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34726 Folha de dados(PDF) 13 Page - Freescale Semiconductor, Inc

Nome de Peças 34726
Descrição Electrónicos  300mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode
PDF  19 Pages
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Fabricante Electrônico  FREESCALE [Freescale Semiconductor, Inc]
Página de início  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

34726 Folha de dados(HTML) 13 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
13
34726
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
OVER-TEMPERATURE PROTECTION
To limit its operating temperature, the 34726 shuts down if
the junction temperature of the switching MOSFET
surpasses 140°C. If the junction temperature subsequently
drops to 130°C, the 34726 re-starts.
SOFT-START OPERATION
To limit the in-rush current, an internal timer controls the
output voltage ramp after the part is enabled. The start-up
time is internally set to approximately 2.0ms and is
independent of input voltage, output voltage, or load current.
The soft-start sequence also occurs upon recovery from any
fault condition.
UNDER-VOLTAGE LOCK-OUT
The UVLO threshold is set to 2.7V for rising VIN, and to
2.5V for falling VIN. For a VOUT of 3.3V, the VOUT value will
track VIN below 3.6V until the 2.5V falling VIN threshold is
reached.
If the UVLO falling threshold is met, the part shuts down
and will power up again with soft-start, when the UVLO rising
threshold is surpassed.



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