cat3604 Catalyst Semiconductor, cat3604 Datasheet - Page 5

• Manufacturer Part Number: cat3604
• Description: 4-channel Regulated Charge Pump White Led Driver
• Manufacturer: Catalyst Semiconductor

Notes: 1 = logic high (or VIN)
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
LED CURRENT SETTING
The LED current is set by the external resistor R
connected between the RSET pin and ground.
Table 1 lists various LED currents and the associ-
ated R
surface mount resistors.
The digital control lines CTR0, CTR1 adn CTR2
allow to turn On or Off a combition of LEDs as
shown in Table 2.
L
C
E
T
D
0
0
0
0
SET
1
1
1
1
R
0 = logic low (or GND)
- = LED output OFF
C
Table 1. RSET Resistor Selection
2
r u
resistor value for standard 1% precision
2
3
1
1
2
5
e r
1
0
5
0
0
n
( t
C
o
m
n
A
r t
C
)
l o
T
0
0
0
0
1
1
1
1
R
L
1
n i
e
s
R
S
4
3
2
E
1
6
2
1
T
9
2
3
5
4
8
C
0
k ( )
9 .
4 .
7 .
4 .
9
7
2
T
0
0
0
0
1
1
1
1
R
0
Table 2: LED Selection
SET
L
O
O
E
-
-
-
-
-
-
D
N
N
5
4
SHORT CIRCUIT DETECT/DISABLE
The unused LED channels can also be turned off by
connecting the respective LED pins to VOUT. In
which case, the corresponding LED driver is disabled
and the typical LED sink current is only about 20 A.
When the following equation is true on any channel,
the driver turns off the LED channel:
Note: The CAT3604 is designed to drive LEDs with
forward voltage greater than 1V and is not compatible
with resistive loads.
VOUT - V
L
O
O
O
E
-
-
-
-
-
D
N
N
N
3
L
E
LED
D
O
u
p t
1V (LED channel OFF)
u
s t
L
O
O
O
O
E
-
-
-
-
D
N
N
N
N
2
Doc. No. 5008, Rev. I
CAT3604
L
O
O
O
O
E
-
-
-
-
N
N
N
N
D
1