参数资料
型号: LT1376CN8#PBF
厂商: Linear Technology
文件页数: 6/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8DIP
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: 2.42 V ~ 21.5 V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°C ~ 125°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
供应商设备封装: 8-PDIP
LT1375/LT1376
TYPICAL PERFOR M A N CE CHARACTERISTICS
1.50
Maximum Load Current
at V OUT = 10V
1.50
Maximum Load Current
at V OUT = 3.3V
1.50
Maximum Load Current
at V OUT = 5V
1.25
1.00
0.75
V OUT = 10V
L = 20 μ H
L = 10 μ H
L = 5 μ H
1.25
1.00
0.75
L = 20 μ H
L = 10 μ H
L = 5 μ H
1.25
1.00
0.75
L = 20 μ H
L = 10 μ H
L = 5 μ H
0.50
0.25
0.50
0.25
V OUT = 3.3V
0.50
0.25
V OUT = 5V
0
0
5
10 15
20
25
0
0
5
10 15
20
25
0
0
5
10 15
20
25
12
10
INPUT VOLTAGE (V)
BOOST Pin Current
T J = 25 ° C
1375/76 G13
1.4
1.2
INPUT VOLTAGE (V)
V C Pin Shutdown Threshold
SHUTDOWN
1375/76 G14
0.8
INPUT VOLTAGE (V)
Switch Voltage Drop
T J = 25 ° C
1375/76 G15
0.6
8
1.0
6
4
0.8
0.4
2
0.6
0.2
0
0
0.25
0.50 0.75 1.00
1.25
0.4
–50
–25
0
25
50
75
100
125
0
0
0.25
0.50 0.75 1.00
1.25
1.50
SWITCH CURRENT (A)
PI N FU N CTIO N S
1375/76 G16
JUNCTION TEMPERATURE ( ° C)
1375/76 G11
SWITCH CURRENT (A)
1375/76 G18
BOOST: The BOOST pin is used to provide a drive voltage,
higher than the input voltage, to the internal bipolar NPN
power switch. Without this added voltage, the typical
switch voltage loss would be about 1.5V. The additional
boost voltage allows the switch to saturate and voltage
loss approximates that of a 0.3 ? FET structure, but with
much smaller die area. Efficiency improves from 75% for
conventional bipolar designs to > 87% for these new parts.
V SW : The switch pin is the emitter of the on-chip power
NPN switch. It is driven up to the input pin voltage during
switch on time. Inductor current drives the switch pin
with the external catch diode. Maximum negative switch
voltage allowed is – 0.8V.
SHDN: The shutdown pin is used to turn off the regulator
and to reduce input drain current to a few microamperes.
Actually, this pin has two separate thresholds, one at
2.38V to disable switching, and a second at 0.4V to force
complete micropower shutdown. The 2.38V threshold
functions as an accurate undervoltage lockout (UVLO).
This is sometimes used to prevent the regulator from
operating until the input voltage has reached a predeter-
mined level.
negative during switch off time. Negative voltage is clamped
13756fd
6
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