目录uj1嘉泰姆

1.产品概述                       2.产品特点uj1嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 uj1嘉泰姆
5.产品封装图                     6.电路原理图                   uj1嘉泰姆
7.功能概述                        8.相关产品uj1嘉泰姆

一,产品概述(General Description)  uj1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 anduj1嘉泰姆
capacitors. The synchronous switches included inside increase the efficiency and eliminate the need for an external Schottky diode.uj1嘉泰姆
        The CXSD62133 is available in TDFN2x2-8 packageuj1嘉泰姆
二.产品特点(Features)uj1嘉泰姆

1A Output Currentuj1嘉泰姆
Support 4 AA alkaline, NiCd or NiMH batteriesuj1嘉泰姆
Wide 3.5V~7.2V Input Voltageuj1嘉泰姆
Fixed 1.5MHz Switching Frequencyuj1嘉泰姆
Low Dropout Operating at 100% duty cycleuj1嘉泰姆
Low 25μA Quiescent Currentuj1嘉泰姆
Integrate Synchronous Rectifieruj1嘉泰姆
0.6V Low Reference Voltageuj1嘉泰姆
<0.5μA Input Current during Shutdownuj1嘉泰姆
Current-Mode Operation with Internal Compensationuj1嘉泰姆
- Stable with Ceramic Output Capacitorsuj1嘉泰姆
- Fast Line Transient Responseuj1嘉泰姆
Short-Circuit Protectionuj1嘉泰姆
Over-Temperature Protection with Hysteresisuj1嘉泰姆
Available in TDFN2x2-8 Packageuj1嘉泰姆
Lead Free and Green Devices Availableuj1嘉泰姆
三,应用范围 (Applications)uj1嘉泰姆

E-Bookuj1嘉泰姆
Toyuj1嘉泰姆
Portable Instrumentuj1嘉泰姆
四.下载产品资料PDF文档 uj1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！uj1嘉泰姆

 uj1嘉泰姆

五,产品封装图 (Package)uj1嘉泰姆

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六.电路原理图uj1嘉泰姆

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七,功能概述uj1嘉泰姆

Dropout Operation (Cont.)uj1嘉泰姆

An important detail to remember is that on resistance of P-FET switch will increase at low input supply voltage.uj1嘉泰姆
Therefore, the user should calculate the power dissipa-tion when the CXSD62133 is used at 100% duty cycle withuj1嘉泰姆
low input voltage. uj1嘉泰姆
Over-Temperature Protection (OTP)uj1嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62133. When the junction temperature ex-uj1嘉泰姆
ceeds 150oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool. The thermal sen-uj1嘉泰姆
sor allows the converters to start a soft-start process and regulate the output voltage again after the junction tem-uj1嘉泰姆
perature cools by 30oC. The OTP designed with a 30oC hysteresis lowers the average Junction Temperature (TJ)uj1嘉泰姆
during continuous thermal overload conditions, increas-ing the life time of the device. uj1嘉泰姆
Short-Circuit Protectionuj1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-uj1嘉泰姆
nal frequency. This frequency fold back ensures that the inductor current has more time to decay, thereby prevent-uj1嘉泰姆
ing runaway. The oscillator’s frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V.uj1嘉泰姆
Low Battery Detectionuj1嘉泰姆
The low battery detection is used to monitor the battery voltage and to generate a signal. This function includesuj1嘉泰姆
two pins, LBI is the inverting input of the comparator and LBO is an open drain output (See Block Diagram). Whenuj1嘉泰姆
the LBI voltage drops below the threshold voltage 0.6V,the open drain device will turn on and LBO becomes low.uj1嘉泰姆
The Low battery threshold voltage can be programmed with a resistive divider from battery to LBI pin to the round.uj1嘉泰姆
Since the LBO is an open drain output, it usually requires an external pull-up resistor. uj1嘉泰姆

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