10

FN6832.0

January 22, 2009

With output voltage externally held up higher than the input

voltage:

1. Input is pulled to ground;

2. input is left open circuit; and

3. input is pulled to some intermediate voltage

ISL9016 provides the reverse current protection to limit the

current flow from output to input under these situations. When

input is pulled to ground and output is held to 5.5V, the typical

reverse current from output to input side is less than 8µA.

Input and Output Capacitors

The ISL9016 provides a linear regulator that has low

quiescent current, fast transient response, and overall stability

across the recommended operating conditions. A ceramic

capacitor (X5R or X7R) with a capacitance of 1µF to 4.7µF

with an ESR up to 200m

Ω is suitable for ISL9016 to maintain

its output stability. The ground connection of the output

capacitor should be connected directly to the GND pin of the

device, and also placed close to the device. Similarly for the

input capacitor, usually a 1µF ceramic capacitor (X5R or X7R)

is suitable for most cases, but if large, fast rising-time load

transient condition is expected, a higher value input capacitor

may be necessary to achieve better performance.

Board Layout Recommendations

A good PCB layout will be an important step to achieve good

performance. It is recommended to design the board with

separate ground planes for input and output, and connect

both ground planes at the GND pin of the device.

Consideration should be taken when placing the

components and route the trace to minimize the ground

impedance, as well as keep the parasitic inductance low.

Usually the input/output capacitors should be placed close to

the device with good ground connection.

ISL9016