MAX8795A_1106 Datasheet, PDF (2/31 Pages) Maxim Integrated Products – TFT-LCD DC-DC Converter with Operational Amplifiers 2.5V to 5.5V Input Supply Range

TFT-LCD DC-DC Converter with
Operational Amplifiers
ABSOLUTE MAXIMUM RATINGS
IN, CTL to AGND ...................................................-0.3V to +7.5V
COMP, FB, FBP, FBN, DEL, REF to AGND ....-0.3V to (V_IN + 0.3V)
PGND, BGND to AGND ......................................................±0.3V
LX to PGND ............................................................-0.3V to +20V
SUP to AGND .........................................................-0.3V to +20V
DRVP to AGND.......................................................-0.3V to +36V
POS_, NEG_, OUT_ to AGND ...................-0.3V to (V_SUP + 0.3V)
DRVN to AGND ...................................(V_IN - 30V) to (V_IN + 0.3V)
SRC to AGND .........................................................-0.3V to +40V
COM, DRN to AGND ................................-0.3V to (V_SRC + 0.3V)
DRN to COM............................................................-30V to +30V
POS_ to NEG_ RMS Current ...................................5mA (Note 1)
OUT_ Maximum Continuous Output Current....................±75mA
LX Switch Maximum Continuous RMS Current .....................1.6A
Continuous Power Dissipation (T_A = +70°C)
32-Pin Thin QFN (derate 34.5mW/°C above +70°C) 2758mW
32-Pin LQFP (derate 48.4mW/°C above +70°C)....1652.9mW
Operating Temperature Range, E Grade ............-40°C to +85°C
Operating Temperature Range, G Grade .........-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: See Figure 2 for the op amp clamp structure.
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
(V_IN = 3V, V_MAIN = V_SUP = 14V, V_PGND = V_AGND = V_BGND = 0V, I_REF = 25µA, T_A = 0°C to +85°C. Typical values are at T_A = +25°C,
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
IN Supply Range
V_IN
(Note 2)
2.5
6.0
V
IN Undervoltage-Lockout
Threshold
V_UVLO V_IN rising, typical hysteresis = 50mV
2.05 2.25 2.45
V
IN Quiescent Current
V_FB = V_FBP = 1.3V, V_FBN = 0V,
LX not switching
I_IN
V_FB = 1.2V, V_FBP = 1.4V, V_FBN = 0V,
LX switching
0.6
1.0
mA
2
3
Duration-to-Trigger Fault
Condition
REF Output Voltage
REF Load Regulation
REF Sink Current
REF Undervoltage Lockout
Threshold
Thermal Shutdown
MAIN STEP-UP REGULATOR
Output Voltage Range
Operating Frequency
Oscillator Maximum Duty Cycle
FB Regulation Voltage
FB Fault Trip Level
FB Load Regulation
FB Line Regulation
FB Input Bias Current
FB or FBP below threshold or FBN above
threshold
200
ms
No external load
T_A = +25°C to +85°C
1.238 1.250 1.262
V
T_A = 0°C to +85°C
1.232 1.250 1.266
0 < I_LOAD < 50µA
10
mV
In regulation
10
µA
Rising edge; typical hysteresis = 160mV
1.15
V
Temperature rising
Hysteresis
+160
°C
15
V_MAIN
V_IN
18
V
f_OSC
1000 1200 1400 kHz
86
90
93
%
V_FB
No load
T_A = +25°C to +85°C 1.221 1.233 1.245
V
T_A = 0°C to +85°C
1.212 1.233 1.248
V_FB falling
1.10 1.14 1.17
V
0 < I_MAIN < full load, transient only
-1
%
V_IN = 2.5V to 6V
0.1 ±0.4 %/ V
V_FB = 1.233V
+100 +200
nA
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