CXSU63140 a fixed switching frequency (1MHz typical), current-mode, step-up regulator with an inte-grated N-channel MOSFET. The device allows the usage of small inductors and output capacitors

目录nCQ嘉泰姆

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</span>                     6.电路原理图</span>                   
7.功能概述                        8.相关产品nCQ嘉泰姆

一,产品概述(General Description)  nCQ嘉泰姆

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

1.)Wide 2.5V to 6V Input Voltage Range
2.)Built-in 0.6Ω N-Channel MOSFET
3.)Built-in Soft-Start
4.)High Efficiency up to 90%
5.)<1μA Quiescent Current During Shutdown
6.)Current-Mode Operation
    Stable with Ceramic Output Capacitors
    Fast Transient Response
7.)Current-Limit Protection
8.)Over-Temperature Protection with Hysteresis
9.)Available in a Tiny 5-Pin SOT-23 and TSOT-23Packages
10.)Lead Free and Green Devices Available(RoHS Compliant)
三</span>,应用范围 (Applications)nCQ嘉泰姆

Cell Phone and Smart Phone
PDA, PMP, MP3
Digital Camera
Boost Regulators
四.下载产品资料PDF文档 nCQ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</span>！</span>
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五,产品封装图 (Package)nCQ嘉泰姆

nCQ嘉泰姆

六.电路原理图</span>nCQ嘉泰姆

nCQ嘉泰姆

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七</span>,功能概述nCQ嘉泰姆

Main Control Loop
The CXSU63140 is a constant frequency and current-mode switching regulator. In normal operation, 
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the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internalnCQ嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

supply current reduces to 1μA maximum.
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