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LM2704 Datasheet(PDF) 10 Page - Texas Instruments

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No. de pieza LM2704
Descripción Electrónicos  LM2704 Micropower Step-up DC/DC Converter with 550mA Peak Current Limit
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM2704 Datasheet(HTML) 10 Page - Texas Instruments

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LM2704
SNVS175D – FEBRUARY 2002 – REVISED MAY 2013
www.ti.com
LAYOUT CONSIDERATIONS
The input bypass capacitor CIN, as shown in Typical Application Circuit, must be placed close to the IC. This will
reduce copper trace resistance which effects input voltage ripple of the IC. For additional input voltage filtering, a
100nF bypass capacitor can be placed in parallel with CIN to shunt any high frequency noise to ground. The
output capacitor, COUT, should also be placed close to the IC. Any copper trace connections for the Cout
capacitor can increase the series resistance, which directly effects output voltage ripple. The feedback network,
resistors R1 and R2, should be kept close to the FB pin to minimize copper trace connections that can inject
noise into the system. The ground connection for the feedback resistor network should connect directly to an
analog ground plane. The analog ground plane should tie directly to the GND pin. If no analog ground plane is
available, the ground connection for the feedback network should tie directly to the GND pin. Trace connections
made to the inductor and schottky diode should be minimized to reduce power dissipation and increase overall
efficiency.
Figure 4. White LED Application
Figure 5. Li-Ion 5V Application
Figure 6. Li-Ion 12V Application
10
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