目录qjt嘉泰姆

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

一,产品概述(General Description)  qjt嘉泰姆

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

1.)Wide 2.5V to 6V Input Voltage Rangeqjt嘉泰姆
2.)Built-in 0.6Ω N-Channel MOSFETqjt嘉泰姆
3.)Built-in Soft-Startqjt嘉泰姆
4.)High Efficiency up to 90%qjt嘉泰姆
5.)<1μA Quiescent Current During Shutdownqjt嘉泰姆
6.)Current-Mode Operationqjt嘉泰姆
    Stable with Ceramic Output Capacitorsqjt嘉泰姆
    Fast Transient Responseqjt嘉泰姆
7.)Current-Limit Protectionqjt嘉泰姆
8.)Over-Temperature Protection with Hysteresisqjt嘉泰姆
9.)Available in a Tiny 5-Pin SOT-23 and TSOT-23Packagesqjt嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)qjt嘉泰姆
三,应用范围 (Applications)qjt嘉泰姆

Cell Phone and Smart Phoneqjt嘉泰姆
PDA, PMP, MP3qjt嘉泰姆
Digital Cameraqjt嘉泰姆
Boost Regulatorsqjt嘉泰姆
四.下载产品资料PDF文档 qjt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！qjt嘉泰姆

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五,产品封装图 (Package)qjt嘉泰姆

qjt嘉泰姆

六.电路原理图qjt嘉泰姆

qjt嘉泰姆
qjt嘉泰姆

 qjt嘉泰姆

七,功能概述qjt嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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