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LX1994 Datasheet, PDF (1/13 Pages) Microsemi Corporation – High Efficiency LED Driver | |||
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LX1994
TM
®
High Efficiency LED Driver
PRODUCTION DATA SHEET
DESCRIPTION
Microsemiâs LX1994 is a compact, The use of external N-channel
high efficiency, step-up boost MOSFET allows design to optimize
controller which is designed to drive a system efficiency.
string of white or colored LEDâs in a The OVP protection comparator
backlight or front light system. The eliminates the need of an external Zener
LX1994 design is based on a dual diode clamp. The OVP function can be
mode PFM architecture and provides scaled for any output voltage.
maximum typical efficiency greater Maximum output current is achievable
than 92%.
by selection of the current sense
The LX1994 has many unique resistor. These features make the
design features and advantages over controller ideal for PDA or digital
competitor solutions. The features camera applications
included: low quiescent current To enhance system battery life, the
(100µA typical), low shut down LX1994 provides 2 dimming options
current (<1µA), dedicate ambient light and a dedicated ambient light sensor
sensor interface (LX1970), dual (LX1970) interface.
dimming modes, low voltage and low The LX1994 supports a wide range
offset current sense, and integrated of system battery voltage inputs which
OVP protection.
ranges from 2.0 to 5.5V. The LX1994
The converter achieves high is guaranteed to start up at 2.0V input.
efficiency, low cost, and flexible The LX1994 is available in miniature
design by selection of an external N- 10-pin MLP or MSOP packages.
Channel MOSFET, current sense
resistors, and integrated OVP
protection.
IMPORTANT: For the most current data, consult MICROSEMIâs website: http://www.microsemi.com
Auto Adjust for
Ambient Light
3V
VDD
SNK
VSS
SRC
LX1970
PRODUCT HIGHLIGHT
VIN = 2.0V to 5.5V
33µH
LX1994
VIN
DRV
S/P
SRC
BRT
OVP
LS
FB
GND
CMP
KEY FEATURES
 Efficiency > 92%
 Dual PFM Architecture To
Extend Battery Life
 VIN Range 2.0V To 5.5V. Start
Up Warranty @ 2.0V
 Logic Control Shutdown
 100µA Typical Quiescent
Current
 Shutdown IQ Current <1µA
 OVP For Open String Output
Voltage
 Low Voltage And Offset
Current Sense
 Light Sensor (LX1970)
interface
 Dual Dimming Options (PWM
or DC Voltage)
 No External Zener Clamp
Diode
 10-Pin MLP or MSOP
APPLICATIONS
 Pagers
 PDA
 Cell Phone
 Portable Display
 Digital Cameras
UPS5819
FDV303
Copyright © 2003
Rev. 1.0a, 2004-08-10
TA (°C)
-40 to 85
PACKAGE ORDER INFO
Plastic MLP
Plastic MSOP
LD 10-Pin
DU 10-Pin
LX1994CLD
LX1994CDU
Note: Available in Tape & Reel. Append the letters âTRâ to the part number. (i.e.
LX1994CDU-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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