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參數(shù)資料
| 型號： | TPS70745PWP |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 線性穩(wěn)壓 |
| 英文描述： | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| 中文描述： | 兩用低壓差最多可劈開電壓DSP系統(tǒng)序列電源電壓穩(wěn)壓器的輸出 |
| 文件頁數(shù)： | 21/34頁 |
| 文件大?。?/td> | 505K |
| 代理商： | TPS70745PWP |
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TPS70745, TPS70748, TPS70751, TPS70758, TPS70702
DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS
WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS
SLVS291 – MAY 2000
28
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor
For a typical application, an input bypass capacitor (0.1
F – 1 F) is recommended. This capacitor will filter
any high frequency noise generated in the line. For fast transient condition where droop at the input of the LDO
may occur due to high inrush current, it is recommended to place a larger capacitor at the input as well. The
size of this capacitor is dependant on the output current and response time of the main power supply, as well
as the distance to the VI pins of the LDO.
output capacitor
As with most LDO regulators, the TPS707xx requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance values are 10
F ceramic
capacitors with an ESR (equivalent series resistance) between 50 m
and 2.5 or 6.8 F tantalum capacitors
with ESR between 250 m
and 4 . Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic
capacitors with capacitance values greater than 10
F are all suitable, provided they meet the requirements
described above. Larger capacitors provide a wider range of stability and better load transient response. Below
is a partial listing of surface-mount capacitors usable with the TPS707xx. for fast transient response application.
This information, along with the ESR graphs, is included to assist in selection of suitable capacitance for the
user’s application. When necessary to achieve low height requirements along with high output current and/or
high load capacitance, several higher ESR capacitors can be used in parallel to meet the guidelines above.
VALUE
MFR.
MAX ESR
PART NO.
22
F
Kemet
345 m
7495C226K0010AS
33
F
Sanyo
100 m
10TPA33M
47
F
Sanyo
100 m
6TPA47M
68
F
Sanyo
45 m
10TPC68M
ESR and transient response
LDOs typically require an external output capacitor for stability. In fast transient response applications,
capacitors are used to support the load current while LDO amplifier is responding. In most applications, one
capacitor is used to support both functions.
Besides its capacitance, every capacitor also contains parasitic impedances. These parasitic impedances are
resistive as well as inductive. The resistive impedance is called equivalent series resistance (ESR), and the
inductive impedance is called equivalent series inductance (ESL). The equivalent schematic diagram of any
capacitor can therefore be drawn as shown in Figure 43.
RESR
LESL
C
Figure 43. – ESR and ESL
In most cases one can neglect the effect of inductive impedance ESL. Therefore, the following application
focuses mainly on the parasitic resistance ESR.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS70745PWPG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Dual-Output LDO Vltg Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS70745PWPR | 功能描述:低壓差穩(wěn)壓器 - LDO Dual-Output LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS70745PWPRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Dual-Output LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS70748 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| TPS70748PWP | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V/1.2V 250/125mA RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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