Manual

MAX8775
Dual and Combinable Graphics Core
Controller for Notebook Computers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, SKIP_ = PGND = AGND, ON_ = V
CC
= 5V, separate mode, T
A
= 0°C to +85°C, unless otherwise
noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PGOOD_ Output Low Voltage I
SINK
= 4mA 0.4 V
PGOOD_ Leakage Current I
PGOOD
_ High state, PGOOD_ forced to 5.5V 1 µA
PGOOD_ Transition Blanking
Time
Measured from the time CSL_ reaches the
target voltage based on the slew rate set by
C
SLEW_
20 µs
Lower threshold,
0.84V
REF
2.0 2.2
Current-Balance Fault
Comparator Thresholds
V(CCI2, REF),
0.5V
≤ V
FB
≤ 2.5V
Upper threshold,
1.2V
REF
2.9 3.0
V
Thermal-Shutdown Threshold T
SHDN
Hysteresis = 15°C +160 °C
GATE DRIVERS
DH_ Gate Driver On-Resistance R
DH
BST_ - LX_ forced to 5V (Note 5) 1.5 5 Ω
DL_, high state 1.7 5
DL_ Gate Driver On-Resistance
(Note 5)
R
DL
DL_, low state 0.6 3
Ω
DH_ Gate Driver Source/
Sink Current
I
DH
DH_ forced to 2.5V, BST_ - LX_ forced to 5V 2 A
DL_ Gate Driver Source Current
I
DL
(
SOURCE
)
DL_ forced to 2.5V 1.7 A
DL_ Gate Driver Sink Current I
DL
(
SINK
)
DL_ forced to 2.5V 3.3 A
DL_ to DH_ 15 35
Dead Time t
DEAD
DH_ to DL_ 10 26
ns
Internal Boost Diode Switch R
ON
Measure with 10mA of current 6.5 9 Ω
LX_, BST_ Leakage Current V
BST
_ = V
LX
_ = 28V < 2 20 µA
INPUTS AND OUTPUTS
Logic Input Current ON1, ON2, DTRANS, SKIP1, SKIP2 -1 +1 µA
Logic Input-High Threshold
ON1, ON2, DTRANS, SKIP1, SKIP2,
hysteresis = 225mV
1.2 1.7 2.2 V
Input Leakage Current CSH_, CSL_, 0V, or V
DD
-0.15 +0.15 µA