1.5MHz高效单片同步降压调节器CXSD62130电流模式方案100%占空比从2.7V到6.0V的输入

目录zzC嘉泰姆

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

一,产品概述(General Description)   zzC嘉泰姆

 CXSD62130 CXSD62130A is a 1.5MHz high efficiency monolithic synchronous buck regulator. Design with current mode scheme,the CXSD62130 CXSD62130A is stable zzC嘉泰姆

with ceramic output capacitor. Input voltage from 2.7V to 6.0V makes the zzC嘉泰姆

CXSD62130 CXSD62130A ideally suited for single Li-Ion battery powered zzC嘉泰姆

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

battery life in portable electrical devices. Theinternally fixed 1.5MHz zzC嘉泰姆

operating frequency allows the using of small surface mount inductors and capacitors. The synchronous switches included inside increase the efficiencyzzC嘉泰姆

and eliminate the need of an external Schottky diode.zzC嘉泰姆
   The CXSD62130 CXSD62130A is available in TDFN2x2-6 packages.zzC嘉泰姆
二.产品特点(Features)zzC嘉泰姆

1A Output CurrentzzC嘉泰姆
Wide 2.7V~6.0V Input VoltagezzC嘉泰姆
Fixed 1.5MHz Switching FrequencyzzC嘉泰姆
Low Dropout Operating at 100% Duty CyclezzC嘉泰姆
25μA Quiescent CurrentzzC嘉泰姆
Synchronous RectifierzzC嘉泰姆
0.6V Reference VoltagezzC嘉泰姆
<0.5μA Input Current During ShutdownzzC嘉泰姆
Short-Circuit ProtectionzzC嘉泰姆
Over-Temperature ProtectionzzC嘉泰姆
Available in TDFN2x2-6 PackageszzC嘉泰姆
Lead Free and Green Devices AvailablezzC嘉泰姆
(RoHS Compliant)zzC嘉泰姆
三,应用范围 (Applications)zzC嘉泰姆

HD STBzzC嘉泰姆
BT MousezzC嘉泰姆
PND InstrumentzzC嘉泰姆
Portable InstrumentzzC嘉泰姆
四.下载产品资料PDF文档 zzC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！zzC嘉泰姆

 zzC嘉泰姆

五,产品封装图 (Package)zzC嘉泰姆

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六.电路原理图zzC嘉泰姆

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七,功能概述zzC嘉泰姆

Main Control LoopzzC嘉泰姆
The CXSD62130 CXSD62130A is a constant frequency, synchronous rectifier and current-mode zzC嘉泰姆

switching regulato r. In normal operation, the internal P-channel power MOSFET is turned on eachzzC嘉泰姆

 cycle. The peak inductor current at which ICMP turn off the P-FET is controlled by the voltage onzzC嘉泰姆

 the COMP node, which is the output of the error amplifier (EAMP). An external resistive divider zzC嘉泰姆

connected between VOUT and ground allows the EAMP to receive an output feedback voltage zzC嘉泰姆

VFB at FB pin. When the load current increases, it causes a slightly decrease in VFB relative tozzC嘉泰姆

the 0.6V reference, which in turn causes the COMP voltage to increase until the average zzC嘉泰姆

inductor current matches the new load current.zzC嘉泰姆
Enable/ShutdownzzC嘉泰姆
Driving RUN to the ground places the CXSD62130 CXSD62130A in shutdown mode. WhenzzC嘉泰姆

 in shutdown, the internal power MOSFETs turn off, all internal circuitry shuts down and thezzC嘉泰姆

 quiescent supply current reduces to 0.5μA maximum.zzC嘉泰姆
Pulse Frequency Modulation Mode (PFM)zzC嘉泰姆
The CXSD62130 CXSD62130A is a fixed frequency, peak current mode PWM step-down zzC嘉泰姆

converter. At light loads, the CXSD62130 CXSD62130A will automatically enter in pulse zzC嘉泰姆

frequency mode operation to reduce the dominant switching losses. In PFM operation, zzC嘉泰姆

the inductor current may reach zero or reverse on each pulse. A zero current comparator zzC嘉泰姆

turn off the N-FET, forcing DCM operation at light load. These controls get very low zzC嘉泰姆

quiescent current, help to maintain high effi-ciency over the complete load range.zzC嘉泰姆
Slope Compensation and Inductor Peak CurrentzzC嘉泰姆
The CXSD62130 CXSD62130A is a peak current mode PWM step downconverter. TozzC嘉泰姆

 prevent sub-harmonic oscillations, theCXSD62130 CXSD62130A sense the peak current and zzC嘉泰姆

add slope compensation to stable the converter. It is accomplished in-ternally by addingzzC嘉泰姆

a compensating ramp to the inductor current signal at duty cycles in excess of 40%.zzC嘉泰姆

 Normally,this results in a reduction of maximum inductor peak current for duty cycles >zzC嘉泰姆

 40%. However, the CXSD62130 CXSD62130A uses a special scheme that counteracts this zzC嘉泰姆

compensating ramp, which allows the maximum inductor peak current to remain unaffectedzzC嘉泰姆

 throughout all duty cycles.zzC嘉泰姆
Dropout OperationzzC嘉泰姆
As the input supply voltage decreases to a value ap-proaching the output voltage, the dutyzzC嘉泰姆

 cycle increases toward the maximum on time. Further, reduction of thesupply voltage forces zzC嘉泰姆

the main switch to remain on for more than one cycle until it reaches 100% duty cycle. ThezzC嘉泰姆

 input voltage minus the voltage drop will determine the output voltage across the P-FETzzC嘉泰姆

 and the inductor.An important detail to remember is that on resistance of P-FET switch zzC嘉泰姆

will increase at low input supply voltageTherefore, the user should calculate the power dissipa-zzC嘉泰姆
tion when the CXSD62130 CXSD62130A is used at 100% duty cycle with low input voltage.zzC嘉泰姆
Over-Temperature Protection (OTP)zzC嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62130 CXSD62130A. zzC嘉泰姆

When the junction temperature ex-ceeds 150oC, a thermal sensor turns off the both power zzC嘉泰姆

MOSFETs, allowing the devices to cool. The thermal sen-sor allows the converters to start a zzC嘉泰姆

soft-start process and regulate the output voltage again after the junction tem-perature coolszzC嘉泰姆

 by 30oC. The OTP is designed with a 30oC hysteresis to lower the average JunctionzzC嘉泰姆

 Temperature (TJ) during continuous thermal overload conditions, in-creasing the lifetime zzC嘉泰姆

of the device.zzC嘉泰姆
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