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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： | 6/19页 |
| 文件大小： | 537K |
| 代理商： | TPS22942DCKR |
SLVS832C – NOVEMBER 2008 – REVISED NOVEMBER 2009
www.ti.com
Output Capacitor
A 0.1-
μF capacitor, COUT, should be placed between VOUT and GND. This capacitor will prevent parasitic board
inductances from forcing VOUT below GND when the switch turns off. For the TPS2294x, the total output
capacitance needs to be kept below a maximum value, COUT(max), to prevent the part from registering an
over-current condition and turning-off the switch. The maximum output capacitance can be determined from the
following formula, COUT = ILIM(MAX) x tBLANK(MIN) ÷ VIN
Due to the integral body diode in the PMOS switch, a CIN greater than COUT is highly recommended. A COUT
greater than CIN can cause VOUT to exceed VIN when the system supply is removed. This could result in current
flow through the body diode from VOUT to VIN.
Power Dissipation
During normal operation as a switch, the power dissipation is small and has little effect on the operating
temperature of the part. The parts with the higher current limits will dissipate the most power and that will only
be,
P = (ILIM)
2 × r
ON = (0.2)
2 × 0.4 = 16 mW when V
IN= 5.5 V
If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground.
For TPS22941/2/5, the power dissipation scales by the auto-restart time (tRESTART) and the overcurrent blanking
time (tBLANK) so that the maximum power dissipated is:
P(max) = (tBLANK ÷ (tRESTART + tBLANK)) × (VIN(max)) × ILIM(max) = (10 ÷ (80 + 10) × 5.5 × 0.2 = 122 mW
When using the TPS22943 and TPS22944, a short on the output causes the part to operate in a constant current
state, dissipating a worst-case power as calculated above until the thermal shutdown activates. It then cycles in
and out of thermal shutdown so long as the ON pin is active and the short is present.
Board Layout
For best performance, all traces should be as short as possible. To be most effective, the input and output
capacitors should be placed close to the device to minimize the effects that parasitic trace inductances may have
on normal and short-circuit operation. Using wide traces for VIN, VOUT, and GND will help minimize parasitic
electrical effects along with minimizing the case to ambient thermal impedance.
14
Copyright 2008–2009, Texas Instruments Incorporated
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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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