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qTt嘉泰姆

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

一,产品概述(General Description)  qTt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 andqTt嘉泰姆
capacitors. The synchronous switches included inside increase the efficiency and eliminate the need for an external Schottky diode.qTt嘉泰姆
        The CXSD62133 is available in TDFN2x2-8 packageqTt嘉泰姆
二.产品特点(Features)qTt嘉泰姆

1A Output CurrentqTt嘉泰姆
Support 4 AA alkaline, NiCd or NiMH batteriesqTt嘉泰姆
Wide 3.5V~7.2V Input VoltageqTt嘉泰姆
Fixed 1.5MHz Switching FrequencyqTt嘉泰姆
Low Dropout Operating at 100% duty cycleqTt嘉泰姆
Low 25μA Quiescent CurrentqTt嘉泰姆
Integrate Synchronous RectifierqTt嘉泰姆
0.6V Low Reference VoltageqTt嘉泰姆
<0.5μA Input Current during ShutdownqTt嘉泰姆
Current-Mode Operation with Internal CompensationqTt嘉泰姆
- Stable with Ceramic Output CapacitorsqTt嘉泰姆
- Fast Line Transient ResponseqTt嘉泰姆
Short-Circuit ProtectionqTt嘉泰姆
Over-Temperature Protection with HysteresisqTt嘉泰姆
Available in TDFN2x2-8 PackageqTt嘉泰姆
Lead Free and Green Devices AvailableqTt嘉泰姆
三,应用范围 (Applications)qTt嘉泰姆

E-BookqTt嘉泰姆
ToyqTt嘉泰姆
Portable InstrumentqTt嘉泰姆
四.下载产品资料PDF文档 qTt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！qTt嘉泰姆

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五,产品封装图 (Package)qTt嘉泰姆

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六.电路原理图qTt嘉泰姆

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七,功能概述qTt嘉泰姆

Dropout Operation (Cont.)qTt嘉泰姆

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

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