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gF4嘉泰姆

1.产品概述                       2.产品特点gF4嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 gF4嘉泰姆
5.产品封装图                     6.电路原理图                   gF4嘉泰姆
7.功能概述                        8.相关产品gF4嘉泰姆

一,产品概述(General Description)  gF4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 andgF4嘉泰姆
capacitors. The synchronous switches included inside increase the efficiency and eliminate the need for an external Schottky diode.gF4嘉泰姆
        The CXSD62133 is available in TDFN2x2-8 packagegF4嘉泰姆
二.产品特点(Features)gF4嘉泰姆

1A Output CurrentgF4嘉泰姆
Support 4 AA alkaline, NiCd or NiMH batteriesgF4嘉泰姆
Wide 3.5V~7.2V Input VoltagegF4嘉泰姆
Fixed 1.5MHz Switching FrequencygF4嘉泰姆
Low Dropout Operating at 100% duty cyclegF4嘉泰姆
Low 25μA Quiescent CurrentgF4嘉泰姆
Integrate Synchronous RectifiergF4嘉泰姆
0.6V Low Reference VoltagegF4嘉泰姆
<0.5μA Input Current during ShutdowngF4嘉泰姆
Current-Mode Operation with Internal CompensationgF4嘉泰姆
- Stable with Ceramic Output CapacitorsgF4嘉泰姆
- Fast Line Transient ResponsegF4嘉泰姆
Short-Circuit ProtectiongF4嘉泰姆
Over-Temperature Protection with HysteresisgF4嘉泰姆
Available in TDFN2x2-8 PackagegF4嘉泰姆
Lead Free and Green Devices AvailablegF4嘉泰姆
三,应用范围 (Applications)gF4嘉泰姆

E-BookgF4嘉泰姆
ToygF4嘉泰姆
Portable InstrumentgF4嘉泰姆
四.下载产品资料PDF文档 gF4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！gF4嘉泰姆

 gF4嘉泰姆

五,产品封装图 (Package)gF4嘉泰姆

gF4嘉泰姆
六.电路原理图gF4嘉泰姆

gF4嘉泰姆
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七,功能概述gF4嘉泰姆

Dropout Operation (Cont.)gF4嘉泰姆

An important detail to remember is that on resistance of P-FET switch will increase at low input supply voltage.gF4嘉泰姆
Therefore, the user should calculate the power dissipa-tion when the CXSD62133 is used at 100% duty cycle withgF4嘉泰姆
low input voltage. gF4嘉泰姆
Over-Temperature Protection (OTP)gF4嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSD62133. When the junction temperature ex-gF4嘉泰姆
ceeds 150oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool. The thermal sen-gF4嘉泰姆
sor allows the converters to start a soft-start process and regulate the output voltage again after the junction tem-gF4嘉泰姆
perature cools by 30oC. The OTP designed with a 30oC hysteresis lowers the average Junction Temperature (TJ)gF4嘉泰姆
during continuous thermal overload conditions, increas-ing the life time of the device. gF4嘉泰姆
Short-Circuit ProtectiongF4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-gF4嘉泰姆
nal frequency. This frequency fold back ensures that the inductor current has more time to decay, thereby prevent-gF4嘉泰姆
ing runaway. The oscillator’s frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V.gF4嘉泰姆
Low Battery DetectiongF4嘉泰姆
The low battery detection is used to monitor the battery voltage and to generate a signal. This function includesgF4嘉泰姆
two pins, LBI is the inverting input of the comparator and LBO is an open drain output (See Block Diagram). WhengF4嘉泰姆
the LBI voltage drops below the threshold voltage 0.6V,the open drain device will turn on and LBO becomes low.gF4嘉泰姆
The Low battery threshold voltage can be programmed with a resistive divider from battery to LBI pin to the round.gF4嘉泰姆
Since the LBO is an open drain output, it usually requires an external pull-up resistor. gF4嘉泰姆

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