ADP5020ACPZ-R7 datasheet(11/28 Pages) AD

11 / 28 page

ADP5020

Rev. 0 | Page 11 of

VIN = 4.5 V, VOUT1 = 2.8 V, VOUT2 = VOUT3 = 1.8 V, IOUT = 100 mA, C4 = C1 = 10 μF, C2 = 4.7 μF, C3 = 1 μF, TJ = 25°C, unless otherwise noted.

EFF1 (1.1V)

EFF2 (1.2V)

EFF3 (1.3V)

EFF4 (1.4V)

EFF5 (1.5V)

EFF6 (1.6V)

EFF7 (1.7V)

EFF8 (1.8V)

0.90

0.85

0.80

0.75

0.70

0.65

0.60

0.55

0.50

100

150

200

250

300

LOAD CURRENT (mA)

Figure 12. Buck 2 Efficiency vs. Load Current

BUCK 2 OUTPUT = 50mV/DIV

ILOAD = 100mA/DIV

TIME = 100µs/DIV

BUCK 2

ILOAD

Figure 13. Buck 2 Load Transient Response

1.2

1.0

0.8

0.6

0.4

0.2

2.0

2.5

3.0

3.5

4.0

4.5

5.0

INPUT VOLTAGE (V)

ISHTDN (µA) @ –40°C

ISHTDN (µA) @ +25°C

ISHTDN (µA) @ +125°C

Figure 14. Shutdown Current vs. Input Voltage

ENABLE

BUCK 2

BUCK 1 OUTPUT = 2V/DIV

BUCK 2 OUTPUT = 1V/DIV

TIME = 5ms/DIV

Figure 15. Startup Sequence of the Three Regulators, Set by Default

BUCK 2 OUTPUT = 1V/DIV

SW2 OUTPUT = 2V/DIV

TIME = 500µs/DIV

SW2

BUCK 2

Figure 16. Buck 2 Enable Startup

BUCK 1 OUTPUT = 1V/DIV

SW1 OUTPUT = 2V/DIV

TIME = 500µs/DIV

SW1

BUCK 1

Figure 17. Buck 1 Enable Startup

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