MAX16928_12 Datasheet, PDF (3/20 Pages) Maxim Integrated Products – Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators

MAX16928
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V_INA = 5V, V_GND = V_PGNDP = 0V, T_A = T_J = -40NC to +105NC, typical values are at T_A = +25NC unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
BOOST CONVERTER
Switching Frequency
f_SW
Maximum Duty Cycle
1.98 2.20 2.42
82
93.5
MHz
%
LXP Current Limit
I_LIM
Low boost current-
Duty cycle = 70%, ^{limit option}
0.625
0.78
C_COMPI = 220pF
High boost current-
limit option
1.25
1.56
1.87
A
LXP On-Resistance
LXP Leakage Current
Soft-Start Time
R_{DS_ON(LXP)} I_LXP = 200mA
I_{LK_LXP} V_LXP = 20V, T_A =+25NC
(Note 3)
110 250
mI
8.5
20
FA
30
ms
Output Voltage Range
FBP Regulation Voltage
V_SH
V_FBP
V_INA = +3V to +5.5V,
0 < I_LOAD < full load
T_A = +25NC
T_A = -40NC to
+105NC
V_INA
18
V
0.985 1.0 1.015
V
0.98 1.0 1.02
PGOOD Threshold
FBP Load Regulation
FBP Line Regulation
FBP Input Bias Current
FBP to COMPV
Transconductance
V_{PG_FBP}
Measured at FBP
0 < I_LOAD < full load
V_INA = +3V to +5.5V
V_FBP = +1V, T_A = +25NC
DI = Q2.5FA at COMPV, T_A = +25NC
0.74 0.85 0.96
V
-1
%
0.1
%/V
Q1
FA
400
FS
POSITIVE-GATE VOLTAGE REGULATOR (GH)
Output Voltage Range
CP Overvoltage Threshold
FBGH Regulation Voltage
PGOOD Threshold
FBGH Load Regulation
FBGH Line Regulation
FBGH Input Bias Current
GH Output Current
GH Current Limit
GH Soft-Start Time
V_GH
V_FBGH
V_{PG_FBGH}
I_GH
I_{LIM_GH}
With external charge pump, T_A = +25NC
(maximum V_CP = 29.5V)
T_A = +25NC (Note 4)
I_GH = 1mA
Measured at FBGH
I_GH = 0 to 20mA
V_CP = 12V to 20V at V_GH = 10V,
I_GH = 10mA
V_FBGH = 1V, T_A = +25NC
V_CP - V_GH = 2V
5
29
V
29.5 30.5
V
0.96 1.0 1.034
V
0.83 0.85 0.87
V
2
%
2
%
Q1
FA
20
mA
35
56
mA
7.45
ms
NEGATIVE-GATE VOLTAGE REGULATOR (GL)
Output Voltage Range
FBGL Regulation Voltage
PGOOD Threshold
V_DRVN
V_FBGL
V_{PG_FBGL}
I_DRVN = 100FA
Measured at FBGL
-24
-2
V
0.212 0.242 0.271
V
0.38 0.4 0.42
V
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