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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 >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
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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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HwO嘉泰姆

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

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


Adjustable Output Voltage from +0.7V to +5.5VHwO嘉泰姆
- 0.7V Reference VoltageHwO嘉泰姆
- ±1% Accuracy Over-TemperatureHwO嘉泰姆
Operates from an Input Battery Voltage Range ofHwO嘉泰姆
+1.8V to +28VHwO嘉泰姆
Power-On-Reset Monitoring on VCC PinHwO嘉泰姆
Excellent Line and Load Transient ResponsesHwO嘉泰姆
PFM Mode for Increased Light Load EfficiencyHwO嘉泰姆
Selectable PWM Frequency from 4 Preset ValuesHwO嘉泰姆
Integrated MOSFET DriversHwO嘉泰姆
Integrated Bootstrap Forward P-CH MOSFETHwO嘉泰姆
Adjustable Integrated Soft-Start and Soft-StopHwO嘉泰姆
Selectable Forced PWM or Automatic PFM/PWM ModeHwO嘉泰姆
Power Good MonitoringHwO嘉泰姆
70% Under-Voltage ProtectionHwO嘉泰姆
125% Over-Voltage ProtectionHwO嘉泰姆
Adjustable Current-Limit ProtectionHwO嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)HwO嘉泰姆
Over-Temperature ProtectionHwO嘉泰姆
TDFN-10 3x3 PackageHwO嘉泰姆
Lead Free and Green Devices AvailableHwO嘉泰姆
三,应用范围 (Applications)HwO嘉泰姆


NotebookHwO嘉泰姆
Table PCHwO嘉泰姆
Hand-Held PortableHwO嘉泰姆
AIO PCHwO嘉泰姆
四.下载产品资料PDF文档 HwO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HwO嘉泰姆

 QQ截图20160419174301.jpgHwO嘉泰姆

五,产品封装图 (Package)HwO嘉泰姆


blob.pngHwO嘉泰姆

六.电路原理图HwO嘉泰姆


blob.pngHwO嘉泰姆

七,功能概述HwO嘉泰姆


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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Phigh-side = IOUT (1+ TC)(RDS(ON))D + (0.5)( IOUT)(VIN)( tSW)FSWHwO嘉泰姆
Plow-side = IOUT (1+ TC)(RDS(ON))(1-D)HwO嘉泰姆
Where I is the load current OUTHwO嘉泰姆
TC is the temperature dependency of RDS(ON)HwO嘉泰姆
FSW is the switching frequencyHwO嘉泰姆
tSW is the switching intervalHwO嘉泰姆
D is the duty cycleHwO嘉泰姆
Note that both MOSFETs have conduction losses while the high-side MOSFET includes an additional HwO嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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25HwO嘉泰姆

3HwO嘉泰姆

25HwO嘉泰姆

0.6HwO嘉泰姆

5HwO嘉泰姆

1700HwO嘉泰姆

CXSD6293HwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

3HwO嘉泰姆

25HwO嘉泰姆

0.5HwO嘉泰姆

5HwO嘉泰姆

350HwO嘉泰姆

CXSD6294HwO嘉泰姆

QFN4x4-24HwO嘉泰姆

CMHwO嘉泰姆

2HwO嘉泰姆

1HwO嘉泰姆

40HwO嘉泰姆

4.5HwO嘉泰姆

13.2HwO嘉泰姆

0.6HwO嘉泰姆

5~12HwO嘉泰姆

4000HwO嘉泰姆

CXSD6295HwO嘉泰姆

SOP8PHwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

20HwO嘉泰姆

3HwO嘉泰姆

13.2HwO嘉泰姆

0.8HwO嘉泰姆

5~12HwO嘉泰姆

2500HwO嘉泰姆

CXSD6296A|B|C|DHwO嘉泰姆

SOP8PHwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

3HwO嘉泰姆

13.2HwO嘉泰姆

0.6|0.8HwO嘉泰姆

5~12HwO嘉泰姆

1200HwO嘉泰姆

CXSD6297HwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

4HwO嘉泰姆

13.2HwO嘉泰姆

0.8HwO嘉泰姆

5~12HwO嘉泰姆

2000HwO嘉泰姆

CXSD6298HwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

4.5HwO嘉泰姆

25HwO嘉泰姆

0.6HwO嘉泰姆

5~12HwO嘉泰姆

80HwO嘉泰姆

CXSD6299|AHwO嘉泰姆

SOP-8PHwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

4.5HwO嘉泰姆

13.2HwO嘉泰姆

0.8HwO嘉泰姆

5~12HwO嘉泰姆

16000HwO嘉泰姆

CXSD62100HwO嘉泰姆

TQFN3x3-10HwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

4.5HwO嘉泰姆

13.2HwO嘉泰姆

0.6HwO嘉泰姆

5~12HwO嘉泰姆

2500HwO嘉泰姆

CXSD62101|LHwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

30HwO嘉泰姆

3HwO嘉泰姆

25HwO嘉泰姆

0.8HwO嘉泰姆

5~12HwO嘉泰姆

2000HwO嘉泰姆

CXSD62102HwO嘉泰姆

TQFN3x3-16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

30HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.6HwO嘉泰姆

5HwO嘉泰姆

600HwO嘉泰姆

CXSD62102AHwO嘉泰姆

TQFN 3x3 16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

30HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.6HwO嘉泰姆

5HwO嘉泰姆

600HwO嘉泰姆

CXSD62103HwO嘉泰姆

QFN4x4-24HwO嘉泰姆

VMHwO嘉泰姆

2HwO嘉泰姆

1HwO嘉泰姆

50HwO嘉泰姆

4.5HwO嘉泰姆

13.2HwO嘉泰姆

0.6HwO嘉泰姆

5~12HwO嘉泰姆

5000HwO嘉泰姆

CXSD62104HwO嘉泰姆

TQFN4x4-24HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

6HwO嘉泰姆

25HwO嘉泰姆

2HwO嘉泰姆

NHwO嘉泰姆

550HwO嘉泰姆

CXSD62105HwO嘉泰姆

TQFN4x4-24HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

6HwO嘉泰姆

25HwO嘉泰姆

2HwO嘉泰姆

NHwO嘉泰姆

550HwO嘉泰姆

CXSD62106|AHwO嘉泰姆

TQFN4x4-4HwO嘉泰姆

TQFN3x3-20HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

20HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

800HwO嘉泰姆

CXSD62107HwO嘉泰姆

TQFN3x3-16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

20HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

400HwO嘉泰姆

CXSD62108HwO嘉泰姆

QFN3.5x3.5-14HwO嘉泰姆

TQFN3x3-16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

20HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

400HwO嘉泰姆

CXSD62109HwO嘉泰姆

TQFN3x3-16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

20HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

400HwO嘉泰姆

CXSD62110HwO嘉泰姆

QFN3x3-20HwO嘉泰姆

TQFN3x3-16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

20HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

1.8|1.5|0.5HwO嘉泰姆

5HwO嘉泰姆

740HwO嘉泰姆

CXSD62111HwO嘉泰姆

TQFN4x4-24HwO嘉泰姆

|QFN3x3-20HwO嘉泰姆

CMHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

5HwO嘉泰姆

28HwO嘉泰姆

0.5HwO嘉泰姆

NHwO嘉泰姆

3000HwO嘉泰姆

CXSD62112HwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

20HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.5HwO嘉泰姆

5HwO嘉泰姆

250HwO嘉泰姆

CXSD62113|CHwO嘉泰姆

TQFN3x3-20HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

6HwO嘉泰姆

25HwO嘉泰姆

2HwO嘉泰姆

NHwO嘉泰姆

550HwO嘉泰姆

CXSD62113EHwO嘉泰姆

TQFN 3x3 20HwO嘉泰姆

COTHwO嘉泰姆

2HwO嘉泰姆

2HwO嘉泰姆

11HwO嘉泰姆

6HwO嘉泰姆

25HwO嘉泰姆

2HwO嘉泰姆

NHwO嘉泰姆

550HwO嘉泰姆

CXSD62114HwO嘉泰姆

TQFN3x3-20HwO嘉泰姆

COTHwO嘉泰姆

2HwO嘉泰姆

2HwO嘉泰姆

11HwO嘉泰姆

5.5HwO嘉泰姆

25HwO嘉泰姆

2HwO嘉泰姆

NHwO嘉泰姆

280HwO嘉泰姆

CXSD62115HwO嘉泰姆

QFN4x4-24HwO嘉泰姆

VMHwO嘉泰姆

2HwO嘉泰姆

1HwO嘉泰姆

60HwO嘉泰姆

3.1HwO嘉泰姆

13.2HwO嘉泰姆

0.85HwO嘉泰姆

12HwO嘉泰姆

5000HwO嘉泰姆

CXSD62116A|B|CHwO嘉泰姆

SOP-8PHwO嘉泰姆

VMHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

20HwO嘉泰姆

2.9HwO嘉泰姆

13.2HwO嘉泰姆

0.8HwO嘉泰姆

12HwO嘉泰姆

16000HwO嘉泰姆

CXSD62117HwO嘉泰姆

SOP-20HwO嘉泰姆

VMHwO嘉泰姆

2HwO嘉泰姆

2HwO嘉泰姆

30HwO嘉泰姆

10HwO嘉泰姆

13.2HwO嘉泰姆

1HwO嘉泰姆

12HwO嘉泰姆

5000HwO嘉泰姆

CXSD62118HwO嘉泰姆

TDFN3x3-10HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

1HwO嘉泰姆

25HwO嘉泰姆

1.8HwO嘉泰姆

28HwO嘉泰姆

0.7HwO嘉泰姆

5HwO嘉泰姆

250HwO嘉泰姆

CXSD62119HwO嘉泰姆

TQFN3x3-20HwO嘉泰姆

COTHwO嘉泰姆

2HwO嘉泰姆

1HwO嘉泰姆

40HwO嘉泰姆

1.8HwO嘉泰姆

25HwO嘉泰姆

REFIN SettingHwO嘉泰姆

5HwO嘉泰姆

700HwO嘉泰姆

CXSD62120HwO嘉泰姆

QFN 3x3 20HwO嘉泰姆

TQFN 3x3 16HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

20HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

1.8|1.5 1.35|1.2 0.5HwO嘉泰姆

5HwO嘉泰姆

800HwO嘉泰姆

CXSD62121AHwO嘉泰姆

TQFN3x3 20HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

220HwO嘉泰姆

CXSD62121BHwO嘉泰姆

TQFN3x3 20HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

15HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

220HwO嘉泰姆

CXSD62121HwO嘉泰姆

TQFN3x3-20HwO嘉泰姆

COTHwO嘉泰姆

1HwO嘉泰姆

2HwO嘉泰姆

20HwO嘉泰姆

3HwO嘉泰姆

28HwO嘉泰姆

0.75HwO嘉泰姆

5HwO嘉泰姆

180HwO嘉泰姆

 HwO嘉泰姆

 HwO嘉泰姆

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