Rainbow Electronics MAX17480 - Manual (Page 8)

MAX17480
AMD 2-/3-Output Mobile Serial
VID Controller
8 _______________________________________________________________________________________
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 = -40°C to +105°C, unless otherwise
noted. Typical values are at T A = +25 °C.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SMPS1 AND SMPS2 CONTROLLERS
GNDS_ Input Range V GNDS_ Separate mode -200 +200 mV
GNDS_ Gain A
GNDS_
Separate: V
OUT
_/ V
GNDS
_
,
-200mV
V
GNDS
_ +200mV; combined;
V OUT / V GNDS_, -200mV V GNDS_ +200mV
0.95 1.05 V/V
Combined-Mode Detection
Threshold GNDS1, GNDS2, detection after REFOK,
latched, cleared by cycling
SHDN
0.7 0.9 V
Maximum Duty Factor D MAX 90 %
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
Idle-Mode Threshold Tolerance V IMIN V CSP _ - V CSN _, skip mode, 0.15 x V LIMIT -2 +2 mV
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 2.06 mS
AC Droop and Current Balance
Amplifier Offset
I FBAC _/G m(FBAC _ ) -1.5 +2.0 mV
Transient Detection Threshold
Measured at FBDC_ with respect to
steady-state FBDC_ regulation voltage,
10mV hysteresis (typ)
-47 -33 mV
SMPS3 INTERNAL 4A STEP-DOWN CONVERTER
OUT3 Load Regulation R DROOP3 4 7 mV/A
R ON(NH3) High-side n-channel 150
Internal MOSFET On-Resistance
R ON(NL3) Low-side n-channel 75
m
LX3 Peak Current Limit I LX3PK ILIM3 = V CC, skip mode 4.75 6 A
Maximum Duty Factor D MAX 84 %
Minimum On-Time t ONMIN 150 ns