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CAT3604 датащи(PDF) 4 Page - Catalyst Semiconductor

номер детали CAT3604
подробное описание детали  4-Channel Regulated Charge Pump White LED Driver
PDF  11 Pages
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT3604 датащи(HTML) 4 Page - Catalyst Semiconductor

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CAT3604
4
Doc. No. 5008, Rev. I
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Current
Setting
1.2V Ref
1MHz
Oscillator
Mode Control
1x mode (LDO)
1.5x Charge Pump
VIN
CIN
+
-
3<VIN<4.2V
Battery
EN
RSET
CTR0
CTR1
CTR2
LED1
LED2
LED3
LED4
LED
Output
Select
4 Current
Sink Regulators
COUT
20mA
VOUT
C1-
C2-
C1+
C2+
BLOCK DIAGRAM
BASIC OPERATION
At power-up, the CAT3604 starts operation in 1x
mode. If it is able to drive the programmed LED
current, it continues in 1x mode. If the battery
voltage drops to a level where the LED current
cannot be met, the driver automatically switches
into 1.5x mode. The 1.5x charge pump will boost
the output voltage accordingly to achieve the nomi-
nal LED current.
Figure 1: CAT3604 Functional Block Diagram
The operating mode is reinitialized each and every
time the chip is powered up or is taken out of
shutdown mode (via EN pin). The use of the control
pins (CTR0, CTR1, CTR2) does not reconfigure the
mode of operation.



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