CXSD62355该PWM控制器采用恒导通控制方案，能够轻松地处理宽的输入/输出电压比，在保持相对恒定的开关频率的同时，对负载瞬态提供100ns的“瞬时通”响应。CXSD62355通过消除传统电流模式PWMs中的电流感应电阻，以较低的成本实现了高效率。驱动超大同步整流mosfet的能力进一步提高了效率。单级降压转换允许这些设备直接降压高压电池，以获得尽可能高的效率。
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目录
7.相关产品
产品概述 返回TOP
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TOP
•Synchronous Buck Controller (VDDQ)
„ Ultra-High Efficiency at Light and Heavy Load with Auto-skip Function „ No Current-Sense Resistor (Lossless ILIMIT)
„ Quasi-PWM with 100ns Load-Step Response
„ 0.7V to 1.8V Adjustable Output Range
„ 3V to 28V Battery Input Range
„ 0.8% Vref Accuracy
„ Supports Soft-off in S4/S5 States
„ Selectable 300k/400kHz Switching Frequency
„ OVP & UVP of VDDQ Output
„ Drives Large Synchronous-Rectifier FETs
„ Power-Good Indicator
•2-A LDO (VTT), Buffered Reference (VTTREF)
„ VLDOIN Voltage Range: 1.2 V to 3.6 V
„ Requires Only 10μF Ceramic VTT Output Capacitance
„ Supports High-Z in S3 and Soft-Off in S4/S5
„ Integrated Divider Tracks 1/2 VDDQSNS for Both VTT and VTTREF
„ Remote Sensing (VTTSNS)
„ ±20mV VTT and 0.8% VTTREF Accuracy
„ 10mA Buffered Reference (VTTREF)
„ Built-In Soft-Start to Reduce the VLDOIN Surging Current
„ Over Current Protection of VTT Output
„ Thermal Shutdown Protection
应用范围 返回TOP
„ Notebook Computers
„ CPU Core Supply
„ Chipset/RAM Supply as Low as 0.7V
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
电路原理图 返回TOP
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Synchronous (Quasi-PWM) Step Down Controller |
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Part NO. |
Vin(V) min. |
Vin(V) max. |
VOUT (V) |
FSW (k Hz) |
FB (V) |
Note |
Package |
|
3 |
28 |
0.7~1.8 |
300/400 |
0.8 |
EN, SS, PGOOD, OVP, UVP, OCP, VTTREF, Built-in BST diode, DDR1/2/3/3L, 2A LDO for VTT |
TQFN3X3-20 |
|
|
4.5 |
28 |
0.7~2.6 |
ADJ |
0.7 |
EN, PGOOD, OVP, UVP, OCP, VOUT Adjustable,1.5ms VOUT Servo Soft Start, 4700ppm/°C RON Coefficient |
TDFN3X3-10 |
|
|
4.5 |
28 |
0.5~3.3 |
ADJ |
0.5 |
EN, PGOOD, OVP, UVP, OCP, VOUT Adjustable, 1.5ms VOUT Servo Soft Start, 4700ppm/°C RON Coefficient |
TQFN2X2-12 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, Built-in BST diode |
TQFN3X3-16/TQFN3.5X3.5-14 |
|
|
2 |
24 |
0.75~3.6 |
400/ADJ |
0.75 |
EN, SS, PGOOD, OVP, UVP, OCP, VTTREF, Built-in BST diode, DDR1/2/3/3L, 3A/2A LDO for VTT |
TQFN4X4-24/TQFN3X3-20 |
|
|
4.5 |
24 |
0.75~3.6 |
ADJ |
0.75 |
EN, PGOOD, OVP, UVP, OCP, Built-in BST diode, SS, G0 & G1 Controls VOUT |
TQFN3X3-16 |
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