MX878RTR IXYS, MX878RTR Datasheet - Page 55

• Manufacturer Part Number: MX878RTR
• Description: IC DVR RELAY/LOAD 8CH 60V 28-QFN
• Manufacturer: IXYS

Specifications of MX878RTR

• Input Type: Parallel/Serial
• Number Of Outputs: 8
• Current - Output / Channel: 200mA
• Voltage - Supply: 6 V ~ 60 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• On-state Resistance: -
• Current - Peak Output: -

MX841
White LED Step-Up Converter
with Linear Dimming Control
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
• RoHS Compliant Product
Applications
• White LED Display Backlighting
Ordering Information
Functional Block Diagram
Part No.
MX841BE
MX841BETR
- Low Voltage: Mobile Phones, PDA’s,
- High Drive Current:
MP3 Players, Digital Cameras
Vehicle Instrumentation Panels
CTL/SLEEP
Analog
Gnd
Switch
Gnd
VDD
comparator
sleep det
err amp/
osc
Description
SOIC-8 Exposed Pad Tube
SOIC-8 Exposed Pad T&R
bias gen
band gap
compare
driver
+
SW
Isense
OVD
SW
Qty
100
1,000
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 R
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).
Typical Application
Vbattery
CTRL
7
CTL/
SLEEP
5
Analog
GND
2
MX841
1
Switch
GND
4
3
Isense
OVD
6
8
Vboost
Rsense
DSON
N-
33