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CXSD62125 1.5MHz高效单片同步降压稳压器电流模式设计陶瓷输出电容稳定单锂离子电池供电
发表时间:2020-04-25浏览次数:9
CXSD62125 1.5MHz高效单片同步降压稳压器电流模式设计陶瓷输出电容稳定单锂离子电池供电
 

目录bPO嘉泰姆

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

一,产品概述(General Description)         bPO嘉泰姆
       CXSD62125 CXSD62125A is a 1.5MHz high efficiency monolithic synchronous buck regulator.Design with current mode scheme,the CXSD62125 CXSD62125A is stable with ceramic output capacitor. Input voltage from 2.7V to 6.0V makes the CXSD62125 CXSD62125A ideally suited for single Li-Ion battery powered bPO嘉泰姆

applications. 100%duty cycle provides low dropout operation, extending battery bPO嘉泰姆

life in portable electrical devices.The internally fixed 1.5MHz operating frequencybPO嘉泰姆

 allows the using of small surface mount inductors and capacitors. The synchronous switches included inside increase the efficiency and eliminate the need of an external Schottky diode.bPO嘉泰姆

The CXSD62125 CXSD62125A is available in SOT-23-5/TSOT-23-5A packages.bPO嘉泰姆
二.产品特点(Features)bPO嘉泰姆
1A Output CurrentbPO嘉泰姆
Wide 2.7V~6.0V Input VoltagebPO嘉泰姆
Fixed 1.5MHz Switching FrequencybPO嘉泰姆
Low Dropout Operating at 100% Duty CyclebPO嘉泰姆
25μA Quiescent CurrentbPO嘉泰姆
Integrate Synchronous RectifierbPO嘉泰姆
0.6V Reference VoltagebPO嘉泰姆
Current-Mode Operation with InternalbPO嘉泰姆
CompensationbPO嘉泰姆
- Stable with Ceramic Output CapacitorsbPO嘉泰姆
- Fast Line Transient ResponsebPO嘉泰姆
Short-Circuit ProtectionbPO嘉泰姆
Over-Temperature Protection with HysteresisbPO嘉泰姆
Available in SOT-23-5/TSOT-23-5A PackagesbPO嘉泰姆
Lead Free and Green Devices Available (RoHS Compliant)bPO嘉泰姆
三,应用范围 (Applications)bPO嘉泰姆

HD STBbPO嘉泰姆

BT MousebPO嘉泰姆
PND InstrumentbPO嘉泰姆
Portable InstrumentbPO嘉泰姆
四.下载产品资料PDF文档 bPO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bPO嘉泰姆

 QQ截图20160419174301.jpgbPO嘉泰姆

五,产品封装图 (Package)bPO嘉泰姆

blob.pngbPO嘉泰姆

六.电路原理图bPO嘉泰姆

blob.pngbPO嘉泰姆

七,功能概述bPO嘉泰姆


In most applications, the CXSD62125 CXSD62125A does not dissipate much heat due to its high efficiency. But, in applications where the CXSD62125 CXSD62125A is running at high ambient tempera ture with low supply voltage and high duty cycles, the heat dissipated may exceed the maximum junction temperature of the part. If the junction temperature reaches ap-proximately 150°C, both power switches will be turned off and the SW node will become high impedance.To avoid the CXSD62125 CXSD62125A from exceeding the maximum junction temperature, the user will need to do some thermal analysis. The goal of the thermal analysis is to determine whether the power dissipated exceeds the maxi-mum junction temperature of the part. The power dissipated by the part is approximated:bPO嘉泰姆
PD ≅ IOUT2 x (RP-FET x D+RN-FET x (1-D))bPO嘉泰姆
The temperature rise is given by:bPO嘉泰姆
TR = (PD)(èJA)bPO嘉泰姆
Where PD is the power dissipated by the regulator, D isbPO嘉泰姆
duty cycle of main switchbPO嘉泰姆
D = VOUT/VINbPO嘉泰姆
The èJA is the thermal resistance from the junction of thebPO嘉泰姆
die to the ambient temperature. The junction temperature,bPO嘉泰姆
TJ, is given by:bPO嘉泰姆
TJ = TA + TRbPO嘉泰姆
Where TA is the ambient temperature.
Layout ConsiderationbPO嘉泰姆
For all switching power supplies, the layout is an important step in the design; especially at high peak currentsbPO嘉泰姆
and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and dutybPO嘉泰姆
cycle jitter.bPO嘉泰姆
1. The input capacitor should be placed close to the VIN and GND. Connecting the capacitor and VIN/GND withbPO嘉泰姆
short and wide trace without any via holes for good input voltage filtering. The distance between VIN/GNDbPO嘉泰姆
to capacitor less than 2mm respectively is recommended.bPO嘉泰姆
2. To minimize copper trace connections that can inject noise into the system, the inductor should be placedbPO嘉泰姆
as close as possible to the SW pin to minimize the noise coupling into other circuits.bPO嘉泰姆
3. The output capacitor should be place closed to converter VOUT and GND.bPO嘉泰姆
4. Since the feedback pin and network is a high impedance circuit the feedback network should be routedbPO嘉泰姆
away from the inductor. The feedback pin and feedback network should be shielded with a ground planebPO嘉泰姆
or trace to minimize noise coupling into this circuit.bPO嘉泰姆
5. A star ground connection or ground plane minimizes ground shifts and noise is recommended.bPO嘉泰姆
八,相关产品               更多同类产品.......bPO嘉泰姆


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