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MAX6876ETX+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39
General Description
The MAX6876 EEPROM-configurable, multivoltage
power tracker/supervisor monitors four system voltages
and ensures proper power-up and power-down condi-
tions for systems requiring voltage tracking and/or
sequencing. The MAX6876 provides a highly config-
urable solution as key thresholds and timing parame-
ters are programmed through an I
2
C interface and
these values are stored in internal EEPROM. The
MAX6876 also provides supervisory functions and an
overcurrent detection circuit.
The MAX6876 features programmable undervoltage and
overvoltage thresholds for each input supply. When all
voltages are within specifications, the device turns on the
external n-channel MOSFETs to either sequence or track
the voltages to the system. All of the voltages can be
sequenced or tracked or powered up with a combination
of the two options. During tracking, the voltage at the
GATE of each MOSFET is increased to slowly turn on
each supply. The voltages at the source of each MOSFET
are compared to each other to ensure that the voltage dif-
ferential between each monitored supply does not
exceed 250mV (typ). Tracking is dynamically adjusted to
force all outputs to track within a ±125mV window from a
reference ramp; if, for any reason, any supply fails to
track within ±250mV from the reference ramp, a FAULT
output is asserted, the power-up mode is terminated, and
all outputs are powered off. Power-up mode is also termi-
nated if the controlled voltages fail to complete the ramp-
up within a programmable FAULT timeout. The MAX6876
features latch-off and autoretry modes to power on again
after a fault condition has been detected.
Other features of the MAX6876 include a reset circuit, a
manual reset input (MR), and a margin disable input
(MARGIN). The device also features outputs for indicat-
ing a power-good condition (PG_) and an overcurrent
condition (OC), and a bus-removal (REM) output.
The MAX6876 is available in a small 6mm x 6mm, 36-
pin thin QFN package and is fully specified over the
extended -40°C to +85°C temperature range.
Applications
Features
♦ Tracking/Sequencing for Up to Four Supply
Voltages (With One MAX6876 Device) and
Tracking for Up to 16 Supply Voltages (Using
Four MAX6876 Devices)
♦ EEPROM-Configurable Tracking/Sequencing
Control
♦ Bus Voltage Independent Operation (MAX6876 Is
Powered from the Tracked Supply Voltages or
Always-On Supply)
♦ EEPROM-Selectable Undervoltage/Overvoltage-
Lockout Thresholds for Each Input Supply
♦ EEPROM-Selectable Power-Up/Down Slew Rate
♦ Programmable Power-Good Output Thresholds
and Timing
♦ Global Adjustable Undervoltage Lockout or Logic
ENABLE Input
♦ Independent Internal Charge Pumps to Enhance
External n-Channel FETs (V
GATE_SOURCE
= 5V)
♦ Post Power-Up Selectable Overcurrent Detection
♦ 0.5V to 5.5V IN_ Threshold Range
♦ ±1.5% Threshold Accuracy
♦ I
2
C/SMBus™-Compatible Serial Interface
♦ Small 6mm x 6mm, 36-Pin Thin QFN Package
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
________________________________________________________________ Maxim Integrated Products 1
IN4
GATE4
REFIN
N.C.
PG2
PG1
PG4
PG3
OUT4
ABP
TRKEN
SYNCH
OC
REM
FAULT
V
CC
1
2
3
4
5
6
7
8
9
27
26
25
24
23
22
21
20
19
MR
SDA
SCL
A1
N.C.
MARGIN
ENABLE
RESET
GATE1
OUT1
IN2
GATE2
OUT2
IN3
GATE3
OUT3
IN1
6mm x 6mm
THIN QFN
MAX6876
TOP VIEW
HOLD
A0
GND
36 35 34 33 32 31 30 29 28
10 11 12 13 14 15 16 17 18
EP*
*EXPOSED PADDLE
Pin Configuration
Ordering Information
19-3479; Rev 0; 10/04
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.
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX6876ETX
-40°C to +85°C 36 Thin QFN T3666-3
Multivoltage Systems
Networking Systems
Telecom
Storage Equipment
Servers/Workstations
SMBus is a trademark of Intel Corp.
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages are referenced to GND, unless otherwise noted.)
GATE_.............................................................-0.3V to (IN_ + 6V)
IN1–IN4, V
CC
............................................................-0.3V to +6V
OUT1–OUT4, SYNCH, ABP,
REFIN...............................-0.3V to Max (IN1–IN4, V
CC
) + 0.3V
ENABLE, TRKEN, HOLD, FAULT, MR, MARGIN......-0.3V to +6V
RESET, PG1–PG4, OC, REM....................................-0.3V to +6V
SDA, SCL, A0, A1.....................................................-0.3V to +6V
Input/Output Current (all pins except OUT_ and GND) ...±20mA
OUT_, GND Current..........................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
36-Pin, 6mm x 6mm Thin QFN
(derate 26.3mW/°C above +70°C)..............................2105mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
CC
, IN1–IN4 = +2.7V to +5.5V; ENABLE = MARGIN = MR = ABP = TRKEN; T
A
= -40°C to +85°C, unless otherwise specified.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
GATE_ = PG_ = RESET = 0 1.4
Operating Voltage Range
(Note 2)
V
CC
Voltage on ABP (from V
CC
or IN1–IN4) to
ensure the device is fully operational
2.7 5.5
V
Undervoltage Lockout V
UVLO
Minimum voltage on ABP (from V
CC
or
IN1–IN4) to ensure the device is EEPROM
configured
2.5 V
V
CC
= 5.5V, IN1–IN4 = 3.3V, no load 1.8 3
Supply Current I
CC
Configuration registers or memory access,
no load
2.5 4
mA
IN1–IN4 (in 20mV increments)
1.00 5.50
IN_ Threshold Range V
TH
IN1–IN4 (in 10mV increments)
0.50 3.05
V
T
A
= 0°C to +85°C
0.5V < IN_ < 5.5V, IN_
falling for UV, rising for
OV
-1.5 +1.5
%
2V < IN_ < 5.5V, IN_
falling for UV, rising for
OV (20mV increments)
-2.5 +2.5
%
1V < IN_ < 2V, IN_
falling for UV, rising for
OV (20mV increments)
-50
+50
mV
1V < IN_ < 3.05V, IN_
falling for UV, rising for
OV (10mV increments)
-2.5 +2.5
%
Threshold Accuracy
T
A
= -40°C to
+85°C
0.5V < IN_ < 1V, IN_
falling for UV, rising for
OV (10mV increments)
-25
+25
mV
Threshold Hysteresis
V
TH_HYS
0.5
%V
TH
RESET Threshold Tempco ∆V
TH/C
50
ppm/°C
MAX6876
EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
, IN1–IN4 = +2.7V to +5.5V; ENABLE = MARGIN = MR = ABP = TRKEN; T
A
= -40°C to +85°C, unless otherwise specified.
Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Tracking-Differential-Voltage Hold
Ramp (Note 3)
V
TRK
V
OUT_
> V
TH_PL
V
OUT_
< V
TH_PG
95
125
155 mV
Tracking-Differential-Voltage
Hysteresis
25 mV
Tracking-Differential FAULT
Voltage (Note 3)
V
TRK_F
V
OUT_
> V
TH_PL
V
OUT_
< V
TH_PG
200
250
300 mV
00 20 25 30
01 40 50 60
10 80
100
120
FAULT Timeout Period (Note 4)
t
FAULTUP
,
t
FAULTDOWN
Register
contents
(Table 16)
11 160
200
240
ms
FAULT to GATE Delay t
FG
2µs
IN1–IN4 Input Impedance R
IN1-4
For IN_ voltages < the highest IN_ supply 55 90 145 kΩ
OUT1–OUT4 Input Impedance
R
OUT1-4
OUT_ pulldown disabled 70
100
130 kΩ
Power-On Delay t
PO
V
ABP
≥ V
UVLO
3ms
IN_ to GATE_ Delay
t
D-GATE
IN_ falling/rising, 100mV overdrive 6 µs
OUT_ rising, 100mV overdrive 3 ms
OUT_ to PG_ Delay t
POK
OUT_ falling, 100mV overdrive 25 µs
000 25 µs
001 10
12.5
15
010 20 25 30
011 40 50 60
100 80
100
120
101 160
200
240
110 320
400
480
GATE, RESET, Autoretry Timeout
Period (Notes 5, 6)
t
RESET,
t
AUTO,
t
GATE
Register
contents
(Table 16)
111
1280 1600 1920
ms
00 10
12.5
15
01 40 50 60
10 80
100
120
OC Timeout Period t
OC
Register
contents
(Table 16)
11 160
200
240
ms
T
A
= 0°C to +85°C 560 800 1040
00
T
A
= -40°C to 0°C 480 800 1120
T
A
= 0°C to +85°C 280 400
520
01
T
A
= -40°C to 0°C 240 400
560
T
A
= 0°C to +85°C 140 200
260
10
T
A
= -40°C to 0°C 120 200
280
T
A
= 0°C to +85°C
70
100
130
Track/Sequence Slew Rate Rising
or Falling
TRK
SLEW
Register
contents
(Table 16)
11
T
A
= -40°C to 0°C
60
100
140
V/s
00
96.25 97.5 98.75
01
93.75
95
96.25
10
91.25 92.5 93.75
IN_ to OUT_ Overcurrent
Threshold
V
TH_OC
Register
contents
(Table 16),
OUT_ falling
11
88.75
90
91.25
%
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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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