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| 型号： | LT1073CN8-12 |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST INV 12V .4A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 12V |
| 输入电压： | 1 V ~ 30 V |
| 频率 - 开关： | 19kHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°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 |
LT1073
APPLICATIO S I FOR ATIO
= ? 1 +
(
? 212 mV
V OUT
?
?
R 2 ?
R 1 ?
)
R3 programs switch current limit. This is especially im-
portant in applications where the input varies over a wide
range. Without R3, the switch stays on for a fixed time
each cycle. Under certain conditions the current in L1 can
Step-Down (Buck Mode) Operation
A step-down DC/DC converter converts a higher voltage to
a lower voltage. It is short-circuit protected because the
build up to excessive levels, exceeding the switch rating
and/or saturating the inductor. The 220 ? resistor pro-
grams the switch to turn off when the current reaches
approximately 400mA. When using the LT1073 in step-
V IN
R3
220 ?
I LIM V IN SW1
FB
down mode, output voltage should be limited to 6.2V or
less.
Inverting Configurations
C2
+
LT1073
SW2
GND
D1
1N5818
L1
C1
+
V OUT
R2
R1
The LT1073 can be configured as a positive-to-negative
converter (Figure 8), or a negative-to-positive converter
(Figure 9). In Figure 8, the arrangement is very similar to
a step-down, except that the high side of the feedback is
referred to ground. This level shifts the output negative. As
Figure 7. Step-Down Mode Hookup
1073 FO7
in the step-down mode, D1 must be a Schottky diode, and
? V OUT ? should be less than 6.2V.
switch is in series with the output. Step-down converters
are characterized by low output voltage ripple but high
input current ripple. The usual hookup for an LT1073-
based step-down converter is shown in Figure 7.
+V IN
+
C2 R3
I LIM V IN SW1
FB
When the switch turns on, SW2 pulls up to V IN – V SW . This
puts a voltage across L1 equal to V IN – V SW – V OUT ,
causing a current to build up in L1. At the end of the switch
ON time, the current in L1 is equal to
LT1073
SW2
GND
L1
R1
= IN SW OUT t ON
i PEAK
V – V – V
L
D1
1N5818
+
C1
R2
–V OUT
1073 FO8
When the switch turns off the SW2 pin falls rapidly and
Figure 8. Positive-to-Negative Converter
actually goes below ground. D1 turns on when SW2
L1
D1
reaches 0.4V below ground. D1 MUST BE A SCHOTTKY
DIODE. The voltage at SW2 must never be allowed to go
below –0.5V. A silicon diode such as the 1N4933 will allow
I LIM
V IN
+
C1
+V OUT
R1
SW2 to go to –0.8V, causing potentially destructive power
dissipation inside the LT1073. Output voltage is deter-
mined by
C2
+
AO
SW1
LT1073
FB
2N3906
= ? 1 +
(
? 212 mV
V OUT
?
?
R 2 ?
R 1 ?
)
–V IN
GND
SW2
R2
V OUT =
( R2 R1 ) 212mV + 0.6V
1073 F09
Figure 9. Negative-to-Positive Converter
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1073CN8-12#PBF | 功能描述:IC REG BUCK BST INV 12V .4A 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 |
| LT1073CN8-5 | 功能描述:IC REG BUCK BST INV 5V 0.4A 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 |
| LT1073CN85#PBF | 制造商:Linear Technology 功能描述:LT1073CN85#PBF |
| LT1073CN8-5#PBF | 功能描述:IC REG BUCK BST INV 5V 0.4A 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 |
| LT1073CN85PBF | 制造商:Linear Technology 功能描述:LT1073CN85PBF |
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