鈻?/div>
DESCRIPTIO
Low Noise Constant Frequency Operation*
High Efficiency: Up to 94%
Multi-Mode Operation: 1x, 1.5x or 2x Boost Modes
Automatic Mode Switching
High Output Current: Up to 500mA
Tiny Application Circuit (3mm
脳
3mm DFN Package,
All Components <1mm High)
Automatic Soft-Start
Output Disconnect
Open, Shorted LED Protection
No Inductors
Internal 110m鈩?LED Current Sense Resistor
3mm
脳
3mm 10-Lead DFN Package
The LTC
廬
3214 is a low noise, high current charge pump
DC/DC converter capable of driving high current LEDs at
up to 500mA from a 2.9V to 4.5V input. Low external
parts count (two flying capacitors, one programming
resistor and two bypass capacitors at V
IN
and CPO) make
the LTC3214 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.
Output current level is programmed by an external resis-
tor. LED current is regulated using an internal 110m鈩?/div>
sense resistor. Automatic mode switching optimizes effi-
ciency by monitoring the voltage across the charge pump
and switching modes only when dropout is detected. The
part is available in a low profile 3mm x 3mm 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.
APPLICATIO S
鈻?/div>
鈻?/div>
LED Torch/Camera Light Supply for Cell Phones,
PDAs and Digital Cameras
General Lighting and/or Flash/Strobe Applications
TYPICAL APPLICATIO
C1
2.2碌F
C2
2.2碌F
100
90
EFFICIENCY (P
LED
/P
IN
) (%)
100mA 200mA
300mA
C1
+
2.9V TO 4.5V
C
IN
2.2碌F
V
IN
C1
鈥?/div>
C2
+
C2
鈥?/div>
CPO
LED
C
CPO
4.7碌F
80
70
60
50
40
30
20
10
LED = AOT2015
V
F
= 2.9V TYP AT 100mA
2.9 3.1
3.3
3.5 3.7 3.9
V
IN
(V)
4.1
4.3
4.5
50mA
LTC3214
I
LED
I
LED
UP TO 500mA
DISABLE ENABLE
EN
I
SET
0.11鈩?/div>
R
SET
3214 TA01a
0
LED: AOT2015
U
Efficiency vs V
IN
3214 TA01b
U
U
3214fa
1
LTC3214EDD 產(chǎn)品屬性
LTC3214
121
集成電路 (IC)
PMIC - LED 驅(qū)動器
-
-
-
1
是
背光，閃燈/白光
白色 LED
600kHz ~ 1.2MHz
2.9 V ~ 4.5 V
-
表面貼裝
10-WFDFN 裸露焊盤
10-DFN（3x3）
管件
-40°C ~ 85°C
LTC3214EDD相關(guān)型號PDF文件下載
-
型號
版本
描述
廠商
下載
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