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参数资料
| 型号： | LT1948EMS8#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 3600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, MSOP-8 |
| 文件页数： | 2/4页 |
| 文件大小： | 207K |
| 代理商： | LT1948EMS8#TR |
LT1948
2
VIN Voltage ................................................................ 8V
CT Voltage.................................................................. 6V
SW1, SW2 Voltage .................................................. 36V
FB Voltage ................................................................. 3V
VON, VO2 Voltage..................................................... 30V
Operating Temperature Range (Note 2) .. – 40
°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
ORDER PART
NUMBER
MS8 PART
MARKING
TJMAX = 125°C, θJA = 200°C/W
Consult factory for Industrial and Military grade parts.
LTNR
LT1948EMS8
ABSOLUTE
AXI U
RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1948 is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
Not Switching
7
13
mA
Reference Voltage
1.26
V
Reference Line Reg
2.7V < VIN < 8V
0.01
%/V
CT Source Current
VFB1 = 1.3V
4.5
5.5
6.5
A
CT Voltage to Turn On Q3
1.25
1.28
1.30
V
FB1 Voltage to Begin CT Charge
1.17
1.20
1.23
V
SW1 Current Limit
(Note 3)
1.2
1.5
A
SW2 Current Limit
(Note 3)
0.5
0.8
A
SW1 Saturation Voltage
ISW1 = 800mA
350
410
mV
SW2 Saturation Voltage
ISW2 = 300mA
250
300
mV
Oscillator Frequency
q
2.4
3.2
3.6
MHz
Maximum Duty Cycle
70
75
90
%
0
°C ≤ TA ≤ 85°C
q
69
%
–40
°C ≤ TA ≤ 0°C
q
67
%
VO2 Pin Resistance
Measured to Ground
400
k
SW1, SW2 Error Amp Gain
100
V/V
SW1, SW2 Error Amp Gm
50
A/V
FB1 Regulation Voltage
1.240
1.260
1.280
V
q
1.230
1.285
V
FB1 Line Regulation
2.7V < VIN < 8V
0.01
0.05
VO2 Regulation Voltage
22
23
24
V
VON Switch Drop
VO2 = 25V, 7mA Load from VON, CT Voltage >1.30V
200
260
mV
SW1 Leakage Current
Switch Off, SW1 Voltage = 3.3V
0.01
5
A
SW2 Leakage Current
Switch Off, SW2 Voltage = 3.3V
0.01
2
A
1
2
3
4
FB1
CT
SW1
GND
8
7
6
5
VON
VO2
SW2
VIN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current limit guaranteed by design and/or correlation to static test.
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| LT1949-1EMS8 | 功能描述:IC REG BOOST ADJ 1A 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| LT1949-1EMS8#PBF | 功能描述:IC REG BOOST ADJ 1A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
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