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TPS7A03 Datasheet(PDF) 23 Page - Texas Instruments

No. de pieza TPS7A03
Descripción Electrónicos  TPS7A03 Nanopower IQ, 200-nA, 200-mA, Low-Dropout Voltage Regulator With Fast Transient Response
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TPS7A03 Datasheet(HTML) 23 Page - Texas Instruments

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TPS7A03
www.ti.com
SBVS375B – JULY 2019 – REVISED APRIL 2020
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Copyright © 2019–2020, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
8.1.1 Recommended Capacitor Types
The device is designed to be stable using low equivalent series resistance (ESR) ceramic capacitors at the input
and output. Multilayer ceramic capacitors have become the industry standard for these types of applications and
are recommended, but must be used with good judgment. Ceramic capacitors that employ X7R-, X5R-, and
C0G-rated dielectric materials provide relatively good capacitive stability across temperature, whereas the use of
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor type selected, the effective capacitance varies with operating voltage and
temperature. As a rule of thumb, expect the effective capacitance to decrease by as much as 50%. The input
and output capacitors recommended in the Recommended Operating Conditions table account for an effective
capacitance of approximately 50% of the nominal value.
8.1.2 Input and Output Capacitor Requirements
Although an input capacitor is not required for stability, good analog design practice is to connect a capacitor
from IN to GND. This capacitor counteracts reactive input sources and improves transient response, input ripple,
and PSRR. An input capacitor is recommended if the source impedance is more than 0.5 Ω. A higher value
capacitor may be necessary if large, fast rise-time load or line transients are anticipated or if the device is located
several inches from the input power source.
Dynamic performance of the device is improved with the use of an output capacitor. Use an output capacitor
within the range specified in the Recommended Operating Conditions table for stability.
8.1.3 Load Transient Response
The load-step transient response is the output voltage response by the LDO to a step in load current, whereby
output voltage regulation is maintained. There are two key transitions during a load transient response: the
transition from a light to a heavy load and the transition from a heavy to a light load. The regions shown in
Figure 59 are broken down as follows. Regions A, E, and H are where the output voltage is in steady-state.
Figure 59. Load Transient Waveform
During transitions from a light load to a heavy load, the:
Initial voltage dip is a result of the depletion of the output capacitor charge and parasitic impedance to the
output capacitor (region B)
Recovery from the dip results from the LDO increasing its sourcing current, and leads to output voltage
regulation (region C)


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