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首页 > 产品中心 > 电源管理 > DC降压型芯片 > Buck降压型芯片 >CXSD6285双PWM降压控制器和一个内部线性调节器用于DDR存储器和MCH电源解决方案两个同步PWM buck控制ler驱动四个N通道mosfet
CXSD6285双PWM降压控制器和一个内部线性调节器用于DDR存储器和MCH电源解决方案两个同步PWM buck控制ler驱动四个N通道mosfet
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CXSD6285两个同步PWM buck控制单元驱动四个N通道mosfet,用于DDR存储器供电电压(VDDQ)和MCH调节器。内部调节器设计用于在参考电压的一半时跟踪DDR存储器终端调节器(VTT)的源极和反相电流。

CXSD6285双PWM降压控制器和一个内部线性调节器用于DDR存储器和MCH电源解决方案两个同步PWM buck控制ler驱动四个N通道mosfet
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目录FLZ嘉泰姆

1.产品概述                       2.产品特点FLZ嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 FLZ嘉泰姆
5.产品封装图                     6.电路原理图                   FLZ嘉泰姆
7.功能概述                        8.相关产品FLZ嘉泰姆

一,产品概述(General Description)    FLZ嘉泰姆


      The CXSD6285 integrates Dual PWM buck controllers and an internal linear regulator for DDR memory and MCH power solution. The two synchronous PWM buck control-lers drive four N-channel MOSFETs for DDR memory sup-ply voltage (VDDQ) and MCH regulator. The internal regu-lator is designed to track at the half of the reference volt-age with sourcing and sinking current for DDR memory termination regulator (VTT).FLZ嘉泰姆
        The CXSD6285 uses the latched BUF_Cut signal and the POR of the BOOT to comply with ACPI power sequencing specifications. The two PWM regulators also provide POKsignals to indicate that the regulators are good. The de-vice also has the phase shift function between the two PWM controllers. The protection functions of the two PWM controllers include over-current protection, under-voltage protection, and external soft-start function. The VTT regu-lator provides 2A sinking and sourcing current-limit func-tion and also has thermal shutdown protection.FLZ嘉泰姆
        The TSSOP-24P package with a copper pad provides excellent thermal impedance is available.FLZ嘉泰姆
二.产品特点(Features)FLZ嘉泰姆


1.)Provide Synchronous Rectified Buck PWM Controllers for VDDQ and        VMCHFLZ嘉泰姆
2.)Integrated Power FETs with VTT RegulatorFLZ嘉泰姆
       Source/Sink up to 2.0AFLZ嘉泰姆
3.)Drive Low Cost N-Channel Power MOSFETsFLZ嘉泰姆
4.)Internal 0.8V Reference Voltage for AdjustableFLZ嘉泰姆
      VDDQ and VMCHFLZ嘉泰姆
5.)Thermal ShutdownFLZ嘉泰姆
6.)VTT Tracks at Half the Reference VoltageFLZ嘉泰姆
7.)Fixed Switching Frequency of 250kHz for VDDQFLZ嘉泰姆
     and VMCHFLZ嘉泰姆
8.)Over-Current Protection and Under-VoltageFLZ嘉泰姆
      Protection for VDDQ and VMCHFLZ嘉泰姆
9.)Fully Complies with ACPI Power SequencingFLZ嘉泰姆
      SpecificationsFLZ嘉泰姆
10.)180 degrees Phase Shift between VDDQ and VMCHFLZ嘉泰姆
11.)Power-OK Function for VDDQ and VMCHFLZ嘉泰姆
12.)Fast Transient ResponseFLZ嘉泰姆
       Maximum Duty Cycle 90%FLZ嘉泰姆
       High-Bandwidth Error AmplifierFLZ嘉泰姆
13.)Simple Single-Loop Control DesignFLZ嘉泰姆
      Voltage Mode PWM ControlFLZ嘉泰姆
      External Compensation
14.)External Soft-Start for VDDQ and VMCHFLZ嘉泰姆
15.)Shutdown Function for VDDQ/VTT and VMCHFLZ嘉泰姆
16.)Thermally Enhanced TSSOP-24P PackageFLZ嘉泰姆
17.)Lead Free and Green Devices Available (RoHS Compliant)FLZ嘉泰姆
三,应用范围 (Applications)FLZ嘉泰姆


 DDR Memory and MCH Power SupplyFLZ嘉泰姆
四.下载产品资料PDF文档 FLZ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FLZ嘉泰姆

 QQ截图20160419174301.jpgFLZ嘉泰姆

五,产品封装图 (Package)FLZ嘉泰姆


六.电路原理图FLZ嘉泰姆


FLZ嘉泰姆

七,功能概述FLZ嘉泰姆


Output Inductor SelectionFLZ嘉泰姆
The inductor value determines the inductor ripple current and affects the load transient response.FLZ嘉泰姆
Higher inductor value reduces the inductor’s ripple current and induces lower output ripple voltage.FLZ嘉泰姆
The ripple current and ripple voltage can be approximated by:where FS is the switching frequencyFLZ嘉泰姆
of the regulator.Although increases the inductor value to reduce the ripple current and voltage, thereFLZ嘉泰姆
is a tradeoff existing between the inductor’s ripple current and the regulator load tran-sient response time.FLZ嘉泰姆
A smaller inductor will give the regulator a faster load transient response at the expense of higher ripple current.FLZ嘉泰姆
The maximum ripple current occurs at the maximum in-put voltage. A good starting point is to chooseFLZ嘉泰姆
the ripple current to be approximately 30% of the maximum output current.Once the inductance valueFLZ嘉泰姆
has been chosen, select an inductor that is capable of carrying the required peak cur-rent without goingFLZ嘉泰姆
into saturation. In some types of inductors, especially core that is make of ferrite, the ripple current willFLZ嘉泰姆
increase abruptly when it saturates. This will result in a larger output ripple voltage.FLZ嘉泰姆
Output Capacitor SelectionFLZ嘉泰姆
Higher Capacitor value and lower ESR reduce the output ripple and the load transient drop. Therefore,FLZ嘉泰姆
select high performance low ESR capacitors are intended for switch-ing regulator applications.FLZ嘉泰姆
In some applications, mul-tiple capacitors have to be parallelled to achieve the de-sired ESR value.FLZ嘉泰姆
A small decoupling capacitor in parallel for bypassing the noise is also recommended, and theFLZ嘉泰姆
voltage rating of the output capacitors also must be considered. If tantalum capacitors are used,FLZ嘉泰姆
make sure they are surge tested by the manufactures. If in doubt, consult the capacitors manufacturer.FLZ嘉泰姆
Input Capacitor SelectionFLZ嘉泰姆
The input capacitor is chosen based on the voltage rat-ing and the RMS current rating. For reliableFLZ嘉泰姆
operation,select the capacitor voltage rating to be at least 1.3 times higher than the maximum input voltage.FLZ嘉泰姆
The maximum RMS current rating requirement is approximately IOUT/2,where IOUT is the load current.FLZ嘉泰姆
During power-up, the input capacitors have to handle large amount of surge current.FLZ嘉泰姆
If tantalum capacitors are used, make sure they are surge tested by the manufactures. If in doubt,FLZ嘉泰姆
consult the ca- pacitors manufacturer. For high frequency decoupling, a ceramic capacitor 1μF can beFLZ嘉泰姆
connected between the drain of upper MOSFET and the source of lower MOSFET.FLZ嘉泰姆
MOSFET SelectionFLZ嘉泰姆
The selection of the N-channel power MOSFETs are de-termined by the RDS(ON), reverse transferFLZ嘉泰姆
capacitance(CRSS)and maximum output current requirement. The losses in the MOSFETs have twoFLZ嘉泰姆
components: conduction loss and transition loss. For the upper and lower MOSFET, the losses areFLZ嘉泰姆
approximately given by the following equations:FLZ嘉泰姆
MOSFET Selection (Cont.)FLZ嘉泰姆
PUPPER = IOUT 2(1+ TC)(RDS(ON))D + (0.5)(IOUT)(VIN)(tSW)FSFLZ嘉泰姆
PLOWER = IOUT 2(1+ TC)(RDS(ON))(1-D)FLZ嘉泰姆
where IOUT is the load currentFLZ嘉泰姆
TC is the temperature dependency of RDS(ON)FLZ嘉泰姆
FS is the switching frequencyFLZ嘉泰姆
tSW is the switching intervalFLZ嘉泰姆
D is the duty cycleFLZ嘉泰姆
Note that both MOSFETs have conduction losses while the upper MOSFET includes an additional transitionFLZ嘉泰姆
loss.The switching internal, tSW, is the function of the reverse transfer capacitance CRSS. The (1+TC) termFLZ嘉泰姆
is to factor in the temperature dependency of the RDS(ON) and can be extracted from the “RDS(ON) vsFLZ嘉泰姆
Temperature” curve of the power MOSFET.FLZ嘉泰姆
Layout ConsiderationFLZ嘉泰姆
In high power switching regulator, a correct layout is im-portant to ensure proper operation of the regulator. InFLZ嘉泰姆
general, interconnecting impedances should be mini-mized by using short and wide printed circuit traces. Sig-FLZ嘉泰姆
nal and power grounds are to be kept separating and finally combined to use ground plane construction orFLZ嘉泰姆
single point grounding. Figure 14 illustrates the layout,with bold lines indicating high current paths; these tracesFLZ嘉泰姆
must be short and wide. Components along the boldlines should be placed close together.FLZ嘉泰姆
Below is a checklist for your layout:FLZ嘉泰姆
·-The metal plate of the bottom of the packages (TSSOP-24P) must be soldered to the PCB and con-nect toFLZ嘉泰姆
the GND plane on the backside through sev-eral thermal vias. More vias is better for heatsink.FLZ嘉泰姆
·-Keep the switching nodes (UGATE, LGATE, and PHASE) away from sensitive small signal nodesFLZ嘉泰姆
since these nodes are fast moving signals. Therefore,keep traces to these nodes as short as possible.FLZ嘉泰姆
· Connet the FB and VTTFB to point of load and the REFSEN should be connected to the point of load ofFLZ嘉泰姆
the VDDQ output.FLZ嘉泰姆
· The traces from the gate drivers to the MOSFETs (UG1,LG1, UG2, and LG2) should be short and wide.FLZ嘉泰姆
Decoupling capacitor, compensation component, the resistor dividers, boot capacitors, and SS capacitorsFLZ嘉泰姆
should be close to their pins.FLZ嘉泰姆
The input capacitor should be near the drain of the upper MOSFET; the output capacitor should be nearFLZ嘉泰姆
the loads.FLZ嘉泰姆
The input capacitor GND should be close to the out-put capacitor GND and the lower MOSFET GND.FLZ嘉泰姆
The drain of the MOSFETs (VIN and phase nodes)FLZ嘉泰姆
should be a large plane for heat sinking.FLZ嘉泰姆

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0.6|0.8FLZ嘉泰姆

5~12FLZ嘉泰姆

1200FLZ嘉泰姆

CXSD6297FLZ嘉泰姆

TDFN3x3-10FLZ嘉泰姆

VMFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

25FLZ嘉泰姆

4FLZ嘉泰姆

13.2FLZ嘉泰姆

0.8FLZ嘉泰姆

5~12FLZ嘉泰姆

2000FLZ嘉泰姆

CXSD6298FLZ嘉泰姆

TDFN3x3-10FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

25FLZ嘉泰姆

4.5FLZ嘉泰姆

25FLZ嘉泰姆

0.6FLZ嘉泰姆

5~12FLZ嘉泰姆

80FLZ嘉泰姆

CXSD6299|AFLZ嘉泰姆

SOP-8PFLZ嘉泰姆

VMFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

25FLZ嘉泰姆

4.5FLZ嘉泰姆

13.2FLZ嘉泰姆

0.8FLZ嘉泰姆

5~12FLZ嘉泰姆

16000FLZ嘉泰姆

CXSD62100FLZ嘉泰姆

TQFN3x3-10FLZ嘉泰姆

VMFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

25FLZ嘉泰姆

4.5FLZ嘉泰姆

13.2FLZ嘉泰姆

0.6FLZ嘉泰姆

5~12FLZ嘉泰姆

2500FLZ嘉泰姆

CXSD62101|LFLZ嘉泰姆

TDFN3x3-10FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

30FLZ嘉泰姆

3FLZ嘉泰姆

25FLZ嘉泰姆

0.8FLZ嘉泰姆

5~12FLZ嘉泰姆

2000FLZ嘉泰姆

CXSD62102FLZ嘉泰姆

TQFN3x3-16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

30FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.6FLZ嘉泰姆

5FLZ嘉泰姆

600FLZ嘉泰姆

CXSD62102AFLZ嘉泰姆

TQFN 3x3 16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

30FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.6FLZ嘉泰姆

5FLZ嘉泰姆

600FLZ嘉泰姆

CXSD62103FLZ嘉泰姆

QFN4x4-24FLZ嘉泰姆

VMFLZ嘉泰姆

2FLZ嘉泰姆

1FLZ嘉泰姆

50FLZ嘉泰姆

4.5FLZ嘉泰姆

13.2FLZ嘉泰姆

0.6FLZ嘉泰姆

5~12FLZ嘉泰姆

5000FLZ嘉泰姆

CXSD62104FLZ嘉泰姆

TQFN4x4-24FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

15FLZ嘉泰姆

6FLZ嘉泰姆

25FLZ嘉泰姆

2FLZ嘉泰姆

NFLZ嘉泰姆

550FLZ嘉泰姆

CXSD62105FLZ嘉泰姆

TQFN4x4-24FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

15FLZ嘉泰姆

6FLZ嘉泰姆

25FLZ嘉泰姆

2FLZ嘉泰姆

NFLZ嘉泰姆

550FLZ嘉泰姆

CXSD62106|AFLZ嘉泰姆

TQFN4x4-4FLZ嘉泰姆

TQFN3x3-20FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

20FLZ嘉泰姆

3FLZ嘉泰姆

28FLZ嘉泰姆

0.75FLZ嘉泰姆

5FLZ嘉泰姆

800FLZ嘉泰姆

CXSD62107FLZ嘉泰姆

TQFN3x3-16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

20FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.75FLZ嘉泰姆

5FLZ嘉泰姆

400FLZ嘉泰姆

CXSD62108FLZ嘉泰姆

QFN3.5x3.5-14FLZ嘉泰姆

TQFN3x3-16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

20FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.75FLZ嘉泰姆

5FLZ嘉泰姆

400FLZ嘉泰姆

CXSD62109FLZ嘉泰姆

TQFN3x3-16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

20FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.75FLZ嘉泰姆

5FLZ嘉泰姆

400FLZ嘉泰姆

CXSD62110FLZ嘉泰姆

QFN3x3-20FLZ嘉泰姆

TQFN3x3-16FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

20FLZ嘉泰姆

3FLZ嘉泰姆

28FLZ嘉泰姆

1.8|1.5|0.5FLZ嘉泰姆

5FLZ嘉泰姆

740FLZ嘉泰姆

CXSD62111FLZ嘉泰姆

TQFN4x4-24FLZ嘉泰姆

|QFN3x3-20FLZ嘉泰姆

CMFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

15FLZ嘉泰姆

5FLZ嘉泰姆

28FLZ嘉泰姆

0.5FLZ嘉泰姆

NFLZ嘉泰姆

3000FLZ嘉泰姆

CXSD62112FLZ嘉泰姆

TDFN3x3-10FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

20FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.5FLZ嘉泰姆

5FLZ嘉泰姆

250FLZ嘉泰姆

CXSD62113|CFLZ嘉泰姆

TQFN3x3-20FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

2FLZ嘉泰姆

15FLZ嘉泰姆

6FLZ嘉泰姆

25FLZ嘉泰姆

2FLZ嘉泰姆

NFLZ嘉泰姆

550FLZ嘉泰姆

CXSD62113EFLZ嘉泰姆

TQFN 3x3 20FLZ嘉泰姆

COTFLZ嘉泰姆

2FLZ嘉泰姆

2FLZ嘉泰姆

11FLZ嘉泰姆

6FLZ嘉泰姆

25FLZ嘉泰姆

2FLZ嘉泰姆

NFLZ嘉泰姆

550FLZ嘉泰姆

CXSD62114FLZ嘉泰姆

TQFN3x3-20FLZ嘉泰姆

COTFLZ嘉泰姆

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11FLZ嘉泰姆

5.5FLZ嘉泰姆

25FLZ嘉泰姆

2FLZ嘉泰姆

NFLZ嘉泰姆

280FLZ嘉泰姆

CXSD62115FLZ嘉泰姆

QFN4x4-24FLZ嘉泰姆

VMFLZ嘉泰姆

2FLZ嘉泰姆

1FLZ嘉泰姆

60FLZ嘉泰姆

3.1FLZ嘉泰姆

13.2FLZ嘉泰姆

0.85FLZ嘉泰姆

12FLZ嘉泰姆

5000FLZ嘉泰姆

CXSD62116A|B|CFLZ嘉泰姆

SOP-8PFLZ嘉泰姆

VMFLZ嘉泰姆

1FLZ嘉泰姆

1FLZ嘉泰姆

20FLZ嘉泰姆

2.9FLZ嘉泰姆

13.2FLZ嘉泰姆

0.8FLZ嘉泰姆

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16000FLZ嘉泰姆

CXSD62117FLZ嘉泰姆

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2FLZ嘉泰姆

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10FLZ嘉泰姆

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1FLZ嘉泰姆

12FLZ嘉泰姆

5000FLZ嘉泰姆

CXSD62118FLZ嘉泰姆

TDFN3x3-10FLZ嘉泰姆

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1FLZ嘉泰姆

1FLZ嘉泰姆

25FLZ嘉泰姆

1.8FLZ嘉泰姆

28FLZ嘉泰姆

0.7FLZ嘉泰姆

5FLZ嘉泰姆

250FLZ嘉泰姆

CXSD62119FLZ嘉泰姆

TQFN3x3-20FLZ嘉泰姆

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2FLZ嘉泰姆

1FLZ嘉泰姆

40FLZ嘉泰姆

1.8FLZ嘉泰姆

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REFIN SettingFLZ嘉泰姆

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QFN 3x3 20FLZ嘉泰姆

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1FLZ嘉泰姆

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3FLZ嘉泰姆

28FLZ嘉泰姆

1.8|1.5 1.35|1.2 0.5FLZ嘉泰姆

5FLZ嘉泰姆

800FLZ嘉泰姆

CXSD62121AFLZ嘉泰姆

TQFN3x3 20FLZ嘉泰姆

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1FLZ嘉泰姆

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3FLZ嘉泰姆

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0.75FLZ嘉泰姆

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CXSD62121BFLZ嘉泰姆

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3FLZ嘉泰姆

28FLZ嘉泰姆

0.75FLZ嘉泰姆

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220FLZ嘉泰姆

CXSD62121FLZ嘉泰姆

TQFN3x3-20FLZ嘉泰姆

COTFLZ嘉泰姆

1FLZ嘉泰姆

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5FLZ嘉泰姆

180FLZ嘉泰姆

 FLZ嘉泰姆

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