Datasheet

MAX8632
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
_______________________________________________________________________________________ 7
LOAD TRANSIENT (BUCK)
MAX8632 toc10
10µs/div
V
OUT
100mV/div
VTT
50mV/div
VTTR
50mV/div
I
LOAD
5A/div
0A
I
VTT
= 1.5A, I
VTTR
= 15mA
LOAD TRANSIENT VTT (-1.5A TO +1.5A)
MAX8632 toc11
10µs/div
V
OUT
50mV/div
VTT
50mV/div
VTTR
50mV/div
I
VTT
1A/div
0A
I
LOAD
= 12A, I
VTTR
= 15mA
LOAD TRANSIENT VTT (-3A TO +3A)
MAX8632 toc12
10µs/div
V
OUT
50mV/div
VTT
50mV/div
VTTR
50mV/div
I
VTT
2A/div
0A
I
LOAD
= 12A, I
VTTR
= 15mA
POWER-UP WAVEFORMS
MAX8632 toc13
200µs/div
OUT
2V/div
VTT
1V/div
VTTR
1V/div
V
IN
10V/div
0V
0V
0V
0V
V
DD
= 5V, I
LOAD
= 12A, I
VTT
= 1.5A, I
VTTR
= 15mA
POWER-DOWN WAVEFORMS
MAX8632 toc14
200µs/div
OUT
2V/div
VTT
1V/div
VTTR
1V/div
V
IN
10V/div
0V
0V
0V
0V
V
DD
= 5V, I
LOAD
= 12A, I
VTT
= 1.5A, I
VTTR
= 15mA
STARTUP AND SHUTDOWN INTO
HEAVY LOAD, DISCHARGE DISABLED
MAX8632 toc15
400s/div
V
OUT
1V/div
VTT
500mV/div
V
DL
10V/div
0V
0V
0V
0V
I
LOAD
= 10A,
I
VTT
= 1.5A
SHDN
5V/div
Typical Operating Characteristics (continued)
(V
VIN
= 12V, V
OUT
= 2.5V, TON = GND, SKIP = AV
DD
, circuit of Figure 8, T
A
= +25°C, unless otherwise noted.)
STARTUP AND SHUTDOWN INTO
LIGHT LOAD, DISCHARGE ENABLED
MAX8632 toc16a
400s/div
V
OUT
1V/div
VTT
500mV/div
V
DL
10V/div
0V
0V
0V
0V
SHDN
5V/div
I
LOAD
= 1A,
I
VTT
= NO LOAD
STANDBY RESPONSE
VTT LOADED AT 10Ω TO GND
MAX8632 toc17a
2ms/div
500mV/div
500mV/div
500mV/div
5V/div
V
OUT
VTT
VTTR
STBY
1.8V
0.9V
0.9V
SHUTDOWN BY LOSS OF V
DD
MAX8632 toc16b
200µs/div
V
DD
2V/div
V
OUT
500mV/div
V
DL
5V/div
I
OUT
5A/div
0A
1.8V
4V
0V