DA6251.002

27 October, 2017

18 (21)

DEVICE OUTLINE CONFIGURATION

Top Marking Information:

6251 = Product Number

VVV = Version Number

YWW = Year Week

QFN-16 3.0x3.0x0.75 PIN DESCRIPTION

Pin Name

Pin

Type

Function

Note

RLED

1

AIO

LED current adjustment resistor

ILED

2

AO

LED current sink

GND

3-4

G

Supply ground

VOUT

5-6

AO

Boost DC/DC converter voltage output

PS

7

P

Power save pin

1

VIN

8

P

Positive supply voltage input

SW

9-10

AO

Boost DC/DC converter switch

VOB

11

AO

Piezo driver brass terminal output

VOS

12

AO

Piezo driver silver terminal output

FEED

13

AI

Piezo driver feedback terminal input

DIN

14

DI

DC/DC and Piezo Drive ON (HIGH) / OFF (LOW) control

CTRL

15

DI

LED current sink ON (HIGH) / OFF (LOW) control

FB

16

AI

Boost DC/DC converter output voltage feedback input

EXP_PAD

-

G

Exposed thermal pad connected to GND

2

G = Ground, P = Power, D = Digital, A = Analog, I = Input, O = Output

Note 1: Normally the PS pin is connected to VIN. This offers reduced power consumption as part of electrical charge from piezo load is

transferred back to input. In case the VOUT voltage is below 7V the PS pin should be connected GND for best efficiency. For example when

driving only one or two 3V LEDs the PS pin should be connected to GND. See figure 4.

Note 2: On PCB the exposed thermal pad must be connected to GND plane using thermal vias functioning as thermal heat sink.