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MAX1997 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # MAX1997
Description  Quintuple/Triple-Output TFT LCD Power Supplies with Fault Protection and VCOM Buffer
PDF  31 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1997 Datasheet(HTML) 3 Page - Maxim Integrated Products

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Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 3V, VDDB = 10V, SHDN = ONDC = FREQ = IN, CREF = 0.22µF, PGND = GND, TA = 0°C to +85°C.
Typical values are at TA = +25
°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator Maximum Duty Cycle
80
85
90
%
FB Regulation Voltage
ILX = 200mA
1.229
1.242
1.254
V
FB Fault Trip Level
VFB falling
0.96
1.00
1.04
V
FB Load Regulation
IMAIN = 0 to full load
-1.6
%
FB Line Regulation
VIN = 2.7V to 5.5V
0.2
0.4
%/V
FB Input Bias Current
VFB = 1.5V
-100
+100
nA
LX On-Resistance
250
450
m
Ω
LX Leakage Current
VLX = 13V
0.01
20
µA
LX Current Limit
1.6
2.1
2.8
A
LX RMS Current Rating
(Note 2)
1.4
A
Soft-Start Period
4096/fOSC
s
Soft-Start Step Size
VREF/32
V
POSITIVE LINEAR-REGULATOR CONTROLLERS (REG P, REG 1, AND REG 2)
IDRVP = 100µA
IDRV1 = 1350µA (MAX1997 only)
FB_ Regulation Voltage
IDRV2 = 335µA (MAX1997 only)
1.225
1.250
1.275
V
FB_ Fault Trip Level
VFB_ falling
0.96
1.00
1.04
V
FB_ Input Bias Current
VFB_ = 1.25V
-250
+250
nA
VDRVP = 10V, IDRVP = 0.05mA to 1mA
VDRV1 = 10V, IDRV1 = 0.5mA to 5mA
(MAX1997 only)
FB_ Effective Load Regulation Error
(Transconductance)
VDRV2 = 10V, IDRV2 = 0.1mA to 2mA
(MAX1997 only)
-1.5
-2
%
IDRVP = 100µA, 2.7V < VIN < 5.5V
IDRV1 = 1350µA, 2.7V < VIN < 5.5V
(MAX1997 only)
FB_ Line (IN) Regulation Error
IDRV2 = 335µA, 2.7V < VIN < 5.5V
(MAX1997 only)
1
mV
Bandwidth
(Note 2)
1000
kHz
DRVP Sink Current
2
3.3
DRV1 Sink Current (MAX1997 only)
5
18
DRV2 Sink Current (MAX1997 only)
VFB_ = 1.1V, VDRV_ = 10V
5
15
mA
DRV_ Leakage Current
VFB_ = 1.5V, VDRV_ = 28V
0.1
10
µA
Soft-Start Period
4096/fOSC
s
Soft-Start Step Size
VREF/32
V
NEGATIVE LINEAR-REGULATOR CONTROLLER (REG N)
FBN Regulation Voltage
IDRVN = 100µA
95
125
155
mV
FBN Fault Trip Level
VFBN rising
325
370
475
mV
FBN Input Bias Current
VFBN = 0V
-200
+200
nA



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