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参数资料
| 型号： | LTC3700EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 215K |
| 描述： | IC REG DL BUCK/LINEAR 10MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 50 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 550kHz |
| 电压/电流 - 输出 1： | 可调至0.8V，5A |
| 电压/电流 - 输出 2： | 可调至0.8V，150mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.4 V ~ 9.8 V |
| 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） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
14
LTC3700
3700f
Figure 4. Setting Output Voltage (Buck Controller)
9
V
FB
V
OUT1
LTC3700
R1
3700 F04
R2
Figure 5. Foldback Current Limiting
V
FB
I
TH
/RUN
V
OUT1
LTC3700
R1
3700 F05
R2
9
10
D
FB1
D
FB2
+
Setting Output Voltage (Buck Controller)
The buck develops a 0.8V reference voltage between the
feedback (Pin 9) terminal and ground (see Figure 4). By
selecting resistor R1, a constant current is caused to flow
through R1 and R2 to set the overall output voltage. The
regulated output voltage is determined by:
V
R
R
OUT1
08 1
2
1
= +
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
.
For most applications, an 80k resistor is suggested for R1.
To prevent stray pickup, locate resistors R1 and R2 close
to LTC3700.
Foldback Current Limiting
As described in the Output Diode Selection, the worst-
case dissipation occurs with a short-circuited output
when the diode conducts the current limit value almost
continuously. To prevent excessive heating in the diode,
3
V
OUT2
R3
3700 F06
R4
V
FB2
2
LDO
LTC3700
Figure 6. Setting Output Voltage (LDO Regulator)
APPLICATIONS INFORMATION
U
U
U
foldback current limiting can be added to reduce the
current in proportion to the severity of the fault.
Foldback current limiting is implemented by adding di-
odes D
FB1
and D
FB2
between the output and the I
TH
/RUN
pin as shown in Figure 5. In a hard short (V
OUT
= 0V), the
current will be reduced to approximately 50% of the
maximum output current.
Setting Output Voltage (LDO Regulator)
The LDO develops a 0.8V reference voltage between V
FB2
(Pin 3) and ground (see Figure 6), similar to the buck
controller. The regulated output voltage V
OUT2
is given by:
V
R
R
OUT2
08 1
4
3
= +
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
.
For most applications, an 80k resistor is suggested for R3.
To prevent stray pickup, locate resistors R3 and R4 close
to LTC3700.
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| LTC3701EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3701EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3701EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3701EGNPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Dn 10V SSOP16 |
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