MAX8745 查看數據表（PDF） - Maxim Integrated
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MAX8745
Maxim Integrated
MAX8745 Datasheet PDF : 36 Pages
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High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, both SMPS enabled, FSEL = REF, SKIP = GND, ILIM = LDO5, FBA = LDO5, IREF = ILDO5 = IOUTA =
no load, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Soft-Start Ramp Time
tSSTART
Measured from the rising edge of ON_ to
full scale
2
ms
Soft-Stop Ramp Time
tSSTOP
Measured from the falling edge of ON_ to
full scale
4
ms
INTERNAL FIXED LINEAR REGULATORS
LDO5 Output Voltage
VLDO5
ON5 = GND, 6V < VIN < 26V,
0 < ILDO5 < 100mA
4.85 4.95 5.10
V
LDO5 Undervoltage-Lockout Fault
Threshold
LDO5 Bootstrap Switch Threshold
LDO5 Bootstrap Switch Resistance
Short-Circuit Current
Rising edge, hysteresis = 1% (typ)
225
450
mA
Rising edge of CSL5, hysteresis = 1% (typ) 4.35 4.55 4.70
V
LDO5 to CSL5, VCSL5 = 5V, ILDO5 = 50mA
1
5
Ω
LDO5 = GND, ON5 = GND
225
450
mA
Short-Circuit Current (Switched
Over to CSL_)
LDO5 = GND, VCSL5 > 4.7V
200 425
mA
AUXILIARY LINEAR REGULATOR
DRVA Voltage Range
DRVA Drive Current
VDRVA
FBA Regulation Threshold
FBA Load Regulation
OUTA Shunt Trip Level
FBA Leakage Current
Secondary Feedback Regulation
Threshold
VFBA
VFBA = 1.05V, VDRVA = 5V
VFBA = 0.965V, VDRVA = 5V
VDRVA = 5V, IDRVA = 1mA (sink)
VDRA = 5V, IDRVA = 0.5mA to 5mA
Rising edge
VFBA = 1.035V
VDRVA - VOUTA
0.5
26.0
V
0.4
mA
10
0.98 1.00 1.02
V
-1.2 -2.2
%
25
26
27
V
-0.1
+0.1
µA
0
V
DL5 Pulse Width
OUTA Leakage Current
REFERENCE (REF)
Reference Voltage
Reference Load-Regulation Error
REF Lockout Voltage
FAULT DETECTION
IOUTA
VDRVA = VOUTA = 25V
VREF
ΔVREF
VREF(UVLO)
LDO5 in regulation, IREF = 0
IREF = -5µA to +50µA
Rising edge, hysteresis = 100mV (typ)
1/
µs
3fOSC
50
µA
1.985 2.00 2.015
V
-10
+10
mV
1.90
V
Output Overvoltage Trip
Threshold (MAX8744 Only)
With respect to error-comparator
threshold
8
11
14
%
Output Overvoltage Fault
Propagation Delay (MAX8744 Only)
tOVP
50mV overdrive
10
µs
4 _______________________________________________________________________________________
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