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

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

一,产品概述(General Description)  

         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 and
capacitors. The synchronous switches included inside increase the efficiency and eliminate the need for an external Schottky diode.
        The CXSD62133 is available in TDFN2x2-8 package
二.产品特点(Features)

1A Output Current
Support 4 AA alkaline, NiCd or NiMH batteries
Wide 3.5V~7.2V Input Voltage
Fixed 1.5MHz Switching Frequency
Low Dropout Operating at 100% duty cycle
Low 25μA Quiescent Current
Integrate Synchronous Rectifier
0.6V Low Reference Voltage
<0.5μA Input Current during Shutdown
Current-Mode Operation with Internal Compensation
- Stable with Ceramic Output Capacitors
- Fast Line Transient Response
Short-Circuit Protection
Over-Temperature Protection with Hysteresis
Available in TDFN2x2-8 Package
Lead Free and Green Devices Available
三,应用范围 (Applications)

E-Book
Toy
Portable Instrument
四.下载产品资料PDF文档 

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五,产品封装图 (Package)

六.电路原理图

七,功能概述

Dropout Operation (Cont.)

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

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