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| 型號(hào)： | 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(yè)數(shù)： | 14/16頁(yè) |
| 文件大小： | 327K |
| 代理商： | LTC4361ITS8-1#TRPBF |
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LTC4361-1/LTC4361-2
7
436112fa
The typical LTC4361 application protects 2.5V to 5.5V
systems in portable devices from power supply overvolt-
age. The basic application circuit is shown in Figure 1.
Device operation and external component selection is
discussed in detail in the following sections.
APPLICATIONS INFORMATION
Figure 1. Protection from Input Overvoltage and Overcurrent
GATE
M1
Si1470DH
RSENSE
0.025Ω
SENSE
IN
436112 F01
VOUT
5V
1.5A
VIN
5V
LTC4361
OUT
PWRGD
ON
GND
COUT
10μF
The GATE ramp rate is limited to 3V/ms. VOUT follows at
a similar rate which results in an inrush current into the
load capacitor COUT of:
IINRUSH = COUT
dVGATE
dt
= C
OUT 3 mA/F
[]
The servo loop is compensated by the parasitic capaci-
tance of the external MOSFET. No further compensation
components are normally required. In the case where
the parasitic capacitance is less than 100pF, a 100pF
compensation capacitor between GATE and ground may
be required.
An even slower GATE ramp and lower inrush current
can be achieved by connecting an external capacitor, CG,
from GATE to ground. The voltage at GATE then ramps
up with a slope equal to 10μA/CG [V/s]. Choose CG using
the formula:
CG =
10A
IINRUSH
COUT
Overvoltage
When power is rst applied, VIN must remain below 5.7V
(VIN(OV) – VOV) for more than 130ms before GATE is
ramped up to turn on the MOSFET. If VIN then rises above
5.8V (VIN(OV)), the overvoltage comparator activates the
30mA fast pull-down on GATE within 1μs. After an over-
voltage condition, the MOSFET is held off until VIN once
again remains below 5.7V for 130ms.
Overcurrent
The overcurrent comparator protects the MOSFET from
excessive current. It trips when the SENSE pin falls more
than 50mV below IN for 10μs. When the overcurrent
comparator trips, GATE is pulled low quickly and the
PWRGDpull-downreleases.TheLTC4361-2automatically
tries to apply power again after a 130ms start-up delay.
Start-Up
When VIN is less than the undervoltage lockout level of
2.1V, the GATE driver is held low and the PWRGD pull-down
is high impedance. When VIN rises above 2.1V and ON is
held low, a 130ms delay cycle starts. Any undervoltage or
overvoltage event at IN (VIN < 2.1V or VIN > 5.7V) restarts
the delay cycle. This delay allows the N-channel MOSFET
to isolate the output from any input transients that occur
at start-up. When the delay cycle completes, GATE starts
its slow ramp-up.
GATE Control
An internal charge pump provides a gate overdrive greater
than 3.5V when 2.5V ≤ VIN < 3V. If VIN ≥ 3V, the gate drive
is guaranteed to be greater than 4.5V. This allows the use
of logic-level N-channel MOSFETs. An internal 6V clamp
between GATE and OUT protects the MOSFET gate.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(wú) 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(wú) 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(wú) 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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