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参数资料
| 型号： | TPS22942DCKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | GREEN, PLASTIC, SC-70, 5 PIN |
| 文件页数： | 5/19页 |
| 文件大小： | 537K |
| 代理商： | TPS22942DCKR |
VIN
GND
OC
VOUT
Off
On
ON
5.5-V
Battery
10 F
100 kW
0.1 F
500 W
www.ti.com
SLVS832C – NOVEMBER 2008 – REVISED NOVEMBER 2009
APPLICATION INFORMATION
Figure 26. Typical Application Circuit, Active-High Enabled Device
(TPS22943, TPS22944 and TPS22945 Only)
On/Off Control
The ON pin controls the state of the switch. Activating ON continuously holds the switch in the on state as long
as there is no fault. An undervoltage on VIN or a junction temperature in excess of 150°C overrides the ON
control to turn off the switch. ON is active high and has a low threshold, making it capable of interfacing with
low-voltage signals.
Undervoltage Lockout
The undervoltage lockout turns off the switch if the input voltage (VIN) drops below the undervoltage lockout
threshold. With the ON pin active, the input voltage rising above the undervoltage lockout threshold causes a
controlled turn-on of the switch, which limits current overshoots.
Thermal Shutdown
Thermal shutdown protects the part from internally or externally generated excessive temperatures. During an
overtemperature condition the switch is turned off. The switch automatically turns on again if the temperature of
the die drops below the threshold temperature.
Reverse Voltage
If the voltage at the VOUT pin is larger than the VIN pin, large currents may flow and can cause permanent
damage to the device. TPS2294x is designed to control current flow only from VIN to VOUT.
Fault Reporting
When an overcurrent, input undervoltage, or overtemperature condition is detected, OC is set active low to signal
the fault mode. OC is an open-drain MOSFET and requires a pullup resistor between VIN and OC. During
shutdown, the pulldown on OC is disabled, reducing current draw from the supply.
Current Limiting
When the switch current reaches the maximum limit, the TPS22921/2/3/4/5 operates in a constant-current mode
to prohibit excessive currents from causing damage. TPS22921/3 has a current limit of 40 mA and TPS22922/4/5
has a current limit of 100 mA. A current limit condition immediately pulls the fault signal pin low (OC pin), and the
part remains in the constant-current mode until the switch current falls below the current limit.
Input Capacitor
To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns-on into a
discharged load capacitor or a short-circuit, a capacitor needs to be placed between VIN and GND. A 1-μF
ceramic capacitor, CIN, placed close to the pins is usually sufficient. Higher values of CIN can be used to further
reduce the voltage drop.
Copyright 2008–2009, Texas Instruments Incorporated
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS22942DCKR | 制造商:Texas Instruments 功能描述:Load Switch IC 制造商:Texas Instruments 功能描述:IC, CURRENT LIMITED LOAD SW 5.5V SC-70-5 |
| TPS22942DCKRG4 | 功能描述:电源开关 IC - 配电 Low-Inp Vltg Crnt Ltd load switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS22943DCKR | 功能描述:电源开关 IC - 配电 Lo-Inp Vltg 40mA Current Ltd Load Sw RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS22944DCKR | 功能描述:电源开关 IC - 配电 Low-Inp Vltg 40mA Current Ltd Load Sw RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS22945DCKR | 功能描述:电源开关 IC - 配电 Low-Inp Vltg Crnt Ltd load switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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