Datasheet

Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17126/MAX17126A
8 ______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
INVL
= V
IN2
= 12V, V
VOP
= V
VREF_I
= 15V, T
A
= -40NC to +85NC.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
STEP-UP REGULATOR
Output-Voltage Range VIN 20 V
Oscillator Maximum Duty Cycle 70 85 %
FB1 Regulation Voltage FB1 = COMP, C
COMP
= 1nF 1.2375 1.2625 V
FB1 Fault Trip Level Falling edge 0.96 1.04 V
FB1 Transconductance
DI = Q2.5FA at COMP, FB1 = COMP
150 560
FS
LX1 Input Bias Current V
FB1
= 1.5V, V
LX1
= 20V 40
FA
LX1 Current Limit
V
FB1
= 1.1V, R
CLIM
= unconnected 3.6 4.8
A
V
FB1
= 1.1V , with R
CLIM
at CLIM pin, limit = 3.5A -
(60.5K/R
CLIM
)
-20% +20%
CLIM Voltage
R
CLIM
= 60.5kI
0.56 0.69 V
Current-Sense Transresistance 0.19 0.25 V/A
LX1 On-Resistance 185
mI
SS Charge Current V
SS
= 1.2V 4 6
FA
POSITIVE CHARGE-PUMP REGULATORS
GD_I Input Supply Range 8.0 20 V
GD_I Input Supply Current V
FBP
= 1.5V (not switching) 0.2 mA
GD_I Overvoltage Threshold GD_I rising, 250mV typical hysteresis (Note 2) 20.1 22 V
FBP Regulation Voltage 1.243 1.256 V
FBP Line Regulation Error V
SUP
= 11V to 16V, not in dropout 0.2
%/V
DRVP p-Channel MOSFET
On-Resistance
3
I
DRVP n-Channel MOSFET
On-Resistance
1
I
FBP Fault Trip Level Falling edge 0.96 1.04 V
NEGATIVE CHARGE-PUMP REGULATORS
FBN Regulation Voltage V
REF
- V
FBN
0.99 1.01 V
FBN Line Regulation Error V
IN2
= 11V to 16V, not in dropout 0.2
%/V
DRVN P
CH
On-Resistance 3
I
DRVN N
CH
On-Resistance 1
I
FBN Fault Trip Level Rising edge 720 880 mV
AVDD SWITCH GATE CONTROL
GD Output Sink Current EN = VL 5 15
FA
GD Done Threshold EN = VL, VGD_I - VGD 5 7 V