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AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, V IN = 12V, V CC = V DD1 = V DD2 = SHDN = PGD_IN = 5V, V DDIO = 1.8V, PRO = OPTION = GNDS_NB = GNDS_ =
GND_, FBDC_ = FBAC_ = 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
MAIN SMPS CONTROLLERS
DAC codes from 0.8375V to 1.5500V
-0.4
+0.4
%
DC Output-Voltage Accuracy
(Note 1)
DC Load Regulation
Line-Regulation Error
GNDS_ Input Range
V OUT
V GNDS_
DAC codes from 0.5000V to 0.8250V
DAC codes below 0.4875V
Either SMPS, PWM mode, droop disabled,
zero to full load
Either SMPS, 4V < V IN < 26V
Separate mode
-4
-10
-200
-0.1
0.03
+4
+10
+200
mV
%
%/V
mV
Separate: Δ V OUT _/ Δ V GNDS _ ,
GNDS_ Gain
A GNDS_
-200mV ≤ V GNDS _ ≤ +200mV;
combined: Δ V OUT / Δ V GNDS1,
0.95
1.00
1.05
V/V
-200mV ≤ V GNDS1 ≤ +200mV
GNDS_ Input Bias Current
I GNDS _
-2
+2
μA
Combined-Mode Detection
Threshold
GNDS2, detection after REFOK, latched,
cleared by cycling SHDN
0.7
0.8
0.9
V
FBDC_ Input Bias Current
I FBDC0 _
CSP_ = CSN_
-3
+3
μA
R OSC = 143k Ω (f OSC = 300kHz nominal)
-5
+5
Switching-Frequency Accuracy
Maximum Duty Factor
f OSC
D MAX
R OSC = 35.7k Ω (f OSC = 1.2MHz nominal) to
432k Ω (f OSC = 99kHz nominal)
-7.5
90
92
+7.5
%
%
Minimum On-Time
SMPS1-to-SMPS2 Phase Shift
t ONMIN
SMPS2 starts after SMPS1
50
180
175
ns
%
Degrees
TIME Slew-Rate Accuracy
During
transition
R TIME = 143k Ω , SR = 6.25mV/μs
R TIME = 35.7k Ω to 357k Ω ,
SR = 25mV/μs to 2.5mV/μs
-10
-15
+10
+15
%
CURRENT LIMIT
Startup and shutdown
1
mV/μS
Current-Limit Threshold Tolerance
Zero-Crossing Threshold
Idle Mode? Threshold Tolerance
CS_ Input-Leakage Current
CS_ Common-Mode Input Range
V LIMIT
V ZX
V IDLE
V CSP _ - V CSN _ = 0.05 x (V REF - V ILIM ),
(V REF - V ILM ) = 0.2V to 1.0V
V GND _ - V LX _, SKIP mode
V CSP _ - V CSN _, SKIP mode, 0.15 x V LIMIT
CSP_ and CSN_
CSP_ and CSN_
-3
-1.5
-0.2
0
3
+3
+1.5
+0.2
2
mV
mV
mV
μA
V
Phase-Disable Threshold
CSP2
3
V CC
-1
V CC
-0.4
V
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
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