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参数资料
| 型号： | LT1941EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/24页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG TRPL 28TSSOP |
| 标准包装： | 2,000 |
| 类型： | 降压（降压），升压（升压），反相，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 1.25 V ~ 40 V |
| 输入电压： | 3.5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
LT1941
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating temperature
range, otherwise speci?cations are at T A = 25°C. V IN , V BIAS1 , V BIAS2 = 5V, V BOOST1 , V BOOST2 = 8V, unless otherwise noted. (Note 2)
PARAMETER
Switch 2 Leakage Current
Minimum Boost Voltage Above Switch (Note 4)
Maximum Duty Cycle
CONDITIONS
l
MIN
78
TYP
0.01
1.8
88
MAX
10
2.5
UNITS
μA
V
%
1.5A Inverting/Boost
FB3 Voltage
FB3 Pin Bias Current
NFB Voltage
NFB Pin Bias Current
NFB3 Voltage (V FB3 -V NFB )
l
l
l
l
l
1.23
1.22
–15
1.212
1.205
1.25
800
0
60
1.24
1.27
1.27
1400
15
500
1.258
1.260
V
V
nA
mV
nA
V
V
FB3 Pin Output Current
PGOOD3 Threshold Offset
V FB3 = 1.35V, V NFB = –0.1V
V FB Rising
l
150
350
120
μA
mV
Error Ampli?er Transconductance
Error Ampli?er Voltage Gain
V C Switching Threshold
V C3 to Switch Current Gain
Frequency Shift Threshold on FB3
800
150
1.1
5
0.65
μMhos
V/V
V
A/V
V
Switch 3 Current Limit (Note 5)
Switch 3 V CESAT
BIAS2 Pin Current
Switch 3 Leakage Current
Maximum Duty Cycle
I SW = 1A
I SW = 1A
l
l
1.5
77
2
240
30
0.01
86
2.9
320
45
10
A
mV
mA
μA
%
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT1941E is guaranteed to meet performance speci?cations
from 0°C to 70°C. Speci?cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5: Current limit is guaranteed by design and/or correlation to static
test.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 7: Guaranteed by design, not 100% tested.
1941fb
4
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