LTC3214EDD(RevA) View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC3214EDD Datasheet PDF : 12 Pages
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LTC3214
500mA Camera
LED Charge Pump
FEATURES
■ 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 × 3mm DFN Package,
All Components <1mm High)
■ Automatic Soft-Start
■ Output Disconnect
■ Open, Shorted LED Protection
■ No Inductors
■ Internal 110mΩ LED Current Sense Resistor
■ 3mm × 3mm 10-Lead DFN Package
U
APPLICATIO S
■ LED Torch/Camera Light Supply for Cell Phones,
PDAs and Digital Cameras
■ General Lighting and/or Flash/Strobe Applications
DESCRIPTIO
The LTC®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 VIN 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 110mΩ
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.
TYPICAL APPLICATIO
C1
2.2µF
C2
2.2µF
2.9V TO 4.5V
CIN
2.2µF
DISABLE ENABLE
C1+ C1– C2+ C2–
VIN
CPO
LTC3214
ILED
EN
ISET
0.11Ω
RSET
3214 TA01a
LED: AOT2015
LED
CCPO
4.7µF
ILED
UP TO 500mA
Efficiency vs VIN
100
100mA 200mA
90
300mA
80
70
60
50mA
50
40
30
20
10 LED = AOT2015
VF = 2.9V TYP AT 100mA
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
VIN (V)
3214 TA01b
3214fa
1
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