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LX1993 Datasheet

  • LX1993

  • Microsemi Corporation [High Efficiency LED Driver]

  • MICROSEMI

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LX1993
I N T E G R A T E D
P R O D U C T S
High Efficiency LED Driver
P
RODUCTION
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
SW
IN
FB
SHDN
1
2
3
4
8
7
6
5
OUT
GND
CS
ADJ
WWW .
Microsemi
.C
OM
Supply Voltage (V
IN
) ........................................................................-0.3V to 7.0V
Feedback Input Voltage (V
FB
) ................................................-0.3V to V
IN
+ 0.3V
Shutdown Input Voltage (V
SHDN
) ...........................................-0.3V to V
IN
+ 0.3V
Adjust Input Voltage (V
ADJ
) ....................................................-0.3V to V
IN
+0.3V
Output Voltage (V
OUT
).......................................................................-0.3V to 25V
Switch Voltage (V
SW
) ........................................................-0.3V to (V
OUT
+ 1.0V)
Switch Current (I
SW
) .............................................................................500mArms
Operating Junction Temperature.................................................................. 150擄C
Storage Temperature Range...........................................................-65擄C to 150擄C
Peak Package Solder Reflow Temp. (40 second max. exposure) ... 260擄C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal
.
DU P
ACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
FRONT MARKING
THERMAL DATA
鈥?/div>
鈥?/div>
1993
C
MSC
pin 1 indicator
DU
Plastic MSOP 8-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
胃
JA
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
胃
JC
206擄C/W
39擄C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
胃
JC
).
The
胃
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
N
AME
IN
FB
D
ESCRIPTION
Unregulated IC Supply Voltage Input 鈥?Input range from +1.6V to +6.0V. Bypass with a 1碌F or greater capacitor
for low voltage operation.
Feedback Input 鈥?Connect to a current sense resistor between the load and GND to set the maximum output
current.
Active-Low Shutdown Input 鈥?A logic low shuts down the device and reduces the supply current to <1碌A(chǔ).
Connect
SHDN
to V
CC
for normal operation.
Inductor Switching Connection 鈥?Internally connected to the drain of a 28V N-channel MOSFET. SW is high
impedance in shutdown.
Current-Sense Amplifier Input 鈥?Connecting a resistor between CS and GND sets the peak inductor current limit.
Common terminal for ground reference.
Output Current Adjustment Input 鈥?Provides the internal reference for the output current feedback. The signal
input can be either a PWM signal or analog voltage allowing a dynamic output current adjustment. The signal
should typically range from 500mV to GND, but is capable of an input up to V
IN
. Caution should be used not to
exceed the device output current rating.
Output Current - Adjustable up to 25mA. Load voltage should not exceed 25V.
SHDN
SW
CS
GND
ADJ
OUT
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
漏
2000
Rev. 1.0b, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2

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