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LM9076SX-3.3 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza LM9076SX-3.3
Descripción Electrónicos  LM9076 150mA Ultra-Low Quiescent Current LDO Regulator with Delayed Reset Output
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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LM9076SX-3.3 Datasheet(HTML) 10 Page - Texas Instruments

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LM9076
SNVS260L – NOVEMEBER 2003 – REVISED MARCH 2013
www.ti.com
APPLICATION INFORMATION
REGULATOR BASICS
The LM9076 regulator is suitable for Automotive and Industrial applications where continuous connection to a
battery supply is required (refer to Typical Applications).
The pass element of the regulator is a PNP device which requires an output bypass capacitor for stability. The
minimum bypass capacitance for the output is 10
μF (refer to ESR limitations). A 22 μF, or larger, output bypass
capacitor is recommended for typical applications
INPUT CAPACITOR
The LM9076 requires a low source impedance to maintain regulator stability because critical portions of the
internal bias circuitry are connected to directly to VIN. In general, a 10 μF electrolytic capacitor, located within two
inches of the LM9076, is adequate for a majority of applications. Additionally, and at a minimum, a 0.1
μF
ceramic capacitor should be located between the LM9076 VIN and Ground pin, and as close as is physically
possible to the LM9076 itself .
OUTPUT CAPACITOR
An output bypass capacitor is required for stability. This capacitance must be placed between the LM9076 VOUT
pin and Ground pin, as close as is physically possible, using traces that are not part of the load current path.
The output capacitor must meet the requirements for minimum capacitance and also maintain the appropriate
ESR value across the entire operating ambient temperature range. There is no limit to the maximum output
capacitance as long as ESR is maintained.
The minimum bypass capacitance for the output is 10
μF (refer to ESR limitations). A 22 μF, or larger, output
bypass capacitor is recommended for typical applications.
Solid tantalums capacitors are recommended as they generally maintain capacitance and ESR ratings over a
wide temperature range. Ceramic capacitor types XR7 and XR5 may be used if a series resistor is added to
simulate the minimum ESR requirement. See Figure 24.
Aluminum electrolytic capacitors are not recommended as they are subject to wide changes in capacitance and
ESR across temperature.
Figure 24. Using Low ESR Capacitors
DELAY CAPACITOR
The capacitor on the Delay pin must be a low leakage type since the charge current is minimal (420 nA typical)
and the pin must fully charge to VOUT. Ceramic, Mylar, and polystyrene capacitor types are generally
recommended, although changes in capacitance values across temperature changes will have some effect on
the delay timing.
Any leakage of the IDELAY current, be it through the delay capacitor or any other path, will extend the delay time,
possibly to the point that the Reset pin output does not go high.
SHUTDOWN PIN - LM9076BMA ONLY
The basic On/Off control of the regulator is accomplished with the SHUTDOWN pin. By pulling the SHUTDOWN
pin high the regulator output is switched Off. When the regulator is switched Off the load on the battery will be
primarily due to the SHUTDOWN pin current.
10
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Copyright © 2003–2013, Texas Instruments Incorporated
Product Folder Links: LM9076


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