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參數(shù)資料
| 型號： | TPS2220BPWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數(shù)： | 14/31頁 |
| 文件大?。?/td> | 774K |
| 代理商： | TPS2220BPWPRG4 |
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www.ti.com
RESET INPUT
CALCULATING JUNCTION TEMPERATURE
P
D +
r
DS(on)
I2
T
J +
P
D
R
q
JA )
T
A
where:
RθJA is the inverse of the derating factor given in the dissipation rating table.
LOGIC INPUTS AND OUTPUTS
TPS2220B
SLVS554 – JANUARY 2005
APPLICATION INFORMATION (continued)
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.
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 AVCC and AVPP 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 closes
internal ground switches S1, S4, S7, and S11 with all other switches left open. The TPS2220B remains 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.
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 Figure 26
through Figure 28, using an initial temperature estimate about 30°C above ambient. Then, calculate the power
dissipation for each switch, using the formula:
Next, sum the power dissipation of all switches and calculate the junction temperature:
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.
The serial interface consists of the DATA, CLOCK, and LATCH leads. The data is clocked in on the positive
edge of the clock (see Figure 2). The 11-bit (D0-D10) serial data word is loaded during the positive edge of the
latch signal. The positive edge of the latch signal should occur before the next positive edge of the clock occurs.
The serial interface of the device is compatible with serial-interface PCMCIA controllers.
An overcurrent output (OC) is provided to indicate an overcurrent or overtemperature condition in any of the
AVCC and AVPP outputs as previously discussed.
21
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2221PWP | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS2221PWPG4 | 功能描述:熱插拔功率分布 1A Sgl-Slot CardBay PC Card Pwr Sw RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS2221PWPR | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS2221PWPRG4 | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch RoHS:否 制造商:Texas Instruments 產品: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 |
| TPS22226ADBR | 制造商:Texas Instruments 功能描述: |
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