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參數(shù)資料
| 型號： | LTC1642CGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 243K |
| 描述： | IC CONTROLLER HOTSWAP ADJ 16SSOP |
| 標準包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用型 Infiniband? |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 2.97 V ~ 16.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
13
LTC1642
1642fb
The pull-up voltage on the RESET and FAULT pins follows
V
CC
until the shunt regulator turns on. When the regulator
is on the pull-up voltage is 14.4V.
Undervoltage Monitor
The LTC1642 will assert RESET if a monitored voltage falls
below an adjustable minimum. When the monitored volt-
age has exceeded its minimum for at least one system
timing cycle, RESET goes high. The monitoring circuitry
comprises an internal 1.22V bandgap reference, an inter-
nal precision voltage comparator and an external resistive
divider to monitor the output supply voltage.
The circuit is shown in Figure 12, and typical waveforms
in Figure 13. When the voltage at the FB pin rises above its
reset threshold (1.22V), the comparator output goes low
and a timing cycle starts (times 1 and 5). Following the
cycle RESET is pulled high. At time 2 the voltage at FB
drops below the comparators threshold and RESET is
pulled low. If the FB pin rises above the reset threshold for
less than a timing cycle the RESET output will remain low
(time 3 to time 4). The 15礎(chǔ) pull-up current source to V
CC
on RESET has a series diode so the pin can be pulled above
V
CC
by an external pull-up resistor without forcing current
back into the supply.
Automatic Restart
If there is an overvoltage, and the resistor divider feeding
OV is connected to the output of the N-Channel pass
transistor, the LTC1642 will automatically restart even if
FAULT is not tied to ON. If the divider is connected to the
input side, the LTC1642 will restart itself only if FAULT is
tied to ON, and only after the overvoltage clears.
The OV and FB Comparators
The propagation delay through the OV and FB compara-
tors on low to high transitions depends strongly on the
differential input voltage. The relationship is shown in
Figure 11. The minimum propagation delay for large
overdrives is about 20祍. In addition the comparators
have 3mV of hysteresis.
Internal Voltage Clamp Protection
The LTC1642 includes a shunt regulator to protect itself
from V
CC
and SENSE pin voltages up to 33V. The regulator
turns on when V
CC
exceeds 16.5V and limits most of the
chips circuitry to 15V. When it is on the chip functions
normally with one exception: if the charge pump is on, the
GATE voltage is usually near ground but this is not
guaranteed. Use the OV pin to ensure that GATE is grounded.
APPLICATIO S I FOR ATIO
U
U
U
Figure 10. Overvoltage Timing (Output Side)
OV OVERDRIVE (mV)
0
40
80 120 160 200 240
1642 F11
70
60
50
40
30
20
10
0
Figure 11. OV Comparator Propagation Delay vs
Overdrive Voltage
100ms/DIV
1642 F10
IN
OV
GATE
OUT
CRWBR
RST TMR
FAULT
20V/DIV
2V/DIV
20V/DIV
20V/DIV
2V/DIV
2V/DIV
20V/DIV
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| LTC1642IGN | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC1642IGN#PBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC1642IGN#TR | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC1642IGN#TRPBF | 功能描述:IC CONTROLLER HOTSWAP ADJ 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC1643AHCGN | 功能描述:IC CTRLR HOTSWAP PCI BUS 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
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