目录ua8嘉泰姆

1.产品概述                       2.产品特点ua8嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 ua8嘉泰姆
5.产品封装图                     6.电路原理图                   ua8嘉泰姆
7.功能概述                        8.相关产品ua8嘉泰姆

一,产品概述(General Description)         ua8嘉泰姆

          The CXSU63138 is a fixed switching frequency (1.5MHz typical), current-mode,ua8嘉泰姆
step-up regulator with an inte-grated N-channel MOSFET. The device allows the usageua8嘉泰姆
of small inductors and output capacitors for portable devices. The current-mode control ua8嘉泰姆

scheme provides fast transient response and good output voltage accuracy. The CXSU63138 includes under-voltage lockout, current-limit, and over-temperature shutdown preventing ua8嘉泰姆

dam-age in the event of an output overloadua8嘉泰姆
二.产品特点(Features)ua8嘉泰姆

1.)Wide 2.7V to 6V Input Voltage Rangeua8嘉泰姆
2.)Built-in 0.2Ω N-Channel MOSFETua8嘉泰姆
3.)Built-in Soft-Startua8嘉泰姆
4.)High Efficiency up to 90%ua8嘉泰姆
5.)<1μA Quiescent Current During Shutdownua8嘉泰姆
6.)Current-Mode Operationua8嘉泰姆
    Stable with Ceramic Output Capacitorsua8嘉泰姆
    Fast Transient Responseua8嘉泰姆
7.)Current-Limit Protectionua8嘉泰姆
8.)Over-Temperature Protection with Hysteresisua8嘉泰姆
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-ageua8嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)ua8嘉泰姆
三,应用范围 (Applications)ua8嘉泰姆

Cell Phone and Smart Phoneua8嘉泰姆
PDA, PMP, MP3ua8嘉泰姆
Digital Cameraua8嘉泰姆
Boost Regulatorsua8嘉泰姆
四.下载产品资料PDF文档 ua8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！ua8嘉泰姆

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五,产品封装图 (Package)ua8嘉泰姆

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六.电路原理图ua8嘉泰姆

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七,功能概述ua8嘉泰姆

Main Control Loopua8嘉泰姆
The CXSU63138 is a constant frequency and current-mode switching regulator. In normal operation, the internal ua8嘉泰姆

N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch,ua8嘉泰姆

 and then turned off when an internal comparator (ICMP) resets the latch. The peak inductor ua8嘉泰姆

current at which ICMP resets the RS latch is controlled by the voltage on the COMP node whichua8嘉泰姆

is the output of the error amplifier (EAMP). An external resis-tive divider connected between ua8嘉泰姆

VOUT and ground allows the EAMP to receive an output feedback voltage VFB at FB pin. Whenua8嘉泰姆

the load current increases, it causes a slightly to decrease in VFB associated with the 1.23Vua8嘉泰姆

reference,which in turn, it causes the COMP voltage to increase until the average inductor ua8嘉泰姆

current matches the new load current. ua8嘉泰姆

VIN Under-Voltage Lockout (UVLO)ua8嘉泰姆
The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLOua8嘉泰姆

 threshold to ensure the input voltage is high enough for reliable operation.The 100mV (typ) ua8嘉泰姆

hysteresis prevents supply transients from causing a restart. Once the input voltage exceeds ua8嘉泰姆

the UVLO rising threshold, startup begins. When the in-put voltage falls below the UVLO fallingua8嘉泰姆

 threshold, the controller turns off the converter.ua8嘉泰姆
Soft-Startua8嘉泰姆
The CXSU63138 has a built-in soft-start to control the output voltage rise during start-up. During soft-start, anua8嘉泰姆

 internal ramp voltage, connected to the one of the positive inputs of the error amplifier, raises up to replace the ua8嘉泰姆

reference voltage (1.23V typical) until the ramp voltage reaches the reference voltage.ua8嘉泰姆
Current-Limit Protectionua8嘉泰姆
The CXSU63138 monitors the inductor current, flows through the N-channel MOSFET, and limitsua8嘉泰姆

 the current peak at current-limit level to prevent loads and the CXSU63138 from damaging during overload or ua8嘉泰姆

short-circuit conditions.ua8嘉泰姆

Over-Temperature Protection (OTP)ua8嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSU63138. When the ua8嘉泰姆

junction temperature  ex-ceeds 150 oC, a thermal sensor turns off the power MOSFET allowingua8嘉泰姆

 the devices to cool. The thermal sen-sor allows the converters to start a soft-start process and ua8嘉泰姆

regulates the output voltage again after the junction tem-perature cools by 40oC. The OTP is designed ua8嘉泰姆

with a 40oC hysteresis to lower the average Junction Temperature (TJ) during continuous thermal overloadua8嘉泰姆

 conditions in-creasing the lifetime of the device. ua8嘉泰姆

Enable/Shutdownua8嘉泰姆
Driving EN to the ground places the CXSU63138 in shut-down mode. When in shutdown, the internal powerua8嘉泰姆
MOSFET turns off, all internal circuitry shuts down, and the quiescent supply current reduces to 1μA maximum.ua8嘉泰姆
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