TPS51216中文资料DDR2/3/3L/4 存储器电源解决方案同步降压控制器、2A LDO、缓冲基准数据手册TI规格书

描述 Description

The TPS51216 provides a complete power supply for DDR2, DDR3 and DDR3L memory systems in the lowest total cost and minimum space. It integrates a synchronous buck regulator controller (VDDQ) with a 2-A sink/source tracking LDO (VTT) and buffered low noise reference (VTTREF). The TPS51216 employs D-CAP™ mode coupled with 300 kHz/400 kHz frequencies for ease-of-use and fast transient response. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2-A sink/source peak current capabilities, requires only 10-μF of ceramic capacitance. In addition, a dedicated LDO supply input is available. The TPS51216 provides rich useful functions as well as excellent power supply performance. It supports flexible power state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4/S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP/UVP/UVLO and thermal shutdown protections are also available.The TPS51216 is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified for ambient temperature from –40°C to 85°C.

特性 Features

• Synchronous Buck Controller (VDDQ)
• Conversion Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.7 V to 1.8 V
• 0.8% VREF Accuracy
• D-CAP™ Mode for Fast Transient Response
• Selectable 300 kHz/400 kHz Switching Frequencies
• Optimized Efficiency at Light and Heavy Loads with Auto-skip Function
• Supports Soft-Off in S4/S5 States
• OCL/OVP/UVP/UVLO Protections
• Powergood Output

• 2-A LDO(VTT), Buffered Reference(VTTREF)
• 2-A (Peak) Sink and Source Current
• Requires Only 10-μF of Ceramic Output Capacitance
• Buffered, Low Noise, 10-mA VTTREF Output
• 0.8% VTTREF, 20-mV VTT Accuracy
• Support High-Z in S3 and Soft-Off in S4/S5

• Thermal Shutdown
• 20-Pin, 3 mm × 3 mm, QFN Package
• APPLICATIONS
• DDR2/DDR3/DDR3L Memory Power Supplies
• SSTL_18, SSTL_15, SSTL_135 and HSTL Termination