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MX841 Fiches technique(PDF) 1 Page - IXYS Corporation

No de pièce MX841
Description  White LED Step-Up Converter
Download  6 Pages
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Fabricant  IXYS [IXYS Corporation]
Site Internet  http://www.ixys.com
Logo IXYS - IXYS Corporation

MX841 Fiches technique(HTML) 1 Page - IXYS Corporation

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Preliminary
IXYS
MX841
1
03/10/05
Drawing No. 17023
www.ixys.net
MX841
White LED Step-Up Converter
Features:
• 1.1V to 5.5V Input Range
• 2 Amp Peak Switch Current
• High Efficiency > 80%
• 20V Maximum Output with Over-Voltage
Protection
• LED Intensity Control
• 1.0 MHz Fixed Frequency Switching
• 8 Lead SOIC Package
Applications:
• White LED Display Backlighting
-
Low Voltage: Mobile Phones, PDA’s,
MP3 Players, Digital Cameras
-
High Drive Current: Vehicle
Instrumentation Panels
Ordering Information
Part No.
Description
Qty
17000-00TU SOIC-8 Standard Tube
100
17000-00TR SOIC-8 Standard T&R
2500
17043-00TU SOIC-8 Exposed Pad Tube 100
17043-00TR SOIC-8 Exposed Pad T&R
2500
General Description
The MX841 is a fixed frequency, constant current
source step-up DC/DC converter. The output current
is directly regulated making the MX841 ideal for
driving series connected white light emitting diodes
(LED’s) in backlight applications. The MX841
powers up to 3 series white LED’s at 1.1V, and 20
series/parallel white LED’s at 5.0V.
The MX841 features a 1.0MHz switching frequency
to accommodate the use of small capacitors and a
small inductor necessary in size sensitive portable
applications. Light intensity and shutdown are
conveniently controlled by a single analog voltage.
Power efficiency and battery life are extended
through the use of a high voltage, low RDSON N-
channel MOSFET switch.
The MX841 is designed to operate over a
temperature range of -40°C to +85°C, and is
available in an SOIC-8 Package, with or without an
Exposed Pad in Tube or on Tape and Reel.
(Alternate package types available upon request).
Functional Block Diagram
Typical Application
MX841
CTRL
Vbattery
OVD
Isense
CTL/
SLEEP
Rsense
Vboost
Analog
GND
Switch
GND
3
14
5
6
8
7
2
osc
err amp/
comparato
r
sleep de
t
bias gen
VDD
drive
r
Isense
OVD
band gap
+
compar
e
Gnd
Switch
SW
SW
CTL/SLEEP
Analog
Gnd


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