Load

V

BAT

IN

OUT

EN

GND

Device

C

IN

C

OUT

Rated output

current

Output current limited by

dropout

Output current limited by thermals

Limited by

Limited by

26

TPS7A02

SBVS277B – JULY 2019 – REVISED MARCH 2020

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Application Information (continued)

Figure 60 shows the recommended area of operation for this device on a JEDEC-standard high-K board with a

Figure 60. Region Description of Continuous Operation Regime

8.2 Typical Application

Figure 61. Operation From a Battery Input Supply

8.2.1 Design Requirements

Table 2. Design Parameters

PARAMETER

DESIGN REQUIREMENT

Input voltage

1.8 V to 3.0 V (two 1.5-V batteries)

Output voltage

1.0 V, ±1%

Input current

200 mA, maximum

Output load

10-mA DC

Maximum ambient temperature

70°C

8.2.2 Detailed Design Procedure

For this design example, the 1.0-V, fixed-version TPS7A0210 is selected. A dual AA Alkaline battery was used,

thus a 1.0-µF input capacitor is recommended to minimize transient currents drawn from the battery. A 1.0-µF

within the TPS7A02 dropout voltage specification for the 1.0-V output voltage option to keep the device in

regulation under all load and temperature conditions for this design. Use the recommend 1-µF input and output

capacitor because the input source has a high equivalent series resistor (ESR) of 600 mΩ (typ). The very small

ground current consumed by the regulator maintains a high current efficiency as compared to the load current

consumed by the system, as shown in Figure 62 which allows for long battery life. Equation 6 can be used to

(6)