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LTC3215EDD Datasheet

  • LTC3215EDD

  • 700mA Low Noise High Current LED Charge Pump

  • 12頁(yè)

  • LINER

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LTC3215
700mA Low Noise High
Current LED Charge Pump
FEATURES
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DESCRIPTIO
High Efficiency Operation: 1x, 1.5x or 2x Boost
Modes with Automatic Mode Switching
Ultralow Dropout I
LED
Current Control
Output Current up to 700mA
Low Noise Constant Frequency Operation*
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
3mm 10-Lead DFN Package
The LTC
廬
3215 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 700mA from a 2.9V
to 4.4V input. Low external parts count (two flying capaci-
tors, one programming resistor and two bypass capaci-
tors) makes the LTC3215 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. LED current is pro-
grammed with an external resistor. The LED is discon-
nected from V
IN
during shutdown.
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 LTC3215 is available in
a low profile 3mm
脳
3mm 10-Lead DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*Protected by U.S. Patent 6411531.
APPLICATIO S
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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
) (%)
I
LED
= 200mA
C1
+
2.9V TO 4.4V
C
IN
2.2碌F
V
IN
C1
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C2
+
C2
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CPO
LED1
C
CPO
4.7碌F
80
70
60
50
40
30
20
10
LTC3215
I
LED
I
LED
200mA
DISABLE ENABLE
EN
I
SET
20k
1%
3215 TA01a
LED = AOT2015 HPW 1751B
V
F
= 3V TYP AT 200mA
2.8 3.0
3.2
3.4 3.6 3.8
V
IN
(V)
4.0
4.2
4.4
0
LED1: AOT2015 HPW 1751B
U
Efficiency vs V
IN
3215 TA01b
U
U
3215f
1

LTC3215EDD 產(chǎn)品屬性

  • LTC3215

  • 121

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動(dòng)器

  • -

  • -

  • -

  • 1

  • 是

  • 背光，閃燈/白光

  • 白色 LED

  • 600kHz ~ 1.2MHz

  • 2.9 V ~ 4.4 V

  • -

  • 表面貼裝

  • 10-WFDFN 裸露焊盤(pán)

  • 10-DFN（3x3）

  • 管件

  • -40°C ~ 85°C

LTC3215EDD相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
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