CXSD62152同步降压转换器85mΩ高端和75mΩ低功率mosfet
发表时间:2020-04-29
浏览次数:96

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

一,产品概述(General Description)         mCI嘉泰姆
       CXSD62152/A is a synchronous buck converters with integrated 85m ΩmCI嘉泰姆
high side and 75m Ω low side power MOSFETs. The CXSD62152/A with amCI嘉泰姆
current-mode control scheme can convert wide input voltage of 2.9V to 6V tomCI嘉泰姆
the output voltage adjustable from 0.8V to 6V to provide excellent outputmCI嘉泰姆
voltage regulation.mCI嘉泰姆
        The CXSD62152/A is equipped with an automatic Skip/PWM modemCI嘉泰姆
operation. At light load , the IC operates in the Skip mode to reduce themCI嘉泰姆
switching losses. At heavy load, the IC works in PWM mode. The CXSD62152/AmCI嘉泰姆
is also equipped with Power-on-reset, soft start, soft-stop, and whole protectionsmCI嘉泰姆
(under-voltage,over-voltage, over-temperature and current-limit) into a single package.mCI嘉泰姆
This device, available in SOP-8, TDFN3x3-10 packages,provides a very compactmCI嘉泰姆
system solution external components and PCB area.mCI嘉泰姆
二.产品特点(Features)mCI嘉泰姆
High Efficiency up to 94%mCI嘉泰姆
Adjustable Output Voltage from 0.8V to V PVDDmCI嘉泰姆
Operating from 2.9 to 6V SupplymCI嘉泰姆
Integrated 85m High Side / 75m Low SidemCI嘉泰姆
MOSFETsmCI嘉泰姆
Low Dropout Operation: 100% Duty CyclemCI嘉泰姆
Stable with Low ESR Ceramic CapacitorsmCI嘉泰姆
Current up to 2AmCI嘉泰姆
Power-On-Reset Detection on VCC and VINmCI嘉泰姆
Mode Selestion :CXSD62152 : Automatic PFM/PWM CXSD62152A : Forced PWMmCI嘉泰姆
Integrate Soft-Start and Soft-StopmCI嘉泰姆
Over-Temperature ProtectionmCI嘉泰姆
Over-Voltage ProtectionmCI嘉泰姆
Under-Voltage ProtectionmCI嘉泰姆
High/ Low Side Current LimitmCI嘉泰姆
Power Good IndicationmCI嘉泰姆
Enable/Shutdown FunctionmCI嘉泰姆
Available in SOP-8P and TDFN3x3-10 PackagesmCI嘉泰姆
Lead Free and Green Devices AvailablemCI嘉泰姆
三,应用范围 (Applications)mCI嘉泰姆
Notebook Computer & UMPCmCI嘉泰姆
LCD Monitor/TVmCI嘉泰姆
Set-Top BoxmCI嘉泰姆
DSL, Switch HUBrmCI嘉泰姆
Portable InstrumentmCI嘉泰姆
四.下载产品资料PDF文档 mCI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mCI嘉泰姆

 QQ截图20160419174301.jpgmCI嘉泰姆

 mCI嘉泰姆

五,产品封装图 (Package)mCI嘉泰姆

mCI嘉泰姆
六.电路原理图mCI嘉泰姆
blob.pngmCI嘉泰姆

七,功能概述mCI嘉泰姆


VCC and VIN Power-On-Reset (POR)mCI嘉泰姆
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations whichmCI嘉泰姆
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-mCI嘉泰姆
ing threshold is 2.7V (typical) with 0.2V hysteresis and VIN POR rising threshold is 2.3V with 0.05V hysteresis.mCI嘉泰姆
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up processmCI嘉泰姆
and ramps up the output voltage to the voltage target. mCI嘉泰姆
Output Under-Voltage Protection (UVP)mCI嘉泰姆
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limitmCI嘉泰姆
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continuallymCI嘉泰姆
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lowermCI嘉泰姆
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of themCI嘉泰姆
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrongmCI嘉泰姆
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.mCI嘉泰姆
Over-Voltage Protection (OVP)mCI嘉泰姆
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of themCI嘉泰姆
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparatormCI嘉泰姆
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action activelymCI嘉泰姆
pulls down the output voltage. As soon as the output voltage is less than 0.2V, the CXSD62152/A will be latched offmCI嘉泰姆
and needs a POR or enable to recover to normal operation.mCI嘉泰姆
Over-Temperature Protection (OTP)mCI嘉泰姆
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperaturemCI嘉泰姆
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.mCI嘉泰姆
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again aftermCI嘉泰姆
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJmCI嘉泰姆
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.mCI嘉泰姆
Current-Limit Protection mCI嘉泰姆
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limitsmCI嘉泰姆
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-mCI嘉泰姆
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.mCI嘉泰姆
 Soft-StartmCI嘉泰姆
The CXSD62152/A has a built-in soft-start to control the rise rate of the output voltage and limit the input current surgemCI嘉泰姆
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the errormCI嘉泰姆
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches themCI嘉泰姆
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability ismCI嘉泰姆
disabled until the output voltage reaches the voltage target.mCI嘉泰姆
Soft-StopmCI嘉泰姆
At the moment of shutdown controlled by EN signal, under-voltage event or over-temperature protection, theCXSD62152/A initiates a soft-stop process to discharge the output voltage in the output capacitors. Certainly, the loadmCI嘉泰姆
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.mCI嘉泰姆
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After themCI嘉泰姆
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.mCI嘉泰姆
八,相关产品                更多同类产品.......mCI嘉泰姆


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