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参数资料
| 型号： | TPS70845PWP |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 线性稳压 |
| 英文描述： | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS |
| 中文描述： | 两用低压差电压带的劈开SVS的系统集成稳压器的输出电压 |
| 文件页数： | 16/29页 |
| 文件大小： | 449K |
| 代理商： | TPS70845PWP |
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TPS70845, TPS70848, TPS70851, TPS70858, TPS70802
DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS
WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS
SLVS301B – JUNE 2000 – REVISED OCTOBER 2002
23
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 TPS708xx 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 TPS708xx 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
Kermet
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 37.
RESR
LESL
C
Figure 37. 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS70845PWPG4 | 功能描述:低压差稳压器 - LDO Dual-Output LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS70845PWPR | 功能描述:低压差稳压器 - LDO Dual-Output LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS70845PWPRG4 | 功能描述:低压差稳压器 - LDO Dual-Output LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TPS70848 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS |
| TPS70848PWP | 功能描述:低压差稳压器 - LDO 3.3V/1.2V 250/125mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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