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TP3-470 Scheda tecnica(PDF) 4 Page - Linear Technology

Il numero della parte TP3-470
Spiegazioni elettronici  500mA Low Voltage Step-Down Synchronous
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

TP3-470 Scheda tecnica(HTML) 4 Page - Linear Technology

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LTC1504A
PIN FUNCTIONS
voltage. The LTC1504A feedback loop will servo the FB pin
to 1.265V.
SENSE (LTC1504A-3.3) (Pin 5): Output Voltage Sense.
Connect directly to the output voltage node. The
LTC1504A-3.3 feedback loop will servo SENSE to 3.3V.
SENSE is connected to an internal resistor divider which
will load any external dividers. For output voltages other
than 3.3V, use the LTC1504A.
SHDN (Pin 6): Shutdown, Active Low. When SHDN is at a
logic High, the LTC1504A will operate normally. When
SHDN is Low, the LTC1504A ceases all internal operation
and supply current drops below 1
µA. In shutdown, the SW
pin is pulled low. This ensures that the output is actively
shut off when SHDN is asserted, but it prevents other
supplies from providing power to the output when the
LTC1504A is inactive. See the Applications Information
section for more details.
SS (Pin 7): Soft Start. Connect an external capacitor
(usually 0.1
µF)fromSStoGNDtolimittheoutputrisetime
during power-up. CSS also compensates the current limit
loop, allowing the LTC1504A to enter and exit current limit
cleanly. See the Applications Information section for more
details.
COMP (Pin 8): External Compensation. An external RC
network should be connected to COMP to compensate the
feedback loop. COMP is connected to the output of the
internal error amplifier.
IMAX (Pin 1): Current Limit Set. Connect a resistor from
VCC to IMAX to set the current limit threshold. An internal
12
µA current source from IMAX to GND sets the voltage
drop across this resistor. This voltage is compared to the
voltage drop across the internal high-side switch (Q1)
while it is turned on. See the Applications Information
section for more information. To disable current limit,
leave IMAX floating.
VCC (Pin 2): Power Supply Input. Connect to a power
supply voltage between 4V and 10V. VCC requires a low
impedance bypass capacitor to ground, located as close
as possible to the LTC1504A. See the Applications Infor-
mation section for details on capacitor selection and
placement.
SW (Pin 3): Power Switch Output. This is the switched
node of the buck circuit. Connect SW to one end of the
external inductor. The other end of the inductor should be
connected to COUT and becomes the regulated output
voltage. Avoid shorting SW to GND or VCC.
GND (Pin 4): Ground. Connect to a low impedance ground.
The input and output bypass capacitors and the feedback
resistor divider (adjustable parts only) should be grounded
as close to this pin as possible. Pin 4 acts as a heat sink
in the LTC1504A S0-8 package and should be connected
to as large a copper area as possible to improve thermal
dissipation. See the Thermal Considerations section for
more information.
FB (LTC1504A) (Pin 5): Feedback. Connect FB to a resistor
divider from VOUT to GND to set the regulated output


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