CXSD62118

CXSD62118在功率因数调制(PFM)或脉冲宽度调制(PWM)模式下都能提供良好的瞬态响应和准确的直流电压输出。在脉冲频率模式(PFM)下,CXSD62118在轻到重负载负载下都能提供非常高的效率-
调制开关频率

CXSD62118单相恒定时间同步的PWM控制器驱动N通道mosfet低压芯片组RAM电源

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产品简介

目录Fck嘉泰姆

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

一,产品概述(General Description)   Fck嘉泰姆


  The CXSD62118 is a single-phase, constant-on-time,synchronous PWM controller, which drives N-channel MOSFETs. The CXSD62118 steps down high voltage to generate low-voltage chipset or RAM supplies in notebook computers.Fck嘉泰姆
  The CXSD62118 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM), the CXSD62118 provides very high efficiency over light to heavy loads with loading-Fck嘉泰姆
modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low-noise requirements.Fck嘉泰姆
  The CXSD62118 is equipped with accurate positive current-limit, output under-voltage, and output over-voltage protections, perfect for NB applications. The Power-On-Reset function monitors the voltage on VCC to prevent wrong operation during power-on. The CXSD62118 has a 1ms digital soft-start and built-in an integrated output discharge method for soft-stop. An internal integratedFck嘉泰姆
soft-start ramps up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors with controlled reverse inductor current.Fck嘉泰姆
  The CXSD62118 is available in 10pin TDFN 3x3 package.Fck嘉泰姆
二.产品特点(Features)Fck嘉泰姆


Adjustable Output Voltage from +0.7V to +5.5VFck嘉泰姆
- 0.7V Reference VoltageFck嘉泰姆
- ±1% Accuracy Over-TemperatureFck嘉泰姆
Operates from an Input Battery Voltage Range ofFck嘉泰姆
+1.8V to +28VFck嘉泰姆
Power-On-Reset Monitoring on VCC PinFck嘉泰姆
Excellent Line and Load Transient ResponsesFck嘉泰姆
PFM Mode for Increased Light Load EfficiencyFck嘉泰姆
Selectable PWM Frequency from 4 Preset ValuesFck嘉泰姆
Integrated MOSFET DriversFck嘉泰姆
Integrated Bootstrap Forward P-CH MOSFETFck嘉泰姆
Adjustable Integrated Soft-Start and Soft-StopFck嘉泰姆
Selectable Forced PWM or Automatic PFM/PWM ModeFck嘉泰姆
Power Good MonitoringFck嘉泰姆
70% Under-Voltage ProtectionFck嘉泰姆
125% Over-Voltage ProtectionFck嘉泰姆
Adjustable Current-Limit ProtectionFck嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)Fck嘉泰姆
Over-Temperature ProtectionFck嘉泰姆
TDFN-10 3x3 PackageFck嘉泰姆
Lead Free and Green Devices AvailableFck嘉泰姆
三,应用范围 (Applications)Fck嘉泰姆


NotebookFck嘉泰姆
Table PCFck嘉泰姆
Hand-Held PortableFck嘉泰姆
AIO PCFck嘉泰姆
四.下载产品资料PDF文档 Fck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Fck嘉泰姆

 QQ截图20160419174301.jpgFck嘉泰姆

五,产品封装图 (Package)Fck嘉泰姆


blob.pngFck嘉泰姆

六.电路原理图Fck嘉泰姆


blob.pngFck嘉泰姆

七,功能概述Fck嘉泰姆


Input Capacitor Selection (Cont.)Fck嘉泰姆
higher than the maximum input voltage. The maximum RMS current rating requirement is approximatelyFck嘉泰姆

 IOUT/2,where IOUT is the load current. During power-up, the input capacitors have to handle great Fck嘉泰姆

amount of surge current.For low-duty notebook appliactions, ceramic capacitor is recommended. TheFck嘉泰姆

 capacitors must be connected be-tween the drain of high-side MOSFET and the source of low-side Fck嘉泰姆

MOSFET with very low-impeadance PCB layoutFck嘉泰姆
MOSFET SelectionFck嘉泰姆
The application for a notebook battery with a maximum voltage of 24V, at least a minimum 30V MOSFETsFck嘉泰姆

 should be used. The design has to trade off the gate charge with the RDS(ON) of the MOSFET:Fck嘉泰姆
For the low-side MOSFET, before it is turned on, the body diode has been conducting. The low-side MOSFETFck嘉泰姆

 driver will not charge the miller capacitor of this MOSFET.In the turning off process of the low-side MOSFET,Fck嘉泰姆

 the load current will shift to the body diode first. The high dv/dt of the phase node voltage will charge the Fck嘉泰姆

miller capaci-tor through the low-side MOSFET driver sinking current path. This results in much less switchingFck嘉泰姆

 loss of the low-side MOSFETs. The duty cycle is often very small in high battery voltage applications, and the Fck嘉泰姆

low-side MOSFET will conduct most of the switching cycle; therefore, when using smaller RDS(ON) of the low-side MOSFET, the con-verter can reduce power loss. The gate charge for this MOSFET is usually the Fck嘉泰姆

secondary consideration. The high-side MOSFET does not have this zero voltage switch- ing condition;Fck嘉泰姆

 in addition, because  it conducts for less time compared to the low-side MOSFET, the switching Fck嘉泰姆

loss tends to be dominant. Priority  should be given to the MOSFETs with less gate charge, so Fck嘉泰姆

that both the gate driver loss and switching loss  will be minimized.Fck嘉泰姆

The selection of the N-channel power MOSFETs are determined by the R DS(ON), reversingFck嘉泰姆

 transfer capaci-tance (CRSS) and maximum output current requirement. The losses in the Fck嘉泰姆

MOSFETs have two components:conduction loss and transition loss. For the high-side and Fck嘉泰姆

low-side MOSFETs, the losses are approximately given by the following equations:Fck嘉泰姆

Phigh-side = IOUT (1+ TC)(RDS(ON))D + (0.5)( IOUT)(VIN)( tSW)FSWFck嘉泰姆
Plow-side = IOUT (1+ TC)(RDS(ON))(1-D)Fck嘉泰姆
Where I is the load current OUTFck嘉泰姆
TC is the temperature dependency of RDS(ON)Fck嘉泰姆
FSW is the switching frequencyFck嘉泰姆
tSW is the switching intervalFck嘉泰姆
D is the duty cycleFck嘉泰姆
Note that both MOSFETs have conduction losses while the high-side MOSFET includes an additional Fck嘉泰姆

transition loss.The switching interval, tSW, is the function of the reverse transfer capacitance CRSS. Fck嘉泰姆

The (1+TC) term is a factor in the temperature dependency of the RDS(ON) and can be extracted Fck嘉泰姆

from the “RDS(ON) vs. Temperature” curve of the power MOSFET.Fck嘉泰姆
Layout ConsiderationFck嘉泰姆
In any high switching frequency converter, a correct layout is important to ensure proper operation Fck嘉泰姆

of the regulator.With power devices switching at higher frequency, the resulting current transient will Fck嘉泰姆

cause voltage spike across the interconnecting impedance and parasitic circuit elements. As an example,Fck嘉泰姆

 consider the turn-off transition of the PWM MOSFET. Before turn-off condition, the MOSFET is carryingFck嘉泰姆

 the full load current. During turn-off,current stops flowing in the MOSFET and is freewheeling by the Fck嘉泰姆

low side MOSFET and parasitic diode. Any parasitic inductance of the circuit generates a large voltage Fck嘉泰姆

spike during the switching interval. In general, using short and wide printed circuit traces shouldFck嘉泰姆

 minimize interconnect-ing impedances and the magnitude of voltage spike.Fck嘉泰姆
Besides, signal and power grounds are to be kept sepa-rating and finally combined using ground Fck嘉泰姆

plane construc-tion or single point grounding. The best tie-point between the signal ground and the Fck嘉泰姆

power ground is at the nega-tive side of the output capacitor on each channel, where there is less Fck嘉泰姆

noise. Noisy traces beneath the IC are not recommended. Below is a checklist for your layout:Fck嘉泰姆
· Keep the switching nodes (UGATE, LGATE, BOOT,and PHASE) away from sensitive small signal Fck嘉泰姆

nodes since these nodes are fast moving signals.Therefore, keep traces to these nodes as short asFck嘉泰姆
possible and there should be no other weak signal traces in parallel with theses traces on any layer.Fck嘉泰姆

Layout Consideration (Cont.)Fck嘉泰姆
· The signals going through theses traces have both high dv/dt and high di/dt with high peak Fck嘉泰姆

charging and discharging current. The traces from the gate drivers to the MOSFETs (UGATE and Fck嘉泰姆

LGATE) should be short and wide.Fck嘉泰姆
· Place the source of the high-side MOSFET and the drain of the low-side MOSFET as close as Fck嘉泰姆

possible.Minimizing the impedance with wide layout plane be-tween the two pads reduces the Fck嘉泰姆

voltage bounce of the node. In addition, the large layout plane between the drain of the Fck嘉泰姆

MOSFETs (VIN and PHASE nodes) can get better heat sinking.Fck嘉泰姆

The GND is the current sensing circuit reference ground and also the power ground of the Fck嘉泰姆

LGATE low-side MOSFET. On the other hand, the GND trace should be a separate trace andFck嘉泰姆

 independently go to the source of the low-side MOSFET. Besides, the cur-rent sense resistor Fck嘉泰姆

should be close to OCSET pin to avoid parasitic capacitor effect and noise coupling.Fck嘉泰姆

· Decoupling capacitors, the resistor-divider, and boot capacitor should be close to their pins. Fck嘉泰姆

(For example,place the decoupling ceramic capacitor close to the drain of the high-side MOSFETFck嘉泰姆

 as close as possible.)Fck嘉泰姆
· The input bulk capacitors should be close to the drain of the high-side MOSFET, and the outputFck嘉泰姆

 bulk capaci-tors should be close to the loads. The input capaci-tor’s ground should be close to theFck嘉泰姆

 grounds of the output capacitors and low-side MOSFET.Fck嘉泰姆
· Locate the resistor-divider close to the FB pin to mini-mize the high impedance trace. In addition, Fck嘉泰姆

FB pin traces can’t be close to the switching signal traces (UGATE, LGATE, BOOT, and PHASE).Fck嘉泰姆

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1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

3Fck嘉泰姆

13.2Fck嘉泰姆

0.6|0.8Fck嘉泰姆

5~12Fck嘉泰姆

1200Fck嘉泰姆

CXSD6297Fck嘉泰姆

TDFN3x3-10Fck嘉泰姆

VMFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

4Fck嘉泰姆

13.2Fck嘉泰姆

0.8Fck嘉泰姆

5~12Fck嘉泰姆

2000Fck嘉泰姆

CXSD6298Fck嘉泰姆

TDFN3x3-10Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

4.5Fck嘉泰姆

25Fck嘉泰姆

0.6Fck嘉泰姆

5~12Fck嘉泰姆

80Fck嘉泰姆

CXSD6299|AFck嘉泰姆

SOP-8PFck嘉泰姆

VMFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

4.5Fck嘉泰姆

13.2Fck嘉泰姆

0.8Fck嘉泰姆

5~12Fck嘉泰姆

16000Fck嘉泰姆

CXSD62100Fck嘉泰姆

TQFN3x3-10Fck嘉泰姆

VMFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

4.5Fck嘉泰姆

13.2Fck嘉泰姆

0.6Fck嘉泰姆

5~12Fck嘉泰姆

2500Fck嘉泰姆

CXSD62101|LFck嘉泰姆

TDFN3x3-10Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

30Fck嘉泰姆

3Fck嘉泰姆

25Fck嘉泰姆

0.8Fck嘉泰姆

5~12Fck嘉泰姆

2000Fck嘉泰姆

CXSD62102Fck嘉泰姆

TQFN3x3-16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

30Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.6Fck嘉泰姆

5Fck嘉泰姆

600Fck嘉泰姆

CXSD62102AFck嘉泰姆

TQFN 3x3 16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

30Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.6Fck嘉泰姆

5Fck嘉泰姆

600Fck嘉泰姆

CXSD62103Fck嘉泰姆

QFN4x4-24Fck嘉泰姆

VMFck嘉泰姆

2Fck嘉泰姆

1Fck嘉泰姆

50Fck嘉泰姆

4.5Fck嘉泰姆

13.2Fck嘉泰姆

0.6Fck嘉泰姆

5~12Fck嘉泰姆

5000Fck嘉泰姆

CXSD62104Fck嘉泰姆

TQFN4x4-24Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

6Fck嘉泰姆

25Fck嘉泰姆

2Fck嘉泰姆

NFck嘉泰姆

550Fck嘉泰姆

CXSD62105Fck嘉泰姆

TQFN4x4-24Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

6Fck嘉泰姆

25Fck嘉泰姆

2Fck嘉泰姆

NFck嘉泰姆

550Fck嘉泰姆

CXSD62106|AFck嘉泰姆

TQFN4x4-4Fck嘉泰姆

TQFN3x3-20Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

20Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

800Fck嘉泰姆

CXSD62107Fck嘉泰姆

TQFN3x3-16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

20Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

400Fck嘉泰姆

CXSD62108Fck嘉泰姆

QFN3.5x3.5-14Fck嘉泰姆

TQFN3x3-16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

20Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

400Fck嘉泰姆

CXSD62109Fck嘉泰姆

TQFN3x3-16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

20Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

400Fck嘉泰姆

CXSD62110Fck嘉泰姆

QFN3x3-20Fck嘉泰姆

TQFN3x3-16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

20Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

1.8|1.5|0.5Fck嘉泰姆

5Fck嘉泰姆

740Fck嘉泰姆

CXSD62111Fck嘉泰姆

TQFN4x4-24Fck嘉泰姆

|QFN3x3-20Fck嘉泰姆

CMFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

5Fck嘉泰姆

28Fck嘉泰姆

0.5Fck嘉泰姆

NFck嘉泰姆

3000Fck嘉泰姆

CXSD62112Fck嘉泰姆

TDFN3x3-10Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

20Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.5Fck嘉泰姆

5Fck嘉泰姆

250Fck嘉泰姆

CXSD62113|CFck嘉泰姆

TQFN3x3-20Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

6Fck嘉泰姆

25Fck嘉泰姆

2Fck嘉泰姆

NFck嘉泰姆

550Fck嘉泰姆

CXSD62113EFck嘉泰姆

TQFN 3x3 20Fck嘉泰姆

COTFck嘉泰姆

2Fck嘉泰姆

2Fck嘉泰姆

11Fck嘉泰姆

6Fck嘉泰姆

25Fck嘉泰姆

2Fck嘉泰姆

NFck嘉泰姆

550Fck嘉泰姆

CXSD62114Fck嘉泰姆

TQFN3x3-20Fck嘉泰姆

COTFck嘉泰姆

2Fck嘉泰姆

2Fck嘉泰姆

11Fck嘉泰姆

5.5Fck嘉泰姆

25Fck嘉泰姆

2Fck嘉泰姆

NFck嘉泰姆

280Fck嘉泰姆

CXSD62115Fck嘉泰姆

QFN4x4-24Fck嘉泰姆

VMFck嘉泰姆

2Fck嘉泰姆

1Fck嘉泰姆

60Fck嘉泰姆

3.1Fck嘉泰姆

13.2Fck嘉泰姆

0.85Fck嘉泰姆

12Fck嘉泰姆

5000Fck嘉泰姆

CXSD62116A|B|CFck嘉泰姆

SOP-8PFck嘉泰姆

VMFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

20Fck嘉泰姆

2.9Fck嘉泰姆

13.2Fck嘉泰姆

0.8Fck嘉泰姆

12Fck嘉泰姆

16000Fck嘉泰姆

CXSD62117Fck嘉泰姆

SOP-20Fck嘉泰姆

VMFck嘉泰姆

2Fck嘉泰姆

2Fck嘉泰姆

30Fck嘉泰姆

10Fck嘉泰姆

13.2Fck嘉泰姆

1Fck嘉泰姆

12Fck嘉泰姆

5000Fck嘉泰姆

CXSD62118Fck嘉泰姆

TDFN3x3-10Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

1Fck嘉泰姆

25Fck嘉泰姆

1.8Fck嘉泰姆

28Fck嘉泰姆

0.7Fck嘉泰姆

5Fck嘉泰姆

250Fck嘉泰姆

CXSD62119Fck嘉泰姆

TQFN3x3-20Fck嘉泰姆

COTFck嘉泰姆

2Fck嘉泰姆

1Fck嘉泰姆

40Fck嘉泰姆

1.8Fck嘉泰姆

25Fck嘉泰姆

REFIN SettingFck嘉泰姆

5Fck嘉泰姆

700Fck嘉泰姆

CXSD62120Fck嘉泰姆

QFN 3x3 20Fck嘉泰姆

TQFN 3x3 16Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

20Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

1.8|1.5 1.35|1.2 0.5Fck嘉泰姆

5Fck嘉泰姆

800Fck嘉泰姆

CXSD62121AFck嘉泰姆

TQFN3x3 20Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

220Fck嘉泰姆

CXSD62121BFck嘉泰姆

TQFN3x3 20Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

15Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

220Fck嘉泰姆

CXSD62121Fck嘉泰姆

TQFN3x3-20Fck嘉泰姆

COTFck嘉泰姆

1Fck嘉泰姆

2Fck嘉泰姆

20Fck嘉泰姆

3Fck嘉泰姆

28Fck嘉泰姆

0.75Fck嘉泰姆

5Fck嘉泰姆

180Fck嘉泰姆

 Fck嘉泰姆

 Fck嘉泰姆

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