Rainbow Electronics MAX17480 - Manual (Page 4)

MAX17480
AMD 2-/3-Output Mobile Serial
VID Controller
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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, V IN = 12V, V CC = V DD = V IN3 = SHDN = PGD_IN = 5V, V DDIO = 1.8V, OPTION = GNDS_ = AGND = PGND,
FBDC_ = FBAC_ = OUT3 = CSP_ = CSN_ = 1.2V, all DAC codes set to the 1.2V code, 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
Combined-Mode Detection
Threshold GNDS1, GNDS2, detection after REFOK,
latched, cleared by cycling
SHDN
0.7 0.8 0.9 V
Maximum Duty Factor D MAX 90 92 %
Minimum On-Time t ONMIN 150 ns
SMPS1 AND SMPS2 CURRENT LIMIT
Current-Limit Threshold
Tolerance
V LIMIT
V CSP _ - V CSN _ = 0.052 x (V REF - V ILIM ),
(V REF - V ILM ) = 0.2V to 1.0V
-3 +3 mV
Zero-Crossing Threshold V ZX V GND _ - V LX _, skip mode 1 mV
Idle Mode™ Threshold V IMIN V CSP _ - V CSN _, skip mode, 0.15 x V LIMIT -2 +2 mV
CS_ Input Leakage Current CSP_ and CSN_, T A = +25°C -0.2 +0.2 µA
CS_ Common-Mode Input Range CSP_ and CSN_ 0 2 V
SMPS1 AND SMPS2 DROOP, CURRENT BALANCE, AND TRANSIENT RESPONSE
AC Droop and Current Balance
Amplifier Transconductance
G m(FBAC _ )
I FBAC _/( V CS _), V FBAC _ = V CSN _ = 1.2V,
V CSP _ - V CSN _ = 0 to +40mV
1.94 2.00 2.06 mS
AC Droop and Current Balance
Amplifier Offset
I FBAC _/G m(FBAC _ ) -1.5 +1.5 mV
No-Load Positive Offset OPTION = 2V or GND +12.5 mV
Transient Detection Threshold
Measured at FBDC_ with respect to
steady-state FBDC_ regulation voltage,
10mV hysteresis (typ)
-47 -41 -33 mV
SMPS3 INTERNAL 4A STEP-DOWN CONVERTER
OUT3 Load Regulation R DROOP3 4 5.5 7 mV/A
OUT3 Line Regulation 0 to 100% duty cycle 5 mV
OUT3 Input Current I OUT3 T A = +25°C -100 -5 +100 nA
LX3 Leakage Current I LX3
SHDN = GND, V
LX3 = GND or 5.5V,
V IN3 = 5.5V, T A = +25°C
-20 +20 µA
R ON(NH3) High-side n-channel 75 150
Internal MOSFET On-Resistance
R ON(NL3) Low-side n-channel 40 75
m
ILIM3 = V CC 4.75 5.25 6
LX3 Peak Current Limit I LX3PK
ILIM3 = GND 3.75 4.25 5
A
LX3 Idle-Mode Trip Level I LX3MIN Percentage of I LX3PK 25 %
LX3 Zero-Crossing Trip Level I ZX3 Skip mode 20 mA
Maximum Duty Factor D MAX 84 87 %
Minimum On-Time t ONMIN 150 ns
Idle Mode is a trademark of Maxim Integrated Products, Inc.