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CAT3644
Table 6. PIN D ESCRIPTION
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TAB
Pin Function
Name
LED2
LED3
LED4
RSET
EN/DIM
VOUT
NC
VIN
C1+
C1 ?
C2+
C2 ?
NC
NC
GND
LED1
GND
Function
LED2 cathode terminal.
LED3 cathode terminal.
LED4 cathode terminal.
Connect resistor RSET to set the LED current.
Device enable (active high) and Dimming Control.
Charge pump output connected to the LED anodes.
Not connected inside the package.
Charge pump input, connect to battery or supply.
Bucket capacitor 1 Positive terminal
Bucket capacitor 1 Negative terminal
Bucket capacitor 2 Positive terminal
Bucket capacitor 2 Negative terminal
Not connected inside the package.
Not connected inside the package.
Ground Reference
LED1 cathode terminal.
Connect to GND on the PCB.
VIN is the supply pin for the charge pump. A small 1 m F
ceramic bypass capacitor is required between the VIN pin
and ground near the device. The operating input voltage
range is from 2.5 V to 5.5 V. Whenever the input supply falls
below the under ? voltage threshold (1.8 V), all the LED
channels are disabled and the device enters shutdown mode.
EN/DIM is the enable and one wire dimming input for all
LED channels. Levels of logic high and logic low are set at
1.3 V and 0.4 V respectively. When EN/DIM is initially
taken high, the device becomes enabled and all LED
currents are set to the full scale according to the resistor
R SET . To place the device into “zero current” shutdown
mode, the EN/DIM pin must be held low for at least 1.5 ms.
VOUT is the charge pump output that is connected to the
LED anodes. A small 1 m F ceramic bypass capacitor is
required between the V OUT pin and ground near the device.
GND is the ground reference for the charge pump. The pin
C1+, C1 ? are connected to each side of the ceramic bucket
capacitor C 1 .
C2+, C2 ? are connected to each side of the ceramic bucket
capacitor C 2 .
LED1 to LED4 provide the internal regulated current
source for each of the LED cathodes. These pins enter
high ? impedance zero current state whenever the device is
placed in shutdown mode.
TAB is the exposed pad underneath the package. For best
thermal performance, the tab should be soldered to the PCB
and connected to the ground plane.
RSET is connected to the resistor (R SET ) to set the full scale
current for the LEDs. The voltage at this pin regulated to
0.6 V. The ground side of the external resistor should be star
connected back to the GND of the PCB. In shutdown mode,
RSET becomes high impedance.
must be connected to the ground plane on the PCB.
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