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MAX16929
Automotive TFT-LCD Power Supply with Boost
Converter and Gate Voltage Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V INB = 12V, V INA = 5V, V GND = V PGNDP = 0V, T A = T J = -40 N C to +105 N C, typical values are at T A = +25 N C, unless otherwise noted.)
(Note 2)
PARAMETER
PGOOD Threshold
SYMBOL
V PG_FBGL
CONDITIONS
Measured at FBGL
MIN
0.38
T Y P
0.4
MAX
0.42
UNITS
V
FBGL Input Bias Current
DRVN Source Current
V FBGL = +0.25V
V FBGL = +0.5V, V DRVN = -10V
2
Q 1
F A
mA
DRVN Source Current Limit
GL Soft-Start Time
2.5
4
7 .4 5
mA
ms
1.8V/3.3V REGULATOR CONTROLLER
Output Voltage
FB PGOOD Threshold
V FB
V PG_FB
V DR = V FB
Measured at FB
(Notes 5, 7)
3.3V regulator option
1.8V regulator option
3.3V regulator option,
F B rising
1.8V regulator option
3.18
1.746
2.4
1.364
3.3
1.8
2.57
1 .3 8
3.38
1.854
2.7
1.396
V
V
FB Input Bias Current
V FB = 1.8V
V FB = 3.3V
2.5
4.5
F A
DR Drive Current
V FB = 1.8V
4.5
6
mA
INPUT SERIES SWITCH CONTRO L
p-Channel FET GATE Sink Current
GATE Voltage Threshold
V GATE = 0.5V
Measured at GATE; below this voltage, the
external p-channel FET is considered on
33
55
1.25
75
F A
V
DIGITAL LOGIC
ENP, SEQ Input Pulldown Resistor
Value
ENP, SEQ Input-Voltage Low
ENP, SEQ Input-Voltage High
R PD
V IL
V IH
0.7 x V INA
500
0.3 x V INA
k I
V
V
PGOOD Leakage Current
PGOOD Output-Voltage Low
I LK_IN
V OL
T A = +25 N C
2mA sink curren    t, T A = +25 N C
Q 1
0.4
F A
V
Note 2: Specifications over temperature are guaranteed by design and not production tested.
Note 3: Operation in light-load conditions or at extreme duty cycles result in skipped cycles, resulting in lower operating frequency
and possibly limited output accuracy and load response.
Note 4: 50% of the soft-start voltage time is due to the soft-start ramp, and the other 50% is due to the settling of the output voltage.
Note 5: Guaranteed by design; not production tested.
Note 6: After the voltage at CP exceeds this overvoltage threshold, the entire circuit switches off and autoretry is started.
Note 7: FB power good is indicated by PGOOD. The condition V FB < V PG_FB does not shutdown/restart the device.
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