MAX8744 データシートの表示（PDF） - Maxim Integrated
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MAX8744
Maxim Integrated
MAX8744 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
Output Voltage Adjust Range
FB3, FB5 Dual Mode Threshold
Feedback Input Leakage Current
DC Load Regulation
Line Regulation Error
Operating Frequency (Note 1)
Maximum Duty Factor
Minimum On-Time
SMPS3-to-SMPS5 Phase Shift
CURRENT LIMIT
ILIM Adjustment Range
Current-Sense Input Leakage
Current
Current-Limit Threshold (Fixed)
Current-Limit Threshold
(Adjustable)
Current-Limit Threshold
(Negative)
Current-Limit Threshold
(Zero Crossing)
Idle Mode™ Threshold
SYMBOL
CONDITIONS
Either SMPS
fOSC
DMAX
tONMIN
VFB3 = VFB5 = 2.1V
Either SMPS, SKIP = LDO5,
0 < VCSH_ - VCSL_ < 50mV
Either SMPS, 6V < VIN < 26V
FSEL = GND
FSEL = REF
FSEL = LDO5
(Note 1)
SMPS5 starts after SMPS3
VLIMIT
VLIMIT
VNEG
VZX
VIDLE
CSH3 = CSH5 = GND or LDO5
VCSH_ - VCSL _, ILIM = LDO5
VCSH_ - VCSL _
VILIM = 2.00V
VILIM = 1.00V
VCSH_ - VCSL _, SKIP = ILIM = LDO5
VCSH_ - VCSL _, SKIP = LDO5, adjustable
mode, percent of current limit
VCSH_ - VCSL _, SKIP = GND,
ILIM = LDO5
ILIM = LDO5
VCSH_ - VCSL _,
SKIP = GND
With respect to
current-limit
threshold (VLIMIT)
MIN TYP MAX UNITS
2.0
5.5
V
3.0
VLOO5 VLOO5
- 1.0 - 0.4
V
-0.1
+0.1
µA
-0.1
%
0.03
%/V
170
200
230
270 300
330
kHz
425
500
575
97.5
99
%
100
ns
40
%
144
Deg
0.5
VREF
V
-1
+1
µA
45
50
55
mV
185
200
215
mV
94
100
106
-67
-60
-53
mV
-120
%
0
3
6
mV
6
10
14
mV
20
%
Idle Mode Threshold
(Low Audible-Noise Mode)
VIDLE
VCSH_ - VCSL _,
SKIP = REF
ILIM = LDO5
With respect to
current-limit
threshold (VLIMIT)
2.5
5
7.5
mV
10
%
ILIM Leakage Current
ILIM = GND or REF
-1
+1
µA
Idle Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________ 3
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