Data Sheet

ADPL31610

analog.com

Rev. 1

13 of 19

In Figure 23, CSS has increased to 68nF, resulting in a lower peak input current of 600mA with a VOUT ramp time of

1.6ms. CSS or RSS can be increased further for an even slower ramp, if desired. Diode D2 serves to quickly discharge

CSS when VSS is driven low to shut down the device. D2 can be omitted, resulting in a soft-stop slow discharge of the

output capacitor.

Diode Selection

A Schottky diode is recommended for use with the ADPL31610A/ADPL31610B. The Onsemi MBR0520 is a very good

choice. Where the input to output voltage differential exceeds 20V, use the MBR0530 (a 30V diode). These diodes are

rated to handle an average forward current of 0.5A.

Layout Hints

The high-speed operation of the ADPL31610A/ADPL31610B demands careful attention to board layout. It will not

achieve the advertised performance with a careless layout. Figure 26 shows the recommended component

placement. The ground cut at the cathode of D1 is essential for low noise operation.

Figure 26. Suggested Component Placement. Note Cut in Ground Copper at D1’s Cathode

1

2

3

5

4

C2

D1

R2

R1

L1B

C1

L1A

+

SHUTDOWN

–VOUT

GND

VIN

C3