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MAX1544 View Datasheet(PDF) - Maxim Integrated

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MAX1544 Datasheet PDF : 42 Pages
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Dual-Phase, Quick-PWM Controller for
AMD Hammer CPU Core Power Supplies
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, VCC = VDD = VSHDN = VTON = VSKIP = VS0 = VS1 = VOVP = 5V, VFB = VCMP = VCMN = VCSP = VCSN =
1.3V, OFS = SUS = GNDS = D0D4 = GND; TA = -40°C to +100°C, unless otherwise specified.) (Note 5)
PARAMETER
BIAS AND REFERENCE
SYMBOL
CONDITIONS
MIN
MAX UNITS
Quiescent Supply Current (VCC)
ICC
Measured at VCC, FB forced above the
regulation point, OAIN- = FB, VOAIN+ = 1.3V
3.2
mA
Quiescent Supply Current (VDD)
Quiescent Battery Supply Current
(V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Battery Supply Current
(V+)
Reference Voltage
FAULT PROTECTION
Output Overvoltage Protection
Threshold
IDD
IV+
VREF
VOVP
Measured at VDD, FB forced above the
regulation point
Measured at V+
Measured at VCC, SHDN = GND
Measured at VDD, SHDN = GND
Measured at V+, SHDN = GND,
VCC = VDD = 0 or 5V
VCC = 4.5V to 5.5V, IREF = 0
SKIP = VCC, measured at FB with respect
to unloaded output voltage
1.985
13
20
µA
50
µA
20
µA
20
µA
20
µA
2.015
V
19
%
Output Undervoltage Protection
Threshold
VUVP
Measured at FB with respect to unloaded
output voltage
67
73
%
VROK Threshold
VROK Startup Delay
Measured at FB
Lower threshold
(undervoltage)
-13
with respect to
unloaded output Upper threshold
voltage
(overvoltage)
+7
SKIP = VCC
Measured from the time when FB first
reaches the voltage set by the DAC code
3
after startup
VCC Undervoltage Lockout
Threshold
VUVLO(VCC)
Rising edge, hysteresis = 90mV, PWM
disabled below this level
3.90
CURRENT LIMIT AND BALANCE
-7
%
+13
ms
4.45
V
Current-Limit Threshold Voltage
(Positive, Default)
VLIMIT CMP - CMN, CSP - CSN; ILIM = VCC
27
33
mV
Current-Limit Threshold Voltage
(Positive, Adjustable)
VLIMIT
CMP - CMN,
CSP - CSN
VILIM = 0.2V
VILIM = 1.5V
7
72
Current-Limit Threshold Voltage
(Negative)
VLIMIT(NEG)
CMP - CMN, CSP - CSN; ILIM = VCC,
SKIP = VCC
-30
Current-Balance Offset
GATE DRIVERS
(VCMP - VCMN) - (VCSP - VCSN); ICCI = 0,
VOS(IBAL) -20mV < (VCMP - VCMN) < 20mV,
-3
1.0V < VCCI < 2.0V
DH_ Gate-Driver On-Resistance RON(DH) BST_ - LX_ forced to 5V
13
mV
78
-42
mV
+3
mV
4.5
_______________________________________________________________________________________ 7
 

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