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MAX6876ETX+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
10 ______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1V
CC
Optional Supply Voltage Input. Connect V
CC
to an alternate (i.e., always-on) supply if desired. V
CC
supports operation/communication when the monitored supplies are not powered or are below the
minimum required operating voltage. In a master/slave application, connect all V
CC
pins to a common
supply line.
2 GND Ground
3 ABP
Internal Analog Bypass. Bypass ABP with a 1µF capacitor to GND. ABP maintains the device supply
voltage during rapid power-down conditions.
4 TRKEN
Tracking Enable Input. TRKEN must be higher than 1.285V to enable voltage tracking power-up
operation. When TRKEN falls below 1.25V (3% hysteresis), OUT_ tracks down. Connect TRKEN to an
external resistor-divider network to set the desired monitor threshold. Connect TRKEN to ABP if not
used.
5 SYNCH
Selectable Tracking Synchronization Output/Input. SYNCH allows multiple MAX6876 devices to
control tracking of multiple power supplies (up to 16 voltages on the same I
2
C bus). One device is
programmed as SYNCH master and all other devices are programmed as slaves. SYNCH on the
master outputs the common ramp voltage to which all OUT_ voltages are tracked (with active control
loops). SYNCH of the slave devices is input for the ramp control voltage (no internal ramp is
generated in the slaves) (see the SYNCH section). Connect SYNCH to other SYNCH pins only.
6 HOLD
Active-Low, Open-Drain Synchronization Hold Output/Input. HOLD communicates synchronization
status between master/slave devices in multiple MAX6876 applications. The HOLD output remains
asserted while selected tracking IN_ inputs are below their selected thresholds (the slave device can
delay tracking start until its inputs are at their required stable voltage levels) or held low by the master
when it is counting the autoretry time after a detected fault condition (see the Synchronization Hold
Output (
HOLD
) section). Slave device SYNCH are inputs for the ramp control voltage.
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, ENABLE = MARGIN = MR = ABP = TRKEN, T
A
= +25°C, unless otherwise noted.)
20ms/div
OUT_
0V
MAX6876 toc10
1V/div
OUT4
OUT3
OUT2
OUT1
MIXED MODE
20ms/div
OUT_
0V
MAX6876 toc11
1V/div
OUT4
OUT3
OUT2
OUT1
MIXED MODE WITH FAST SHUTDOWN
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
______________________________________________________________________________________ 11
Pin Description (continued)
PIN NAME FUNCTION
7 OC
Active-Low, Open-Drain Overcurrent Output. OC
asserts low if any monitored IN_ to OUT_ voltage
falls out of the selected percentage of the IN_ voltage range (V
TH_OC
) for more than the programmed
t
OC.
OC monitoring begins only after supply tracking or sequencing has been completed and is
disabled during power-down operation.
8 REM
Open-Drain Bus Removal Output. REM signals when it is safe to remove the card after a controlled
track/sequence-down operation. REM goes high impedance when all V
OUT_
< V
TH_PL
. REM requires
an external pullup resistor. In master/slave mode, REM can be ORed together (the common REM
connection remains low if any V
OUT_
> V
TH_PL
threshold) (see the Typical Application Circuit and the
Bus Removal Output (REM) section).
9 FAULT
Active-Low, Open-Drain Tracking Fault Alert Output or Input. FAULT asserts low if a tracking failure is
present for longer than the specified fault period or if tracking voltages fails by more than ±250mV
(see the
FAULT
section).
10 RESET
Active-Low, Open-Drain Reset or Power-Good Output. RESET is low during power-up and power-
down tracking. RESET goes high after all selected OUT_ outputs exceed their selected thresholds
and the reset timeout period t
RESET
has expired. The reset timeout period is internally selectable.
RESET requires an external pullup resistor.
11 ENABLE
Logic ENABLE Input. ENABLE must be high to enable voltage tracking/sequencing power-up
operation. OUT_ begins tracking down when ENABLE is low. Connect to ABP if not used.
12 MARGIN
Active-Low Margin Input. The MARGIN function allows systems to be tested with supply voltages
outside their normal ranges without affecting supply tracking/sequencing or reset states. MARGIN
functionality is usually enabled after systems have powered up in normal mode. The MARGIN
functionality is disabled (returns to normal monitoring mode) after MARGIN returns high. MARGIN is
internally pulled up to ABP through a 100kΩ resistor.
13, 23 N.C. No Connection. Not internally connected.
14 MR
Active-Low Manual Reset Input. When MR is low, RESET goes low and remains asserted for the
selected timeout period after MR is pulled high. MR is internally pulled up to ABP through a 100kΩ
resistor.
15 SDA Serial-Interface Data Input/Output (Open-Drain). SDA requires an external pullup resistor.
16 SCL Serial-Interface Clock Input. SCL requires an external pullup resistor.
17 A0
18 A1
Serial-Interface Address Inputs. The inputs allow up to four MAX6876 devices to be addressed when
sharing a common data bus. A1 and A0 should be connected to GND or ABP.
19 PG1
20 PG2
21 PG3
22 PG4
Power-Good Output, Open-Drain. Each PG_ output signals when its monitored OUT_ voltage is within
the selected percentage of the IN_ voltage range (V
TH_PG
). PG_ is low until OUT_ exceeds the
programmable threshold (V
TH_PG
) for more than t
POK
. PG_ outputs are open-drain and require
external pullups if used.
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
12 ______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
24 REFIN
Reference Voltage Input. The MAX6876 can be configured to use the internal 1.25V reference or an
external voltage reference. REFIN is tri-stated when using the internal reference. REFIN provides the
threshold voltage for the voltage detectors when using an external voltage reference. Use an external
voltage reference when tighter voltage-detector accuracy is desired. When configured to an internal
reference, leave REFIN unconnected. When configured for an external reference, connect a 1.225V to
1.275V reference to REFIN.
25 OUT4
Monitored Output Voltage. The OUT4 output is monitored to control the supply slew rate and tracking
performance. OUT1–OUT4 begin to track up after the internal supply (ABP) exceeds the minimum
voltage requirements, V
TRKEN
> 1.285V threshold, ENABLE is logic high, and IN1–IN4 are all within
their selected thresholds. The OUT4 output falls out of the tracking equation as OUT4 approaches
IN4; other OUT_ supplies continue tracking up without signaling a system fault. OUT_ outputs are
tracked down during power-off conditions.
26 GATE4
Gate Drive for External n-Channel FETs. GATE4 begins enhancing the external n-channel FETs when
all monitored inputs are within their selected thresholds (0.5V to 5.5V), at least one IN_ input or V
CC
is
above the minimum operating voltage, V
TRKEN
> 1.285V threshold, and the ENABLE input is logic
high. During power-up mode, GATE_ voltages are enhanced with internal control loops forcing all
OUT_ voltages to track the reference ramp (SYNCH) at a programmed slew rate. An internal charge
pump boosts GATE4 to V
IN4
+ 5V to fully enhance the external n-channel FET when power-up is
complete.
27 IN4
Supply Voltage and Tracked Input Voltage. Nominal supply range is 0.5V to 5V. IN1, IN2, IN3, IN4, or
V
CC
must be greater than the internal UVLO (V
ABP
= 2.7V) to enable the tracking functionality. The
IN4 input is monitored with internally selected thresholds to ensure all supplies have stabilized before
tracking (or sequencing) is enabled.
28 OUT3
Monitored Output Voltage. OUT3 is monitored to control the supply slew rate and tracking
performance. OUT1–OUT4 begin to track up after the internal supply (ABP) exceeds the minimum
voltage requirements, V
TRKEN
> 1.285V threshold, ENABLE is logic high, and IN1–IN4 are all within
their selected thresholds. The OUT3 output falls out of the tracking equation as OUT3 approaches
IN3; other OUT_ supplies continue tracking up without signaling a system fault. OUT_ outputs are
tracked down during power-off conditions.
29 GATE3
Gate Drive for External n-Channel FETs. GATE3 begins enhancing the external n-channel FETs when
all monitored inputs are within their selected thresholds (0.5V to 5.5V), at least one IN_ input or V
CC
is
above the minimum operating voltage, V
TRKEN
> 1.285V threshold, and the ENABLE input is logic
high. During power-up mode, GATE_ voltages are enhanced with internal control loops forcing all
OUT_ voltages to track the reference ramp (SYNCH) at a programmed slew rate. An internal charge
pump boosts GATE3 to V
IN3
+ 5V to fully enhance the external n-channel FET when power-up is
complete.
30 IN3
Supply Voltage and Tracked Input Voltage. Nominal supply range is 0.5V to 5V. IN1, IN2, IN3, IN4, or
V
CC
must be greater than the internal UVLO (V
ABP
= 2.7V) to enable the tracking functionality. IN3 is
monitored with internally selected thresholds to ensure all supplies have stabilized before tracking (or
sequencing) is enabled.
31 OUT2
Monitored Output Voltage. OUT2 is monitored to control the supply slew rate and tracking
performance. OUT1–OUT4 begin to track up after the internal supply (ABP) exceeds the minimum
voltage requirements, V
TRKEN
> 1.285V threshold, ENABLE is logic high, and IN1–IN4 are all within
their selected thresholds. OUT2 output falls out of the tracking equation as OUT2 approaches IN2;
other OUT_ supplies continue tracking up without signaling a system fault. OUT_ outputs are tracked
down during power-off conditions.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39

MAX6876ETX+T

Mfr. #:
Buy MAX6876ETX+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits EEPROM-Prog Quad Power-Sup Sequence
Lifecycle:
New from this manufacturer.
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