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参数资料
| 型号： | LTC4227CGN-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 20/20页 |
| 文件大小： | 307K |
| 代理商： | LTC4227CGN-1#PBF |
LTC4227-1/LTC4227-2
9
422712f
operaTion
The LTC4227 functions as an input supply diode-OR
with inrush current limiting and overcurrent protection
by controlling the external N-channel MOSFETs (MD1,
MD2 and MH) on a supply path. This allows boards to be
safely inserted and removed in systems with a backplane
powered by redundant supplies. The LTC4227 has a
single Hot Swap controller and two separate ideal diode
controllers, each providing independent control for the
two input supplies.
When the LTC4227 is first powered up, the gates of the
MOSFETsareallheldlow,keepingthemoff.AstheDGATE2
pull-up can be disabled by the D2ON pin, DGATE2 will pull
high only when the D2ON pin is pulled low. The gate drive
amplifier (GA1, GA2) monitors the voltage between the
IN and SENSE+ pins and drives the respective DGATE pin.
The amplifier quickly pulls up the DGATE pin, turning on
the MOSFET for ideal diode control, when it senses a large
forwardvoltagedrop.WiththeidealdiodeMOSFETsacting
as an input supply diode-OR, the SENSE+ pin voltage rises
to the highest of the supplies at the IN1 and IN2 pins. The
stored charge in an external capacitor connected between
the CPO and IN pins provides the charge needed to quickly
turn on the ideal diode MOSFET. An internal charge pump
charges up this capacitor at device power-up. The DGATE
pin sources current from the CPO pin and sinks current
into the IN and GND pins.
Pulling the ON pin high and EN pin low initiates a 100ms
debounce timing cycle. After this timing cycle, a 10A cur-
rent source from the charge pump ramps up the HGATE
pin. When the Hot Swap MOSFET turns on, the inrush
current is limited at a level set by an external sense resistor
(RS) connected between the SENSE+ and SENSE– pins.
An active current limit amplifier (A1) servos the gate of
the MOSFET to 65mV across the current sense resistor.
Inrush current can be further reduced, if desired, by add-
ing a capacitor from HGATE to GND. When the MOSFET’s
gate overdrive (HGATE to OUT voltage) exceeds 4.2V, the
PWRGD pin pulls low.
When the ideal diode MOSFET is turned on, the gate drive
amplifiercontrolsDGATEtoservotheforwardvoltagedrop
(VIN – VSENSE+) across the MOSFET to 25mV. If the load
current causes more than 25mV of voltage drop, the gate
voltage rises to enhance the MOSFET. For large output cur-
rents, the MOSFET’s gate is driven fully on and the voltage
drop is equal to ILOAD RDS(ON) of the MOSFET.
In the case of an input supply short-circuit when the
MOSFETs are conducting, a large reverse current starts
flowing from the load towards the input. The gate drive
amplifier detects this failure condition as soon as it ap-
pears and turns off the ideal diode MOSFET by pulling
down the DGATE pin.
Inthecasewhereanovercurrentfaultoccursonthesupply
output, the current is limited to 65mV/RS.Afterafaultfilter
delay set by 100A charging the TMR pin capacitor, the
circuit breaker trips and pulls the HGATE pin low, turning
off the Hot Swap MOSFET. The FAULT pin is latched low.
At this point, the DGATE pin continues to pull high and
keeps the ideal diode MOSFET on.
Internal clamps limit both the DGATE to IN and CPO to IN
voltages to 12V. The same clamp also limits the CPO and
DGATE pins to a diode voltage below the IN pin. Another
internal clamp limits the HGATE to OUT voltage to 12V
and also clamps the HGATE pin to a diode voltage below
the OUT pin.
Power to the LTC4227 is supplied from either the IN or
OUT pins, through an internal diode-OR circuit to a low
dropout regulator (LDO). That LDO generates a 5V supply
at the INTVCC pin and powers the LTC4227’s internal low
voltage circuitry.
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| LTC4227CGN-2#PBF | 功能描述:IC CTLR HOT SWAP DUAL 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4227CGN-2#TRPBF | 功能描述:IC CTRLR HOT SWAP 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4227CUFD-1#PBF | 功能描述:IC CTRLR HOT SWAP 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4227CUFD-1#TRPBF | 功能描述:IC CTRLR HOT SWAP 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4227CUFD-2#PBF | 功能描述:IC CTRLR HOT SWAP 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
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