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參數(shù)資料
| 型號： | LX1741CDUT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.145 A SWITCHING CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大小： | 459K |
| 代理商： | LX1741CDUT |
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright
2000
Rev. 1.1, 2002-11-21
WWW
.Microse
m
i
.CO
M
LX1741
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
I N T E GR A T ED
PRO DUC T S
ELECTRICAL CHA RACTERISTICS
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: VIN = 3V, VOUT = 18.5V, VADJ = 0V, RLOAD = 9.25k, SHDN = VIN
LX1741
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Operating Voltage
VIN
1.6
6.0
V
Minimum Start-up Voltage
VSU
TA = +25°C
1.6
V
Start-up Voltage Temperature
Coefficient
kVST
-2
mV/
°C
VFB = 1.5V
80
100
A
Quiescent Current
IQ
VSHDN < 0.4V
0.2
0.5
A
FB Threshold Voltage
VFB
VADJ = GND
1.264
1.290
1.316
V
FB Input Bias Current
IFB
VFB = 1.4V
-200
200
nA
ADJ Input Voltage Range
1
VADJ
0
VIN –
100mV
V
ADJ Input Bias Current
IADJ
VADJ = VFB = 1.29V
0.3
1.0
A
SRC Input Current
ISRC
0.8
ARMS
Shutdown Input Bias Current
ISHDN
SHDN = GND
-50
50
nA
Shutdown High Input Voltage
VSHDN
VIN = 2V
1.6
V
Shutdown Low Input Voltage
VSHDN
VIN = 2V
0.4
V
Current Sense Bias Current
ICS
3.0
5.0
7.0
A
Minimum Peak Current
IMIN
GBNT
2
145
mA
Comparator A Delay
tD
GBNT
2
620
ns
NDRV Sink Current
ISNK
VIN = 5V
50
mA
NDRV Source Current
ISRC
VIN = 5V
100
mA
Minimum Off-Time
tOFF
VFB = 1V
100
500
ns
Notes:
1. When using a DC source to adjust VOUT, the recommended VADJ (range) is from 0.9V to 1.50V: see figure 3 and 8.
2. Guaranteed typical value (not tested) @ TA = 25
oC (see section “Inductor Selection and Current Limit Programming”)
SIMPLIFIED BLOCK DIAGRAM
Logic
Controller
Reference
Logic
ADJ
FB
Shutdown
Logic
SHDN
CS
Driver
GND
NDRV
IN
4 A
SRC
2.5M
50pF
A
B
1.29V
Reference
EE
LL
EE
CC
TT
RR
IICC
AA
LL
SS
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