参数资料
型号: LT3581EMSE#PBF
厂商: Linear Technology
文件页数: 3/36页
文件大小: 0K
描述: IC REG MULTI CONFIG ADJ 16MSOP
标准包装: 37
类型: 升压(升压),反相,回扫,Sepic
输出类型: 可调式
输出数: 1
输出电压: 1.22 V ~ 42 V
输入电压: 2.5 V ~ 22 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 2.5MHz
电流 - 输出: 3.3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TFSOP(0.118",3.00mm 宽)裸露焊盘
包装: 管件
供应商设备封装: 16-MSOP,裸露焊盘
LT3581
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 5V, V SHDN = V IN , V FAULT = V IN , unless otherwise noted. (Note 2).
PARAMETER
Minimum Input Voltage
V IN Overvoltage Lockout
CONDITIONS
l
MIN
22.1
TYP
2.3
23.5
MAX
2.5
25
UNITS
V
V
Positive Feedback Voltage
Negative Feedback Voltage
l
l
1.195
3
1.215
9
1.230
16
V
mV
Positive FB Pin Bias Current
Negative FB Pin Bias Current
V FB = Positive Feedback Voltage, Current into Pin
V FB = Negative Feedback Voltage, Current out of Pin
l
l
81
81
83.3
83.3
85
85.5
μA
μA
Error Amp Transconductance
Error Amp Voltage Gain
ΔI = 10μA
270
70
μmhos
V/V
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Not Switching
V SHDN = 0V
2.5V ≤ V IN ≤ 20V
1.9
0
0.01
2.3
1
0.05
mA
μA
%/V
Switching Frequency, f OSC
R T = 34k
R T = 432k
l
l
2.25
180
2.5
200
2.75
220
MHz
kHz
Switching Frequency in Foldback
Compared to Normal f OSC
1/6
ratio
Switching Frequency Range
Free-Running or Synchronizing
l
200
2500
kHz
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
l
l
1.3
0.4
V
V
SYNC Clock Pulse Duty Cycle
V SYNC = 0V to 2V
20
80
%
Recommended Minimum SYNC Ratio
f SYNC /f OSC
3/4
Minimum Off-Time
Minimum On-Time
45
55
ns
ns
SW1 Current Limit
At All Duty Cycles
l
1.9
2.4
3
A
Current Sharing (SW2/SW1)
78
%
SW1 + SW2 Current Limit
At All Duty Cycles, SW2/SW1 = 78% (Note 3)
l
3.3
4.3
5.4
A
Switch V CESAT
SW1 & SW2 Tied Together, I SW1 + I SW2 = 2.75A
250
mV
SW1 Leakage Current
SW2 Leakage Current
V SW1 = 5V
V SW2 = 5V
0.01
0.01
1
1
μA
μA
3581fa
For more information www.linear.com/LT3581
3
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