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LT3467A Datasheet

  • LT3467A

  • 1A Low Noise High Current LED Charge Pump with Independent T...

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LTC3216
1A Low Noise High Current
LED Charge Pump with
Independent Torch/Flash Current Control
DESCRIPTIO
The LTC
廬
3216 is a low noise, high current charge pump
DC/DC converter designed to power high current LEDs.
The part includes an accurate programmable current
source capable of driving loads up to 1A from a 2.9V to
4.4V input. Low external parts count (two flying capaci-
tors, two programming resistors and two bypass capaci-
tors at V
IN
and CPO) make the LTC3216 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. Independent high and
low current settings are programmed by two external
resistors. Shutdown mode and current output levels are
selected via two logic inputs.
An ultralow dropout current source maintains accurate
LED current at very low I
LED
voltages. Automatic mode
switching optimizes efficiency by monitoring the voltage
across the LED current source and switching modes only
when I
LED
dropout is detected. The LTC3216 is available in
a small 3mm
脳
4mm 12-Lead DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents including 6411531.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
High Efficiency Operation: 1x, 1.5x or 2x Boost
Modes with Automatic Mode Switching
Ultralow Dropout I
LED
Current Control
Output Current up to 1A
Low Noise Constant Frequency Operation*
Independent Low Current/High Current
Programming and Enable Pins
Wide V
IN
Range: 2.9V to 4.4V
Open/Shorted LED Protection
LED Disconnect in Shutdown
Low Shutdown Current: 2.5碌A(chǔ)
4% LED Current Programming Accuracy
Automatic Soft-Start Limits Inrush Current
No Inductors
Tiny Application Circuit (All Components <1mm
Profile)
3mm
脳
4mm 12-Lead DFN Package
APPLICATIO S
s
s
LED Torch/Camera Light Supply for Cell Phones,
PDAs and Digital Cameras
Generic Lighting and/or Flash/Strobe Applications
TYPICAL APPLICATIO
C1
2.2碌F
C2
2.2碌F
C1
+
2.9V TO 4.4V
C
IN
2.2碌F
V
IN
LTC3216
C1
鈥?/div>
C2
+
C2
鈥?/div>
CPO
Torch Mode Efficiency vs V
IN
100
90
EFFICIENCY (P
LED
/PIN) (%)
80
70
60
50
40
30
20
10
0
2.8 3.0
3.2
3.4 3.6 3.8
V
IN
(V)
4.0
4.2
4.4
P
LED
/PIN
LUMILEDS LXCL-PWF1
V
F
= 3V TYP AT 200mA
I
LED
= 200mA
C
CPO
4.7碌F
LED1
I
LED
EN1 (TORCH)
EN2 (FLASH)
EN1
EN2
I
SET1
20k
1%
I
SET2
6.65k
1%
EN1
0
1
0
1
EN2
0
0
1
1
I
LED
0 (SHUTDOWN)
200mA (TORCH)
600mA
800mA (FLASH)
3216 TA01a
LED1: LUMILEDS LXCL-PWF1 LUXEON FLASH
U
U
U
3216 TA01b
3216fa
1

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