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参数资料
| 型号： | TPS2220BDBG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封装： | GREEN, PLASTIC, SSOP-24 |
| 文件页数： | 11/31页 |
| 文件大小： | 774K |
| 代理商： | TPS2220BDBG4 |
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www.ti.com
APPLICATION INFORMATION
OVERVIEW
PC CARD POWER SPECIFICATION
DESIGNING FOR VOLTAGE REGULATION
V
DS +
V
O(reg)
–V
PS(reg)
–V
PCB
I
O
max +
V
DS
r
DS(on)
OVERCURRENT AND OVERTEMPERATURE PROTECTION
TPS2220B
SLVS554 – JANUARY 2005
PC Cards were initially introduced as a means to add flash memory to portable computers. The idea of add-in
cards quickly took hold, and modems, wireless LANs, global positioning satellite system (GPS), multimedia, and
hard-disk versions were soon available. As the number of PC Card applications grew, the engineering
community quickly recognized the need for a standard to ensure compatibility across platforms. Therefore, the
PCMCIA (Personal Computer Memory Card International Association) was established, comprising members
from leading computer, software, PC Card, and semiconductor manufacturers. One key goal was to realize the
plug-and-play concept, so that cards and hosts from different vendors would be transparently compatible.
System compatibility also means power compatibility. The most current set of specifications (PC Card Standard)
set forth by the PCMCIA committee states that power is to be transferred between the host and the card through
eight of the 68 terminals of the PC Card connector. This power interface consists of two VCC, two Vpp, and four
ground terminals. Multiple VCC and ground terminals minimize connector-terminal and line resistance. The two
Vpp terminals were originally specified as separate signals, but are normally tied together in the host to form a
single node to minimize voltage losses. Card primary power is supplied through the VCC terminals; flash-memory
programming and erase voltage is supplied through the Vpp terminals. Cardbus cards of today typically do not
use 12 V, which is now more of an optional requirement in the host.
The current PCMCIA specification for output voltage regulation, VO(reg), of the 5-V output is 5% (250 mV). In a
typical PC power-system design, the power supply has an output-voltage regulation, VPS(reg), of 2% (100 mV).
Also, a voltage drop from the power supply to the PC Card results from resistive losses, VPCB, in the PCB traces
and the PCMCIA connector. A typical design would limit the total of these resistive losses to less than 1% (50
mV) of the output voltage. Therefore, the allowable voltage drop, VDS, for the TPS2220B would be the PCMCIA
voltage regulation less the power supply regulation and less the PCB and connector resistive drops:
Typically, this would leave 100 mV for the allowable voltage drop across the 5-V switch. The specification for
output voltage regulation of the 3.3-V output is 300 mV; therefore, using the same equation by deducting the
voltage drop percentages (2%) for power-supply regulation and PCB resistive loss (1%), the allowable voltage
drop for the 3.3-V switch is 200 mV. The voltage drop is the output current multiplied by the switch resistance of
the device. Therefore, the maximum output current, IO max, that can be delivered to the PC Card in regulation is
the allowable voltage drop across the IC, divided by the output-switch resistance.
The AVCC outputs have been designed to deliver the peak and average currents defined by the PC Card
specification within regulation over the operating temperature range. The AVPP outputs of the device have been
designed to deliver 100 mA continuously.
PC Cards are inherently subject to damage that can result from mishandling. Host systems require protection
against short-circuited cards that can lead to power-supply or PCB trace damage. Even extremely robust
systems can undergo rapid battery discharge into a damaged PC Card, resulting in the sudden and unacceptable
loss of system power. In comparison, the reliability of fused systems is poor because blown fuses require
troubleshooting and repair, usually by the manufacturer.
The TPS2220B takes a two-pronged approach to overcurrent protection, which is designed to activate if an
output is shorted or when an overcurrent condition is present when switches are powered up. First, instead of
fuses, sense FETs monitor each of the AVCC and AVPP power outputs. Unlike sense resistors or polyfuses,
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| TPS2220BDBR | 功能描述:热插拔功率分布 Single PC Card Ser Intfc Pwr 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 |
| TPS2220BDBRG4 | 功能描述:热插拔功率分布 Single PC Card Ser Intfc Pwr 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 |
| TPS2220BPWP | 功能描述:热插拔功率分布 Single PC Card Ser Intfc Pwr 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 |
| TPS2220BPWPG4 | 功能描述:热插拔功率分布 Single PC Card Ser Intfc Pwr 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 |
| TPS2220BPWPR | 功能描述:热插拔功率分布 Single PC Card Ser Intfc Pwr 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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