Datasheet

TPS72710 , TPS72711 , TPS72715 , TPS727185 , TPS72718 , TPS72719 , TPS72725
TPS72727 , TPS727285 , TPS72728 , TPS72730 , TPS72733 , TPS72748 , TPS72750
SBVS128D –JUNE 2009–REVISED FEBRUARY 2014 www.ti.com
8 Applications and Implementation
8.1 Application Information
The TPS727xx family of low-dropout (LDO) linear regulators are utralow quiescent current LDOs with excellent
line and ultra-fast load transient performance and are designed for power-sensitive applications.
8.2 Typical Application
8.2.1 TPS72718YFF 2.5 V
IN
to 1.8 V
OUT
at 200 mA
Figure 26. TPS727xxYFFEVM-407 Schematic
8.2.2 Design Requirements
8.2.2.1 Input And Output Capacitor Requirements
Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1-μF to
1.0-μF low equivalent series resistance (ESR) capacitor across the IN terminal and GND input 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 not sufficiently low, a 0.1-μF input
capacitor may be necessary to ensure stability.
The TPS727xx is designed to be stable with standard ceramic capacitors with values of 1.0 μF or larger at the
output. X5R- and X7R-type capacitors are best because they have minimal variation in value and ESR over
temperature. Maximum ESR should be less than 200 mΩ.
8.2.2.2 Transient Response
As with any regulator, increasing the size of the output capacitor reduces over/undershoot magnitude but
increases duration of the transient response.
8.2.3 Detailed Design Procedure
Select desired device based on the output voltage.
Provide an input supply with adequate headroom to account for dropout and output current to account for GND
terminal current, and power the load.
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Product Folder Links: TPS72710 TPS72711 TPS72715 TPS727185 TPS72718 TPS72719 TPS72725 TPS72727
TPS727285 TPS72728 TPS72730 TPS72733 TPS72748 TPS72750