Datasheet

PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
MAIN PWM CONTROLLER
V
IN
228
Input Voltage Range
V
DD
, AV
DD
4.5 5.5
V
Output Adjust Range V
OUT
0.7 5.5 V
FB = OUT
0.693
0.7
0.707
FB = GND
2.47
2.5
2.53
Output Voltage Accuracy
(Note 2)
FB = V
DD
1.78
1.8
1.82
V
Soft-Start Ramp Time t
SS
Rising edge of SHDN to full current limit 1.7 ms
TON = GND (600kHz)
170 194
219
TON = REF (450kHz)
213 243
273
TON = open (300kHz) 316 352
389
On-Time t
ON
V
IN
= 15V,
V
OUT
= 1.5V
(Note 3)
TON = AV
DD
(200kHz) 461 516
571
ns
Minimum Off-Time
t
OFF_MIN
(Note 3)
200 300
450 ns
V
IN
Quiescent Supply Current I
IN
25 40 µA
V
IN
Shutdown Supply Current SHDN = GND 1 5 µA
All on (PWM, VTT, and VTTR on) 2.5 5
AV
DD
Quiescent Supply Current I
AVDD
STBY = GND (only VTTR and PWM on) 1 2
mA
AV
DD
+ V
DD
Shutdown Supply
Current
SHDN = GND 20 µA
Rising edge of V
IN
4.05 4.25 4.40
V
AV
DD
Undervoltage-Lockout
Threshold
Hysteresis 50 mV
V
DD
Quiescent Supply Current I
VDD
Set V
FB
= 0.8V 1 5 µA
MAX8632
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
IN
to GND .............................................................-0.3V to +30V
V
DD,
AV
DD
, VTTI to GND .........................................-0.3V to +6V
SHDN, REFIN to GND ..............................................-0.3V to +6V
SS, POK1, POK2, SKIP, ILIM, FB to GND ................-0.3V to +6V
STBY, TON, REF, UVP/OVP to GND ........-0.3V to (AV
DD
+ 0.3V)
OUT, VTTR to GND ..................................-0.3V to (AV
DD
+ 0.3V)
DL to PGND1..............................................-0.3V to (V
DD
+ 0.3V)
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
LX to BST..................................................................-6V to +0.3V
LX to GND .................................................................-2V to +30V
VTT to GND...............................................-0.3V to (V
VTTI
+ 0.3V)
VTTS to GND............................................-0.3V to (AV
DD
+ 0.3V)
PGND1, PGND2, TP0 to GND ...............................-0.3V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin 5mm x 5mm Thin QFN (derate 35.7mW/°C
above +70°C).................................................................2.86W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C