3 说明
TPS7A47 是一款正电压 (+36V) 超低噪声 (4µVRMS) 低压降线性稳压器 (LDO) 系列产品,能够提供 1A 负载。
用户可通过印刷电路板 (PCB) 布局布线来编程设定 TPS7A4700 输出电压(最高 20.5V),无需外部电阻器或前馈电容器,从而减少了元件总数量。
配置 TPS7A4701 输出电压时,用户可通过 PCB 布局编程设定(高达 20.5V)或使用外部反馈电阻器调节(高达 34V)。
TPS7A47 由双极型技术设计而成,主要用于高准确度、高精度仪器仪表应用。在此类应用中,规整的电压轨对于系统性能的最大化至关重要。 这种设计使其成为功率运算放大器,模数转换器(ADC),数模转换器 (DAC) 及其它关键应用(诸如医疗、射频 (RF) 和测试测量应用)中高性能模拟电路的最佳选择。
此外,TPS7A47 线性稳压器也非常适合于后置 DC/DC 转换器稳压。 通过滤除 dc/dc 开关转换所固有的输出电压纹波,可确保在灵敏仪器仪表、测试和测量、音频和 RF 应用中将系统性能最大化。
对于需要正向和负向低噪声电源轨的应用,请考虑 TI 的TPS7A33负向高电压、超低噪声线性稳压器系列产品。
部件号 |
封装 |
封装尺寸(标称值) |
TPS7A470x |
VQFN (20) |
5mm x 5mm |
- 如需了解所有可用封装,请见数据表末尾的可订购产品附录。
4 修订历史记录
Changes from E Revision (January 2014) to F Revision
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Added 处理额定值表、特性描述部分、器件功能模式、应用和实施部分、电源相关建议部分、布局部分、器件和文档支持部分以及机械、封装和可订购信息部分Go
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重新编写了特性列表中的第九个要点Go
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Changed polarity of op amp shown on right side of the functional block diagram Go
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Reworded second paragraph in Soft-Start And Inrush Current section Go
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Revised Capacitor Recommendations sectionGo
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Changed paragraph 2 of Dropout Voltage (VDO) section for clarity Go
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Revised paragraph 1 of Startup section Go
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Rewrote paragraph 1 of Power-Supply Rejection Ratio (PSRR) section to eliminate confusion Go
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Changed paragraph 1 of Power Supply Recommendations section Go
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Changed paragraph 1 and paragraph 4 of Power Dissipation (PD) sectionGo
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Revised paragraph 2 of Layout Guidelines section Go
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Changed second paragraph of Thermal Protection section Go
Changes from D Revision (December 2013) to E Revision
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标题页的三个实例中输出电压噪声值从 4.17µV 改为 4µVGo
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更改了说明部分中的第二段和第三段Go
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Added "Thermal Pad" to pin configuration drawingGo
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Changed EN pin descriptionGo
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Changed SENSE/FB pin to be for TPS7A4701 onlyGo
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Added new row to Pin Descriptions table for SENSE pin (for TPS7A4700 only)Go
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Added new row to Pin Descriptions table for thermal padGo
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Added VREF parameterGo
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Added TPS7A4701 device to test conditions for VNR parameterGo
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Added Feedback Pin Current parameter to Electrical Characteristics Go
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Deleted Dropout Voltage vs Output Current graphGo
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Added EN pin to Functional Block DiagramGo
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Added sentence to ANY-OUT Programmable Output Voltage section to clarify ANY-OUT is for both devicesGo
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Changed last two paragraphs of Adjustable Operation sectionGo
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Added "TPS7A4701 Only" to Adjustable Operation section titleGo
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Deleted equation in Figure 23Go
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Changed Equation 3Go
Changes from C Revision (July 2013) to D Revision
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将数据表状态从生产结构更改为生产数据Go
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已将 TPS7A4701 静电放电 (ESD) 额定值从 > 1kV 更改为 2.5kVGo
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Changed noise reduction pin voltage parameter to show both devicesGo
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Added text clarifying VREF typical value to last paragraph on pageGo
Changes from B Revision (April 2013) to C Revision
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从数据表中删除了 TPS7A4702 预览器件Go
Changes from A Revision (July 2012) to B Revision
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已将 TPS7A47 改为 TPS7A4700Go
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已将 TPS7A4701 和 TPS7A4702 预览器件添加到数据表中Go
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更改了标题页图表Go
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Added FB to SENSE pin to Functional Block DiagramGo
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Added new paragraph after Table 1Go
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Added new Table 2Go
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Added Adjustable Operation sectionGo
Changes from * Revision (June 2012) to A Revision