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cUj嘉泰姆

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

一,产品概述(General Description)   cUj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.cUj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-cUj嘉泰姆
modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low-noise requirements.cUj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 integratedcUj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.cUj嘉泰姆
  The CXSD62118 is available in 10pin TDFN 3x3 package.cUj嘉泰姆
二.产品特点(Features)cUj嘉泰姆


Adjustable Output Voltage from +0.7V to +5.5VcUj嘉泰姆
- 0.7V Reference VoltagecUj嘉泰姆
- ±1% Accuracy Over-TemperaturecUj嘉泰姆
Operates from an Input Battery Voltage Range ofcUj嘉泰姆
+1.8V to +28VcUj嘉泰姆
Power-On-Reset Monitoring on VCC PincUj嘉泰姆
Excellent Line and Load Transient ResponsescUj嘉泰姆
PFM Mode for Increased Light Load EfficiencycUj嘉泰姆
Selectable PWM Frequency from 4 Preset ValuescUj嘉泰姆
Integrated MOSFET DriverscUj嘉泰姆
Integrated Bootstrap Forward P-CH MOSFETcUj嘉泰姆
Adjustable Integrated Soft-Start and Soft-StopcUj嘉泰姆
Selectable Forced PWM or Automatic PFM/PWM ModecUj嘉泰姆
Power Good MonitoringcUj嘉泰姆
70% Under-Voltage ProtectioncUj嘉泰姆
125% Over-Voltage ProtectioncUj嘉泰姆
Adjustable Current-Limit ProtectioncUj嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)cUj嘉泰姆
Over-Temperature ProtectioncUj嘉泰姆
TDFN-10 3x3 PackagecUj嘉泰姆
Lead Free and Green Devices AvailablecUj嘉泰姆
三,应用范围 (Applications)cUj嘉泰姆


NotebookcUj嘉泰姆
Table PCcUj嘉泰姆
Hand-Held PortablecUj嘉泰姆
AIO PCcUj嘉泰姆
四.下载产品资料PDF文档 cUj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cUj嘉泰姆

 QQ截图20160419174301.jpgcUj嘉泰姆

五,产品封装图 (Package)cUj嘉泰姆


blob.pngcUj嘉泰姆

六.电路原理图cUj嘉泰姆


blob.pngcUj嘉泰姆

七,功能概述cUj嘉泰姆


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Phigh-side = IOUT (1+ TC)(RDS(ON))D + (0.5)( IOUT)(VIN)( tSW)FSWcUj嘉泰姆
Plow-side = IOUT (1+ TC)(RDS(ON))(1-D)cUj嘉泰姆
Where I is the load current OUTcUj嘉泰姆
TC is the temperature dependency of RDS(ON)cUj嘉泰姆
FSW is the switching frequencycUj嘉泰姆
tSW is the switching intervalcUj嘉泰姆
D is the duty cyclecUj嘉泰姆
Note that both MOSFETs have conduction losses while the high-side MOSFET includes an additional cUj嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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0.5cUj嘉泰姆

5cUj嘉泰姆

350cUj嘉泰姆

CXSD6294cUj嘉泰姆

QFN4x4-24cUj嘉泰姆

CMcUj嘉泰姆

2cUj嘉泰姆

1cUj嘉泰姆

40cUj嘉泰姆

4.5cUj嘉泰姆

13.2cUj嘉泰姆

0.6cUj嘉泰姆

5~12cUj嘉泰姆

4000cUj嘉泰姆

CXSD6295cUj嘉泰姆

SOP8PcUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

20cUj嘉泰姆

3cUj嘉泰姆

13.2cUj嘉泰姆

0.8cUj嘉泰姆

5~12cUj嘉泰姆

2500cUj嘉泰姆

CXSD6296A|B|C|DcUj嘉泰姆

SOP8PcUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

3cUj嘉泰姆

13.2cUj嘉泰姆

0.6|0.8cUj嘉泰姆

5~12cUj嘉泰姆

1200cUj嘉泰姆

CXSD6297cUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

4cUj嘉泰姆

13.2cUj嘉泰姆

0.8cUj嘉泰姆

5~12cUj嘉泰姆

2000cUj嘉泰姆

CXSD6298cUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

4.5cUj嘉泰姆

25cUj嘉泰姆

0.6cUj嘉泰姆

5~12cUj嘉泰姆

80cUj嘉泰姆

CXSD6299|AcUj嘉泰姆

SOP-8PcUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

4.5cUj嘉泰姆

13.2cUj嘉泰姆

0.8cUj嘉泰姆

5~12cUj嘉泰姆

16000cUj嘉泰姆

CXSD62100cUj嘉泰姆

TQFN3x3-10cUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

4.5cUj嘉泰姆

13.2cUj嘉泰姆

0.6cUj嘉泰姆

5~12cUj嘉泰姆

2500cUj嘉泰姆

CXSD62101|LcUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

30cUj嘉泰姆

3cUj嘉泰姆

25cUj嘉泰姆

0.8cUj嘉泰姆

5~12cUj嘉泰姆

2000cUj嘉泰姆

CXSD62102cUj嘉泰姆

TQFN3x3-16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

30cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.6cUj嘉泰姆

5cUj嘉泰姆

600cUj嘉泰姆

CXSD62102AcUj嘉泰姆

TQFN 3x3 16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

30cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.6cUj嘉泰姆

5cUj嘉泰姆

600cUj嘉泰姆

CXSD62103cUj嘉泰姆

QFN4x4-24cUj嘉泰姆

VMcUj嘉泰姆

2cUj嘉泰姆

1cUj嘉泰姆

50cUj嘉泰姆

4.5cUj嘉泰姆

13.2cUj嘉泰姆

0.6cUj嘉泰姆

5~12cUj嘉泰姆

5000cUj嘉泰姆

CXSD62104cUj嘉泰姆

TQFN4x4-24cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

6cUj嘉泰姆

25cUj嘉泰姆

2cUj嘉泰姆

NcUj嘉泰姆

550cUj嘉泰姆

CXSD62105cUj嘉泰姆

TQFN4x4-24cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

6cUj嘉泰姆

25cUj嘉泰姆

2cUj嘉泰姆

NcUj嘉泰姆

550cUj嘉泰姆

CXSD62106|AcUj嘉泰姆

TQFN4x4-4cUj嘉泰姆

TQFN3x3-20cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

20cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

800cUj嘉泰姆

CXSD62107cUj嘉泰姆

TQFN3x3-16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

20cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

400cUj嘉泰姆

CXSD62108cUj嘉泰姆

QFN3.5x3.5-14cUj嘉泰姆

TQFN3x3-16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

20cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

400cUj嘉泰姆

CXSD62109cUj嘉泰姆

TQFN3x3-16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

20cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

400cUj嘉泰姆

CXSD62110cUj嘉泰姆

QFN3x3-20cUj嘉泰姆

TQFN3x3-16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

20cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

1.8|1.5|0.5cUj嘉泰姆

5cUj嘉泰姆

740cUj嘉泰姆

CXSD62111cUj嘉泰姆

TQFN4x4-24cUj嘉泰姆

|QFN3x3-20cUj嘉泰姆

CMcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

5cUj嘉泰姆

28cUj嘉泰姆

0.5cUj嘉泰姆

NcUj嘉泰姆

3000cUj嘉泰姆

CXSD62112cUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

20cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.5cUj嘉泰姆

5cUj嘉泰姆

250cUj嘉泰姆

CXSD62113|CcUj嘉泰姆

TQFN3x3-20cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

6cUj嘉泰姆

25cUj嘉泰姆

2cUj嘉泰姆

NcUj嘉泰姆

550cUj嘉泰姆

CXSD62113EcUj嘉泰姆

TQFN 3x3 20cUj嘉泰姆

COTcUj嘉泰姆

2cUj嘉泰姆

2cUj嘉泰姆

11cUj嘉泰姆

6cUj嘉泰姆

25cUj嘉泰姆

2cUj嘉泰姆

NcUj嘉泰姆

550cUj嘉泰姆

CXSD62114cUj嘉泰姆

TQFN3x3-20cUj嘉泰姆

COTcUj嘉泰姆

2cUj嘉泰姆

2cUj嘉泰姆

11cUj嘉泰姆

5.5cUj嘉泰姆

25cUj嘉泰姆

2cUj嘉泰姆

NcUj嘉泰姆

280cUj嘉泰姆

CXSD62115cUj嘉泰姆

QFN4x4-24cUj嘉泰姆

VMcUj嘉泰姆

2cUj嘉泰姆

1cUj嘉泰姆

60cUj嘉泰姆

3.1cUj嘉泰姆

13.2cUj嘉泰姆

0.85cUj嘉泰姆

12cUj嘉泰姆

5000cUj嘉泰姆

CXSD62116A|B|CcUj嘉泰姆

SOP-8PcUj嘉泰姆

VMcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

20cUj嘉泰姆

2.9cUj嘉泰姆

13.2cUj嘉泰姆

0.8cUj嘉泰姆

12cUj嘉泰姆

16000cUj嘉泰姆

CXSD62117cUj嘉泰姆

SOP-20cUj嘉泰姆

VMcUj嘉泰姆

2cUj嘉泰姆

2cUj嘉泰姆

30cUj嘉泰姆

10cUj嘉泰姆

13.2cUj嘉泰姆

1cUj嘉泰姆

12cUj嘉泰姆

5000cUj嘉泰姆

CXSD62118cUj嘉泰姆

TDFN3x3-10cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

1cUj嘉泰姆

25cUj嘉泰姆

1.8cUj嘉泰姆

28cUj嘉泰姆

0.7cUj嘉泰姆

5cUj嘉泰姆

250cUj嘉泰姆

CXSD62119cUj嘉泰姆

TQFN3x3-20cUj嘉泰姆

COTcUj嘉泰姆

2cUj嘉泰姆

1cUj嘉泰姆

40cUj嘉泰姆

1.8cUj嘉泰姆

25cUj嘉泰姆

REFIN SettingcUj嘉泰姆

5cUj嘉泰姆

700cUj嘉泰姆

CXSD62120cUj嘉泰姆

QFN 3x3 20cUj嘉泰姆

TQFN 3x3 16cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

20cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

1.8|1.5 1.35|1.2 0.5cUj嘉泰姆

5cUj嘉泰姆

800cUj嘉泰姆

CXSD62121AcUj嘉泰姆

TQFN3x3 20cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

220cUj嘉泰姆

CXSD62121BcUj嘉泰姆

TQFN3x3 20cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

15cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

220cUj嘉泰姆

CXSD62121cUj嘉泰姆

TQFN3x3-20cUj嘉泰姆

COTcUj嘉泰姆

1cUj嘉泰姆

2cUj嘉泰姆

20cUj嘉泰姆

3cUj嘉泰姆

28cUj嘉泰姆

0.75cUj嘉泰姆

5cUj嘉泰姆

180cUj嘉泰姆

 cUj嘉泰姆

 cUj嘉泰姆

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