MAX8745 View Datasheet(PDF) - Maxim Integrated
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Description
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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
Tri-Level Input Logic
Input Leakage Current
SYMBOL
CONDITIONS
SKIP, FSEL
High
REF
GND
SKIP, FSEL forced to GND or LDO5
SHDN forced to GND or 26V
MIN
VLDO5
- 0.4
1.65
TYP
-1
-1
MAX UNITS
V
2.35
0.5
+1
µA
+1
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN = 12V, both SMPS enabled, FSEL = REF, SKIP = GND, ILIM = LDO5, FBA = LDO5, IREF = ILDO5 = IOUTA =
no load, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX UNITS
INPUT SUPPLIES (Note 1)
VIN Input Voltage Range
VIN Operating Supply Current
VIN Standby Supply Current
VIN Shutdown Supply Current
LDO5 in regulation
5.4
VIN
IN = LDO5, VCSL5 < 4.4V
4.5
IIN LDO5 switched over to CSL5, either SMPS on
IIN(STBY)
VIN = 6V to 26V, both SMPS off, includes
ISHDN
IIN(SHDN) VIN = 6V to 26V
26.0
V
5.5
40
μA
120
μA
20
μA
Quiescent Power Consumption
Both SMPS on, FB3 = FB5 = LDO5; SKIP =
PQ
GND, VCSL3 = 3.5V, VCSL5 = 5.3V,
VOUTA = 15V,
PIN + PCSL3 + PCSL5
4.5
mW
MAIN SMPS CONTROLLERS
3.3V Output Voltage in Fixed
Mode
VOUT3
VIN = 6V to 26V, SKIP = FB3 = LDO5,
0 < VCSH3 - VCSL3 < 50mV (Note 2)
3.255
3.375
V
5V Output Voltage in Fixed Mode
VOUT5
VIN = 6V to 26V, SKIP = FB5 = LDO5,
0 < VCSH5 - VCSL5 < 50mV (Note 2)
4.925
5.105
V
Feedback Voltage in Adjustable
Mode
VFB_
VIN = 6V to 26V, FB3 or FB5
duty factor = 20% to 80% (Note 2)
1.974
2.046
V
Output Voltage Adjust Range
Either SMPS
2.0
5.5
V
FB3, FB5 Dual Mode Threshold
3V
VLDO5 -
V
0.4
Operating Frequency (Note 1)
fOSC
FSEL = GND
FSEL = REF
FSEL = LDO5
170
230
270
330 kHz
425
575
Maximum Duty Factor
DMAX
97
%
6 _______________________________________________________________________________________
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