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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1729 Datasheet

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation

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MAX1729 pdf
19-1406; Rev 1; 1/99
FOLELVOAWLUSADTAIOTNA
KIT
SHEET
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
General Description
The MAX1729 micropower step-up/step-down DC-DC
converter is ideally suited for electrically controlled bire-
fringence (ECB) and liquid-crystal-display (LCD) bias-
supply generation. It provides step-up/step-down
voltage conversion and reduces output ripple by using
a step-up DC-DC converter followed by a linear regula-
tor. This architecture permits a physically smaller induc-
tor than those used in competing SEPIC and flyback
topologies. This device features low quiescent current
(67µA typical). A logic-controlled shutdown mode fur-
ther reduces quiescent current to 0.4µA typical.
The MAX1729 features an input that dynamically
adjusts the output voltage to control display color or
contrast. It offers two feedback modes: internal and
external. Internal feedback mode allows output volt-
ages between 2.5V and 16V, and is specifically
designed to hold temperature drift to ±11ppm/°C.
External feedback mode allows the MAX1729 output
voltage range to be tailored for various displays.
An on-chip temperature sensor with a positive tempera-
ture coefficient provides compensation for LCD/ECB
display temperature characteristics. In internal feed-
back mode, the buffered temperature sensor output is
read and used to adjust the output voltage via a digital
control signal. External feedback mode features an
additional compensation method in which the tempera-
ture output is summed directly into the feedback net-
work to provide first-order negative temperature
compensation of the output voltage. The MAX1729 is
available in the space-saving 10-pin µMAX package.
Applications
ECB Display Bias & Color Adjustment
LCD Display Bias & Contrast Adjustment
Cellular Phones
Personal Digital Assistants
TOP VIEW
Pin Configuration
IN 1
TC 2
REF 3
COMP 4
FB 5
MAX1729
µMAX
10 GND
9 LX
8 PS
7 OUT
6 CTLIN
Features
o High-Accuracy Reference Voltage (±1%)
o ±11ppm/°C Output Voltage Drift
o On-Chip Temperature Sensor Output
o Accurate Voltage and Temperature Provide:
Consistent ECB Colors
Consistent LCD Gray-Scale Contrast
o +2.7V to +5.5V Input Voltage Range
o Output Voltage Range
+2.5V to +16V in Internal Feedback Mode
Programmable in External Feedback Mode
o Dynamic Control of the Output Voltage
o 67µA Supply Current
o 0.4µA Shutdown Current
o 10-Pin µMAX Package (1.09mm max height)
o Evaluation Kit Available (MAX1729EVKIT)
PART
MAX1729EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit
VIN
2.7V to 5.5V
DIGITAL
PWM
CONTROLLER
ADC
IN LX
PS
GND
MAX1729
REF OUT
CTLIN
TC
FB
COMP
VOUT
+2.5V to +16V
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1729 Datasheet

ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation

No Preview Available !

MAX1729 pdf
ECB and LCD Display Bias Supply with Accurate
Output Voltage and Temperature Compensation
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 (VIN + 0.3V)
LX to PS ..................................................................-20V to +1.0V
LX, PS, OUT Current ...........................................................60mA
Continuous Power Dissipation (TA = +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
(VIN = +3V, CTLIN = IN, FB = GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +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
Minimum Output Voltage
Maximum Output Voltage
CTLIN to VOUT 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
SYMBOL
VIN
CONDITIONS
VLO
IIN
IPS
ISHDN
VREF
VOUT
(MIN)
VOUT
(MAX)
TCOUT
IOUT
VTC
TCTC
ITC
VFB
VMODE
IFB
VIH
CTLIN = GND, ISHDN = IIN + IPS
IREF = 0
TA = +25°C
TA = -40°C to +85°C
FB = GND, CTLIN =
0.1% duty cycle,
IOUT = 0 to 0.5mA
TA = 0°C to +85°C
TA = -40°C to +85°C
IOUT = 0 to 0.5mA
FB = GND, CTLIN =
0.1% to 100% duty
cycle, IOUT = 0
VPS = +18V (Note 3)
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = +25°C
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = +25°C
TA = -40°C to +85°C
VFB = +1.25V
VIN = +5.5V
VIN = +2.7V
MIN
2.7
2.0
1.215
1.200
2.35
2.35
TYP
37
30
0.4
1.228
2.45
MAX UNITS
5.5 V
2.6 V
50
40
2
1.241
1.256
2.5
2.52
µA
µA
µA
V
V
16 16.40
V
13.90
13.60
0.5
1.178
15.5
14.5
±50
1.215
1.200
90
2
1.3
13.95
±11
±18
2.5
1.228
16.5
16.5
1.228
122
5
14.00
14.20
±30
±65
1.278
17.5
18.5
1.241
1.256
150
50
V/100%
ppm/°C
mA
V
mV/°C
µA
V
mV
nA
V
2 _______________________________________________________________________________________


Part Number MAX1729
Description ECB and LCD Display Bias Supply with Accurate Output Voltage and Temperature Compensation
Maker Maxim
Total Page 12 Pages
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