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MAX1537AETX+ Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX1537AETX+
Description  High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1537AETX+ Datasheet(HTML) 8 Page - Maxim Integrated Products

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High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
8
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VIN = 12V, both SMPS enabled, VCC = 5V, FSEL = REF, SKIP = GND, VILIM_ = VLDO5, VINA = 15V, VLDOA = 12V,
ILDO5 = ILDO3 = ILDOA = no load, TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
MAX
UNITS
FAULT DETECTION
Output Overvoltage Trip
Threshold
OVP = GND, with respect to error-
comparator threshold
+8
+15
%
Output Undervoltage-Protection
Trip Threshold
With respect to error-comparator threshold
+65
+75
%
PGOOD Lower Trip Threshold
With respect to error-comparator threshold,
hysteresis = 1%
-14.0
-7.0
%
PGOOD Output Low Voltage
ISINK = 4mA
0.4
V
PGDLY Pulldown Resistance
25
Ω
PGDLY Trip Threshold
REF-
0.2
REF+
0.2
V
GATE DRIVERS
DH_ Gate-Driver On-Resistance
RDH
BST_ - LX_ forced to 5V
5
Ω
DL_, high state
5
DL_ Gate-Driver On-Resistance
RDL
DL_, low state
3
Ω
INPUTS AND OUTPUTS
High
2.4
Logic Input Voltage
SKIP, hysteresis = 600mV
Low
0.8
V
High
0.7 x
VCC
Fault Enable Logic Input Voltage
OVP, UVP, ONA
Low
0.4
V
Rising trip level
1.1
2.2
SHDN Input Trip Level
Falling trip level
0.95
1.05
V
Clear fault level
0.8
SMPS off level
1.6
Delay start level (REF)
1.9
2.1
ON_ Input Voltage
SMPS on level
2.4
V
High
VCC - 0.2
REF
1.7
2.3
FSEL Three-Level Input Logic
GND
0.4
V
Note 1: The MAX1533A/MAX1537A cannot operate over all combinations of frequency, input voltage (VIN), and output voltage. For
large input-to-output differentials and high-switching frequency settings, the required on-time may be too short to maintain
the regulation specifications. Under these conditions, a lower operating frequency must be selected. The minimum on-time
must be greater than 150ns, regardless of the selected switching frequency. On-time and off-time specifications are mea-
sured from 50% point to 50% point at the DH_ pin with LX_ = GND, VBST_ = 5V, and a 250pF capacitor connected from DH_
to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.
Note 2: When the inductor is in continuous conduction, the output voltage has a DC regulation level lower than the error-comparator
threshold by 50% of the ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage has a DC regula-
tion level higher than the trip level by approximately 1% due to slope compensation.
Note 3: Specifications are guaranteed by design, not production tested.
Note 4: Specifications to -40
°C are guaranteed by design, not production tested.


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