Electrical characteristics (continued) – Rainbow Electronics MAX8760 User Manual
Page 4
MAX8760
Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
SKIP
= V
S0
= V
S1
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS =
SUS = GNDS = D0–D5 = GND, T
A
= 0°C to +85°C, unless otherwise specified. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Undervoltage Fault and
VROK Transition Blanking Time
t
BLANK
Measured from the time when FB reaches
the voltage set by the DAC code; clock
speed set by R
TIME
(Note 4)
24
Clks
VROK Startup Delay
Measured from the time when FB first
reaches the voltage set by the DAC code
after startup
3
5
7
ms
VROK Delay
t
VROK
FB forced 2% outside the VROK trip
threshold
10
µs
VROK Output Low Voltage
I
SINK
= 3mA
0.4
V
VROK Leakage Current
High state, VROK forced to 5.5V
1
µA
V
CC
Undervoltage Lockout
Threshold
V
UVLO(VCC)
Rising edge, hysteresis = 90mV, PWM
disabled below this level
4.0
4.25
4.4
V
Thermal-Shutdown Threshold
T
SHDN
Hysteresis = 10°C
+160
°C
CURRENT LIMIT AND BALANCE
Current-Limit Threshold Voltage
(Positive, Default)
V
LIMIT
CMP - CMN, CSP - CSN; ILIM = V
CC
28
30
32
mV
V
ILIM
= 0.2V
8
10
12
Current-Limit Threshold Voltage
(Positive, Adjustable)
V
LIMIT
CMP - CMN, CSP - CSN
V
ILIM
= 1.5V
73
75
77
mV
Current-Limit Threshold Voltage
(Negative)
V
LIMIT(NEG)
CMP - CMN, CSP - CSN; ILIM = V
CC
,
SKIP = V
CC
-41
-36
-31
mV
Current-Limit Threshold Voltage
(Zero Crossing)
V
ZERO
CMP - CMN, CSP - CSN; SKIP = GND
1.5
mV
CMP, CMN, CSP, CSN Input
Ranges
0
2
V
CMP, CMN, CSP, CSN Input
Current
V
CSP
= V
CSN
= 0 to 5V
-2
+2
µA
Secondary Driver-Disable
Threshold
V
CSP
3
V
CC
- 1
V
CC
-
0.4
V
ILIM Input Current
I
ILIM
V
ILIM
= 0 to 5V
0.1
200
nA
Current-Limit Default Switchover
Threshold
V
ILIM
3
V
CC
- 1
V
CC
-
0.4
V
Current-Balance Offset
V
OS(IBAL)
(V
CMP
- V
CMN
) - (V
CSP
- V
CSN
); I
CCI
= 0,
-20mV < (V
CMP
- V
CMN
) < 20mV,
1.0V < V
CCI
< 2.0V
-2
+2
mV