LX1992
High Efficiency LED Driver
L I N F I N I T Y D I V I S I O N
PRODUCTION
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 70°C except where
otherwise noted and the following test conditions: VIN = 3V, ILOAD = 20mA, = V and VADJ = 300mV.
SHDN
Test Conditions
IN
,
LX1992
Typ
Parameter
Symbol
Units
Min
Max
`
Operating Voltage
VIN
1.6
6.0
1.6
V
V
Minimum Start-up Voltage
VSU
TA = +25°C
Start-up Voltage Temperature
Coefficient
kVST
-2
mV/°C
VFB > 0.3V
VSHDN < 0.4V
50
0.2
300
100
0.5
325
100
VIN
0
µA
µA
mV
nA
V
Quiescent Current
IQ
FB Threshold Voltage
FB Input Bias Current
ADJ Input Voltage Range
ADJ Input Bias Current
VFB
IFB
275
-100
0.0
VFB = 0.3V
VADJ
IADJ
IOUT = (VADJ)/(RSET
VADJ < 0.3V
)
-150
-50
nA
nA
V
V
Shutdown Input Bias Current
ISHDN
50
= GND
SHDN
Shutdown High Input Voltage
Shutdown Low Input Voltage
Current Sense Bias Current
Minimum Peak Current
Efficiency
NDRV Sink Current
NDRV Source Current
Off-Time
VSHDN
VSHDN
1.6
0.4
7.0
83
ICS
IMIN
η
ISNK
ISRC
tOFF
VFB < 0.3V
CS = 560Ω
3.0
53
5.0
µA
mA
%
R
VIN = 3.0V, ILOAD = 20mA
VIN = 5V
85
50
mA
mA
ns
VIN = 5V
100
VFB = 0.3V; VADJ=0.5V
100
500
SIMPLIFIED BLOCK DIAGRAM
FB
A
DRV
SRC
GND
Reference
Logic
Control
Logic
Driver
ADJ
50pF
2.5MΩ
5µA
B
CS
Shutdown
Logic
IN
SHDN
Copyright 2000
Microsemi
Page 3
Rev. 1.1, 2002-11-21
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
ETC [ ETC ]
