MAX1881 Просмотр технического описания (PDF) - Maxim Integrated
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MAX1881 Datasheet PDF : 38 Pages
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Quad-Output TFT LCD DC-DC
Converters with Buffer
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.0V, SHDN = IN, VSUPP = VSUPN = VSUPB = VSUPL = 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =
PGND = GND, CREF = 0.22µF, CBUF = 1µF, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
MAIN STEP-UP CONVERTER
Main Output Voltage Range
FB Regulation Voltage
VMAIN
VFB
Integrator enabled, CINTG = 1000pF
Integrator disabled (INTG = REF)
VIN
13
V
1.234 1.247 1.260
V
1.220
1.280
FB Input Bias Current
Operating Frequency
IFB
fOSC
VFB = 1.25V, INTG = GND
MAX1778/MAX1880/MAX1883
MAX1881/MAX1882/MAX1884/MAX1885
-50
+50
nA
0.85
1
1.15 MHz
425
500
575
kHz
Oscillator Maximum Duty
Cycle
80
85
91
%
Load Regulation
ILX = 0 to 200mA,
VMAIN = 10V
Integrator enabled,
CINTG = 1000pF
Integrator disabled
(INTG = REF)
0.01
%
0.2
Line Regulation
Integrator Transconductance
LX Switch On-Resistance
LX Leakage Current
RLX(ON)
ILX
ILX = 100mA
VLX = 13V
LX Current Limit
Phase I = soft-start (1024/fOSC)
ILIM
Phase II = soft-start (1024/fOSC)
Phase III = soft-start (1024/fOSC)
Phase IV = fully-on (after 3072/fOSC)
Maximum RMS LX Current
Soft-Start Period
tSS
Power-up to the end of Phase III
FB Fault Trip Level
Falling edge, FLTSET = GND
Falling edge, FLTSET = 1V
POSITIVE CHARGE PUMP (MAX1778/MAX1880/MAX1881/MAX1882 ONLY)
SUPP Input Supply Range
VSUPP
Operating Frequency
FBP Regulation Voltage
FBP Input Bias Current
fCHP
VFBP
IFBP
VFBP = 1.5V
DRVP PCH On-Resistance
DRVP NCH On-Resistance
Maximum RMS DRVP Current
RPCH(ON)
RNCH(ON)
VFBP = 1.2V
VFBP = 1.3V
FBP Power-Ready Trip Level
Rising edge
FBP Fault Trip Level
Falling edge, FLTSET = GND
Falling edge, FLTSET = 1V
0.1
%/V
317
µs
0.35 0.7
Ω
0.01
20
µA
0.275 0.38 0.5
0.75
A
1.12
1.15
1.5
1.85
1
A
3072 / fOSC
s
1.07
1.1
1.14
V
0.955 0.99 1.025
2.7
13
V
0.5 x fOSC
Hz
1.2
1.25
1.3
V
-50
+50
nA
5
10
Ω
2
4
Ω
20
kΩ
0.1
A
1.09 1.125 1.16
V
1.08 1.11 1.16
V
0.955 0.99 1.025
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