MAX5039 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Voltage-Tracking Controllers for PowerPC, DSPs, and ASICs

19-2461; Rev 1; 12/03
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Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
General Description
The MAX5039/MAX5040 provide intelligent control to
power systems where two supply voltages need track-
ing. These cases include PowerPC^®, DSP, and ASIC
systems, which require a lower CORE voltage supply
and a higher I/O voltage supply.
The MAX5039/MAX5040 control the output voltage of
the CORE and I/O supplies during power-up, power-
down, and brownout situations. They ensure that the
two power supplies rise or fall at the same rate, limiting
the voltage difference between the CORE and I/O sup-
plies. This eliminates stresses on the processor. The
MAX5039/MAX5040 shut down both the CORE and I/O
supplies if either one is shorted or otherwise fails to
come up.
The MAX5040 provides a power-OK (POK) signal that
signals the processor if the CORE supply, the I/O sup-
ply, and the system bus supply (V_CC) are above their
respective specified levels. The MAX5039/MAX5040
are targeted for nominal bus V_CC voltages from 4V to
5.5V. The MAX5039/MAX5040 work with CORE volt-
ages ranging from 800mV to about 3V (depending on
the gate-to-source turn-on threshold of the external N-
channel MOSFET) and I/O voltages ranging from
V_CORE to 4V. The MAX5039/MAX5040 provide tracking
control of the I/O and CORE voltages using a single
external N-channel MOSFET connected across them.
This MOSFET is not in series with the power paths and
does not dissipate any additional power during normal
system operation. The external MOSFET is only on for
brief periods during power-up/power-down cycling so a
low-cost, small-size MOSFET with a rating of 1/4th to
1/8th of the normal supply current is suitable.
The MAX5039/MAX5040 are offered in space-saving
8-pin µMAX and 10-pin µMAX packages, respectively.
Applications
PowerPC Systems
Embedded DSPs and ASICs
Embedded 16- and 32-Bit Controller Systems
Telecom/Base Station/Networking
Features
♦ Provide Tracking of Two External Power Supplies
During Power-Up and Power-Down
♦ Compatible with a Wide Range of External Power
Supplies Independent of Output Power
♦ Bus Voltage Undervoltage Lockout Enables/
Disables CORE and I/O Supplies Together
♦ Detect Short Circuit on V_CORE and V_I/O, Disable
CORE and I/O Supplies in Either Case
♦ Output Undervoltage Monitoring
♦ POK Status (MAX5040)
♦ Operating V_CC Supply Voltage Range: 2.5V to 5.5V
♦ I/O Voltage Range: V_CORE to 4V
♦ CORE Voltage Range: 0.8V to V_I/O
PART
MAX5039EUA-T
MAX5040EUB-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
10 µMAX
V_CC ^I/O
WITH MAX5039
OR MAX5040
CORE
WITHOUT
V_CC
MAX5039
I/O
OR MAX5040
CORE
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
PowerPC is a registered trademark of IBM Corp.
Power-On and Power-Off With and Without Voltage Tracking
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.