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MAX6877ETG+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
MAX6877/MAX6878/MAX6879
Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
______________________________________________________________________________________ 13
Pin Description
PIN
MAX6877
MAX6878 MAX6879
NAME FUNCTION
11—V
CC
Optional Supply Voltage Input. Connect V
CC
to an alternate (i.e., always-on)
supply if desired. Leave V
CC
unconnected, if not used. V
CC
allows IN_
supplies less than UVLO to be tracked. V
CC
is internally pulled down by a
100kΩ resistor.
221ABP
Internal Supply Bypass Input. Bypass ABP with a 1µF capacitor to GND. ABP
maintains the device supply voltage during rapid power-down conditions.
3——SET3
442SET2
553SET1
Externally Adjusted IN_ Undervoltage Lockout Threshold. Connect SET_ to
an external resistor-divider network to set the desired undervoltage threshold
for each IN_ supply (see the Typical Application Circuit). All SET_ inputs
must be above the internal SET_ threshold (0.5V) to enable tracking or
sequencing functionality.
—
3, 16, 17,
22
—N.C. No Connection. Not internally connected.
664EN/UV
Logic-Enable Input or Undervoltage Lockout Monitor Input. EN/UV must be
high (EN/UV > V
EN_R
) to enable voltage tracking or sequencing power-up
operation. OUT_ begins tracking down when EN/UV < V
EN_F
. Connect EN/UV
to an external resistor-divider network to set the external UVLO threshold.
775GND Ground
886DELAY
Tracking Startup/Sequence Delay Select Input. Connect a capacitor from
DELAY to GND to select the desired delay period before tracking is enabled
(after all SET_ inputs and EN/UV are above their respective thresholds) or
between supply sequences. Leave DELAY unconnected for the default
200µs delay period.
997SLEW
Slew-Rate Adjustment Input. Connect a capacitor from SLEW to GND to
select the desired OUT_ slew rate.
10 10 —
TIMEOUT
PG/RST Timeout Period Adjust Input. PG/RST asserts high after the timeout
period when all OUT_ exceed their IN_ referenced threshold. Connect a
capacitor from TIMEOUT to GND to set the desired timeout period. Leave
TIMEOUT unconnected for the default 200µs delay period.
11 11 8
LTCH/RTR
Latch/Autor etr y S el ecti on Inp ut. D r i ve L TC H/RTR l ow to sel ect the l atch m od e.
C onnect L TC H/RTR to ABP or l eave unconnected to sel ect autor etr y m od e.
L TC H/RTR i s i nter nal l y p ul l ed up to ABP thr oug h a 10µA cur r ent sour ce.
12 12 9
TRK/SEQ
Track/Sequence Select Input. Drive TRK/SEQ low to enable supply tracking
function. Connect TRK/SEQ to ABP or leave it unconnected to enable supply
sequencing. TRK/SEQ is internally pulled to ABP through a 10µA current
source.
13 13 — MARGIN
Margin Input, Active-Low. Drive MARGIN low to enable margin mode (see
the Margin Input (
MARGIN
) section). The MARGIN functionality is disabled
(returns to normal monitoring mode) after MARGIN returns high. MARGIN is
internally pulled up to ABP through a 10µA current source.
MAX6877/MAX6878/MAX6879
Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
14 ______________________________________________________________________________________
Pin Description (continued)
PIN
MAX6877
MAX6878 MAX6879
NAME FUNCTION
14 14 — PG/RST
Power-Good Output, Open-Drain. PG_RST asserts high t
TIMEOUT
after all
OUT_ voltages exceed the V
TH_PG
thresholds.
15 15 10
FAULT
Tracking Fault Alert Output, Active Low, Open-Drain. FAULT asserts low if a
tracking failure is present for longer than the selected fault period or if
tracking voltages fail by more than ±250mV. FAULT asserts low if any OUT_
falls below the corresponding IN_ voltage.
16 — — OUT3
Channel 3 Monitored Output Voltage. Connect OUT3 to the source of an n-
channel FET. A fault condition activates a 100Ω pulldown to ground.
17 — — GATE3
Gate Drive for External n-Channel FET. An internal charge pump boosts
GATE3 to V
IN3
+ 5V to fully enhance the external n-channel FET when power-
up is complete.
18 18 11 OUT2
Channel 2 Monitored Output Voltage. Connect OUT2 to the source of an
n-channel FET. A fault condition activates a 100Ω pulldown to ground.
19 19 12 GATE2
Gate Drive for External n-Channel FET. An internal charge pump boosts
GATE2 to V
IN2
+ 5V to fully enhance the external n-channel FET when power-
up is complete.
20 20 13 OUT1
Channel 1 Monitored Output Voltage. Connect OUT1 to the source of an
n-channel FET. A fault condition activates a 100Ω pulldown to ground.
21 21 14 GATE1
Gate Drive for External n-Channel FET. An internal charge pump boosts
GATE1 to V
IN1
+ 5V to fully enhance the external n-channel FET when power-
up is complete.
22 — — IN3
23 23 15 IN2
24 24 16 IN1
Supply Input Voltage. IN1, IN2, or IN3 must be greater than the internal
undervoltage lockout (V
ABP
= 2.7V) to enable the tracking or sequencing
functionality. Each IN_ input is simultaneously monitored by SET_ inputs to
ensure all supplies have stabilized before power-up is enabled. If IN_ is
connected to ground or left unconnected and SET_ is above 0.5V, then no-
sequencing control is performed on that channel. Each IN_ is internally
pulled down by a 100kΩ resistor.
EP EP EP EP Exposed Paddle. Connect exposed paddle to ground.
MAX6877/MAX6878/MAX6879
Dual-/Triple-Voltage, Power-Supply
Trackers/Sequencers/Supervisors
______________________________________________________________________________________ 15
Functional Diagram
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX6877ETG+T

Mfr. #:
Buy MAX6877ETG+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Triple Power-Sup Sequencer
Lifecycle:
New from this manufacturer.
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