目录ZUu嘉泰姆

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

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

1A Output CurrentZUu嘉泰姆
Support 4 AA alkaline, NiCd or NiMH batteriesZUu嘉泰姆
Wide 3.5V~7.2V Input VoltageZUu嘉泰姆
Fixed 1.5MHz Switching FrequencyZUu嘉泰姆
Low Dropout Operating at 100% duty cycleZUu嘉泰姆
Low 25μA Quiescent CurrentZUu嘉泰姆
Integrate Synchronous RectifierZUu嘉泰姆
0.6V Low Reference VoltageZUu嘉泰姆
<0.5μA Input Current during ShutdownZUu嘉泰姆
Current-Mode Operation with Internal CompensationZUu嘉泰姆
- Stable with Ceramic Output CapacitorsZUu嘉泰姆
- Fast Line Transient ResponseZUu嘉泰姆
Short-Circuit ProtectionZUu嘉泰姆
Over-Temperature Protection with HysteresisZUu嘉泰姆
Available in TDFN2x2-8 PackageZUu嘉泰姆
Lead Free and Green Devices AvailableZUu嘉泰姆
三,应用范围 (Applications)ZUu嘉泰姆

E-BookZUu嘉泰姆
ToyZUu嘉泰姆
Portable InstrumentZUu嘉泰姆
四.下载产品资料PDF文档 ZUu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！ZUu嘉泰姆

 ZUu嘉泰姆

五,产品封装图 (Package)ZUu嘉泰姆

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六.电路原理图ZUu嘉泰姆

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七,功能概述ZUu嘉泰姆

Dropout Operation (Cont.)ZUu嘉泰姆

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

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