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参数资料
| 型号： | LTC4217IFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, SSOP-20 |
| 文件页数： | 16/18页 |
| 文件大小： | 238K |
| 代理商： | LTC4217IFE#TRPBF |
LTC4217
7
4217fe
pin FuncTions
FB: Foldback and Power Good Input. Connect this pin to
an external resistive divider from OUT for the LTC4217
(adjustable) version. The LTC4217-12 version uses a fixed
internal divider with optional external adjustment. Open
the pin if the LTC4217-12 thresholds for 12V operation are
desired. If the voltage falls below 0.6V, the current limit is
reduced using a foldback profile (see the Typical Perfor-
mance Characteristics section). If the voltage falls below
1.21V, the PG pin will pull low to indicate the power is bad.
FLT: Overcurrent Fault Indicator. Open-drain output pulls
low when an overcurrent fault has occurred and the circuit
breaker trips. For overcurrent auto-retry tie to UV pin (see
the Applications Information section for details).
GATE: Gate Drive for Internal N-channel MOSFET. An
internal 24A current source charges the gate of the
N-channel MOSFET. At start-up the GATE pin ramps up at
a 0.3V/ms rate determined by internal circuitry. During an
undervoltage or overvoltage condition a 250A pull-down
current turns the MOSFET off. During a short-circuit or
undervoltage lockout condition, a 140mA pull-down cur-
rent source between GATE and OUT is activated.
GND: Device Ground.
IMON: Current Monitor Output. The current in the internal
MOSFET switch is divided by 20,000 and sourced from this
pin. Placing a 20k resistor from this pin to GND creates a
0V to 2V voltage swing when current ranges from 0A to 2A.
INTVCC: Internal 3V Supply Decoupling Output. This pin
must have a 0.1F or larger bypass capacitor.
ISET: Current Limit Adjustment Pin. For a 2A current limit
value open this pin. This pin is driven by a 20k resistor in
series with a voltage source. The pin voltage is used to
generatethecurrentlimitthreshold.Theinternal20kresistor
and an external resistor between ISET and ground create
an attenuator that lowers the current limit value. In order
to match the temperature variation of the sense resistor,
the voltage on this pin increases at the same rate as the
sense resistance increases. Therefore the voltage at ISET
pin is proportional to temperature of the MOSFET switch.
OUT: Output of Internal MOSFET Switch. Connect this pin
directly to the load. In the LTC4217-12 version, the PG
comparator monitors an internal resistive divider between
the OUT pin and GND.
OV: Overvoltage Comparator Input. Connect this pin to an
external resistive divider from VDDfortheLTC4217(adjust-
able) version. The LTC4217-12 version uses a fixed internal
dividerwithoptionalexternaladjustmentfor12Voperation.
Open the pin if the LTC4217-12 thresholds are desired. If
the voltage at this pin rises above 1.235V, an overvoltage
is detected and the switch turns off. Tie to GND if unused.
PG: Power Good Indicator. Open-drain output pulls low
when the FB pin drops below 1.21V indicating the power is
bad. If the FB pin rises above 1.23V and the GATE to OUT
voltage exceeds 4.2V, the open-drain pull-down releases
the PG pin to go high.
SENSE: Current Sense Node and MOSFET Drain. The
current limit circuit controls the GATE pin to limit the
sense voltage between the VDD and SENSE pins to 15mV
(2A) or less depending on the voltage at the FB pin. The
exposed pad on DHC and FE packages are connected to
SENSE and must be soldered to an electrically isolated
printed circuit board trace to properly transfer the heat
out of the package.
TIMER: Timer Input. Connect a capacitor between this pin
and ground to set a 12ms/F duration for current limit
before the switch is turned off. If the UV pin is toggled
low while the MOSFET switch is off, the switch will turn
on again following a cooldown time of 518ms/F duration.
Tie this pin to INTVCC for a fixed 2ms overcurrent delay
and 100ms auto-retry time.
UV: Undervoltage Comparator Input. Tie high if unused.
ConnectthispintoanexternalresistivedividerfromVDDfor
theLTC4217(adjustable)version.TheLTC4217-12version
drives the UV pin with an internal resistive divider from
VDD. Open the pin if the preset LTC4217-12 thresholds for
12V operation are desired. If the UV pin voltage falls below
1.15V,anundervoltageisdetectedandtheswitchturnsoff.
Pulling this pin below 0.62V resets the overcurrent fault
and allows the switch to turn back on (see the Applications
Information section for details). If overcurrent auto-retry
is desired then tie this pin to the FLT pin.
VDD: Supply Voltage and Current Sense Input. This pin
has an undervoltage lockout threshold of 2.73V.
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相关代理商/技术参数 |
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| LTC4218 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Hot Swap Controller |
| LTC4218CDHC-12#PBF | 功能描述:IC CTLR HOT SWAP 16-DFN 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 |
| LTC4218CDHC-12#TRPBF | 功能描述:IC CNTRLR HOT SWAP 16-DFN 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 |
| LTC4218CDHC-12-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller |
| LTC4218CDHC-12-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller |
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