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| 型号： | LT3481EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.27 V ~ 20 V |
| 输入电压： | 3.6 V ~ 34 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 2.8MHz |
| 电流 - 输出： | 2A |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3481
ELECTRICAL CHARACTERISTICS
The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 10V, V RUNS/SS = 10V V BOOST = 15V, V BIAS = 3.3V unless otherwise
noted. (Note 2)
PARAMETER
Minimum Input Voltage
Quiescent Current from V IN
Quiescent Current from BIAS
CONDITIONS
V RUN/SS = 0.2V
V BIAS = 3V, Not Switching
V BIAS = 0, Not Switching
V RUN/SS = 0.2V
V BIAS = 3V, Not Switching
●
●
●
MIN
TYP
3
0.01
22
75
0.01
50
MAX
3.6
0.5
60
120
0.5
120
UNITS
V
μA
μA
μA
μA
μA
Minimum Bias Voltage
V BIAS = 0, Not Switching
0
2.7
5
3
μA
V
Feedback Voltage
●
1.25
1.24
1.265
1.265
1.29
1.3
V
V
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
V FB = 1.25V, V C = 0.4V
4V < V IN < 34V
●
30
0.002
100
0.02
nA
%/V
Error Amp g m
Error Amp Gain
V C Source Current
V C Sink Current
V C Pin to Switch Current Gain
V C Clamp Voltage
330
800
65
85
3.5
2
μMho
μA
μA
A/V
V
Switching Frequency
R T = 8.66k
2.5
2.8
3.1
MHz
Minimum Switch Off-Time
R T = 29.4k
R T = 187k
●
1.25
250
1.4
300
130
1.55
350
200
MHz
kHz
nS
Switch Current Limit
Switch V CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
Duty Cycle = 5%
I SW = 2A
V SW = 10V, V BIAS = 0V
I SW = 1A
V RUN/SS = 2.5V
●
3.2
3.8
360
0.02
1.5
18
5
4.4
2
2.1
35
10
A
mV
μA
V
mA
μA
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
2.5
0.2
V
V
PG Threshold Offset from Feedback Voltage
PG Hysteresis
V FB Rising
122
5
mV
mV
PG Leakage
V PG = 5V
0.1
1
μA
PG Sink Current
V PG = 3V
●
100
600
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 LT3481E is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3481I speci?cations are
guaranteed over the –40°C to 125°C temperature range. The LT3481H
speci?cations are guaranteed over the –40°C to 150°C operating
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: Bias current ?ows into the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed
to guarantee full saturation of the switch.
3481fc
3
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