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参数资料
| 型号： | LTC4225IUFD-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/24页 |
| 文件大小： | 346K |
| 描述： | IC CONTROLLER HOT SWAP 24-QFN |
| 标准包装： | 73 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 2.9 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（5x4） |
| 包装： | 管件 |
LTC4225-1/LTC4225-2
7
422512f
pin FuncTions
INTV
CC
: Internal 5V Supply Decoupling Output. This pin
must have a 0.1礔 or larger capacitor. An external load of
less than 500礎 can be connected at this pin.
ON1, ON2: On Control Input. A rising edge above 1.235V
turns on the external Hot Swap MOSFET and a falling edge
below 1.155V turns it off. Connect this pin to an external
resistive divider from IN to monitor the supply undervolt-
age condition. Pulling the ON pin below 0.6V resets the
electronic circuit breaker.
OUT1, OUT2: Output Voltage Sense and MOSFET Gate
Drive Return. Connect this pin to the output side of the
external MOSFET . The voltage sensed at this pin is used
to control DGATE. The gate fast pull-down current returns
through this pin when HGATE is discharged.
PWRGD1, PWRGD2: Power Status Output. Open-drain
output that is normally pulled high by a 10礎 current
source to a diode below INTV
CC
. It may be pulled above
INTV
CC
using an external pull-up. It pulls low when the
MOSFET gate drive between HGATE and OUT exceeds
the gate-to-source voltage of 4.2V . Leave open if unused.
SENSE1, SENSE2: Negative Current Sense Input. Connect
this pin to the output of the current sense resistor. The
current limit circuit controls HGATE to limit the voltage
between IN and SENSE to 65mV . A circuit breaker trips
when the sense voltage exceeds 50mV for more than a
fault filter delay configured at the TMR pin.
TMR1, TMR2: Timer Capacitor Terminal. Connect a capaci-
tor between this pin and ground to set a 12ms/礔 duration
for current limit before the external Hot Swap MOSFET
is turned off. The duration of the off time is 617ms/礔 ,
resulting in a 2% duty cycle.
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