同步buck-PWM控制器2-a源线性调节器和缓冲基准CXSD62355用于DDR2 DDR3和DDR3L内存系统同步降压控制器VDDQ

目录

1.产品概述       2.产品特点     2wM嘉泰姆

3.应用范围       4.技术规格书下载（PDF文档）2wM嘉泰姆

5.产品封装       6.电路原理图  2wM嘉泰姆

7.相关产品2wM嘉泰姆

   产品概述 返回TOP2wM嘉泰姆

The CXSD62355 is intended for DDR2, DDR3 and DDR3L memory systems. It integrates a synchronous buck PWM controller with a 2-A sink-source linear regulator and buffered reference. The PWM controller uses constant on-time control scheme to handle wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The CXSD62355 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by an ability to drive very large synchronous rectifier MOSFETs. Single-stage buck conversion allows these devices to directly step down high-voltage batteries for the highest possible efficiency. The 2A sink/source tracking termination regulator is specifically designed for low-cost/ low-external component count systems. The regulator contains a high speed operational amplifier that provides fast load transient response with only 10μF of ceramic output capacitance. The CXSD62355 supports remote sensing functions and all features required to power the DDR2 /DDR3 /DDR3L VTT bus termination according to the JEDEC specification. In addition, the CXSD62355 includes integrated sleep-state controls placing VTT in High-Z in S3 (suspend to RAM) and soft-off for VTT and VTTREF in S4/S5 (Shutdown). The CXSD62355 provides OVP, UVP, over current and thermal shutdown protection functions and is available in a 20-pin 3X3 TQFN package.

   产品特点 返回TOP2wM嘉泰姆

•Synchronous Buck Controller (VDDQ) 2wM嘉泰姆

„ Ultra-High Efficiency at Light and Heavy Load with Auto-skip Function „ No Current-Sense Resistor (Lossless ILIMIT) 2wM嘉泰姆

„ Quasi-PWM with 100ns Load-Step Response 2wM嘉泰姆

„ 0.7V to 1.8V Adjustable Output Range 2wM嘉泰姆

„ 3V to 28V Battery Input Range 2wM嘉泰姆

„ 0.8% Vref Accuracy 2wM嘉泰姆

„ Supports Soft-off in S4/S5 States2wM嘉泰姆

„ Selectable 300k/400kHz Switching Frequency 2wM嘉泰姆

„ OVP & UVP of VDDQ Output 2wM嘉泰姆

„ Drives Large Synchronous-Rectifier FETs 2wM嘉泰姆

„ Power-Good Indicator 2wM嘉泰姆

•2-A LDO (VTT), Buffered Reference (VTTREF) 2wM嘉泰姆

„ VLDOIN Voltage Range: 1.2 V to 3.6 V 2wM嘉泰姆

„ Requires Only 10μF Ceramic VTT Output Capacitance 2wM嘉泰姆

„ Supports High-Z in S3 and Soft-Off in S4/S52wM嘉泰姆

„ Integrated Divider Tracks 1/2 VDDQSNS for Both VTT and VTTREF 2wM嘉泰姆

„ Remote Sensing (VTTSNS) 2wM嘉泰姆

„ ±20mV VTT and 0.8% VTTREF Accuracy 2wM嘉泰姆

„ 10mA Buffered Reference (VTTREF) 2wM嘉泰姆

„ Built-In Soft-Start to Reduce the VLDOIN Surging Current 2wM嘉泰姆

„ Over Current Protection of VTT Output 2wM嘉泰姆

„ Thermal Shutdown Protection2wM嘉泰姆

   应用范围 返回TOP2wM嘉泰姆

„ Notebook Computers 2wM嘉泰姆

„ CPU Core Supply 2wM嘉泰姆

„ Chipset/RAM Supply as Low as 0.7V2wM嘉泰姆

   技术规格书（产品PDF) 返回TOP 2wM嘉泰姆

     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！2wM嘉泰姆

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产品封装图 返回TOP2wM嘉泰姆

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电路原理图 返回TOP2wM嘉泰姆

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