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參數(shù)資料
| 型號： | LTC4365HDDB#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： | 3 X 2 MM, LEAD FREE, PLASTIC, M0-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 369K |
| 代理商： | LTC4365HDDB#TRPBF |
LTC4365
11
4365f
APPLICATIONS INFORMATION
The resistor values can then be solved:
1. R1+ R2 =
3mV
10nA
= 300k
2. R3 = 2
3mV
10nA
(3.5V – 0.5V) =1.8M
The closest 1% value: R3 = 1.82M:
3. R1 =
300k +1.82M
2 18V
= 58.9k
The closest 1% value: R1 = 59k:
R2 = 300k – 59k = 241k
The closest 1% value: R2 = 243k
Therefore: OV = 17.93V, UV = 3.51V.
Reverse VIN Protection
The LTC4365’s rugged and hot-swappable VIN input helps
protect the more sensitive circuits at the output load. If
the input supply is plugged in backwards, or a negative
supply is inadvertently connected, the LTC4365 prevents
this negative voltage from passing to the output load.
The LTC4365 employs a novel, high speed reverse sup-
ply voltage monitor. When the negative VIN voltage is
detected, an internal switch connects the gates of the
external back-to-back N-channel MOSFETs to the nega-
tive input supply.
As shown in Figure 6, external back-to-back N-channel
MOSFETs are required for reverse supply protection. When
VIN goes negative, the reverse VIN comparator closes the
internal switch, which in turn connects the gates of the
external MOSFETs to the negative VIN voltage. The body
diode (D1) of M1 turns on, but the body diode (D2) of M2
remains in reverse blocking mode. This means that the
common source connection of M1 and M2 remains about
a diode drop higher than VIN. Since the gate voltage of
M2 is shorted to VIN, M2 will be turned off and no cur-
rent can flow from VIN to the load at VOUT. Note that the
voltage rating of M2 must withstand the reverse voltage
excursion at VIN.
Figure 7 illustrates the waveforms that result when VIN
is hot plugged to –20V. VIN, GATE and VOUT start out at
ground just before the connection is made. Due to the
parasitic inductance of the VIN and GATE connections, the
voltage at the VIN and GATE pins ring significantly below
–20V. Therefore, a 40V N-channel MOSFET was selected
to survive the overshoot.
The speed of the LTC4365 reverse protection circuits is
evident by how closely the GATE pin follows VIN during
the negative transients. The two waveforms are almost
indistinguishable on the scale shown.
Figure 6. Reverse VIN Protection Circuits
VIN
4365 F06
VOUT
GATE
VIN = –40V
REVERSE VIN
COMPARATOR
CLOSES SWITCH
WHEN VIN IS NEGATIVE
GND
LTC4365
M1
D1
D2
M2
+
–
+
TO LOAD
COUT
Figure 7. Hot Swapping VIN to –20V
–20V
5V/DIV
GND
4365 F07
500ns/DIV
GATE
VOUT
VIN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4365HTS8#PBF | 制造商:Linear Technology 功能描述:UV,OV and Reverse Supply Protection Controller 8-Pin TSOT-23 制造商:Linear Technology 功能描述:Bulk 制造商:Linear Technology 功能描述:PROTECTION CONTROLLER 2.5V TO 制造商:Linear Technology 功能描述:PROTECTION CONTROLLER, 2.5V TO 34V, TSOT-23-8; Controller Applications:Automotive, Industrial Automation, Laptops, Portable Instrumentation; Internal Switch:No; Supply Voltage Min:2.5V; Supply Voltage Max:34V; No. of Pins:8 ;RoHS Compliant: Yes |
| LTC4365HTS8#TRMPBF | 功能描述:IC OVERVOLTAGE PROT TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤 包裝:管件 產(chǎn)品目錄頁面:1410 (CN2011-ZH PDF) |
| LTC4365HTS8#TRPBF | 功能描述:IC OVERVOLTAGE PROT TSOT23-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC4365HTS8-1#TRMPBF | 制造商:Linear Technology 功能描述:OV, UV AND REVERSE-SUPPLY PROT 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROT TSOT23-8 制造商:Linear Technology 功能描述:OV, UV & REVERSE CONTROLLER, TSOT-23-8, Brief Features:-, Supply Voltage Min:2.5V, Supply Voltage Max:34V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:TSOT-23, No. of Pins:8 |
| LTC4365HTS8-1#TRPBF | 制造商:Linear Technology 功能描述:OV, UV AND REVERSE-SUPPLY PROT 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROT TSOT23-8 制造商:Linear Technology 功能描述:OV, UV & REVERSE CONTROLLER, TSOT-23-8, Brief Features:-, Supply Voltage Min:2.5V, Supply Voltage Max:34V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:TSOT-23, No. of Pins:8 |
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