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TS33000-M018QFNR Scheda tecnica(PDF) 8 Page - Semtech Corporation

Il numero della parte TS33000-M018QFNR
Spiegazioni elettronici  High Efficiency Synchronous DC/DC Buck Converter
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Produttore elettronici  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TS33000-M018QFNR Scheda tecnica(HTML) 8 Page - Semtech Corporation

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TS33000
Final Datasheet
Rev 1.9
May 1, 2015
www.semtech.com
8 of 17
Semtech
Internal Protection Details
Internal Current Limit
Current limit is always active when the regulator is enabled.
High side current limit will shorten the high side on time and
tri-state the high side. Additionally, low side current limit will
protect the low side FET and turn off the switch if current limit
is sensed on the low side switch. Since the output is fully
synchronous, the current limit is protected on the low side in
both the positive and negative direction.
Soft Start
Soft start ensures current limit does not prevent regulator
startup and minimize overshoot at startup. The typical startup
time is 925us. These values do not change with output
voltage, current limit settings, or adjustable/fixed mode. The
soft start is re-triggered with the any rising edge that enables
the regulator, including the EN input pins, thermal shutdown,
VCC Undervoltage, or a VCC Power cycle.
Thermal Shutdown
If the temperature of the die exceeds 170C, the VSW outputs
will tri-state to protect the device from damage. The PG and all
other protection circuitry will stay active to inform the system
of the failure mode. Once the device cools to 160C, the device
will attempt to start up again, following the normal soft start
sequence with 10ms delay on PG. If the device reaches 170C,
the shutdown/restart sequence will repeat.
Output Overvoltage
If the output of the regulator exceeds 106% of the regulation
voltage, the VSW outputs will tri-state to protect the device
from damage. This check occurs at the start of each switching
cycle. If it occurs during the middle of a cycle, the switching
for that cycle will complete, and the VSW outputs will tri-state
at the beginning of the next cycle.
VCC Under-Voltage Lockout
The device is held in the off state until VCC reaches 1.9V. There
is a 100mV hysteresis on this input, which requires the input to
fall below 1.8V before the device will disable.


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