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
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output Undervoltage Protection
Trip Threshold
With respect to error-comparator
threshold
65
70
75
%
Output Undevoltage Fault
Propagation Delay
tUVP
50mV overdrive
10
µs
Output Undervoltage Protection
Blanking Time
PGOOD_ Lower Trip Threshold
PGOOD_ Propagation Delay
PGOOD_ Output Low Voltage
PGOOD_ Leakage Current
Thermal-Shutdown Threshold
GATE DRIVERS
DH_ Gate-Driver On-Resistance
DL_ Gate-Driver On-Resistance
DH_ Gate-Driver Source/Sink
Current
DL_ Gate-Driver Source Current
DL_ Gate-Driver Sink Current
Dead Time
Internal BST_ Switch On-
Resistance
BST_ Leakage Current
INPUTS AND OUTPUTS
SHDN Input Trip Level
ONA Logic Input Voltage
ON3, ON5 Input Voltage
tBLANK
tPGOOD_
IPGOOD_
tSHDN
From rising edge of ON_ with respect to
fSW
With respect to error-comparator
threshold, hysteresis = 1% (typ)
Falling edge, 50mV overdrive
Rising edge, 50mV overdrive
ISINK = 1mA
High state, PGOOD_ forced to 5.5V
Hysteresis = 15°C
RDH
BST_ – LX_ forced to 5V
DL_, high state
RDL
DL_, low state
IDH
DH_ forced to 2.5V, BST_ - LX_ forced to
5V
IDL (SOURCE) DL_ forced to 2.5V
IDL (SINK) DL_ forced to 2.5V
tDEAD
DH_low to DL_high
DL_low to DH_high
RBST
IBST = 10mA
VBST_ = 26V
Rising trip level
Falling trip level
Hysteresis = 600mV (typ)
High
Low
SMPS off level/clear fault level
Delay start level
SMPS on level
5000
-12
15
15
1.1
0.96
2.4
1.9
2.4
6144
-10
10
1
+160
1.3
1.7
0.6
2
1.7
3.3
45
44
5
2
1.6
1
7000 1/fOSC
-8
%
µs
0.4
V
1
µA
°C
5
Ω
5
Ω
3
A
A
A
ns
Ω
20
µA
2.2
V
1.04
V
0.8
0.8
2.1
V
_______________________________________________________________________________________ 5
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