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LTC3215
BLOCK DIAGRAM
OSCILLATOR
2
C1 +
10
C1 –
1
C2 +
1X MODE: CPO = V IN
1.5X MODE: CPO = 4.6V
2X MODE: CPO = 5.1V
8
C2 –
CPO
3
–
+
V REF
7
V IN
MODE
CONTROL
DROPOUT
DETECTOR
I LED
4
6
EN
CONTROL
LOGIC
GND
CURRENT
SOURCE
CONTROL
I SET
GND
9
5
11
3215 BD
OPERATION
The LTC3215 uses a fractional switched capacitor charge
pump to power a high current LED with a programmed
regulated current. The part starts up into the 1x mode. In
this mode, V IN is directly connected to CPO. This mode
provides maximum efficiency and minimum noise. The
LTC3215 will remain in this mode until the LED current
source begins to dropout. When dropout is detected,
the LTC3215 will switch to 1.5x mode after a soft-start
period. Any subsequent dropout detected will cause the
part to enter 2x mode. The part may be reset to 1x mode
by bringing the part into shutdown mode and then re-
enabling the part.
A two phase nonoverlapping clock activates the charge
pump switches. In the 2x mode, the flying capacitors are
charged on alternate clock phases from V IN . While one
capacitor is being charged from V IN , the other is stacked
on top of V IN and connected to the output. Alternatively, in
the 1.5x mode the flying capacitors are charged in series
during the first clock phase, and stacked in parallel on
top of V IN on the second clock phase. This sequence of
charging and discharging the flying capacitors continues
at a free running frequency of 900kHz (typ).
The current delivered to the LED load is controlled by
the internal programmable current source. The value of
this current may be selected by choosing the appropriate
programming resistor. The resistor is connected between
the I SET pin and GND. The resistor value needed to attain
the desired current level can be determined by Equation 1.
R SET = 3990/I LED (1)
A resistor value of 2k or less (e.g., a short-circuit) will
cause the LTC3215 to enter overcurrent shutdown mode.
This mode will prevent damage to the part by shutting
down the high power sections of the chip.
3215fc
6
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