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PDF LM3880 Data sheet ( Hoja de datos )
| Número de pieza | LM3880 | |
| Descripción | Power Sequencer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3880 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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www.DataSheet4U.com
September 2006
LM3880
Power Sequencer
General Description
The LM3880 Power Sequencer offers the easiest method to
control power up and power down of multiple power supplies
(switchers or linear regulators). By staggering the startup
sequence, it is possible to avoid latch conditions or large
in-rush currents that can affect the reliability of the system.
Available in a SOT23-6 package, the Power Sequencer
contains a precision enable pin and three open drain output
flags. Upon enabling the LM3880 the three output flags will
sequentially release, after individual time delays, permitting
the connected power supplies to startup. The output flags
will follow a reverse sequence during power down to avoid
latch conditions.
Standard timing option of 30ms is available.
EPROM capability allows every delay and sequence to be
fully adjustable. Contact National Semiconductor if a non-
standard configuration is required.
Features
n Easiest method to sequence rails
n Power up and power down control
n Input voltage range of 2.7V to 5.5V
n Small footprint SOT23-6
n Low quiescent current of 20 µA
n Standard timing options available
n Customization of timing and sequence available through
factory programmability
Applications
n Multiple supply sequencing
n Microprocessor / Microcontroller sequencing
n FPGA sequencing
Typical Application Circuit
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© 2006 National Semiconductor Corporation DS201926
www.national.com
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Typical Performance Characteristics
Quiescent Current vs VCC
Quiescent Current vs Temperature (VCC = 3.3V)
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Enable Threshold vs Temperature
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Time Delay (30ms) vs VCC
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Time Delay Ratio vs Temperature
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Time Delay (30ms) vs Temperature
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5
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Application Information (Continued)
Power Down Sequence Options
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11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM3880.PDF ] | |
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