目录RAI嘉泰姆

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

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

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

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

1.)Wide 2.7V to 6V Input Voltage RangeRAI嘉泰姆
2.)Built-in 0.2Ω N-Channel MOSFETRAI嘉泰姆
3.)Built-in Soft-StartRAI嘉泰姆
4.)High Efficiency up to 90%RAI嘉泰姆
5.)<1μA Quiescent Current During ShutdownRAI嘉泰姆
6.)Current-Mode OperationRAI嘉泰姆
    Stable with Ceramic Output CapacitorsRAI嘉泰姆
    Fast Transient ResponseRAI嘉泰姆
7.)Current-Limit ProtectionRAI嘉泰姆
8.)Over-Temperature Protection with HysteresisRAI嘉泰姆
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-ageRAI嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)RAI嘉泰姆
三,应用范围 (Applications)RAI嘉泰姆

Cell Phone and Smart PhoneRAI嘉泰姆
PDA, PMP, MP3RAI嘉泰姆
Digital CameraRAI嘉泰姆
Boost RegulatorsRAI嘉泰姆
四.下载产品资料PDF文档 RAI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！RAI嘉泰姆

 RAI嘉泰姆

五,产品封装图 (Package)RAI嘉泰姆

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六.电路原理图RAI嘉泰姆

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七,功能概述RAI嘉泰姆

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

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

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

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

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

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

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

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

current matches the new load current. RAI嘉泰姆

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

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

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

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

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

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

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

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

short-circuit conditions.RAI嘉泰姆

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

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

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

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

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

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

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