MAX1519/MAX1545
Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, V
CC
= V
DD
= V
SHDN
= V
TON
= V
SKIP
= V
S0
= V
S1
= V
CODE
= 5V, V
FB
= V
CMP
= V
CMN
= V
CSP
= V
CSN
= 1.3V, OFS = SUS = GNDS = D0–D4 = 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
(Note 4)
t
BLANK
Measured from the time when FB reaches
the voltage set by the DAC code; clock
speed set by R
TIME
24 Clks
VROK Startup Delay
Measured from the time when FB first
reaches the voltage set by the DAC code
after startup
357ms
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
02V
CMP, CMN, CSP, CSN Input
Current
V
CSP
= V
CSN
= 0 to 5V -2 +2 µA
Secondary Driver-Disable
Threshold
V
CSP
3V
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
3V
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
Current-Balance
Transconductance
G
m
IBAL
400 µS
(12 páginas)
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