目录Ql3嘉泰姆

1.产品概述                       2.产品特点Ql3嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 Ql3嘉泰姆
5.产品封装图                     6.电路原理图                   Ql3嘉泰姆
7.功能概述                        8.相关产品Ql3嘉泰姆

一,产品概述(General Description)  Ql3嘉泰姆

           The CXSU63140 is a fixed switching frequency (1MHz typical), current-mode, step-upQl3嘉泰姆
regulator with an inte-grated N-channel MOSFET. The device allows the usage of smallQl3嘉泰姆
inductors and output capacitors for portable devices. The current-mode control schemeQl3嘉泰姆
provides fast transient response and good output voltage accuracy.The CXSU63140 includesQl3嘉泰姆
under-voltage lockout, current-limit, and over-temperature shutdown preventing dam-Ql3嘉泰姆
age in the event of an output overloadQl3嘉泰姆
二.产品特点(Features)Ql3嘉泰姆

1.)Wide 2.5V to 6V Input Voltage RangeQl3嘉泰姆
2.)Built-in 0.6Ω N-Channel MOSFETQl3嘉泰姆
3.)Built-in Soft-StartQl3嘉泰姆
4.)High Efficiency up to 90%Ql3嘉泰姆
5.)<1μA Quiescent Current During ShutdownQl3嘉泰姆
6.)Current-Mode OperationQl3嘉泰姆
    Stable with Ceramic Output CapacitorsQl3嘉泰姆
    Fast Transient ResponseQl3嘉泰姆
7.)Current-Limit ProtectionQl3嘉泰姆
8.)Over-Temperature Protection with HysteresisQl3嘉泰姆
9.)Available in a Tiny 5-Pin SOT-23 and TSOT-23PackagesQl3嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)Ql3嘉泰姆
三,应用范围 (Applications)Ql3嘉泰姆

Cell Phone and Smart PhoneQl3嘉泰姆
PDA, PMP, MP3Ql3嘉泰姆
Digital CameraQl3嘉泰姆
Boost RegulatorsQl3嘉泰姆
四.下载产品资料PDF文档 Ql3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！Ql3嘉泰姆

 Ql3嘉泰姆

五,产品封装图 (Package)Ql3嘉泰姆

Ql3嘉泰姆

六.电路原理图Ql3嘉泰姆

Ql3嘉泰姆
Ql3嘉泰姆

 Ql3嘉泰姆

七,功能概述Ql3嘉泰姆

Main Control LoopQl3嘉泰姆
The CXSU63140 is a constant frequency and current-mode switching regulator. In normal operation, Ql3嘉泰姆

the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internalQl3嘉泰姆

 RS latch, and then turned off when an internal comparator (ICMP) resets the latch. The peak inductorQl3嘉泰姆

 current at which ICMP resets the RS latch is controlled by the voltage on the COMP node which is theQl3嘉泰姆

 output of the error amplifier (EAMP). An external resis-tive divider connected between VOUT and Ql3嘉泰姆

ground allows the EAMP to receive an output feedback voltage VFB at FB pin. When the load currentQl3嘉泰姆

 increases, it causes a slightly to decrease in VFB associated with the 1.23V reference,which in turn, Ql3嘉泰姆

it causes the COMP voltage to increase until the average inductor current matches the new load current. Ql3嘉泰姆
VIN Under-Voltage Lockout (UVLO)Ql3嘉泰姆
The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLO threshold Ql3嘉泰姆

to ensure the input voltage is high enough for reliable operation.The 100mV (typ) hysteresis preventsQl3嘉泰姆

 supply transients from causing a restart. Once the input voltage exceeds the UVLO rising threshold,Ql3嘉泰姆

 startup begins. When the in-put voltage falls below the UVLO falling threshold, the controller turnsQl3嘉泰姆

 off the converter.Ql3嘉泰姆
Soft-StartQl3嘉泰姆
The CXSU63140 has a built-in soft-start to control the output voltage rise during start-up. During Ql3嘉泰姆

soft-start, an internal ramp voltage, connected to the one of the positive inputs of the error Ql3嘉泰姆

amplifier, raises up to replace the reference voltage (1.23V typical) until the ramp voltage Ql3嘉泰姆

reaches the reference voltage.Ql3嘉泰姆
Current-Limit ProtectionQl3嘉泰姆
The CXSU63140 monitors the inductor current, flows through the N-channel MOSFET, and Ql3嘉泰姆

limits the current peak at current-limit level to prevent loads and the CXSU63140 from Ql3嘉泰姆

damaging during overload or short-circuit conditions.Ql3嘉泰姆
Over-Temperature Protection (OTP)Ql3嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSU63140. When Ql3嘉泰姆

the junction temperature ex-ceeds 150 oC, a thermal sensor turns off the power MOSFETQl3嘉泰姆

 allowing the devices to cool. The thermal sen-sor allows the converters to start a soft-startQl3嘉泰姆

 process and regulates the output voltage again after the junction tem-perature cools by 40oC. Ql3嘉泰姆

The OTP is designed with a 40oC hysteresis to lower the average Junction TemperatureQl3嘉泰姆
(TJ) during continuous thermal overload conditions in-creasing the lifetime of the device.Ql3嘉泰姆
Enable/ShutdownQl3嘉泰姆
Driving EN to the ground places the CXSU63140 in shut- down mode. When in shutdown, Ql3嘉泰姆

the internal power MOSFET turns off, all internal circuitry shuts down, andthe quiescent Ql3嘉泰姆

supply current reduces to 1μA maximum.Ql3嘉泰姆
八,相关产品                    更多同类产品......Ql3嘉泰姆

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