Datasheet
MAX1533A/MAX1537A
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, both SMPS enabled, V
CC
= 5V, FSEL = REF, SKIP = GND, V
ILIM_
= V
LDO5
, V
INA
= 15V, V
LDOA
= 12V,
I
LDO5
= I
LDO3
= I
LDOA
= no load, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Output Undervoltage-Protection
Trip Threshold
With respect to error-comparator threshold
65 70 75 %
Output Undervoltage Fault-
Propagation Delay
t
UVP
50mV overdrive 10 µs
Output Undervoltage-Protection
Blanking Time
t
BLANK
From rising edge of ON_
6144/
f
OSC
s
PGOOD Lower Trip Threshold
With respect to error-comparator
threshold, hysteresis = 1%
-14 -10
-7.5
%
PGOOD Propagation Delay
t
PGOOD
_
Falling edge, 50mV overdrive 10 µs
PGOOD Output Low Voltage I
SINK
= 4mA 0.4 V
PGOOD Leakage Current
I
PGOOD
_
High state, PGOOD forced to 5.5V 1 µA
PGDLY Pullup Current PGDLY = GND 4 5 6 µA
PGDLY Pulldown Resistance 10 25 Ω
PGDLY Trip Threshold
REF-
0.2
REF
REF+
0.2
V
Thermal-Shutdown Threshold T
SHDN
Hysteresis = 15°C
+160
°C
GATE DRIVERS
DH_ Gate-Driver On-Resistance R
DH
BST_ - LX_ forced to 5V 1.5 5 Ω
DL_, high state 1.7 5
DL_ Gate-Driver On-Resistance R
DL
DL_, low state 0.6 3
Ω
DH_ Gate-Driver Source/Sink
Current
I
DH
DH_ forced to 2.5V,
BST_ - LX_ forced to 5V
2A
DL_ Gate-Driver Source Current
I
DL
DL_ forced to 2.5V 1.7 A
DL_ Gate-Driver Sink Current
I
DL
(
SINK
)
DL_ forced to 2.5V 3.3 A
DL_ rising 35
Dead Time t
DEAD
DH_ rising 26
ns
LX_, BST_ Leakage Current V
BST
_ = V
LX
_ = 26V <2 20 µA
INPUTS AND OUTPUTS
High 2.4
Logic Input Voltage SKIP, hysteresis = 600mV
Low 0.8
V
High
0.7 x
V
CCFault Enable Logic Input Voltage
OVP, UVP, ONA
Low 0.4
V
Logic Input Current OVP, UVP, SKIP, ONA -1 +1 µA
Rising trip level
1.10
1.6
2.20
SHDN Input Trip Level
Falling trip level
0.96
1
1.04
V
Clear fault level/SMPS off level 0.8
Delay start level (REF) 1.9 2.1ON_ Input Voltage
SMPS on level 2.4
V