19-2461; Rev 1; 12/03
KIT
ATION
EVALU
E
BL
AVAILA
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
General Description
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
MAX5039/MAX5040
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.
Ordering Information
PART
MAX5039EUA-T
MAX5040EUB-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
10 µMAX
V
CC
WITH MAX5039
OR MAX5040
I/O
Applications
PowerPC Systems
Embedded DSPs and ASICs
Embedded 16- and 32-Bit Controller Systems
Telecom/Base Station/Networking
CORE
V
CC
I/O
CORE
WITHOUT
MAX5039
OR MAX5040
Power-On and Power-Off With and Without Voltage Tracking
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
PowerPC is a registered trademark of IBM Corp.
________________________________________________________________
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.
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
MAX5039/MAX5040
ABSOLUTE MAXIMUM RATINGS
(All Voltages Referenced to GND)
V
CC
, NDRV,
SDO,
and POK ..................................-0.3V to +14V
CORE_FB, UVLO, I/O_SENSE, I/O, CORE ..........-0.3V to +4.25V
All Pins to V
CC
(except POK)............................................. +0.3V
NDRV Continuous Current .................................................50mA
Continuous Current, All Other Pins .....................................20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.5V to 5.5V, V
UVLO
= 2V, V
CORE
= 1.8V, V
I/O
= 2.5V, V
CORE_FB
= 1V, V
I/O_SENSE
= 2V (MAX5040 only),
T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at V
CC
= 5V, T
A
= +25°C.)
PARAMETER
EXTERNAL SUPPLY CONDITIONS
V
CC
V
CC
Supply Current
Lowest V
CC
Where
SDO
Is Valid
SDO
Output Low Voltage at
V
CC
= V
CCLO
V
CC
IC Turn-On Voltage
Threshold (Note 3)
CORE Voltage Range
I/O Voltage Range
V
CORE
V
I/O
V
CC
I
CC
V
CCLO
(Note 2)
V
UVLO
= V
CC
= V
CCLO
, I
SDO
= 50µA,
measure V
SDO
(Note 2)
V
CC
rising
Hysteresis
I/O and CORE valid, V
CC
= 5.5V (Notes 4, 5)
I/O and CORE valid (Note 5) V
CC
> 4V
I/O and CORE valid (Note 5),
2.5V
≤
V
CC
≤
4V
V
UVLO
rising
Hysteresis
V
UVLO
= 2V
0.8
V
CORE
V
CORE
2.43
0.05
V
I/O
4.0
V
CC
V
(Note 1)
2.5
1.3
5.5
2.25
0.9
0.4
2.5
V
mA
V
V
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
USER-PROGRAMMABLE UNDERVOLTAGE LOCKOUT
UVLO Trip Threshold
UVLO Input Bias Current
CORE AND I/O REGULATION
CORE Feedback, CORE_FB, and
Reference Voltage
CORE Regulator Large-Signal Gain
CORE Regulator Crossover
Frequency
V
C_REF
A
V
CORE_FB to NDRV
CORE_FB to NDRV
Pullup strength,
V
I/O
= 1V,
V
CORE
= 2V, I
NDRV
= -10mA
Pulldown strength,
V
I/O
= 2V,
V
CORE
= 1V, I
NDRV
= 10mA
I/O-CORE Comparator Trip
Threshold (Note 6)
V
TH
V
CORE
- V
I/O
, V
I/O
falling
V
CORE
- V
I/O
, V
I/O
rising
V
CC
≥
3V
V
CC
≥
2.5V
V
CC
≥
3V
V
CC
≥
2.5V
60
-15
784
800
60
400
40
50
13
17
90
0
80
100
Ω
27
35
130
+15
mV
816
mV
dB
kHz
V
UVCC
1.200
1.230
110
250
1.260
V
mV
nA
NDRV Output Resistance
2
_______________________________________________________________________________________
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.5V to 5.5V, V
UVLO
= 2V, V
CORE
= 1.8V, V
I/O
= 2.5V, V
CORE_FB
= 1V, V
I/O_SENSE
= 2V (MAX5040 only),
T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at V
CC
= 5V, T
A
= +25°C.)
PARAMETER
Regulator Amp Gain
CORE Pulldown Resistance
MONITOR OUTPUTS
SDO
Output Low Voltage
V
OLSDO
I
SDO
= 1.8mA, V
UVLO
= 1V, V
CC
= 2.5V
I
SDO
= -1.0mA, V
CC
= 4V
SDO
Output High Voltage
V
OHSDO
I
SDO
= -1.0mA, V
CC
= 2.5V
I/O_SENSE Trip Threshold
POK Output Low Voltage
POK Leakage Current
POK Glitch Rejection Time
Fault Time
I/O and CORE INPUTS
I/O Input Bias Current
CORE Input Bias Current
I/O_SENSE Input Bias Current
CORE_FB Input Bias Current
V
I/O
= 1V
V
CORE
= 1V
V
I/O_SENSE
= 0.8V
V
CORE_FB
= 1.2V
20
20
250
300
µA
µA
nA
nA
V
I/O_REF
V
OLPOK
I
LPOK
t
POK
t
FAULT
V
I/O_SENSE
rising
Hysteresis
I
POK
= 1.8mA
V
POK
= V
CC
(Note 7)
(Note 8)
10
50
15
20
V
CC
-
0.4V
V
V
CC
-
0.55V
1.200
1.230
25
0.4
1.0
1.260
V
mV
V
µA
µs
ms
0.4
V
SYMBOL
A
VOL
V
CORE
= 1.8V, V
UVLO
= 1V, V
CC
= 2.5V
CONDITIONS
MIN
TYP
4000
20
50
MAX
UNITS
V/V
Ω
MAX5039/MAX5040
Note 1:
V
CC
slew-rate limited to 30V/µs.
Note 2:
SDO
automatically goes low when the UVLO pin drops below its threshold (or V
CC
drops below 2.5V).
SDO
remains low as
V
CC
falls. For some V
CC
below V
CCLO
SDO
may float.
Note 3:
This undervoltage lockout disables the MAX5039/MAX5040 at V
CC
voltages below which the device cannot effectively oper-
ate. When V
CC
drops below the threshold,
SDO
goes low, the bleeder turns off, and POK is high impedance.
Note 4:
In order to regulate correctly, V
CC
must be higher than V
CORE
plus the turn-on voltage of the external N-channel MOSFET.
Note 5:
I/O and CORE valid mean the voltages on these pins have settled within their target specifications for normal operation.
Note 6:
CORE and I/O supplies rise and fall rates must be limited to less than 6.6V/µs.
Note 7:
POK does not deassert for glitches less than t
POK
.
Note 8:
A fault condition is latched when either of the two following conditions maintains for longer than t
FAULT
:
V
CORE_FB
< V
C_REF
(i.e., V
CORE
is less than its set point)
V
I/O
< V
CORE
A FAULT condition forces
SDO
and POK (MAX5040 only) low. CORE discharges to GND through 20Ω while V
CC
> 2.5V.
Cycle UVLO or V
CC
low, then high, to clear a FAULT.
_______________________________________________________________________________________
3
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
MAX5039/MAX5040
Typical Operating Characteristics
(V
CC
= 5V, V
CORE
= 1.8V, V
I/O
= 3.3V, T
A
= +25°C, unless otherwise specified.)
SYSTEM POWER-UP/POWER-DOWN
(V
I/O
RISING BEFORE V
CORE
)
V
CC
NDRV
SDO
POK
SDO
AND POK
5V/div
I/O
I/O
I/O
AND CORE
1V/div
I/O
AND CORE
1V/div
5ms/div
MAX5039/40 toc01
SYSTEM POWER-UP/POWER-DOWN
WITHOUT MAX5039/MAX5040
(V
I/O
RISING BEFORE V
CORE
)
MAX5039/40 toc02
V
CC
5V/div
NDRV
5V/div
V
CC
V
CC
5V/div
CORE
5ms/div
CORE
CORE_FB REFERENCE (V
C_REF
)
vs. V
CC
AND TEMPERATURE
MAX5039/40 toc03
CORE REGULATOR LOOP BODE PLOT
(SEE FIGURE 9)
60
50
40
GAIN (dB)
30
20
10
PHASE
MAX5039/40 toc04
804
803
CORE_FB REFERENCE (mV)
802
801
800
799
798
797
796
2.5
3.5
V
CC
(V)
4.5
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
V
CC
= 5V, V
I/O
= 3.3V, V
CORE
= 1.8V AT 1A
180
150
120
90
60
30
PHASE MARGIN (DEGREES)
0
-10
-20
5.5
100
1k
GAIN
0
-30
-60
10k
100k
FREQUENCY (Hz)
V
SDO
vs. I
SDO(SINK)
V
CC
= 2.5V
MAX5039/40 toc05
V
SDO
vs. I
SDO(SINK)
V
CC
= 0.9V
350
300
T
A
= +85°C
250
V
SDO
(mV)
200
150
100
T
A
= -40°C
50
0
T
A
= +25°C
MAX5039/40 toc06
400
350
300
250
V
SDO
(mV)
200
T
A
= -40°C
150
100
50
0
0
1
2
I
SDO(SINK)
(mA)
3
4
T
A
= +25°C
T
A
= +85°C
400
0
0.1
0.2
0.3
0.4
0.5
0.6
I
SDO(SINK)
(mA)
4
_______________________________________________________________________________________
Voltage-Tracking Controllers for
PowerPC, DSPs, and ASICs
MAX5039/MAX5040
Typical Operating Characteristics (continued)
(V
CC
= 5V, V
CORE
= 1.8V, V
I/O
= 3.3V, T
A
= +25°C, unless otherwise specified.)
V
SDO
vs.I
SDO(SOURCE)
MAX5039/40 toc07
NDRV PULLDOWN STRENGTH
MAX5039/40 toc08
NDRV PULLUP STRENGTH
T
A
= -40°C
MAX5039/40 toc09
5
V
CC
= 4.5V
4
T
A
= +85°C
V
SDO
(V)
3
V
CC
= 2.5V
2
T
A
= +85°C
1
T
A
= +25°C
T
A
= -40°C
T
A
= +25°C
T
A
= -40°C
500
450
400
350
V
NDRV
(mV)
300
250
200
150
100
50
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
V
CC
= 5V
0
4
8
12
16
T
A
= -40°C
V
CC
= 2.5V
T
A
= +85°C
T
A
= +25°C
6
5
4
V
NDRV
(V)
3
V
CC
= 2.5V
2
1
0
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
V
CC
= 5V
T
A
= +85°C
T
A
= +25°C
0
0
0.5
1.0
1.5
2.0
2.5
3.0
I
SDO(SOURCE)
(mA)
0
20
0
4
8
12
16
20
I
NDRV
(mA)
I
NDRV
(mA)
UVLO RISING THRESHOLD vs. V
CC
MAX5039/40 toc10
UVLO HYSTERESIS vs. V
CC
115
110
UVLO HYSTERESIS ( mV)
T
A
= +85°C
T
A
= +25°C
V
I/O_REF
(V)
105
MAX5039/40 toc11
I/O_SENSE THRESHOLD (V
I/O_REF
) vs. V
CC
1.238
1.237
1.236
1.235
1.234
1.233
1.232
1.231
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
MAX5039/40 toc12
1.239
1.244
1.242
1.240
V
UVCC
(V)
1.238
1.236
1.234
1.232
1.230
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
100
T
A
= -40°C
95
90
5.5
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
1.230
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
I/O_SENSE HYSTERESIS vs. V
CC
29
I/O_SENSE HYSTERESIS (mV)
28
27
26
25
24
23
22
21
20
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
MAX5039/40 toc13
POK GLITCH REJECTION vs. V
CC
MAX5039/40 toc14
30
49
48
GLITCH REJECTION TIME (µs)
47
46
T
A
= +25°C
45
44
43
2.5
3.0
3.5
4.0
V
CC
(V)
T
A
= -40°C
4.5
5.0
T
A
= +85°C
5.5
_______________________________________________________________________________________
5
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