www.analog.com

Analog Devices │ 5

ADPL21610

1.1A Step-Up DC/DC

Converter with Integrated Soft-Start

Pin Configurations

Pin Description

TOP VIEW

9

DDB PACKAGE

8-LEAD (3mm × 2mm) PLASTIC DFN

TJMAX = 125°C, θJA = 80°C/W

EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

5

6

7

8

4

3

2

1

FB

GND

SW

SW

SHDN

SS

VIN

GND

6 VIN

5 SS

4 SHDN

SW 1

TOP VIEW

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

TJMAX = 125°C, θJA = 165°C/W, θJC = 102°C/W

GND 2

FB 3

Figure 9. Pin Configurations

PIN

NAME

FUNCTION

DFN

TSOT

1

3

FB

Feedback Pin. Reference voltage is 1.255V.

Connect the resistive divider tap here. Minimize the trace area at FB.

Set VOUT = 1.255V(1 + R1/R2).

2, 5, 9

2

GND

Ground. Tie directly to the local ground plane.

3, 4

1

SW

Switch Pin. (Collector of internal Negative-positive-negative (NPN) power switch).

Connect the inductor/diode here and minimize the metal trace area connected to

this pin to minimize Electromagnetic interference (EMI).

6

6

VIN

Input Supply Pin. Must be locally bypassed.

7

5

SS

Soft-Start Pin. Place a soft-start capacitor here. Upon start-up, 4μA of current

charges the capacitor to 1.255V. Use a larger capacitor for a slower start-up.

Leave floating if not in use.

8

4

SHDN

Shutdown Pin. Tie to 2.4V or more to enable the device. Ground to shut down.