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参数资料
| 型号： | LTC4222CUH#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD-X, QFN-32 |
| 文件页数： | 8/32页 |
| 文件大小： | 280K |
| 代理商： | LTC4222CUH#TRPBF |
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LTC4222
16
4222fa
APPLICATIONS INFORMATION
fault is declared for that supply and the MOSFET is turned
off. If the CONFIG pin is low, then both channels will turn
off together. After the switch has turned off due to an
OC fault the part will wait for a cool-down period before
allowing the switch to turn on again. If the TIMER pin is
tied to VCC the cool-down period will be 5 seconds on the
internal timer. Otherwise if using a TIMER capacitor, the
capacitor will discharge at 2μA and the internal 100ms timer
is started, when the 100ms timer expires and the TIMER
pin reaches its 0.2V lower threshold the part is allowed to
restart if the overcurrent fault bit (FAULT register bit 2) has
been cleared or the overcurrent auto-retry bit (CONTROL
register bit 2) has been set.
After start-up, a supply has dual-level glitch-tolerant protec-
tion against overcurrent faults. The sense resistor voltage
drop is monitored by a 50mV electronic circuit breaker and
a 150mV active current limit. In the event that a supply’s
current exceeds the circuit breaker threshold, an internal
20μs timer is started. If the supply is still overcurrent after
20μs the circuit breaker trips and the switch is turned off.
An analog current limit loop prevents the supply current
from exceeding exceeding the 150mV current limit in
the event of a short circuit. The 20μs lter delay and the
higher current limit threshold prevent unnecessary resets
of the board due to minor current surges. The LTC4222
will stay in the latched off state unless the overcurrent
auto-retry bit (CONTROL register bit 2) is set, in which
case the switch turns on again after 100ms when using
the external TIMER capacitor to set the start-up time, or
5 seconds when using the internal timer. Note that current
limit foldback is not active after start-up.
Overvoltage Fault
An overvoltage fault occurs when an OV pin rises above
its 1.235V threshold for more than 2μs. This shuts off
the corresponding GATE with a 1mA current to ground
and sets the overvoltage present STATUS bit 0 and the
overvoltage FAULT bit 0. If the pin subsequently falls back
below the threshold for 100ms, the GATE is allowed to turn
on again unless overvoltage auto-retry has been disabled
by clearing CONTROL bit 0. If the CONFIG pin is tied low,
an OV fault on either channel will shut off both channels
simultaneously.
Undervoltage Fault
An undervoltage fault occurs when a UV pin falls below
its 1.235V threshold for more than 2μs. This turns off the
corresponding GATE with a 1mA current to ground and
sets undervoltage present STATUS bit 1 and undervoltage
FAULT bit 1. If the UV pin subsequently rises above the
threshold for 100ms, the GATE is turned on again unless
undervoltage auto-retry has been disabled by clearing
CONTROL bit 1. When power is applied to the device, if
UV is below its 1.235V threshold after INTVCC crosses its
2.64V undervoltage lockout threshold, an undervoltage
fault is logged in the FAULT register. If the CONFIG pin is
tied low, an UV fault on either channel will shut off both
channels simultaneously.
ON Signals and the CONFIG Pin
Turn-on commands are issued from the ON pins or the I2C
interface. Internally, rising and falling edges of the ON pins
set and reset the FET_ON register bits. Unlike the other
control signals such as UV, OV and EN, the rising edge of
the ON signal is not ltered by the 100ms internal timer and
instead turns on the corresponding channel immediately.
Cycling an ON signal cancels the corresponding channel’s
overcurrent auto-retry cool-down period, allowing the
channel to restart after a 100ms delay.
To start up and shut down both channels at the same time
set the CONFIG pin low. Both channels then start up when
all the UV, OV, EN and ON signals are in the correct state
to turn on both channels, and when any of these signals
turns one channel off, both channels turn off.
Figure 3. Short-Circuit Waveform
VGPIO
5V/DIV
VGATE
10V/DIV
CL = 0F
RSHORT = 5mΩ
RS = 20mΩ
RG = 1k
CG = 1μF
VSOURCE
10V/DIV
LOAD CURRENT
5A/DIV
4222 F03
10μs/DIV
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相关代理商/技术参数 |
参数描述 |
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| LTC4222IG#PBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4222IG#TRPBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4222IG-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Hot Swap Controller with I2C Compatible Monitoring |
| LTC4222IG-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Hot Swap Controller with I2C Compatible Monitoring |
| LTC4222IUH#PBF | 功能描述:IC CTRLR DUAL HOT SWAP 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
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