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| CAT3606HV4-T2 Datasheet, PDF (4/12 Pages) ON Semiconductor – 6-Channel Low Noise Charge Pump White LED Driver | |||
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CAT3606
BLOCK DIAGRAM
Battery
VIN
3V to 4.2V
VIN
CIN
1µF
EN
1µF
1µF
C1-
C1+ C2-
C2+
1x mode (LDO)
1.5x Charge Pump
1MHz
Oscillator
Mode Control
RSET
24kâ¦
RSET
ENM
ENS
1.2V Ref
Current
Setting
LED Output
Select
Main
Sub
GND
VOUT
LED1
LED2
LED3
LED4
LED5
LED6
6 Current
Sink Regulators
COUT
1µF
20mA
Figure 2. CAT3606 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3606 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, to
boost the output voltage high enough to achieve the
nominal LED current.
The above sequence 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 Main and
Sub display enable pins (E¯N¯¯M or E¯N¯¯S) does not affect
the mode of operation.
Doc. No. MD-5009 Rev. D
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
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