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參數(shù)資料
| 型號： | TPS2210APWPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 13/37頁 |
| 文件大?。?/td> | 1004K |
| 代理商： | TPS2210APWPG4 |
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TPS2204A
TPS2206A
TPS2210A
SLVS449A DECEMBER 2002 REVISED MAY 2003
www.ti.com
20
OVERCURRENT AND OVERTEMPERATURE PROTECTION
PC Cards are inherently subject to damage that can result from mishandling. Host systems require protection against
short-circuited cards that could lead to power-supply or PCB trace damage. Even extremely robust systems could undergo
rapid battery discharge into a damaged PC Card, resulting in the rather sudden and unacceptable loss of system power.
The reliability of fused systems is poor, in comparison, as blown fuses require troubleshooting and repair, usually by the
manufacturer.
The TPS2204A, TPS2206A, and TPS2210A take a two-pronged approach to overcurrent protection. Overcurrent
protection 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 xVCC and xVPP power outputs. Unlike sense resistors
or polyfuses, these FETs do not add to the series resistance of the switch; therefore voltage and power losses are reduced.
Overcurrent sensing is applied to each output separately. Excessive current generates an error signal that limits the output
current of only the affected output, preventing damage to the host. Each xVCC output overcurrent limits from 1 A to 2.2
A, typically around 1.6 A; the xVPP outputs limit from 100 mA to 250 mA, typically around 200 mA.
Second, when an overcurrent condition is detected, the device asserts an active low OC signal that can be monitored by
the microprocessor or controller to initiate diagnostics and/or send the user a warning message. If an overcurrent condition
persists, causing the IC to exceed its maximum junction temperature, thermal-protection circuitry activates, shutting down
all power outputs until the device cools to within a safe operating region, which is ensured by a thermal shutdown hysteresis.
Thermal limiting prevents destruction of the IC from overheating beyond the package power-dissipation ratings.
During power up, the devices control the rise times of the xVCC and xVPP outputs and limit the inrush current into a large
load capacitance, faulty card, or connector.
12-V SUPPLY NOT REQUIRED
Some PC Card switches use the externally supplied 12 V to power gate drive and other chip functions, which requires that
power be present at all times. The TPS2204A, TPS2206A, and TPS2210A offer considerable power savings by using an
internal charge pump to generate the required higher gate drive voltages from the 3.3-V input. Therefore, the external 12-V
supply can be disabled except when needed by the PC Card in the slot, thereby extending battery lifetime. A special feature
in the 12-V circuitry actually helps to reduce the supply current demanded from the 3.3-V input. When 12 V is supplied and
requested at the Vpp output, a voltage selection circuit draws the charge-pump drive current for the 12-V FETs from the
12-V input. This selection is automatic and effectively reduces demand fluctuations on the normal 3.3-V VCC rail. For proper
operation of this feature, a minimum 3.3-V input capacitance of 4.7
F is recommended, and a minimum 12-V input ramp-up
rate of 12 V/50 ms (240 V/s) is required. Additional power savings are realized during a software shutdown in which
quiescent current drops to a maximum of 1
A.
BACKWARD COMPATIBILITY
The TPS2206A is backward compatible with the TPS2206 product, with the following considerations. An active low /SHDN
is added to provide fast shutdown capability. Also, the TPS2206A does not have the activehigh RESET input, which is left
as no connect.
3.3–V input is required for device operation of TPS2206A.
VOLTAGE-TRANSITIONING REQUIREMENT
PC Cards, like portables, are migrating from 5 V to 3.3 V to minimize power consumption, optimize board space, and
increase logic speeds. The TPS2204A, TPS2206A, and TPS2210A meet all combinations of power delivery as currently
defined in the PCMCIA standard. The latest protocol accommodates mixed 3.3-V/5-V systems by first powering the card
with 5 V, then polling it to determine its 3.3-V compatibility. The PCMCIA specification requires that the capacitors on
3.3-V-compatible cards be discharged to below 0.8 V before applying 3.3-V power. This action ensures that sensitive 3.3-V
circuitry is not subjected to any residual 5-V charge and functions as a power RESET. PC Card specification requires that
VCC be discharged within 100 ms. PC Card resistance cannot be relied on to provide a discharge path for voltages stored
on PC Card capacitance because of possible high-impedance isolation by power-management schemes. The devices
include discharge transistors on all xVCC and xVPP outputs to meet the specification requirement.
相關PDF資料 |
PDF描述 |
|---|---|
| TPS2206ADAP | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO32 |
| TPS2206ADBR | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| TPS2210APWP | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| TPS2206ADBRG4 | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO30 |
| TPS2204APWPG4 | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2210APWPR | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2210APWPRG4 | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card w/Serial Interface RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2211AIDB | 功能描述:熱插拔功率分布 PCMCIA Pwr Intfce Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2211AIDBG4 | 功能描述:熱插拔功率分布 PCMCIA Pwr Intfce Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2211AIDBR | 功能描述:熱插拔功率分布 PCMCIA Pwr Intfce Sw RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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