LX1995_05 Datasheet, PDF (1/9 Pages) Microsemi Corporation – Miniature LED Driver

LX1995
TM
®
Miniature LED Driver
PRODUCTION DATA SHEET
DESCRIPTION
The Microsemi LX1995-x is a The LX1995-x output current is
miniature LED driver with integrated programmable using an external current
drivers. It is designed to drive white sense resistor in series with LEDs. This
or color LEDs in portable display configuration provides a feedback to the
applications. The LX1995-x is an FB pin which maintains constant output
adjustable step-up boost converter. current independent of input voltage
The LX1995-x can switch up to 2MHz and LED forward voltage (VF). LED
allowing designers to use a low cost, dimming is accomplished using a PWM
small inductor and filter capacitor. signal or varying DC voltage methods.
The driver supports a wide input The LX1995-x is available in the 5-
voltage range (1.6V to 5.5V) with Pin TSOT and SOT-23 package. The
efficiency greater than 85% and can LX1995-1 can drive up to 6 LEDs
start up at 1.6V input. The LX1995-x (switching current is 325mA). The
is a low cost, high efficiency LED LX1995-2 can drive up to 10 LEDs
driver. The design is based on a (switching current is 500mA).
pseudo-hysteretic pulse frequency
modulation topology. In portable
battery applications the LX1995-x
offers high system efficiency with low
quiescent current: in operation I_Q is <
70µA and in standby I_Q is < 1µA.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
V_BAT = 2.0V to 5.0V
KEY FEATURES
ƒ < 1µA Shutdown Current
ƒ > 85% Maximum Efficiency
ƒ Efficient at Low Current Levels
ƒ < 70µA Quiescent Supply
Current in Operating Mode
ƒ V_IN Range 1.6V to 5.5V
ƒ Logic Controlled Shutdown
ƒ Dimming Options: PWM or
Varying DC Voltage
ƒ Tiny 5-Pin TSOT Package
ƒ Smallest External Components
APPLICATIONS
ƒ Pagers
ƒ Wireless Phones
ƒ PDAs
ƒ LED Driver
ƒ Digital Camera Displays
ƒ GPS Receivers
ON OFF
IN
SW
LX1995
SHDN
FB
GND
T_A (°C)
-40 to 85
-40 to 85
Copyright © 2000
Rev. 1.1, 2005-07-07
Switch
Current
325mA
500mA
SG
PACKAGE ORDER INFO
Plastic TSOT
5-Pin
Plastic SOT-23
SE _5-Pin
RoHS Compliant / Pb-free
RoHS Compliant / Pb-free Transition DC: 0503
LX1995-1CSG
LX1995-1CSE
LX1995-2CSG
LX1995-2CSE
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1995-1CSG-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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