ADP2121 datasheet(9/20 Pages) AD

9 / 20 page

ADP2121

Rev. B | Page 9 of 20

180

160

140

120

100

2.3

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

INPUT VOLTAGE (V)

PWM OPERATION

PFM OPERATION

VOUT = 1.82V

Figure 22. Auto Mode Switching Threshold vs. Input Voltage

110

120

130

140

150

160

170

180

190

2.3

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

INPUT VOLTAGE (V)

VOUT = 1.8V

VOUT = 1.82V

VOUT = 1.85V

VOUT = 1.875V

VOUT = 2.3V

PFM OPERATION

Figure 23. Auto Mode Rising Switching Threshold vs. Input Voltage for All

Voltage Options

100

120

140

160

180

200

2.3

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

INPUT VOLTAGE (V)

VOUT = 1.8V

VOUT = 1.82V

VOUT = 1.85V

VOUT = 1.875V

VOUT = 2.3V

PWM OPERATION

Figure 24. Auto Mode Falling Switching Threshold vs. Input Voltage for All

Voltage Options

TIME (20µs/DIV)

OUTPUT VOLTAGE (50mV/DIV)

LOAD CURRENT (100mA/DIV)

Figure 25. Load Transient Response, 0 mA to 150 mA

(VIN = 2.5 V, Auto Mode)

TIME (20µs/DIV)

OUTPUT VOLTAGE (50mV/DIV)

LOAD CURRENT (100mA/DIV)

Figure 26. Load Transient Response, 0 mA to 150 mA

(VIN = 3.6 V, Auto Mode)

TIME (20µs/DIV)

OUTPUT VOLTAGE (50mV/DIV)

LOAD CURRENT (100mA/DIV)

Figure 27. Load Transient Response, 0 mA to 150 mA

(VIN = 4.5 V, Auto Mode)

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