MAX16050ETI+T Maxim Integrated Products, MAX16050ETI+T Datasheet - Page 15

• Manufacturer Part Number: MAX16050ETI+T
• Description: IC POWER MONITR/SEQUENCER 28TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX16050ETI+T

• Applications: Power Supply Monitor, Sequencer
• Voltage - Supply: 2.7 V ~ 13.2 V
• Current - Supply: 700µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -

The MAX16050/MAX16051 feature an on-chip charge
pump that drives its output voltage to 5V above V
and it can be used as a pullup voltage to drive one or
more external n-channel MOSFETs (see the Typical
Operating Circuit ). The charge-pump output can be
modeled as a 25µA current source with a compliance
voltage of (V
by connecting a capacitor from the gate of the MOSFET
to ground. When using CP_OUT to provide the pullup
voltage for multiple MOSFETs, ensure that the voltage
is enough to enhance a MOSFET despite the load of
the other pullup resistors (which may be connected to
outputs that are deasserted low).
If any channel is not used, connect the associated SET_
input to ABP. Connect DISC_ of the disabled channel to
GND or leave it unconnected. The channel exclusion
feature adds more flexibility to the device in a variety of
different applications.
The shutdown input (SHDN) initiates a reverse
sequencing event. When SHDN is brought low, the
device will sequentially power down in reverse order.
During this period, all DISC_ inputs are monitored to
make sure the voltage of each supply falls below
250mV before allowing the next supply to shut down.
The next OUT_ goes low as soon as the previous DISC_
input drops below 250mV without any capacitor-adjust-
ed delay. This continues until all supplies are turned off.
SHDN is internally pulled up to ABP.
When EN falls below its threshold, the device performs
a simultaneous power-down and does not reverse
sequence. When either SHDN or EN initializes the
power-down event, the reset output (RESET) immedi-
ately asserts. At the end of the power-down event,
when all DISC_ voltages are below 250mV, the bus
removal output (REM) goes high impedance.
The MAX16050/MAX16051 include a reset output.
RESET is an open-drain output and requires an external
pullup resistor.
When any of the monitored voltages falls below its
threshold, SHDN is pulled low, EN falls below its thresh-
old, or FAULT is pulled low, RESET asserts and stays
asserted for at least the minimum reset timeout period
after all of these conditions are removed. Connect a
CC
Voltage Monitors/Sequencer Circuits with
Charge-Pump Output (CP_OUT)
+ 5V); the slew rate can be controlled
______________________________________________________________________________________
Reset Output ( RESET )
SHDN and EN Inputs
Disabling Channels
Reverse-Sequencing Capability
CC
,
capacitor from TIMEOUT to GND to adjust the reset
timeout period. Connect TIMEOUT to ABP for the fixed
timeout of 128ms (typ). Leave TIMEOUT unconnected
for a 10µs (typ) timeout period.
The FAULT input/output asserts to signal a fault if any of
the SET_ monitored voltages falls below its threshold
while EN = SHDN = high. FAULT is internally pulled up
to ABP by a 100kΩ resistor. FAULT also can be used as
an input. Pull FAULT low to simultaneously shut down
the OUT_ outputs .
For multichip solutions, all of the FAULT input/outputs
can be connected together. In case of a fault condition,
all outputs on every device are turned off and the inter-
nal pulldown circuitry is activated simultaneously.
The MAX16050/MAX16051 include an overvoltage fault
output. OV_OUT is an open-drain output and requires
an external pullup resistor. When any of the SET_ volt-
ages exceed their 0.55V overvoltage threshold,
OV_OUT goes low. When all of the SET_ voltages are
below their overvoltage threshold, OV_OUT goes high
impedance after a short propagation delay.
The discharge inputs (DISC_) discharge power-supply
capacitors during a power-down or fault event and mon-
itor power-supply output voltages during reverse
sequencing. When an OUT_ output goes low, the asso-
ciated DISC_ activates an 85mA pulldown current to dis-
charge any output capacitors. This helps the
power-supply output drop below the 250mV level so the
next power supply can be turned off. During normal
operation, DISC_ is high impedance and will not load
the circuit.
The MAX16050/MAX16051 include an open-drain bus
removal output (REM) that indicates when it is safe to
disconnect the input power after a controlled power-
down operation. REM monitors DISC_ voltages and
goes low when any DISC_ input voltage goes above the
DISC_ power low threshold (V
when all DISC_ inputs are below the DISC_ power low
threshold (V
unsafe to remove a powered board from the bus, con-
nect an LED to REM.
Overvoltage Fault Output ( OV_OUT )
TH_PL
). For a visual signal of when it is
Bus Removal Output (REM)
Discharge Inputs (DISC_)
FAULT Input/Output
TH_PL
). REM goes high
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