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PDF LD7291 Data sheet ( Hoja de datos )

Número de pieza LD7291
Descripción WLED Driver
Fabricantes Leadtrend 
Logotipo Leadtrend Logotipo



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No Preview Available ! LD7291 Hoja de datos, Descripción, Manual

WLED Driver with 1~2 Cells Input
LD7291
5/31/2007
REV: 00a
General Description
The LD7291 is a high efficiency WLED driver to drive
maximum 3 WLEDs from single or 2 battery cells. By using
the proprietary topology, the LD7291 can operate under as
low as 0.85V to fully utilize the energy of battery.
The LD7291 only needs 4 external passive components to
provide the solution for driving maximum 3 WLEDs in a very
small PCB size. Furthermore, the 3 WLEDs can achieve
very good current matching without any extra current
/brightness control circuit. All the above functions are
integrated in a tiny SOT-26 package. The LD7291 is the
ideal solution for battery-powered LED driving applications.
Features
z Very few external components
z Low ripple and low noise
z Low start-up voltage, 0.85V at 1mA
z Direct drive maximum 3 WLEDs
z High efficiency
Applications
z WLED Flashlight
z WLED Torch
z Backlight Module of Hand-held Device
z Constant Current Source
g Patent pending
Typical Application
1~2 cell
LX Vout LED1 LED2 LED3
LD7291
GND
Leadtrend Technology Corporation
LD7291-DS-00a May 2007
1

1 page




LD7291 pdf
Package Information
SOT-26
LD7291
Symbol
A
B
C
D
F
H
I
J
M
θ
Dimension in Millimeters
Min Max
2.692
3.099
1.397
1.803
-------
1.450
0.300
0.550
0.838
1.041
0.080
0.254
0.050
0.150
2.600
3.000
0.300
0.600
0° 10°
Dimensions in Inches
Min Max
0.106
0.122
0.055
0.071
-------
0.058
0.012
0.022
0.033
0.041
0.003
0.010
0.002
0.006
0.102
0.118
0.012
0.024
0° 10°
Important Notice
Leadtrend Technology Corp. reserves the right to make changes or corrections to its products at any time without notice. Customers should
verify the datasheets are current and complete before placing order.
Leadtrend Technology Corporation
LD7291-DS-00a May 2007
5

5 Page










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