Datasheet

ADM8845
Rev. C | Page 5 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1V
OUT
2C2+
3I
SET
4FB1
11 C2–
12 CTRL2
10 GND
9 FB6
NOTES
1. CONNECT EXPOSED PADDLE TO GND.
5FB2
6FB3
7FB4
8FB5
15
V
CC
16
C1+
14
C1–
13
CTRL1
TOP VIEW
(Not to Scale)
ADM8845
04867-0-003
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Function
1 V
OUT
Charge Pump Output. A 2.2 µF capacitor to ground is required on this pin. Connect V
OUT
to the anodes of all
the LEDs.
2 C2+ Flying Capacitor 2 Positive Connection.
3 I
SET
Bias Current Set Input. The current, I
SET
, flowing through the resistor, R
SET
, is gained up by 120 to give the I
LED
current. Connect R
SET
to GND to set the bias current as V
SET
/R
SET
. Note that V
SET
= 1.18 V.
4 to 9 FB1 to FB6 LED1 to LED6 Cathode Connection and Charge Pump Feedback. The current, I
SET
, flowing in these LEDs is 120
times the current flowing through resistor, R
SET
. When using fewer than six LEDs, this pin can be left unconnected
or connected to GND.
10 GND Device Ground Pin.
11
C2−
Flying Capacitor 2 Negative Connection.
12 CTRL2 Digital Input. 3 V CMOS Logic. Used with CTRL1 to control the shutdown operation of the main and sub LEDs.
13 CTRL1 Digital Input. 3 V CMOS Logic. Used with CTRL2 to control the shutdown operation of the main and sub LEDs.
14 C1− Flying Capacitor 1 Negative Connection.
15 V
CC
Positive Supply Voltage Input. Connect this pin to a 2.6 V to 5.5 V supply with a 4.7 µF decoupling capacitor.
16 C1+ Flying Capacitor 1 Positive Connection.
- EP Exposed Paddle. Connect the exposed paddle to GND.