[原创] TI TPS7H3301－SP耐辐射DDR端电源解决方案

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[原创] TI TPS7H3301－SP耐辐射DDR端电源解决方案

关键词：电源管理 DC／DC转换器 DDR3存储器
时间：2016-07-22 09:42:59       作者：TI       来源：中电网

TI公司的TPS7H3301-SP是内置了VTTREF缓冲器的TID和SEE耐辐射(65 MeV-cm[sup]2[/sup]/mg)双数据速率(DDR) 3A电源稳压器,和DDR,DDR2.DDR3,DDR4和低功耗JEDEC标准兼容,输出电压0.5V到1.75V,3A沉和源电流,精度±20-mV,主要用在如单板计算机,固态记录仪和有效载荷处理中的DDR端应用.本文介绍了TPS7H3301-SP主要特性,功能框图,典型应用电路以及TPS7H3301-SP评估板(EVM)主要特性,框图,电路图和材料清单.

The TPS7H3301-SP is a TID and SEE radiation-hardened double data rate (DDR) 3-A termination regulator with built-in VTTREF buffer. The regulator is specifically design to provide a complete, compact, low-noise solution for space DDR termination applications such as single board computers, solid state recorders, and payload processing.

The TPS7H3301-SP supports and is compliant to DDR, DDR2, DDR3, DDR4, and associated low-power JEDEC specifications. The fast transient response of the TPS7H3301-SP VTT regulator allows for a very stable supply during read/write conditions. During transients, the fast tracking feature of the VTTREF supply minimizes any voltage offset between VTT and VTTREF. To enable simple power sequencing, both an enable input and a power-good output (PGOOD) have been integrated into the TPS7H3301-SP. The PGOOD output is open-drain so it can be tied to multiple open-drain outputs to monitor when all supplies have come into regulation. The enable signal can also be used to discharge VTT during suspend to RAM (S3) power down mode.

TPS7H3301-SP主要特性:

5962R14288:
Radiation Hardness Assurance (RHA) Qualified to Total Ionizing Dose (TID) 100 krad(Si)
Single Event Latch-Up (SEL), Single Event Gate Rupture (SEGR), Single Event Burnout (SEB) Immune to LET = 65 MeV-cm[sup]2[/sup]/mg
SET, SEFI, SEU Immune to 65 MeV-cm[sup]2[/sup]/mg
Supports DDR, DDR2, DDR3, DDR3LP, and DDR4 Termination Applications and is Compliant to JEDEC Standards
Input Voltage: Supports a 2.5-V and 3.3-V Rail
Separate Low-Voltage Input (VLDOIN) Down to .9 V for Improved Power Efficiency[sup](2)[/sup]
3-A Sink and Source Termination Regulator Includes Droop Compensation
Enable Input and Power-Good Output for Power Supply Sequencing
VTT Termination Regulator
Output Voltage Range: 0.5 to 1.75 V
3-A Sink and Source Current
±20-mV Accuracy
Integrated Precision Voltage Divider Network With Sense Input
Remote Sensing (VOSNS)
VTTREF Buffered Reference
VDDQ/2 ±1% Accuracy
±10-mA Sink and Source Current
Undervoltage Lockout (UVLO), and Overcurrent Limit (OCL) Functionality Integrated

                               
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图1.TPS7H3301-SP功能框图

                               
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图2.TPS7H3301-SP典型应用电路图:2.5V VIN DDR3配置

TPS7H3301-SP评估板

TPS7H3301-SP source/sink Double Data Rate (DDR) termination regulator designed to support system needs for low noise applications.

Integrated solution with reduced system solution size, improved efficiency, and simple system design integration.

                               
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图3.TPS7H3301-SP评估板(EVM)外形图

TPS7H3301-SP评估板(EVM)主要特性:

• Input Voltage: Supports 2.5-V rail and 3.3-V rail
• VLDOIN, VDDQ voltage range: 0.9 V–3.5 V
• Build-in transient load switches (with both sinking and sourcing capability) to emulate the sink/sourcetransient behavior which helps to evaluate the dynamic performance. For ease of use, both load stepand transient timing can be modified by on-board resistors. Current information can also be monitoredonboard:
– DDR: 1.67 A sink/source transient load
– DDR2: 1.2 A sink/source transient load
– DDR3: 1.0 A sink/source transient load
– DDR4: 0.8 A sink/source transient load
• Jumper J22 (pins 1 and 2) for enable function
• Convenient test points for probing PGOOD, CLK_IN, and loop response testing
• 4-layer PCB with flexibility to use test socket as well as solder down IC.

TPS7H3301-SP评估板(EVM)典型应用:

• Radiation-tolerant DDR power applications
• Memory termination regulator for DDR, DDR2, DDR3, DDR4

                               
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图4.TPS7H3301-SP评估板(EVM)框图

                               
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图5.TPS7H3301-SP评估板(EVM)电路图(1)

                               
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图6.TPS7H3301-SP评估板(EVM)瞬板电路图
TPS7H3301-SP评估板(EVM)材料清单(BOM):

                               
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详情请见:
http://www.ti.com/lit/ds/symlink/tps7h3301-sp.pdf
和http://www.ti.com/lit/ug/slvuak2/slvuak2.pdf

                               
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slvuak2.pdf

                               
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tps7h3301-sp.pdf