MAX16929 Datasheet, PDF (5/25 Pages) Maxim Integrated Products – Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators

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 = -40NC to +105NC, typical values are at T_A = +25NC, unless otherwise noted.)
(Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
PGOOD Threshold
FBGL Input Bias Current
DRVN Source Current
DRVN Source Current Limit
V_{PG_FBGL}
Measured at FBGL
V_FBGL = +0.25V
V_FBGL = +0.5V, V_DRVN = -10V
0.38 0.4 0.42
V
Q1
FA
2
mA
2.5
4
mA
GL Soft-Start Time
7.45
ms
1.8V/3.3V REGULATOR CONTROLLER
Output Voltage
V_FB
V_DR = V_FB
3.3V regulator option 3.18 3.3 3.38
V
1.8V regulator option 1.746 1.8 1.854
FB PGOOD Threshold
V_{PG_FB}
3.3V regulator option,
Measured at FB _{FB rising}
(Notes 5, 7)
2.4
2.57
2.7
V
1.8V regulator option 1.364 1.38 1.396
FB Input Bias Current
DR Drive Current
INPUT SERIES SWITCH CONTROL
V_FB = 1.8V
V_FB = 3.3V
V_FB = 1.8V
2.5
FA
4.5
4.5
6
mA
p-Channel FET GATE Sink Current
GATE Voltage Threshold
V_GATE = 0.5V
33
55
75
FA
Measured at GATE; below this voltage, the
external p-channel FET is considered on
1.25
V
DIGITAL LOGIC
ENP, SEQ Input Pulldown Resistor
Value
R_PD
500
kI
ENP, SEQ Input-Voltage Low
ENP, SEQ Input-Voltage High
PGOOD Leakage Current
PGOOD Output-Voltage Low
V_IL
V_IH
I_{LK_IN}
V_OL
T_A = +25NC
2mA sink current, T_A = +25NC
0.7 x V_INA
0.3 x V_INA
V
V
Q1
FA
0.4
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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