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MAX8798 Datasheet(PDF) 2 Page - Maxim Integrated Products

Part # MAX8798
Description  Internal-Switch Boost Regulator with Integrated 3-Channel Scan Driver for TFT LCDs
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8798 Datasheet(HTML) 2 Page - Maxim Integrated Products

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Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = VDD = VSHDN = +3V, circuit of Figure 2, BOOST = 8V, GON = 23V, GOFF = -12V, VPOS = 0V, VNEG = 1.5V, OE = CPV = STV =
OECON = 0V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°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.
IN, VL, SHDN to AGND .........................................-0.3V to +7.5V
VDD, SDA, SCL, SCLS, WPN, WPP, SET to GND...-0.3V to +4.0V
OECON, CPV, OE, STV to AGND..........................-0.3V to +4.0V
COMP, FB to AGND ......................................-0.3V to (VL + 0.3V)
DISH to GND ............................................................-6V to +0.3V
LX to PGND ............................................................-0.3V to +20V
OUT, VCOM, NEG, POS to BGND........-0.3V to (BOOST + 0.3V)
PGND, BGND, AGND to GND...............................-0.3V to +0.3V
GON to AGND ........................................................-0.3V to +40V
GOFF to AGND .............................................-30V to (VIN + 0.3V)
BOOST to BGND ....................................................-0.3V to +20V
CKV, CKVB, STVP, CKVCS,
CKVBCS to AGND..................(GOFF - 0.3V) to (GON + 0.3V)
LX, PGND RMS Current Rating.............................................2.4A
Continuous Power Dissipation (TA = +70°C)
NiPd Lead Frame with Nonconductive Epoxy
36-Pin, 6mm x 6mm Thin QFN
(derate 27.2mW/°C above +70°C) .........................2179.8mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VDD Input Voltage Range
1.8
4.0
V
VDD Quiescent Current
VDD = 3V
4
10
μA
VDD Undervoltage Lockout
VDD rising; typical hysteresis 100mV
1.3
1.75
V
IN Input Voltage Range
(Note 1)
1.8
6.0
V
IN Quiescent Current
VIN = 3V, VFB = 1.5V, not switching
0.04
0.1
mA
IN Undervoltage Lockout
IN rising; typical hysteresis 100mV
1.4
1.75
V
Thermal Shutdown
Rising edge, hysteresis = 15
oC
160
oC
BOOTSTRAP LINEAR REGULATOR (VL)
VL Output Voltage
IVL = 100μA
3.15
3.3
3.45
V
VL Undervoltage Lockout
VL rising, typical hysteresis 200mV
2.4
2.7
3.0
V
VL Maximum Output Current
VFB = 1.1V
10
mA
MAIN DC-DC CONVERTER
LX not switching, no load on VL
1.5
2
BOOST Supply Current
LX switching, no load on VL
3
4
mA
Operating Frequency
990
1170
1350
kHz
Oscillator Maximum Duty Cycle
88
92
96
%
FB Regulation Voltage
1.216
1.235
1.254
V
FB Load Regulation
0 < ILOAD < 200mA, transient only
-1
%
FB Line Regulation
VIN = 1.8V to 5.5V, FB to COMP
-0.15
-0.08
+0.15
%/V
FB Input Bias Current
VFB = 1.25V
50
125
200
nA
FB Transconductance
I = 5μA at COMP
70
160
280
μS
FB Voltage Gain
FB to COMP
2400
V/V
FB Fault Timer Trip Threshold
Falling edge
0.96
1
1.04
V
LX On-Resistance
ILX = 1.2A
150
300
m
LX Leakage Current
VLX = 18V
0.01
20
μA
LX Current Limit
Duty cycle = 65%
1.6
1.9
2.2
A
Current-Sense Transresistance
0.25
0.42
0.55
V/A
Soft-Start Period
3
ms


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