Rainbow Electronics MAX8775 - Manual (Page 5)

MAX8775
Dual and Combinable Graphics Core
Controller for Notebook Computers
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ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V IN = 12V, SKIP_ = 0, ON_ = V
CC = 5V, separate mode, T A = -40°C to +85°C, unless otherwise noted.) (Note 6)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLIES
V IN 4 26
Input Voltage Range
V BIAS V CC , V DD 4.5 5.5
V
V CC Undervoltage Lockout V UVLO Rising edge, 200mV typical hysteresis 4.1 4.5 V
Quiescent Supply Current (V CC ) I CC CSL_ forced above their regulation points 2.5 mA
Quiescent Supply Current (V DD ) I DD CSL_ forced above their regulation points 5 µA
Shutdown Supply Current (V
CC
) ON1 = ON2 = GND 5 µA
Shutdown Supply Current (V DD ) ON1 = ON2 = GND 5 µA
MAIN SMPS CONTROLLERS
PWM_ Output Voltage
V REFIN_ -
V CSL_
With respect to REFIN_,
REFIN_ = 0.5V to 2.5V,
SKIP_ = V
CC
or GND (Note 1)
-7.5 +7.5 mV
Output Voltage Adjust Range V CSL_ Either SMPS (Note 2) 0.5 2.5 V
REFIN Operating Voltage Adjust
Range
V
REFIN_
Either SMPS (Note 2) 0.5 2.5 V
Combined Mode Enabled V REFIN2 3 V
R OSC = 143k Ω (f
OSC = 300kHz nominal) -15 +15
Switching Frequency Accuracy
(Note 2)
f OSC R OSC = 71.5k Ω (f
OSC = 600kHz nominal) to
432k Ω (f
OSC
= 99kHz nominal)
-20 +20
%
Maximum Duty Factor D MAX 90 %
I SLEW_ During transition 3.75 5.50
Slew-Rate Current
I SLEWSS_ Startup and shutdown 0.7 1.2
µA
CURRENT LIMIT
Current-Limit Threshold V LIMIT V CSH _ - V CSL _ 25 35 mV
REFERENCE (REF)
Reference Voltage V REF V CC = 4.5V to 5.5V, I REF = 0 2.462 2.538 V
Refer ence S our ce Load Reg ul ati on ΔV
REF I REF = 0µA to 250µA 2 mV
Reference Sink Load Regulation I REF = -50µA 10 mV
CURRENT BALANCE
Current-Balance Amplifier (GMI)
Offset
[V(CSH1,CSL1) - V(CSH2,CSL2)] at I CCI = 0 -3 +3 mV