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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： | 20/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
27
35791f
appenDix
Table 6 shows a list of several ceramic capacitor man-
ufacturers. Consult the manufacturers for detailed infor-
mation on their entire selection of ceramic parts.
Table 6. Ceramic Capacitor Manufacturers
TDK
www.tdk.com
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
PMOS SELECTION
An external PMOS, controlled by the LT3579’s GATE pin,
can be used to facilitate input or output disconnect. The
GATE pin turns on the PMOS gradually during start-up
(seeSoft-StartofExternalPMOSintheOperationsection),
and turns the PMOS off when the LT3579 is in shutdown
or in fault.
The use of the external PMOS, controlled by the GATE pin,
is particularly beneficial when dealing with unintended
output shorts in a boost regulator. In a conventional boost
regulator,theinductor,Schottkydiode,andpowerswitches
are susceptible to damage in the event of an output short
toground.UsinganexternalPMOSintheboostregulator’s
power path (path from VIN to VOUT) controlled by the GATE
pin, will serve to disconnect the input from the output
when the output has a short to ground, thereby helping
save the IC, and the other components in the power path
from damage.
The PMOS chosen must be capable of handling the
maximum input or output current depending on whether
the PMOS is used at the input (see Figure 12) or the output
(see Figure 13).
EnsurethatthePMOSisbiasedwithenoughsourcetogate
voltage (VSG) to enhance the device into the triode mode
of operation. The higher the VSG voltage that biases the
PMOS,thelowertheRDSONofthePMOS,therebylowering
power dissipation in the device during normal operation,
as well as improving the efficiency of the application in
which the PMOS is used. The following equations show
the relationship between RGATE (see Block Diagram) and
the desired VSG that the PMOS is biased with:
VSG =
VS
RGATE
RGATE + 2k
if VGATE <2V
933A
RGATE if VGATE >2V
WhenusingaPMOS,itisadvisabletoconfigurethespecific
application for undervoltage lockout (see the Operations
section). The goal is to have VIN get to a certain minimum
voltage where the PMOS has sufficient headroom to attain
a high enough VSG, which prevents it from entering the
saturation mode of operation during start-up.
Figure 6 shows the PMOS connected in series with the
output to act as an output disconnect during a fault
condition. The Schottky diode from the VIN pintotheGATE
pin is optional and helps turn off the PMOS quicker in the
event of hard shorts. The resistor from VIN to the SHDN
pin sets a UVLO of 4V for this application.
ConnectingthePMOSinserieswiththeoutputofferscertain
advantages over connecting it in series with the input:
Since the load current is always less than the input
current for a boost converter, the current rating of the
PMOS goes down when connected in series with the
output as opposed to the input.
A PMOS in series with the output can be biased with
a higher overdrive voltage than a PMOS used in series
with the input, since VOUT > VIN. This higher overdrive
resultsinalowerRDSONforthePMOS,therebyimproving
the efficiency of the regulator.
In contrast, an input connected PMOS works as a simple
hot-plug controller (covered in more detail in the Hot-Plug
section). The input connected PMOS also functions as an
inexpensive means of protecting against multiple output
shorts in boost applications that synchronize the LT3579
with other compatible ICs (see Figure 12).
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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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