
V
OUT
(MAX)
CTLIN to V
OUT
Gain
Output Voltage
Temperature Coefficient
Maximum Output Current
TC Output Voltage
TC Output Temperature
Coefficient (Note 3)
TC Output Current
Feedback Set Voltage (FB)
FB Mode Threshold
FB Bias Current
CTLIN High Voltage
TC
OUT
I
OUT
V
TC
TC
TC
I
TC
V
FB
V
MODE
I
FB
V
IH
V
PS
= +18V (Note 3)
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
