MAX8550-MAX8551 MAXIM [Maxim Integrated Products], MAX8550-MAX8551 Datasheet - Page 7

• Manufacturer Part Number: MAX8550-MAX8551
• Description: Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards
• Manufacturer: MAXIM [Maxim Integrated Products]

0.1A
12A
0V
0V
0V
0V
(V
VIN
V
DD
I
VTT
= 5V, I
= 12V, V
= 1.5A, I
LOAD TRANSIENT (BUCK)
POWER-UP WAVEFORMS
LOAD
VTTR
0V
0V
0V
0V
= 12A, I
Integrated DDR Power-Supply Solutions for
OUT
200µs/div
20µs/div
= 15mA
V
LIGHT LOAD, DISCHARGE ENABLED
DDQ
VTT
Desktops, Notebooks, and Graphic Cards
= 2.5V, TON = GND, SKIP = AV
= 1.5A, I
STARTUP AND SHUTDOWN INTO
_______________________________________________________________________________________
VTTR
MAX8550/51 toc10
MAX8550/51 toc13
2ms/div
= 15mA
V
100mV/div
VTT
100mV/div
VTTR
100mV/div
I
10A/div
OUT
1V/div
VTTR
1V/div
V
10V/div
LOAD
VTT
2V/div
OUT
IN
R
R
LOAD
VTT
MAX8550/51 toc16
= 20Ω
= 10Ω,
0V
0V
0V
0V
0A
LOAD TRANSIENT VTT (-1.5A TO +1.5A)
V
I
DD
LOAD
Typical Operating Characteristics (continued)
V
1V/div
SHDNA + SHDNB
5V/div
POK1
5V/div
VTT
1V/div
OUT
= 5V, I
DD
POWER-DOWN WAVEFORMS
= 12A, I
, circuit of Figure 8, T
LOAD
VTTR
= 12A, I
200µs/div
40µs/div
= 15mA
VTT
= 1.5A, I
VTTR
MAX8550/51 toc14
MAX8550/51 toc11
= 15mA
A
= +25°C, unless otherwise noted.)
0V
0V
0V
0V
OUT
1V/div
VTT
2V/div
VTTR
1V/div
V
10V/div
V
50mV/div
VTTR
50mV/div
I
2A/div
VTT
50mV/div
VTT
IN
VTT, VTTR STARTUP AND SHUTDOWN
OUT
I
VTT
= 1.5A, I
0A
0V
0V
0V
0V
VTTR
I
V
LOAD
HEAVY LOAD, DISCHARGE DISABLED
LOAD TRANSIENT VTT (-3A TO +3A)
I
I
LOAD
VTT
DDQ
= 15mA
200µs/div
= 1.5A
= 12A, I
= 12A,
STARTUP AND SHUTDOWN INTO
VTTR
= 15mA
40µs/div
1ms/div
MAX8550/51 toc17
VTT
1V/div
SHDNB
5V/div
POK2
5V/div
VTTR
1V/div
MAX8550/51 toc12
MAX8550/51 toc15
V
50mV/div
VTTR
50mV/div
I
5A/div
VTT
50mV/div
VTT
V
2V/div
VTT
1V/div
POK1
5V/div
SHDNA + SHDNB
5V/div
OUT
OUT
7