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| 型号： | LT3579EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/40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
R FB = ? OUT
? V – 1.215V ?
2 ? 83.3μA ? ?
?
Use the following equations to calculate the FB resistor
for 2-phase converters:
; Boost or SEPIC
Multiphase Converter
10μF
4.7μF
4.7μH
V IN CLKOUT
SW1 SW2
FAULT FB
LT3579-1
SLAVE
SHDN GATE
4.7μF
× 2
R FB = ? OUT
? |V | + 9mV ?
? 2 ? 83.3μA ? ? Converter
V OUT
V OUT1
V PWR
× 2
4.7μF
V IN
5V V IN CLKOUT
V PWR
500k
21.5k
0.22μF
2.2nF
; InvertingMultiphase
Note that the CLKOUT pin on the LT3579-1 runs at a fixed
duty cycle of ~50%. If monitoring the die temperature is
desired, the slave IC can be a LT3579.
It is possible to use the LT3579-1 in a multiphase converter
of more than 2 phases. Consult the LTC Applications
Engineering Department for more information.
CHARGE PUMP AIDED REGULATORS
Designing charge pumps with the LT3579 can offer efficient
solutions with fewer components than traditional circuits
because of the master/slave switch configuration on the
IC. The current in the master switch (SW1) is sensed by
the current comparator (A4 in Block Diagram), but the
current in the slave switch (SW2) is not. Note that the slave
switch, SW2, operates in phase with SW1. This method
of operation by the master/slave switches can offer the
following benefits to charge pump designs:
? The slave switch, by not performing a current sense
operation like the master switch, can sustain fairly
large current spikes when the flying capacitors charge
up. Since this current spike flows through SW2, it
does not affect the operation of the current comparator
(A4 in Block Diagram).
? The master switch, immune from the capacitor current
spike, can sense the inductor current more accurately.
? Since the slave switch can sustain large current spikes,
the diodes that feed current into the flying capacitors
do not need current limiting resistors, leading to
efficiency and thermal improvements.
RT V C
SYNC GND SS
86.6k 0.22μF
24V
3.7A,
4.7μH 89W
6.4k
12V 4.7μF
10μF
× 2
SW1 SW2 137k
V OUT1 100k
FAULT FB
LT3579-1
MASTER
SHDN GATE
RT V C
4.7μF SYNC GND SS 47pF 7k
5k 86.6k
35791 F13
Figure 13. 2-Phase Converters Using LT3579-1
High V OUT Charge Pump Topology
The LT3579 can be used in a charge-pump topology (refer
to Figure 16), multiplying the output of an inductive boost
converter. The master switch (SW1) can be used to drive
the inductive boost converter, while the slave switch (SW2)
can be used to drive one or more charge pump stages. This
topology is useful for high voltage applications including
VFD Bias Supplies.
Single Inductor Inverting Topology
If there is a need to use just 1 inductor to generate a
negative output voltage whose magnitude is greater than
V IN , the Single Inductor Inverting topology (shown in
Figure 15) can be used. Since the master and slave switches
are isolated by an external Schottky diode, the current spike
through C1 will flow through the slave switch, thereby
preventing the current comparator (A4 in Block Diagram)
from falsely tripping. Output disconnect is inherently built
into the single inductor topology.
35791f
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT3579EUFD-1#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-1#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:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
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