ADP196

Data Sheet

Rev. 0 | Page 10 of 12

APPLICATIONS INFORMATION

CAPACITOR SELECTION

Output Capacitor

The ADP196 is designed for operation with small, space-saving

ceramic capacitors but functions with most commonly used

capacitors when the effective series resistance (ESR) value is

carefully considered. The ESR of the output capacitor affects the

response to load transients. A typical 1 µF capacitor with an ESR of

0.1 Ω or less is recommended for good transient response. Using a

larger value of output capacitance improves the transient response

to large changes in load current.

Input Bypass Capacitor

Connecting at least 1 µF of capacitance from VIN to GND reduces

the circuit sensitivity to the PCB layout, especially when high

source impedance or long input traces are encountered. When

more than 1 µF of output capacitance is required, increase the

input capacitance to match it.

GROUND CURRENT

The major source of ground current in the ADP196 is the internal

charge pump for the FET drive circuitry. Figure 22 shows the

to 5.5 V.

0

5

10

15

20

25

30

35

40

45

50

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

50mA

100mA

200mA

500mA

1000mA

3000mA

ENABLE FEATURE

The ADP196 uses the EN pin to enable and disable the VOUT

pin under normal operating conditions. As shown in Figure 23,

the EN pin crosses the inactive threshold, VOUT turns off.

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0

0.2

0.4

0.6

0.8

1.0

1.2

ENABLE VOLTAGE (V)

Figure 23. Typical EN Pin Operation

As shown in Figure 23, the EN pin has built-in hysteresis. The

hysteresis prevents on/off oscillations that can occur due to

noise on the EN pin as it passes through the threshold points.

voltage; therefore, these thresholds vary with changing input

voltage. Figure 24 shows the typical EN active/inactive thresholds

when the input voltage varies from 1.8 V to 5.5 V.

0

0.2

0.4

0.6

0.8

1.0

1.2

1.8

2.2

2.6

3.0

3.4

3.8

4.2

4.6

5.0

5.4

INPUT VOLTAGE (V)

EN RISE

EN FALL