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参数资料
| 型号： | LTC4365CTS8#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件页数： | 4/16页 |
| 文件大小： | 369K |
| 代理商： | LTC4365CTS8#TRMPBF |
LTC4365
12
4365f
The trace at VOUT, on the other hand, does not respond
to the negative voltage at VIN, demonstrating the desired
reverse supply protection. The waveforms of Figure 7 were
captured using a 40V dual N-channel MOSFET, a 10μF
ceramic output capacitor and no load current on VOUT.
Recovery Timer
The LTC4365 has a recovery delay timer that filters noise
at VIN and helps prevent chatter at VOUT. After either an OV
or UV fault has occurred, the input supply must return to
the desired operating voltage window for at least 36ms in
order to turn the external MOSFET back on as illustrated
in Figures 4 and 5.
Going out of and then back into fault in less than 36ms
will keep the MOSFET off continuously. Similarly, coming
out of shutdown (SHDN low to high) triggers an 800μs
start-up delay timer (see Figure 10).
The recovery timer is also active while the LTC4365 is
powering up. The 36ms timer starts once VIN rises above
VIN(UVLO) and VIN lies within the user selectable UV/OV
power good window. See Figure 8.
Gentle Shutdown
The SHDN input turns off the external MOSFETs in a
gentle, controlled manner. When SHDN is asserted low,
a 90μA current sink slowly begins to turn off the external
MOSFETs.
Once the voltage at the GATE pin falls below the voltage
at the VOUT pin, the current sink is throttled back and a
feedback loop takes over. This loop forces the GATE voltage
to track VOUT, thus keeping the external MOSFETs off as
VOUT decays. Note that when VOUT < 4.5V, the GATE pin
is pulled to within 400mV of ground.
Gentle gate turn off reduces load current slew rates and
mitigates voltage spikes due to parasitic inductances.
To further decrease GATE pin slew rate, place a capaci-
tor across the gate and source terminals of the external
MOSFETs. The waveforms of Figure 9 were captured using
the Si4230 dual N-channel MOSFETs, and a 2A load with
100μF output capacitor.
APPLICATIONS INFORMATION
4365 F08
GATE
MOSFET OFF
MOSFET ON
VIN
VIN(UVLO)
tRECOVERY
Figure 8. Recovery Timing During Power-On
(OV = GND, UV = SHDN = VIN)
Figure 9. Gentle Shutdown: GATE Tracks VOUT as
VOUT Decays
GATE
VOUT
tGATE(SLOW)
GATE = VOUT
tSTART
tSHDN(F)
ΔVGATE
SHDN
4365 F10
FAULT
Figure 10. Gentle Shutdown Timing
FAULT Status
The FAULT high voltage open drain output is driven low if
SHDN is asserted low, if VIN is outside the desired UV/OV
voltage window, or if VIN has not risen above VIN(UVLO).
Figures 4, 5 and 10 show the FAULT output timing.
5V/DIV
4365 F9
100μs/DIV
GATE
VOUT
SHDN
VIN = 12V
T = 25°C
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4365HDDB#PBF | 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, DFN-8; Controller Applications:Automotive, Industrial Automation, Laptops, Portable Instrumentation; Internal Switch:No; Supply Voltage Min:2.5V; Supply Voltage Max:34V; Digital IC Case Style:DFN ;RoHS Compliant: Yes |
| LTC4365HDDB#TRMPBF | 功能描述:IC OVERVOLTAGE PROTECT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC4365HDDB#TRPBF | 功能描述:IC OVERVOLTAGE PROTECT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC4365HDDB-1#TRMPBF | 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROTECT 8-DFN 制造商:Linear Technology 功能描述:IC, SUPPLY PROTECTION CONTROL, DFN-8 制造商:Linear Technology 功能描述:OV, UV & REVERSE CONTROLLER, DFN-8, Brief Features:-, Supply Voltage Min:2.5V, Supply Voltage Max:34V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:DFN, No. of Pins:8, Package / Case:8-DFN |
| LTC4365HDDB-1#TRPBF | 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROTECT 8-DFN 制造商:Linear Technology 功能描述:OV, UV & REVERSE CONTROLLER, DFN-8, Brief Features:-, Supply Voltage Min:2.5V, Supply Voltage Max:34V, Operating Temperature Min:-40C, Operating Temperature Max:125C, Digital IC Case Style:DFN, No. of Pins:8, Package / Case:8-DFN |
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