MAX5039EUA+ Maxim Integrated Products, MAX5039EUA+ Datasheet - Page 8

• Manufacturer Part Number: MAX5039EUA+
• Description: IC CNTRLR VOLT TRACK 8-MSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX5039EUA+

• Applications: Processor
• Current - Supply: 1.3mA
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
Figure 1. System Power-Up/Power-Down (V I/O Rising Before
V CORE )
Figure 3. System Power-Up/Power-Down (V CORE Rising
Before V I/O )
supply. The MAX5040 holds up I/O by driving NDRV to
V
voltage) until the I/O supply comes up (at around
16ms). At this point, NDRV goes to GND and POK goes
high. UVLO is driven low (at around 22ms), causing
SDO to go low, disabling the CORE and I/O supplies.
The CORE supply powers down at about 23ms and
NDRV goes to 2.8V to regulate the CORE supply until
I/O falls. Then NDRV goes to V
falls to the CORE voltage (at around 36ms).
Figure 8 (with MAX5040) starts out with the supplies in
their normal range. At 3ms, CORE is shorted to GND.
8
CC
_______________________________________________________________________________________
(because the I/O voltage is less than the CORE
V
NDRV
V
CC
SYSTEM POWER-UP/POWER-DOWN
SYSTEM POWER-UP/POWER-DOWN
CC
NDRV
SDO
(V
(V
POK
I/O
I/O
CORE
POK
RISING BEFORE V
SDO
RISING BEFORE V
5ms/div
5ms/div
CORE
CORE
CC
CORE
I/O
when the I/O voltage
I/O
)
)
V
5V/div
NDRV
5V/div
SDO
AND POK
5V/div
I/O
AND CORE
1V/div
V
5V/div
NDRV
5V/div
SDO
AND POK
5V/div
I/O
AND CORE
1V/div
CC
CC
NDRV goes high, and POK goes low immediately.
NDRV shorts the I/O supply to the CORE supply, bring-
ing the supplies down together. After 15ms, the
MAX5040 latches a fault and SDO goes low turning off
the supplies.
The MAX5039/MAX5040 voltage-tracking controllers
limit the maximum differential voltage between two
power supplies during power-up, power-down, and
brownout conditions. The devices provide a shutdown
output control signal, SDO, which is used to turn on
Figure 2. System Power-Up/Power-Down Without MAX5039/
MAX5040 (V I/O Rising Before V CORE )
Figure 4. System Power-Up/Power-Down Without MAX5039/
MAX5040 (V CORE Rising Before V I/O )
SYSTEM POWER-UP/POWER-DOWN
SYSTEM POWER-UP/POWER-DOWN
WITHOUT MAX5039/MAX5040
WITHOUT MAX5039/MAX5040
(V
(V
I/O
CORE
I/O
RISING BEFORE V
CORE
RISING BEFORE V
Detailed Description
5ms/div
5ms/div
CORE
V
V
CC
CC
CORE
I/O
)
)
I/O
V
5V/div
I/O
AND CORE
1V/div
V
5V/div
I/O
AND CORE
1V/div
CC
CC