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| 型号： | LT1376CN8 |
| 厂商： | Linear Technology |
| 文件页数： | 9/28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： | 无 |
| 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 |
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LT1375/LT1376
APPLICATIO N S I N FOR M ATIO N
LT1375/LT1376
TO FREQUENCY
SHIFTING
1.6V
ERROR
Q1
V SW
OUTPUT
5V
AMPLIFIER
R5
+
–
2.4V
R3
1k
R4
1k
FB
R1
+
5k
V C
Q2
GND
Figure 2. Frequency and Current Limit Foldback
R2
5k
1375/76 F02
Please read the following if divider resistors are increased
above the suggested values.
equal to the short-circuit current limit of the switch (typi-
cally 2A for the LT1376, folding back to less than 1A).
R 1 =
Table 1
R 2 ( V OUT ? 2 . 42 )
2 . 42
Minimum switch on time limitations would prevent the
switcher from attaining a sufficiently low duty cycle if
switching frequency were maintained at 500kHz, so fre-
quency is reduced by about 5:1 when the feedback pin
voltage drops below 1V (see Frequency Foldback graph).
OUTPUT
R1
% ERROR AT OUTPUT
This does not affect operation with normal load condi-
VOLTAGE
(V)
3
3.3
5
6
8
10
12
15
R2
(k ? )
4.99
4.99
4.99
4.99
4.99
4.99
4.99
4.99
(NEAREST 1%)
(k ? )
1.21
1.82
5.36
7.32
11.5
15.8
19.6
26.1
DUE TO DISCREET 1%
RESISTOR STEPS
+ 0.23
+ 0.08
+ 0.39
– 0.5
– 0.04
+ 0.83
– 0.62
+ 0.52
tions; one simply sees a gear shift in switching frequency
during start-up as the output voltage rises.
In addition to lower switching frequency, the LT1376 also
operates at lower switch current limit when the feedback
pin voltage drops below 1.7V. Q2 in Figure 2 performs this
function by clamping the V C pin to a voltage less than its
normal 2.3V upper clamp level. This foldback current limit
greatly reduces power dissipation in the IC, diode and
inductor during short-circuit conditions. Again, it is nearly
transparent to the user under normal load conditions. The
More Than Just Voltage Feedback
The feedback (FB) pin is used for more than just output
voltage sensing. It also reduces switching frequency and
current limit when output voltage is very low (see the
Frequency Foldback graph in Typical Performance Char-
acteristics). This is done to control power dissipation in
both the IC and in the external diode and inductor during
short-circuit conditions. A shorted output requires the
switching regulator to operate at very low duty cycles, and
the average current through the diode and inductor is
only loads which may be affected are current source loads
which maintain full load current with output voltage less
than 50% of final value. In these rare situations the
Feedback pin can be clamped above 1.5V with an external
diode to defeat foldback current limit. Caution: clamping
the feedback pin means that frequency shifting will also be
defeated, so a combination of high input voltage and dead
shorted output may cause the LT1376 to lose control of
current limit.
The internal circuitry which forces reduced switching
frequency also causes current to flow out of the feedback
13756fd
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1376CN8#PBF | 功能描述:IC REG BUCK ADJ 1.5A 8DIP 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°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:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1376CN8-5 | 功能描述:IC REG BUCK 5V 1.5A 8DIP 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°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:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1376CN8-5#PBF | 功能描述:IC REG BUCK 5V 1.5A 8DIP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT1376CN8-5PBF | 制造商:Linear Technology 功能描述:LT1376CN8-5PBF |
| LT1376CN8PBF | 制造商:Linear Technology 功能描述:LT1376CN8PBF |
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