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參數(shù)資料
| 型號(hào)： | LT4250LCN8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Negative 48V Hot Swap Controller |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 230K |
| 代理商： | LT4250LCN8 |
10
LT4250L/LT4250H
4250lhf
V
EE
V
DD
LT4250L/LT4250H
R4
R5
R6
4
4250 F11
OV
–48V RTN
3
2
–48V
UV
8
V
UV
= 1.255RR5 + R6
(
(
)
)
V
OV
= 1.255R4 + R5+ R6
R6
–48V RTN
(SHORT PIN)
+
V
EE
4
V
DD
LT4250H
SENSE
C1
C3
Q1
R2
R3
C2
R4
R5
R6
R1
3
2
OV
–48V RTN
–48V
UV
5
6
8
1
7
GATE
4250 F12
PWRGD
DRAIN
V
EE
Q3
ACTIVE HIGH
ENABLE MODULE
V
IN+
V
OUT+
V
OUT–
V
IN–
ON/OFF
–48V RTN
(SHORT PIN)
*
* DIODES INC. SMAT70A
4
3
2
1
Q2
V
DL
V
GH
+
+
+
–
+
–
GATE
V
GATE
I
1
internal transistor Q3 is turned off and I
1
and Q2 clamp the
PWRGD pin one SAT drop (
≈
0.3V) above the DRAIN pin.
Transistor Q2 sinks the module’s pull-up current and the
module turns off.
When the DRAIN voltage drops below V
DL
and the GATE
voltage is high, Q3 will turn on, shorting the bottom of I
1
to DRAIN and turning Q2 off. The pull-up current in the
module pulls the PWRGD pin high and enables the
module.
When the DRAIN voltage of the LT4250L is high with
respect to V
EE
or the GATE voltage is low, the internal pull-
down transistor Q2 is off and the PWRGD pin is in a high
impedance state (Figure13). The PWRGD pin will be
pulled high by the module’s internal pull-up current source,
turning the module off. When the DRAIN voltage drops
below V
DL
and the GATE voltage is high, Q2 will turn on and
the PWRGD pin will pull low, enabling the module.
The PWRGD signal can also be used to turn on an LED or
optoisolator to indicate that the power is good as shown
in Figure 14.
Gate Pin Voltage Regulation
When the supply voltage to the chip is more than 20V, the
GATE pin voltage is regulated at 13.5V above V
EE
. The gate
voltage will be no greater than 18V for supply voltages up
to 80V.
APPLICATIO
S I
N
FOR
ATIO
U
Undervoltage and Overvoltage Detection
The UV (Pin 3) and OV (Pin 2) pins can be used to detect
undervoltage and overvoltage conditions at the power
supply input. The UV and OV pins are internally connected
to analog comparators with 130mV and 20mV of hyster-
esis respectively. When the UV pin falls below its threshold
or the OV pin rises above its threshold, the GATE pin is
immediately pulled low. The GATE pin will be held low until
UV is high and OV is low.
The undervoltage and overvoltage trip voltages can be
programmed using a three resistor divider as shown in
Figure 11. With R4 = 549k, R5 = 6.49k and R6 = 10K, the
undervoltage threshold is set to 38.5V (with a 43V release
from undervoltage) and the overvoltage threshold is set to
71V. The resistor divider will also gain up the hysteresis
at the UV pin and OV pin to 4.5V and 1.2V at the input
respectively.
W
U
PWRGD/PWRGD Output
The PWRGD/PWRGD output can be used to directly en-
able a power module when the input voltage to the module
is within tolerance. The LT4250L has a PWRGD output for
modules with an active low enable input, and the LT4250H
has a PWRGD output for modules with an active high
enable input.
When the DRAIN voltage of the LT4250H is high with
respect to V
EE
(Figure 12) or the GATE voltage is low, the
Figure 12. Active High Enable Module
Figure 11. Undervoltage and Overvoltage Sensing
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| LT4250LCN8#PBF | 功能描述:IC CONTRLR HOT SWAP NEG 48V 8DIP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:熱插拔開(kāi)關(guān) 應(yīng)用:通用 內(nèi)部開(kāi)關(guān):是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LT4250LCS8 | 功能描述:IC CONTRLR HOTSWAP NEG 48V 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)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(lèi)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 |
| LT4250LCS8#PBF | 功能描述:IC CONTRLR HOTSWAP NEG 48V 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)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(lèi)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 |
| LT4250LCS8#TR | 功能描述:IC CONTRLR HOTSWAP NEG 48V 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)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(lèi)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 |
| LT4250LCS8#TRPBF | 功能描述:IC CONTRLR HOTSWAP NEG 48V 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)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(kāi)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(lèi)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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