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参数资料
| 型号： | TPS2223DB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封装： | GREEN, PLASTIC, SSOP-24 |
| 文件页数： | 14/33页 |
| 文件大小： | 814K |
| 代理商： | TPS2223DB |
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TPS2223, TPS2224, TPS2226
DUALSLOT CARDBUS POWERINTERFACE SWITCHES
FOR SERIAL PCMCIA CONTROLLERS
SLVS317 MAY 2001
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown mode
In the shutdown mode, which can be controlled by SHDN or bit D8 of the input serial DATA word, each of the
xVCC and xVPP outputs is forced to a high-impedance state. In this mode, the chip quiescent current is reduced
to 1
A or less to conserve battery power.
power-supply considerations
These switches have multiple pins for each 3.3-V and 5-V power input and for the switched xVCC outputs. Any
individual pin can conduct the rated input or output current. Unless all pins are connected in parallel, the series
resistance is higher than that specified, resulting in increased voltage drops and power loss. It is recommended
that all input and output power pins be paralleled for optimum operation.
To increase the noise immunity of the TPS2223, TPS2224 and TPS2226, the power-supply inputs should be
bypassed with at least a 4.7
F electrolytic or tantalum capacitor paralleled by a 0.047-F to 0.1-F ceramic
capacitor. It is strongly recommended that the switched outputs be bypassed with a 0.1-
F (or larger) ceramic
capacitor; doing so improves the immunity of the IC to electrostatic discharge (ESD). Care should be taken to
minimize the inductance of PCB traces between the devices and the load. High switching currents can produce
large negative voltage transients, which forward biases substrate diodes, resulting in unpredictable
performance. Similarly, no pin should be taken below 0.3 V.
RESET input
To ensure that cards are in a known state after power brownouts or system initialization, the PC Cards should
be reset at the same time as the host by applying low-impedance paths from xVCC and xVPP terminals to
ground. A low-impedance output state allows discharging of residual voltage remaining on PC Card filter
capacitance, permitting the system (host and PC Cards) to be powered up concurrently. The active low RESET
input will close internal switches S1, S4, S7, and S11 with all other switches left open. The TPS2223, TPS2224
and TPS2226 remain in the low-impedance output state until the signal is deasserted and further data is clocked
in and latched. The input serial data cannot be latched during reset mode. RESET is provided for direct
compatibility with systems that use an active-low reset voltage supervisor. The RESET pin has an internal
150-k
pullup resistor.
calculating junction temperature
The switch resistance, rDS(on), is dependent on the junction temperature, TJ, of the die. The junction temperature
is dependent on both rDS(on) and the current through the switch. To calculate TJ, first find rDS(on) from Figures 26
through 28, using an initial temperature estimate about 30
°C above ambient. Then calculate the power
dissipation for each switch, using the formula:
P
D +
r
DS(on)
I2
Next, sum the power dissipation of all switches and calculate the junction temperature:
T
J +
P
D
RqJA ) TA
Where:
RθJA is the inverse of the derating factor given in the dissipation rating table.
Compare the calculated junction temperature with the initial temperature estimate. If the temperatures are not
within a few degrees of each other, recalculate using the calculated temperature as the initial estimate.
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| TPS2223DBG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2223DBR | 功能描述:热插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2223DBRG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2223PWP | 功能描述:热插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2223PWPG4 | 功能描述:热插拔功率分布 1A Dual-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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