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参数资料
| 型号： | LX1742CDU-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 7/13页 |
| 文件大小： | 456K |
| 代理商： | LX1742CDU-TR |
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
WWW
.Microse
m
i
.CO
M
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
ELECTRI CAL CHA RACTERI S TI CS
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 = 3.0V, VADJ = 0V,
SHDN = VIN, VFB = 1.0V, Pin 8 = (not connected), Pin 1 = (+5V through 39.2).
LX1742
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
Guaranteed: not tested
-2
mV/°C
Not Switching
80
100
A
Quiescent Current
IQ
VSHDN < 0.4V
0.5
1.0
A
FB Threshold Voltage
VFB
VADJ = GND
1.175
1.200
1.225
V
FB Input Bias Current
IFB
Switching mode
0
200
nA
ADJ Input Voltage Range
1
VADJ
0
VIN –
100mV
V
ADJ Input Bias Current
IADJ
VADJ = VFB = 1.20V
0
200
nA
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
2.0
4.0
6.0
A
Internal NFET On-resistance
RDS(ON)
TA = +25°C; ISW = 10mA; VFB = 1V
1.1
Switch Pin Leakage Current
ILEAK
VSW = 25V
0.23
A
Switch Off-Time
tOFF
VFB = 1V
300
ns
Diode Forward Voltage
VF
TA = +25°C; IF = 150mA
1.0
V
Diode Reverse Current
IR
TA = +25°C; VR = 25V
1.5
A
Notes:
1.
When using a DC source to adjust VOUT, the recommended VADJ (range) is 0.9V to 1.50V: see figure 9.
2.
Guaranteed typical value (not tested) @ TA=25°C (see section “Inductor Selection & Current Limit Programming”).
SI MPLIFI ED BLOCK DI AGRAM
Off-time
Controller
A
Reference
Logic
ADJ
1.2V
Reference
FB
B
Current
Limiter
Shutdown
Logic
SHDN
CS
Driver
GND
SW
IN
4 A
OUT
EE
LL
EE
CC
TT
RR
IICC
AA
LL
SS
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