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LTC3212
BLOCK DIAGRAM
900kHz
OSCILLATOR
1
CP
11
CM
12
V IN
CPO
2
10k
SHUT
DOWN
3
LEDEN
3 μ A
CONTROL LOGIC
V REF
TSD
DROPOUT
DETECTION
ENR ENG
ENB
4
5
6
I SETB
I SETR
I SETG
ENB
ENR
ENG
LED
CURRENT
SOURCE
LED
CURRENT
SOURCE
LED
CURRENT
SOURCE
LEDB
LEDR
LEDG
9
8
7
OPEN
DETECTION/
AUTOSET
OPERATION
10
GND
3212 BD
The LTC3212 uses a switched capacitor charge pump to
power three LEDs with a programmable regulated cur-
rent. The part powers up into 1x mode. In this mode V IN
is directly connected to CPO. When powering up into 1x
mode, the LTC3212 charges the CPO capacitor to near
V IN before directly connecting V IN to CPO. This prevents
a large in-rush current. 1x mode provides maximum ef-
ficiency and minimum noise. The LTC3212 will remain
in this mode until one of the LED current source drivers
 
begins to drop out of regulation. When this drop out oc-
curs the LTC3212 will switch to 2x mode after a soft-start
period. The part will return to 1x mode when the part is
shut down and reprogrammed.
The current delivered through the LED load is controlled
by an internal programmable low dropout current source.
The current is programmed by resistors connected between
the I SET(R,G,B) pins and GND.
3212fb
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