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PDF MAX6877 Data sheet ( Hoja de datos )
| Número de pieza | MAX6877 | |
| Descripción | Dual-/Triple-Voltage Power-Supply Trackers/Sequencers/Supervisors | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3771; Rev 0; 7/05
www.DataSheet4U.com
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
100Ω pulldown 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 100Ω Pulldown 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.
1 page  
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Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
EN/UV
VEN_R
IN_
OUT_
BUS VOLTAGE MONITORED THROUGH EN/UV INPUT
IN1 = 2.5V
IN2 = 1.8V
IN3 = 0.7V
MONITORED THROUGH SET THRESHOLDS ON SET_ INPUTS
CAPACITOR-
ADJUSTED
SLEW RATE OUT1 = 2.5V
OUT2 = 1.8V
OUT3 = 0.7V
PG/RST
FAULT = HIGH
tDELAY
tTIMEOUT
FORCED INTO QUICK SHUTDOWN AFTER NORMAL SHUTDOWN WHEN IN1 GOES BELOW ITS SET VOLTAGE
Figure 2. Tracking in Fast Shutdown Mode
EN/UV
VEN_F
IN1 GOES BELOW
SET1 THRESHOLD
_______________________________________________________________________________________ 5
5 Page 
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Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
Typical Operating Characteristics
(VCC_ = 2.7V to 5.5V, CSLEW = 200pF, EN = MARGIN = ABP, TA = +25°C, unless otherwise noted.)
VCC SUPPLY CURRENT
vs. INPUT VOLTAGE
1.4
1.3
1.2 TA = +85°C
1.1
TA = +25°C
1.0
TA = -40°C
0.9
0.8
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
-40
NORMALIZED SET_ THRESHOLD
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
DELAY TIMEOUT
vs. CDELAY
1000
100
10
1
0.1
0.0001
0.001
0.01
CDELAY (µF)
0.1
1
NORMALIZED POWER-GOOD TIMEOUT
vs. TEMPERATURE
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
-40
-15 10 35 60
TEMPERATURE (°C)
85
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
-40
NORMALIZED DELAY TIMEOUT
vs. TEMPERATURE
-15 10 35 60
TEMPERATURE (°C)
85
NORMALIZED EN/UV THRESHOLD
vs. TEMPERATURE
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
-40
-15 10 35 60
TEMPERATURE (°C)
85
POWER-GOOD TIMEOUT
vs. CTIMEOUT
1000
100
10
1
0.1
0.0001
10,000
0.001 0.01
0.1
CTIMEOUT (µF)
SLEW RATE
vs. CSLEW
1
1000
100
10
10
100 1000
CSLEW (pF)
10,000
IN_ TRANSIENT DURATION
vs. IN_ THRESHOLD OVERDRIVE
30
IN_ = 3.3V
27
24
21
18
15
12
PG/RST GOES LOW ABOVE THE CURVE
9
6
3
0
0 50 100 150 200 250 300
IN_ THRESHOLD OVERDRIVE (mV)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX6877.PDF ] | |
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