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参数资料
| 型号： | TPS70702PWP |
| 厂商： | Texas Instruments, Inc. |
| 元件分类： | 线性稳压 |
| 英文描述： | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| 中文描述： | 两用低压差最多可劈开电压DSP系统序列电源电压稳压器的输出 |
| 文件页数： | 25/34页 |
| 文件大小： | 505K |
| 代理商： | TPS70702PWP |
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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
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
programming the TPS70702 adjustable LDO regulator
The output voltage of the TPS70702 adjustable regulators is programmed using external resistor dividers as
shown in Figure 46.
Resistors R1 and R2 should be chosen for approximately 7
A divider current. Lower value resistors can be
used, but offer no inherent advantage and waste more power. Higher values should be avoided as leakage
currents at the sense terminal increase the output voltage error. The recommended design procedure is to
choose R2 = 169 k
to set the divider current at approximately 7 A and then calculate R1 using:
R1
+
V
O
V
ref
* 1
R2
Where:
Vref = 1.224 V typ (the internal reference voltage)
OUTPUT VOLTAGE
PROGRAMMING GUIDE
VO
VI
OUT
FB
R1
R2
GND
EN
IN
<0.7V
>2.0 V
TPS70702
0.1
F
+
OUTPUT
VOLTAGE
R1
R2
2.5 V
3.3 V
3.6 V
UNIT
174
287
324
169
k
k
k
Figure 46. TPS70702 Adjustable LDO Regulator Programming
regulator protection
Both TPS707xx PMOS-pass transistors have built-in back diodes that conduct reverse currents when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. When extended reverse voltage is anticipated, external limiting may be
appropriate.
The TPS707xx also features internal current limiting and thermal protection. During normal operation, the
TPS707xx regulator 1 limits output current to approximately 1.6 A (typ) and regulator 2 limits output current to
approximately 750 mA (typ). When current limiting engages, the output voltage scales back linearly until the
overcurrent condition ends. While current limiting is designed to prevent gross device failure, care should be
taken not to exceed the power dissipation ratings of the package. If the temperature of the device exceeds
150
°C(typ), thermal-protection circuitry shuts it down. Once the device has cooled below 130°C(typ), regulator
operation resumes.
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| TPS70745PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| TPS70751PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
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| TPS70802PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED SVS FOR SPLIT VOLTAGE SYSTEMS |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS70702PWPG4 | 功能描述:低压差稳压器 - LDO Dual Adj 1A/2A 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 |
| TPS70702PWPR | 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 |
| TPS70702PWPRG4 | 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 |
| TPS70745 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| TPS70745PWP | 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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