Datasheet

MAX8632
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
_______________________________________________________________________________________ 3
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
REFERENCE
Reference Voltage V
REF
AV
DD
= 4.5V to 5.5V; I
REF
= 0
1.98
2
2.02
V
Reference Load Regulation I
REF
= 0 to 50µA
0.01
V
V
REF
rising
1.93
V
REF Undervoltage Lockout
Hysteresis
300
mV
FAULT DETECTION
OVP Trip Threshold
(Referred to Nominal V
OUT
)
UVP/OVP = AV
DD
112 116
120 %
UVP Trip Threshold
(Referred to Nominal V
OUT
)
65 70 75 %
Lower level, falling edge, 1% hysteresis 87 90 93
POK1 Trip Threshold
(Referred to Nominal V
OUT
)
Upper level, rising edge, 1% hysteresis
107 110
113
%
Lower level, falling edge, 1% hysteresis
87.5
90
92.5
POK2 Trip Threshold
(Referred to Nominal V
VTTS
and V
VTTR
)
Upper level, rising edge, 1% hysteresis
107.5 110 112.5
%
POK2 Disable Threshold
(Measured at REFIN)
V
REFIN
rising (hysteresis = 75mV typ) 0.7 0.9 V
UVP Blanking Time From rising edge of SHDN 10 20 40 ms
OVP, UVP, POK_ Propagation
Delay
10 µs
POK_ Output Low Voltage I
SINK
= 4mA 0.3 V
POK_ Leakage Current V
POK_
= 5.5V, V
FB
= 0.8V, V
VTTS
= 1.3V 1 µA
ILIM Adjustment Range V
ILIM
0.25 2.00
V
ILIM Input Leakage Current 0.1 µA
Current-Limit Threshold (Fixed)
PGND1 to LX
45 50 55 mV
Current-Limit Threshold
(Adjustable) PGND1 to LX
V
ILIM
= 2V
170 200
235 mV
Current-Limit Threshold (Fixed,
Negative Direction) PGND1 to LX
SKIP = AV
DD
-75 -60 -45 mV
Current-Limit Threshold
(Adjustable, Negative Direction)
PGND1 to LX
SKIP = AV
DD
, V
ILIM
= 2V
-250
mV
Zero-Crossing Detection
Threshold PGND1 to LX
3mV
Thermal-Shutdown Threshold
+160
°C
Thermal-Shutdown Hysteresis 15 °C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +15V, V
DD
= AV
DD
= V
SHDN
= STBY = V
BST
= V
ILIM
= 5V, V
OUT
= V
REFIN
= V
VTTI
= 2.5V, UVP/OVP = TP0 = FB = SKIP
= GND, PGND1 = PGND2 = LX = GND, TON = OPEN, V
VTTS
= V
VTT
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)