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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6878 Datasheet

Dual-/Triple-Voltage Power-Supply Trackers/Sequencers/Supervisors

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19-3771; Rev 0; 7/05
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Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
General Description
The MAX6877/MAX6878/MAX6879 multivoltage power
trackers/sequencers/supervisors monitor up to three
system voltages and provide proper power-up and
power-down control for systems requiring voltage track-
ing or sequencing. These devices ensure controlled
voltage tracking within a specified range or sequencing
in the proper order as system power supplies are
enabled. The MAX6877/MAX6878/MAX6879 generate
all required voltages and timing to control up to three
external n-channel pass FETs for the OUT1/OUT2/
OUT3 supply voltages (see the Selector Guide for dif-
ferent features of each device).
The MAX6877/MAX6878/MAX6879 feature adjustable
undervoltage thresholds for each input supply. When all
the voltages are above these adjustable thresholds, the
devices turn on the external n-channel MOSFETs to
either sequence or track the voltages to the system.
During voltage-tracking mode, the voltage at the GATE
of each MOSFET is increased to slowly bring up all
supplies at a controlled slew rate. The MAX6877/
MAX6878/MAX6879 feature an autoretry or latch-off
mode with capacitor-adjusted timing.
These devices also provide a controlled power-down
(tracking mode) when the system shuts off in an orderly
manner. When an unexpected fault occurs, the outputs
are all pulled down simultaneously with an internal
100pulldown to help discharge capactive loads at
the MOSFET’s source. The MAX6877/MAX6878/
MAX6879 feature independent internal charge pumps
to fully enhance the external FETs for low-voltage drop
at highpass current. The MAX6877 and MAX6878 also
feature a power-good output with a selectable timeout
period that can be used for system reset.
The MAX6877/MAX6878/MAX6879 are available in
small 4mm x 4mm 24-pin and 16-pin thin QFN pack-
ages and are fully specified over the -40°C to +85°C
extended operating temperature range.
Multivoltage Systems
Networking Systems
Telecom
Storage Equipment
Servers/Workstations
Applications
Selector Guide appears at end of data sheet.
Features
Pin-Selectable Tracking or Sequencing Control
for Up to Three Supply Voltages
Capacitor-Adjustable Power-Up/Down Tracking
Slew Rate
Capacitor-Adjustable Power-Up Sequencing Delay
Internal Charge Pumps to Enhance External
n-Channel FETs
Capacitor-Adjustable Timeout Period Power-Good
Output (MAX6877/MAX6878)
Adjustable Undervoltage Lockout or
Logic-Enable Input
Internal 100Pulldown for Each Output to
Discharge Capacitive Load Quickly
0.5V to 5.5V Nominal IN_/OUT_ Range
2.7V to 5.5V Operating Voltage Range
Immune to Short Voltage Transients
Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN
Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX6877ETG+ -40°C to +85°C 24 Thin QFN T2444-4
MAX6877ETG
-40°C to +85°C 24 Thin QFN T2444-4
Ordering Information continued at end of data sheet.
+Denotes lead-free package.
Pin Configurations
TOP VIEW
18 17 16 15 14 13
GATE2 19
12 TRK/SEQ
OUT1 20
11 LTCH/RTR
GATE1 21
IN3 22
IN2 23
IN1 24
+
12
MAX6877
EP*
34
5
10 TIMEOUT
9 SLEW
8 DELAY
7 GND
6
4mm x 4mm THIN QFN
*EXPOSED PADDLE CONNECTED TO GND.
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6878 Datasheet

Dual-/Triple-Voltage Power-Supply Trackers/Sequencers/Supervisors

No Preview Available !

Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
IN1, IN2, IN3, VCC ....................................................-0.3V to +6V
ABP
.....................................-0.3V to the highest of VIN1 - VIN3 or VCC
SET1, SET2, SET3 ....................................................-0.3V to +6V
GATE1, GATE2, GATE3 .........................................-0.3V to +12V
OUT1, OUT2, OUT3 .................................................-0.3V to +6V
LTCH/RTR, TRK/SEQ, MARGIN ...............................-0.3V to +6V
FAULT, PG/RST, EN/UV ...........................................-0.3V to +6V
DELAY, SLEW, TIMEOUT .........................................-0.3V to +6V
OUT_ Current....................................................................±50mA
GND Current.....................................................................±50mA
Input/Output Current (all pins except
OUT_ and GND) ...........................................................±20mA
Continuous Power Dissipation (TA = +70°C)
16-Pin 4mm x 4mm Thin QFN
(derate 16.9mW/°C above +70°C) .............................1349mW
24-Pin 4mm x 4mm Thin QFN
(derate 20.8mW/°C above +70°C) .............................1667mW
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
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
(VCC, IN1, IN2, or IN3 = +2.7V to +5.5V, EN/UV = MARGIN = ABP, TA = -40°C to +85°C, unless otherwise specified. Typical values
are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current
SET_ Threshold Range
SET_ Threshold Hysteresis
SET_ Input Current
EN/UV Input Voltage
EN/UV Input Current
EN/UV Input Pulse Width
DELAY, TIMEOUT Output Current
DELAY, TIMEOUT Threshold
Voltage
SLEW Output Current (Note 4)
Track/Sequence Slew-Rate
Timebase Accuracy
Timebase/CSLEW Ratio
Slew-Rate Accuracy during Power-
Up and Power-Down
Power-Good Threshold
SYMBOL
VCC
ICC
VTH
VTH_HYS
ISET
VEN_R
VEN_F
IEN
tEN
ID
CONDITIONS
Voltage on ABP (the highest of VCC or IN_)
to ensure that PG/RST and FAULT are valid
and GATE_ = 0V
Voltage on ABP (the highest of VCC or IN_)
to ensure the device is fully operational
VCC = 5.5V, IN1 = IN2 = IN3 = 3.3V, no load
SET_ falling, TA = +25oC
SET_ falling, TA = -40oC to +85oC
SET_ rising
SET_ = 0.5V
Input rising
Input falling
EN/UV falling, 100mV overdrive
(Notes 2, 3)
VCC = 3.3V
IS
SR CSLEW = 200pF (Note 4)
100pF < CSLEW < 1nF (Note 4)
CSLEW = 200pF, ABP = 5.5V (Note 4)
VTH_PG VOUT_ falling
MIN TYP MAX UNITS
1.4
2.7 5.5
0.4925
0.4875
-100
1.22
-5
7
2.12
1.1
0.5
0.5
0.5
1.286
1.25
2.5
1.8
0.5075
0.5125
+100
1.28
+5
2.88
1.25
22.5 25 27.5
-15 +15
104
-50 +50
91.5 92.5 93.5
V
mA
V
%
nA
V
µA
µs
µA
V
µA
%
k
%
%
2 _______________________________________________________________________________________


Part Number MAX6878
Description Dual-/Triple-Voltage Power-Supply Trackers/Sequencers/Supervisors
Maker Maxim Integrated Products
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MAX6878 Datasheet PDF






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