參數(shù)資料
型號： LX1742
廠商： Microsemi Corporation
英文描述： High Efficiency High Voltage Boost Controller
中文描述： 高效率高電壓升壓控制器
文件頁數(shù)： 3/13頁
文件大小： 456K
代理商： LX1742
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright
2000
Rev. 1.0b, 2005-03-03
W
M
.
C
LX1742
High Efficiency High Voltage Boost Controller
P
RODUCTION
D
ATA
S
HEET
I N T E G R A T E D P R O D U C T S
E L E C T R I C A L C H A R A C T E R I S T I C S
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0
°
C
≤
T
A
≤
70
°
C except where otherwise noted and
the following test conditions: V
IN
= 3.0V, V
ADJ
= 0V,
SHDN
= V
IN
, V
FB
= 1.0V, Pin 8 = (not connected), Pin 1 = (+5V through 39.2
).
LX1742
Typ
Parameter
Symbol
Test Conditions
Min
Max
Units
`
Operating Voltage
Minimum Start-up Voltage
Start-up Voltage Temperature
Coefficient
V
IN
V
SU
T
A
= +25
°
C
1.6
6.0
1.6
V
V
k
VST
Guaranteed: not tested
-2
mV/
°
C
μ
A
μ
A
V
nA
Not Switching
V
SHDN
< 0.4V
V
ADJ
= GND
Switching mode
80
0.5
1.200
100
1.0
1.225
200
V
IN
–
100mV
200
50
0.4
6.0
Quiescent Current
I
Q
FB Threshold Voltage
FB Input Bias Current
V
FB
I
FB
V
ADJ
I
ADJ
I
SHDN
V
SHDN
V
SHDN
I
CS
R
DS(ON)
I
LEAK
t
OFF
V
F
I
R
1.175
0
ADJ Input Voltage Range
1
0
V
ADJ Input Bias Current
Shutdown Input Bias Current
Shutdown High Input Voltage
Shutdown Low Input Voltage
Current Sense Bias Current
Internal NFET On-resistance
Switch Pin Leakage Current
Switch Off-Time
Diode Forward Voltage
Diode Reverse Current
V
ADJ
= V
FB
= 1.20V
SHDN
= GND
V
IN
= 2V
V
IN
= 2V
T
A
= +25
°
C; I
SW
= 10mA; V
FB
= 1V
V
SW
= 25V
V
FB
= 1V
T
A
= +25
°
C; I
F
= 150mA
T
A
= +25
°
C; V
R
= 25V
0
nA
nA
V
V
μ
A
μ
A
ns
V
μ
A
-50
1.6
2.0
4.0
1.1
0.23
300
1.0
1.5
Notes:
1.
2.
When using a DC source to adjust VOUT, the recommended VADJ (range) is 0.9V to 1.50V: see figure 9.
Guaranteed typical value (not tested) @ TA=25°C (see section “Inductor Selection & Current Limit Programming”).
S I M P L I F I E D B L O C K D I A G R A M
Off-time
Controller
A
Reference
Logic
ADJ
1.2V
Reference
FB
B
Current
Limiter
Shutdown
Logic
SHDN
CS
Driver
GND
SW
IN
4
μ
A
OUT
E
L
E
C
T
R
I
C
A
L
S
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