Datasheet

Multi-Output Power Supplies with VCOM Amplifier
and High-Voltage Gamma Reference for LCD TVs
MAX17126/MAX17126A
10 _____________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
INVL
= V
IN2
= 12V, V
VOP
= V
VREF_I
= 15V, T
A
= -40NC to +85NC.) (Note 3)
Note 1: When the step-down inductor is in continuous conduction (EN = VL or heavy load), the output voltage has a DC regulation
level lower than the error comparator threshold by 50% of the output voltage ripple. In discontinuous conduction (EN = GND
with light load), the output voltage has a DC regulation level higher than the error comparator threshold by 50% of the output
voltage ripple.
Note 2: Disables boost switching if either GD_I or VOP exceeds the threshold. Switching resumes when no threshold is exceeded.
Note 3: Specifications to T
A
= -40NC are guaranteed by design, not production tested.
PARAMETER CONDITIONS MIN TYP MAX UNITS
GAMMA REFERENCE
VREF_I Input Voltage Range 10 18.0 V
VREF_I Undervoltage Lockout VREF_I rising 5.2 V
VREF_I Input Bias Current No load 250
FA
VREF_O Dropout Voltage I
VREF_O
= 60mA 0.5 V
VREF_FB Regulation Voltage
V
REF_I
= 13.5V, 1mA ≤ I
VREF_O
≤ 30mA 1.2375 1.2625 V
V
REF_I
from 10V to 18V, I
VREF_O
= 20mA
P 0.9
mV/V
VREF_O Maximum
Output Current
60 mA
PGOOD FUNCTION
VDET Threshold VDET rising 1.274 1.326 V
PGOOD Output Voltage VDET = AGND, I
PGOOD
= 1mA 0.4 V
FAULT DETECTION
Step-Up Short-Circuit
Protection
FB1 falling edge
0.36 x
V
REF
0.44 x
V
REF
V
Step-Down Short-Circuit
Protection
Adjustable mode FB2 falling
0.18 x
V
REF
0.22 x
V
REF
V
Fixed mode OUT falling, internal feedback divider
voltage
0.18 x
V
REF
0.22 x
V
REF
V
Positive Charge-Pump
Short-Circuit Protection
FBP falling edge
0.36 x
V
REF
0.44 x
V
REF
V
Negative Charge-Pump
Short-Circuit Protection
V
REF
- V
FBN
0.4 0.5 V
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage 500kHz 0.6 V
FSEL Input High Voltage 750kHz 1.6 V