MAX8795AETJ-T 查看數據表（PDF） - Maxim Integrated
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MAX8795AETJ-T Datasheet PDF : 31 Pages
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TFT-LCD DC-DC Converter with
Operational Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 3V, VMAIN = VSUP = 14V, VPGND = VAGND = VBGND = 0V, IREF = 25µA, TA = 0°C to +105°C. Typical values are at TA = +25°C,
unless otherwise noted.)
PARAMETER
MAIN STEP-UP REGULATOR
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output Voltage Range
Operating Frequency
Oscillator Maximum Duty Cycle
VMAIN
fOSC
VIN
18
V
1000 1200 1400 kHz
86
90
93
%
FB Regulation Voltage
FB Fault Trip Level
FB Load Regulation
FB Line Regulation
FB Input Bias Current
FB Transconductance
FB Voltage Gain
VFB No load
TA = +25°C to +105°C 1.221 1.233 1.245
V
TA = 0°C to +105°C
1.212 1.233 1.248
VFB falling
1.10 1.14 1.17
V
0 < IMAIN < full load, transient only
-1
VIN = 2.5V to 6V
0.1
±0.4
%/V
VFB = 1.233V
+100 +200
nA
∆ICOMP = ±2.5µA
75
160
280
µS
From FB to COMP
700
V/V
LX On-Resistance
LX Leakage Current
LX Current Limit
Current-Sense Transresistance
RLX(ON)
ILX
ILIM
ILX = 200mA
VLX = 19V
VFB = 1.2V, duty cycle = 75%
160
300
mΩ
10
20
µA
2.5
3.0
3.5
A
0.1
0.2
0.3
V/A
Soft-Start Period
tSS
14
ms
Soft-Start Step Size
VREF /
V
128
OPERATIONAL AMPLIFIERS
SUP Supply Range
SUP Overvoltage Fault Threshold
VSUP
6.0
18.0
V
18.0
19
19.9
SUP Supply Current
ISUP
Buffer configuration, VPOS_ = VSUP / 2,
no load
3.5
5.0
mA
Input Offset Voltage
Input Bias Current
VOS
IBIAS
(VNEG_, VPOS_, VOUT_) ≅ VSUP / 2
(VNEG_, VPOS_, VOUT_) ≅ VSUP / 2
0
12
mV
-50
0
+50
nA
Input Common-Mode Voltage
Range
VCM
0
VSUP
V
Common-Mode Rejection Ratio
Open-Loop Gain
CMRR 0 ≤ (VNEG_, VPOS_) ≤ VSUP
45
80
dB
125
dB
Output Voltage Swing, High
VOH
IOUT_ = 5mA
VSUP - VSUP -
mV
100
50
Output Voltage Swing, Low
Short-Circuit Current
VOL
IOUT_ = -5mA
To VSUP / 2, source or sink
50
100
mV
75
130
mA
Power-Supply Rejection Ratio
Slew Rate
-3dB Bandwidth
PSRR
DC, 6V ≤ VSUP ≤ 18V,
(VNEG_, VPOS_) ≅ VSUP / 2
60
45
RL = 10kΩ, CL = 10pF, buffer configuration
20
dB
V/µs
MHz
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