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參數(shù)資料
| 型號： | LTC4361ITS8-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 327K |
| 代理商： | LTC4361ITS8-1#TRPBF |
LTC4361-1/LTC4361-2
12
436112fa
Figure 10. Layout for N-Channel MOSFET Conguration
Figure 8. Setup for Testing 20V Plugged into 5V System
Figure 9. Overvoltage Protection Waveforms
When 20V Plugged into 5V System
LOAD
436112 F08
OUT
M1
Si1470DH
COUT
IN RSENSE
LIN
D1
B160
RIN
20V
WALL
ADAPTER
5V
USB
R1
100k
LTC4361
GND
GATE
+
–
+
–
ICABLE
SENSE
IN
OUT
VIN
20V/DIV
VGATE
10V/DIV
VOUT
5V/DIV
ICABLE
10A/DIV
1μs/DIV
436112 F09
FIGURE 8 CIRCUIT
RIN = 150mΩ
LIN = 2μH, RSENSE = 25mΩ, LOAD = 10Ω
COUT = 10μF (16V, SIZE 1210)
LTC4361
436112 F10
8
6
5
1
7
2
3
4
Si1470DH
OUT
IN
SUPPLY
GND
RSENSE
1
2
3
6
5
4
Figure 8 shows a particularly severe situation which can
occur in a mobile device with dual power inputs. A 20V wall
adaptor is mistakenly hot-plugged into the 5V device with
the USB input already live. As shown in Figure 9, a large
current can build up in LIN to charge up COUT. When the
N-channel MOSFET shuts off, the energy stored in LIN is
dumped into COUT, causing a large 40V input transient. The
LTC4361 limits this to a 1V rise in the output voltage.
If the
VOUT due to the discharge of the energy in LIN into
COUT is not acceptable or the avalanche capability of the
MOSFET is exceeded, an additional external clamp such
as the SMAJ24A can be placed between IN and GND. COUT
is the decoupling capacitor of the protected circuits and
its value will largely be determined by their requirements.
Using a larger COUT will work with LIN to slow down the
dV/dt at OUT, allowing time for the LTC4361 to shut off the
MOSFET before VOUT overshoots to a dangerous voltage.
A larger COUT also helps to lower the VOUT due to the
discharge of the energy in LIN if the MOSFET BVDSS is
used as an input clamp.
Layout Considerations
Figure 10 shows an example PCB layout for the LTC4361
(TS8 package) with a single N-channel MOSFET (SC70
package) and a 0603 size sense resistor. Keep the traces
to the N-channel MOSFET wide and short. The PCB traces
associated with the power path through the N-channel
MOSFET should have low resistance. Use Kelvin connec-
tions to RSENSE for an accurate overcurrent threshold.
APPLICATIONS INFORMATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC4361ITS8-2#PBF | 制造商:Linear Technology 功能描述:Bulk |
| LTC4361ITS8-2#TRMPBF | 功能描述:IC OVERVOLT PROT CONT TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4361ITS8-2#TRPBF | 功能描述:IC CTLR OVP AUTO RETRY TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4362CDCB-1#PBF | 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROTECTION 8DFN 制造商:Linear Technology 功能描述:IC, OVERVOLTAGE PROTECTION, 8DFN; Supply Voltage Min:2.5V; Supply Voltage Max:5.5V; Operating Temperature Min:0C; Operating Temperature Max:70C; Digital IC Case Style:DFN; No. of Pins:8; MSL:MSL 1 - Unlimited; Package / Case:8-DFN ;RoHS Compliant: Yes |
| LTC4362CDCB-1#TRMPBF | 功能描述:IC OVP/OVC PROTECT LATCHOFF 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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