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TLV70028-Q1 Datasheet(PDF) 11 Page - Texas Instruments

Part # TLV70028-Q1
Description  200-mA Low-IQ Low-Dropout Regulator for Portable Devices
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV70028-Q1 Datasheet(HTML) 11 Page - Texas Instruments

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TLV70012A-Q1, TLV70025-Q1, TLV70028-Q1
TLV70030-Q1, TLV70032-Q1, TLV70033-Q1
www.ti.com
SLVSA61G – FEBRUARY 2010 – REVISED SEPTEMBER 2015
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
The TLV700xx-Q1 belongs to a new family of next-generation value LDO regulators. The device consumes low
quiescent current and delivers excellent line and load transient performance. These characteristics, combined
with low noise, very good PSRR with little (VIN – VOUT) headroom, make this device ideal for RF portable
applications. This family of regulators offers subband-gap output voltages down to 0.7 V, current limit, and
thermal protection, and is specified from –40°C to 125°C.
8.1.1 Input and Output Capacitor Requirements
1.0-
μF X5R- and X7R-type ceramic capacitors are recommended because these capacitors have minimal
variation in value and equivalent series resistance (ESR) over temperature.
However, the TLV700xx-Q1 is designed to be stable with an effective capacitance of 0.1
μF or larger at the
output. Thus, the device is stable with capacitors of other dielectric types as well, as long as the effective
capacitance under operating bias voltage and temperature is greater than 0.1
μF. This effective capacitance
refers to the capacitance that the LDO sees under operating bias voltage and temperature conditions; that is, the
capacitance after taking both bias voltage and temperature derating into consideration. In addition to allowing the
use of cheaper dielectrics, this capability of being stable with 0.1-
μF effective capacitance also enables the use
of smaller-footprint capacitors that have higher derating in size- and space-constrained applications.
Note that using a 0.1-
μF rated capacitor at the output of the LDO does not ensure stability because the effective
capacitance under the specified operating conditions would be less than 0.1
μF. Maximum ESR should be less
than 200 m
Ω.
Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1-
μF to 1-
μF, low-ESR capacitor across the IN pin and GND in of the regulator. This capacitor counteracts reactive input
sources and improves transient response, noise rejection, and ripple rejection. A higher-value capacitor may be
necessary if large, fast rise-time load transients are anticipated, or if the device is not located close to the power
source. If source impedance is more than 2
Ω, a 0.1-μF input capacitor may be necessary to ensure stability.
8.1.2 Board Layout Recommendations to Improve PSRR and Noise Performance
Input and output capacitors should be placed as close to the device pins as possible. To improve ac performance
such as PSRR, output noise, and transient response, it is recommended that the board be designed with
separate ground planes for VIN and VOUT, with the ground plane connected only at the GND pin of the device. In
addition, the ground connection for the output capacitor should be connected directly to the GND pin of the
device. High-ESR capacitors may degrade PSRR performance.
8.1.3 Transient Response
As with any regulator, increasing the size of the output capacitor reduces over-/undershoot magnitude but
increases the duration of the transient response.
8.1.4 Thermal Information
Thermal protection disables the output when the junction temperature rises to approximately 160°C, allowing the
device to cool. When the junction temperature cools to approximately 140°C, the output circuitry is again
enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection
circuit may cycle on and off. This cycling limits the dissipation of the regulator, protecting it from damage as a
result of overheating.
Copyright © 2010–2015, Texas Instruments Incorporated
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Product Folder Links: TLV70012A-Q1 TLV70025-Q1 TLV70028-Q1 TLV70030-Q1 TLV70032-Q1 TLV70033-Q1


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