Datasheet

Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17126/MAX17126A
_______________________________________________________________________________________ 7
ELECTRICAL CHARACTERISTICS
(V
INVL
= V
IN2
= 12V, V
VOP
= V
VREF_I
= 15V, T
A
= -40NC to +85NC.) (Note 3)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
INVL
= V
IN2
= 12V, V
VOP
= V
VREF_I
= 15V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25NC, unless oth-
erwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage 500kHz 0.6 V
FSEL Input High Voltage 750kHz 1.6 V
FSEL Pullup Resistance 1
MI
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
INVL, IN2 Input-Voltage Range 8 16.5 V
SMPS Operating Frequency
FSEL = INVL or high impedance 630 870
kHz
FSEL = GND 420 580
INVL Undervoltage-Lockout
Threshold
INVL rising, 150mV typical hysteresis 6.0 8.0 V
VL REGULATOR
VL Output Voltage
I
VL
= 25mA, V
FB1
= V
FB2
= V
FB
= 1.1V, V
FBN
= 0.4V
(all regulators switching)
4.85 5.15 V
VL Undervoltage-Lockout
Threshold
VL rising, 50mV typical hysteresis 3.5 4.3 V
REFERENCE
REF Output Voltage No external load 1.235 1.265 V
REF Undervoltage-Lockout
Threshold
Rising edge, 25mV typical hysteresis 1.2 V
STEP-DOWN REGULATOR
OUT Voltage in Fixed Mode FB2 = GND, no load (Note 1) 3.267 3.333 V
FB2 Voltage in Adjustable Mode V
OUT
= 2.5V, no load (Note 1) 1.2375 1.2625 V
FB2 Adjustable Mode
Threshold Voltage
Dual-mode comparator 0.10 0.20 V
Output Voltage Adjust Range 1.5 5 V
FB2 Fault Trip Level Falling edge 0.96 1.04 V
LX2-to-IN2 nMOS Switch
On-Resistance
200
mI
LX2-to-GND2 nMOS Switch
On-Resistance
6 23
I
BST-to-VL pMOS Switch
On-Resistance
40 110
I
LX2 Positive Current Limit
MAX17126 2.50 3.90
A
MAX17126A 3.0 4.0
Maximum Duty Factor 70 85 %