CXSD62133高效单片同步降压稳压器恒定的1.5MHz开关频率电感电流作为电流的控制量

目录O0h嘉泰姆

1.产品概述                       2.产品特点O0h嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 O0h嘉泰姆
5.产品封装图                     6.电路原理图                   O0h嘉泰姆
7.功能概述                        8.相关产品O0h嘉泰姆

一,产品概述(General Description)  O0h嘉泰姆

         The CXSD62133 is a high efficiency monolithic synchronous buck regulator. CXSD62133 operates with a constant 1.5MHz switching frequency and using the inductor current as a controlled quantity in the current modearchitecture. The 3.5V to 7.2V input voltage range makes the CXSD62133 ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable electrical devices. The internally fixed 1.5MHz operating frequency allows the use of small surface mount inductors andO0h嘉泰姆
capacitors. The synchronous switches included inside increase the efficiency and eliminate the need for an external Schottky diode.O0h嘉泰姆
        The CXSD62133 is available in TDFN2x2-8 packageO0h嘉泰姆
二.产品特点(Features)O0h嘉泰姆

1A Output CurrentO0h嘉泰姆
Support 4 AA alkaline, NiCd or NiMH batteriesO0h嘉泰姆
Wide 3.5V~7.2V Input VoltageO0h嘉泰姆
Fixed 1.5MHz Switching FrequencyO0h嘉泰姆
Low Dropout Operating at 100% duty cycleO0h嘉泰姆
Low 25μA Quiescent CurrentO0h嘉泰姆
Integrate Synchronous RectifierO0h嘉泰姆
0.6V Low Reference VoltageO0h嘉泰姆
<0.5μA Input Current during ShutdownO0h嘉泰姆
Current-Mode Operation with Internal CompensationO0h嘉泰姆
- Stable with Ceramic Output CapacitorsO0h嘉泰姆
- Fast Line Transient ResponseO0h嘉泰姆
Short-Circuit ProtectionO0h嘉泰姆
Over-Temperature Protection with HysteresisO0h嘉泰姆
Available in TDFN2x2-8 PackageO0h嘉泰姆
Lead Free and Green Devices AvailableO0h嘉泰姆
三,应用范围 (Applications)O0h嘉泰姆

E-BookO0h嘉泰姆
ToyO0h嘉泰姆
Portable InstrumentO0h嘉泰姆
四.下载产品资料PDF文档 O0h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！O0h嘉泰姆

 O0h嘉泰姆

五,产品封装图 (Package)O0h嘉泰姆

O0h嘉泰姆
六.电路原理图O0h嘉泰姆

O0h嘉泰姆
O0h嘉泰姆
七,功能概述O0h嘉泰姆

Dropout Operation (Cont.)O0h嘉泰姆

An important detail to remember is that on resistance of P-FET switch will increase at low input supply voltage.O0h嘉泰姆
Therefore, the user should calculate the power dissipa-tion when the CXSD62133 is used at 100% duty cycle withO0h嘉泰姆
low input voltage. O0h嘉泰姆
Over-Temperature Protection (OTP)O0h嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62133. When the junction temperature ex-O0h嘉泰姆
ceeds 150oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool. The thermal sen-O0h嘉泰姆
sor allows the converters to start a soft-start process and regulate the output voltage again after the junction tem-O0h嘉泰姆
perature cools by 30oC. The OTP designed with a 30oC hysteresis lowers the average Junction Temperature (TJ)O0h嘉泰姆
during continuous thermal overload conditions, increas-ing the life time of the device. O0h嘉泰姆
Short-Circuit ProtectionO0h嘉泰姆
When the output is shorted to ground, the frequency of the oscillator is reduced to about 210 kHz, 1/7 of the nomi-O0h嘉泰姆
nal frequency. This frequency fold back ensures that the inductor current has more time to decay, thereby prevent-O0h嘉泰姆
ing runaway. The oscillator’s frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V.O0h嘉泰姆
Low Battery DetectionO0h嘉泰姆
The low battery detection is used to monitor the battery voltage and to generate a signal. This function includesO0h嘉泰姆
two pins, LBI is the inverting input of the comparator and LBO is an open drain output (See Block Diagram). WhenO0h嘉泰姆
the LBI voltage drops below the threshold voltage 0.6V,the open drain device will turn on and LBO becomes low.O0h嘉泰姆
The Low battery threshold voltage can be programmed with a resistive divider from battery to LBI pin to the round.O0h嘉泰姆
Since the LBO is an open drain output, it usually requires an external pull-up resistor. O0h嘉泰姆

八,相关产品         更多同类产品.......O0h嘉泰姆