cat3604v Catalyst Semiconductor, cat3604v Datasheet - Page 8

• Manufacturer Part Number: cat3604v
• Description: 4-channel Quad-mode? Led Driver With Open/short Led Detection
• Manufacturer: Catalyst Semiconductor

CAT3604V
PIN DESCRIPTION
PIN FUNCTION
VIN is the supply pin for the charge pump. A small
1μF ceramic bypass capacitor is required between the
VIN pin and ground near the device. The operating
input voltage range is from 2.5V to 5.5V. Whenever
the input supply falls below the under-voltage
threshold (1.8V), all the LED channels are disabled
and the device enters shutdown mode.
EN is the enable input and the high resolution PWM
dimming control. Levels of logic high and logic low are
set at 1.3V and 0.4V respectively. When EN is initially
taken high, the device becomes enabled and all LED
currents are set according to the R
place the device into “zero current” shutdown mode,
the EN pin must be held low for at least 1.5ms.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1μF ceramic bypass
capacitor is required between the V
near the device.
GND is the ground reference for the charge pump. The
pin must be connected to the ground plane on the PCB.
Doc. No. MD-5029, Rev. B
Pin #
TAB
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
VOUT
Name
RSET
LED4
LED3
LED2
LED1
GND
GND
C1+
C2+
VIN
C1-
C2-
NC
NC
NC
EN
Device enable (active high).
Not connected inside the package.
Not connected inside the package.
Not connected inside the package.
Connect resistor RSET to set the LED current.
Charge pump output connected to the LED anodes.
Bucket capacitor 1 Positive terminal
Bucket capacitor 1 Negative terminal
Bucket capacitor 2 Negative terminal
Bucket capacitor 2 Positive terminal
Ground Reference
LED4 cathode terminal.
LED3 cathode terminal.
LED2 cathode terminal.
LED1 cathode terminal.
Function
Charge pump input, connect to battery or supply.
Connect to GND on the PCB.
OUT
SET
pin and ground
resistor. To
8
C1+, C1- are connected to each side of the ceramic
bucket capacitor C
C2+, C2- are connected to each side of the ceramic
bucket capacitor C
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. If an LED pin is
directly tied to VOUT, that channel is disabled.
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
current for the LEDs. The voltage at this pin regulated
to 0.6V. The ground side of the external resistor
should be star connected back to the GND of the
PCB. In shutdown mode, RSET beomes high
impedance.
1
2
.
.
Characteristics subject to change without notice
© Catalyst Semiconductor, Inc.
SET
) to set the