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| 型号： | LT3579EFE-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO20 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件页数： | 15/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
22
35791f
applicaTions inForMaTion
Use the following equations to calculate the FB resistor
for 2-phase converters:
RFB =
VOUT – 1.215V
2
83.3A
; Boost or SEPIC
Multiphase Converter
RFB =
| VOUT | + 9mV
2
83.3A
; Inverting Multiphase
Converter
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.
ItispossibletousetheLT3579-1inamultiphaseconverter
of more than 2 phases. Consult the LTC Applications
Engineering Department for more information.
CHARGE PUMP AIDED REGULATORS
DesigningchargepumpswiththeLT3579canofferefficient
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.
4.7H
VPWR
12V
VIN
5V
VOUT
24V
3.7A,
89W
VOUT1
VPWR
10F
4.7F
10F
4.7F
×2
0.22F
4.7F
×2
137k
35791 F13
SW1 SW2
VIN
CLKOUT
GATE
VC
SS
GND
FB
FAULT
SYNC
SHDN
RT
LT3579-1
MASTER
SW1 SW2
VIN
CLKOUT
GATE
VC
SS
GND
FB
FAULT
SYNC
SHDN
RT
LT3579-1
SLAVE
86.6k
6.4k
7k
2.2nF
47pF
0.22F
5k
86.6k
21.5k
500k
100k
4.7F
×2
Figure 13. 2-Phase Converters Using LT3579-1
High VOUT 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
theinductiveboostconverter,whiletheslaveswitch(SW2)
canbeusedtodriveoneormorechargepumpstages.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
VIN, the Single Inductor Inverting topology (shown in
Figure15)canbeused.Sincethemasterandslaveswitches
areisolatedbyanexternalSchottkydiode,thecurrentspike
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.
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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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