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LTC3218
400mA Single Wire
Camera LED Charge Pump
FEATURES
DESCRIPTION
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Low Noise Constant-Frequency Operation
Multi-Mode Operation: 1x or 2x Boost Mode
Automatic Mode Switching
High Output Current: 150mA (Continuous), 400mA
(Pulsed) From Li-Ion/Polymer Input
2-Second Flash Current Timeout for LED Protection
Automatic Soft-Start
Output Disconnect
No Inductors
220mΩ Internal High Side Current Sense Resistor
Single Resistor Programming Capability
Tiny Application Circuit (3mm × 2mm DFN Package,
All Components < 1mm High)
The LTC ? 3218 is a low-noise, high-current charge pump
DC/DC converter capable of driving high current LEDs at up
to 400mA from a 2.9V to 4.5V input. A low external parts
count (one ?ying capacitor, two programming resistors and
two bypass capacitors at V IN and CPO) make the LTC3218
ideally suited for small, battery-powered applications.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up. High switching frequency enables the
use of small external capacitors. A built-in 2-second timer
protects the LED during ?ash mode.
Output current level is programmed by an external re-
sistor. LED current is regulated using an internal high
side 220mΩ sense resistor. Automatic mode switching
APPLICATIONS
optimizes ef?ciency by monitoring the voltage across the
charge pump and switching modes only when dropout
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LED Torch/Flash Supply for DSCs/Cellphones
is detected. The part is available in a low pro?le 3mm ×
2mm 10-lead DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6411531.
TYPICAL APPLICATION
Ef?ciency vs V IN
2.2μF
100
90
CP
CM
2.9V TO 4.5V
V IN
CPO
80
2.2μF
LTC3218
4.7μF
70
ENF
0
0
1
0 0 (SHUTDOWN)
1 100mA (TORCH)
0 290mA
DISABLED
ENABLED
DISABLED
ENABLED
ENT I LED
ENF
ENT
I SETF
I LED
GND
I SETT
10.2k
1%
LED
AOT2015
60
50
40
2.9
3.1
3.3
3.5
3.7
V IN (V)
3.9
4.1
50mA
150mA
300mA
4.3 4.5
3218 TA01b
1
1
390mA (FLASH)
3218 TA01
3218fb
1
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