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参数资料
| 型号： | LT3579EFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/40页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG SYNC 20TSSOP |
| 标准包装： | 74 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 6A |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-TSSOP-EP |
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LT3579/LT3579-1
APPLICATIONS INFORMATION
L1
100k
V C
C IN
C C
C SS
HOTPLUG
The high inrush current associated with hot-plugging V IN
can be largely rejected with the use of an external PMOS. A
simple hot-plug controller can be designed by connecting
an external PMOS in series with V IN , with the gate of the
PMOS being driven by the GATE pin of the LT3579. Since
the GATE pin pull-down current is linearly proportional to
the SS voltage, and the SS charge up time is relatively slow,
the GATE pin pull-down current will increase gradually,
thereby turning on the external PMOS slowly. Controlled
in this manner, the PMOS acts as an input current limiter
when V IN hot-plugs or ramps up sharply.
V IN
D1 C1 D3
D2
R FB
SW1 SW2
V IN FB
SHDN GATE
LT3579
FAULT CLKOUT
RT
SYNC GND SS R C
C F
R T
35791 F15
Figure 15. Single Inductor Inverting Topology
–V OUT
C OUT
Likewise, when the PMOS is connected in series with the
output, inrush currents into the output capacitor can be
limited during a hot-plug event. To illustrate this, the circuit
in Figure 6 was re-configured by adding a large 1500μF
capacitor to the output. An 18Ω resistive load was used
and a 2.2μF capacitor was placed on SS. Figure 14 shows
the result of hot-plugging this re-configured circuit. The
inductor current is well behaved and V OUT comes up once
V IN settles out.
V IN
12V
10μH
4.7μF
4.7μF
6.8μF
4.7μF
4.7μF
V OUT2
100V
200mA
V OUT1
67V
100mA
V IN
5V/DIV
V OUT
10V/DIV
I L
5A/DIV
10μF
100k
536k
SW1 SW2
V IN FB
FAULT GATE
LT3579
SHDN CLKOUT
RT V C
383k
6.5k
V IN
6.8μF
SS
1V/DIV
86.6k
SYNC
GND
SS
2.2μF
27pF
34k
470pF
1s/DIV
35791 F14
35791 F16
Figure 14. V IN Hot-Plug Control. Inrush Current is Well Controlled
Figure 16. High V OUT Charge Pump Topology
35791f
23
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3579EFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EUFD#PBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN 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 |
| LT3579EUFD#TRPBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN 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 |
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