目录3cJ嘉泰姆

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

一,产品概述(General Description)  3cJ嘉泰姆

           The CXSU63140 is a fixed switching frequency (1MHz typical), current-mode, step-up3cJ嘉泰姆
regulator with an inte-grated N-channel MOSFET. The device allows the usage of small3cJ嘉泰姆
inductors and output capacitors for portable devices. The current-mode control scheme3cJ嘉泰姆
provides fast transient response and good output voltage accuracy.The CXSU63140 includes3cJ嘉泰姆
under-voltage lockout, current-limit, and over-temperature shutdown preventing dam-3cJ嘉泰姆
age in the event of an output overload3cJ嘉泰姆
二.产品特点(Features)3cJ嘉泰姆

1.)Wide 2.5V to 6V Input Voltage Range3cJ嘉泰姆
2.)Built-in 0.6Ω N-Channel MOSFET3cJ嘉泰姆
3.)Built-in Soft-Start3cJ嘉泰姆
4.)High Efficiency up to 90%3cJ嘉泰姆
5.)<1μA Quiescent Current During Shutdown3cJ嘉泰姆
6.)Current-Mode Operation3cJ嘉泰姆
    Stable with Ceramic Output Capacitors3cJ嘉泰姆
    Fast Transient Response3cJ嘉泰姆
7.)Current-Limit Protection3cJ嘉泰姆
8.)Over-Temperature Protection with Hysteresis3cJ嘉泰姆
9.)Available in a Tiny 5-Pin SOT-23 and TSOT-23Packages3cJ嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)3cJ嘉泰姆
三,应用范围 (Applications)3cJ嘉泰姆

Cell Phone and Smart Phone3cJ嘉泰姆
PDA, PMP, MP33cJ嘉泰姆
Digital Camera3cJ嘉泰姆
Boost Regulators3cJ嘉泰姆
四.下载产品资料PDF文档 3cJ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！3cJ嘉泰姆

 3cJ嘉泰姆

五,产品封装图 (Package)3cJ嘉泰姆

3cJ嘉泰姆

六.电路原理图3cJ嘉泰姆

3cJ嘉泰姆
3cJ嘉泰姆

 3cJ嘉泰姆

七,功能概述3cJ嘉泰姆

Main Control Loop3cJ嘉泰姆
The CXSU63140 is a constant frequency and current-mode switching regulator. In normal operation, 3cJ嘉泰姆

the internal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal3cJ嘉泰姆

 RS latch, and then turned off when an internal comparator (ICMP) resets the latch. The peak inductor3cJ嘉泰姆

 current at which ICMP resets the RS latch is controlled by the voltage on the COMP node which is the3cJ嘉泰姆

 output of the error amplifier (EAMP). An external resis-tive divider connected between VOUT and 3cJ嘉泰姆

ground allows the EAMP to receive an output feedback voltage VFB at FB pin. When the load current3cJ嘉泰姆

 increases, it causes a slightly to decrease in VFB associated with the 1.23V reference,which in turn, 3cJ嘉泰姆

it causes the COMP voltage to increase until the average inductor current matches the new load current. 3cJ嘉泰姆
VIN Under-Voltage Lockout (UVLO)3cJ嘉泰姆
The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLO threshold 3cJ嘉泰姆

to ensure the input voltage is high enough for reliable operation.The 100mV (typ) hysteresis prevents3cJ嘉泰姆

 supply transients from causing a restart. Once the input voltage exceeds the UVLO rising threshold,3cJ嘉泰姆

 startup begins. When the in-put voltage falls below the UVLO falling threshold, the controller turns3cJ嘉泰姆

 off the converter.3cJ嘉泰姆
Soft-Start3cJ嘉泰姆
The CXSU63140 has a built-in soft-start to control the output voltage rise during start-up. During 3cJ嘉泰姆

soft-start, an internal ramp voltage, connected to the one of the positive inputs of the error 3cJ嘉泰姆

amplifier, raises up to replace the reference voltage (1.23V typical) until the ramp voltage 3cJ嘉泰姆

reaches the reference voltage.3cJ嘉泰姆
Current-Limit Protection3cJ嘉泰姆
The CXSU63140 monitors the inductor current, flows through the N-channel MOSFET, and 3cJ嘉泰姆

limits the current peak at current-limit level to prevent loads and the CXSU63140 from 3cJ嘉泰姆

damaging during overload or short-circuit conditions.3cJ嘉泰姆
Over-Temperature Protection (OTP)3cJ嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSU63140. When 3cJ嘉泰姆

the junction temperature ex-ceeds 150 oC, a thermal sensor turns off the power MOSFET3cJ嘉泰姆

 allowing the devices to cool. The thermal sen-sor allows the converters to start a soft-start3cJ嘉泰姆

 process and regulates the output voltage again after the junction tem-perature cools by 40oC. 3cJ嘉泰姆

The OTP is designed with a 40oC hysteresis to lower the average Junction Temperature3cJ嘉泰姆
(TJ) during continuous thermal overload conditions in-creasing the lifetime of the device.3cJ嘉泰姆
Enable/Shutdown3cJ嘉泰姆
Driving EN to the ground places the CXSU63140 in shut- down mode. When in shutdown, 3cJ嘉泰姆

the internal power MOSFET turns off, all internal circuitry shuts down, andthe quiescent 3cJ嘉泰姆

supply current reduces to 1μA maximum.3cJ嘉泰姆
八,相关产品                    更多同类产品......3cJ嘉泰姆

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