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, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

The TLV704 LDO regulator is designed for battery-powered applications and is a good attachment to low-power

microcontrollers (such as the MSP430) because of the device low IQ performance across the entire load current

range. The ultra-low supply current of the TLV704 maximizes efficiency at light loads, and the high input voltage

range and flexibility of output voltage selection in fixed output levels makes the device applicable for supplies

such as unconditioned solar panels.

8.2 Typical Application

IN

OUT

TLV70433

GND

V

IN

V

OUT

0.1μF

GND

1μF

MCU

Figure 8-1. Typical Application

8.2.1 Design Requirements

Select the desired device based on the output voltage.

Provide an input supply with adequate headroom to account for dropout and output current to account for the

GND terminal current, and power the load.

8.2.2 Detailed Design Procedure

8.2.2.1 External Capacitor Requirements

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. Generally, 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.

8.2.2.2 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. Use an input capacitor if the source impedance is more than 0.5 Ω. A higher value capacitor can 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 by using a large output capacitor. Use an output capacitor within

the range specified in the Recommended Operating Conditions table for stability.

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TLV704

SBVS148F – SEPTEMBER 2010 – REVISED MARCH 2023

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