目录OHy嘉泰姆

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

一,产品概述(General Description)  OHy嘉泰姆

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

1.)Wide 2.5V to 6V Input Voltage RangeOHy嘉泰姆
2.)Built-in 0.6Ω N-Channel MOSFETOHy嘉泰姆
3.)Built-in Soft-StartOHy嘉泰姆
4.)High Efficiency up to 90%OHy嘉泰姆
5.)<1μA Quiescent Current During ShutdownOHy嘉泰姆
6.)Current-Mode OperationOHy嘉泰姆
    Stable with Ceramic Output CapacitorsOHy嘉泰姆
    Fast Transient ResponseOHy嘉泰姆
7.)Current-Limit ProtectionOHy嘉泰姆
8.)Over-Temperature Protection with HysteresisOHy嘉泰姆
9.)Available in a Tiny 5-Pin SOT-23 and TSOT-23PackagesOHy嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)OHy嘉泰姆
三,应用范围 (Applications)OHy嘉泰姆

Cell Phone and Smart PhoneOHy嘉泰姆
PDA, PMP, MP3OHy嘉泰姆
Digital CameraOHy嘉泰姆
Boost RegulatorsOHy嘉泰姆
四.下载产品资料PDF文档 OHy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！OHy嘉泰姆

 OHy嘉泰姆

五,产品封装图 (Package)OHy嘉泰姆

OHy嘉泰姆

六.电路原理图OHy嘉泰姆

OHy嘉泰姆
OHy嘉泰姆

 OHy嘉泰姆

七,功能概述OHy嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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