Datasheet

MAX5946
Dual PCI Express, Hot-Plug
Controller
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(V
12VIN
= V
12SA+
= 12V, V
3.3VAUXIN
= V
3.3S_+
= V
ON_
= V
AUXON_
= V
INPUT_
= 3.3V, PRES-DET_ = GND, FON_ = PORADJ = TIM =
float, FAULT_ = 10kΩ to 3.3VAUXIN, PWRGDA = 10kΩ to 3.3VAUXO_, T
A
= +25°C, unless otherwise noted, see the Typical
Application Circuit.)
3.3V INPUT/3.3V AUXILIARY INPUT
POWER-UP
MAX5946 toc16
3.3V OUTPUT
5V/div
PWRGD_
5V/div
3.3VAUXO_
5V/div
3.3G_
10V/div
100ms/div
3.3S_+
5V/div
TURN-ON DELAY 3.3V OUTPUT AND
3.3V AUXILIARY OUTPUT
MAX5946 toc17
4ms/div
5V/div
5V/div
5V/div
5V/div
10V/div
3.3VAUXO_
OUTPUT VOLTAGE
3.3 OUTPUT VOLTAGE
3.3 INPUT,
3.3VAUXIN
3.3G_
PWRGD
FAULT CONDITION ON 12V OUTPUT
(AUTORESTART OPTION MAX5946A)
MAX5946 toc18
12G_
20V/div
FAULT_
5V/div
12V OUTPUT CURRENT
5A/div
100ms/div
12V OUTPUT VOLTAGE
10V/div
t
RESTART
R
LOAD
STEP TO 1.5Ω
FAULT CONDITION ON 3.3V OUTPUT
(AUTORESTART OPTION MAX5946A)
MAX5946 toc19
3.3G_
10V/div
FAULT_
5V/div
3.3V MAIN OUTPUT CURRENT
2A/div
100ms/div
3.3V OUTPUT VOLTAGE
5V/div
t
RESTART
R
LOAD
STEP TO 0.5Ω
FAULT CONDITION ON AUXILIARY OUTPUT
(AUTORESTART OPTION MAX5946A)
MAX5946 toc20
FAULT_
2V/div
3.3VAUXO_ OUTPUT CURRENT
500mA/div
100ms/div
3.3VAUXO_ OUTPUT VOLTAGE
2V/div
t
RESTART
R
LOAD
STEP TO 4Ω
FAULT CONDITION ON 12V OUTPUT
(LATCH OPTION MAX5946L)
MAX5946 toc21
12G_
20V/div
FAULT_
5V/div
12V OUTPUT CURRENT
5A/div
100ms/div
12V OUTPUT VOLTAGE
10V/div
R
LOAD
STEP TO 1.5Ω