目录P2k嘉泰姆

1.产品概述                       2.产品特点P2k嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 P2k嘉泰姆
5.产品封装图                     6.电路原理图                   P2k嘉泰姆
7.功能概述                        8.相关产品P2k嘉泰姆

一,产品概述(General Description)         P2k嘉泰姆

          The CXSU63138 is a fixed switching frequency (1.5MHz typical), current-mode,P2k嘉泰姆
step-up regulator with an inte-grated N-channel MOSFET. The device allows the usageP2k嘉泰姆
of small inductors and output capacitors for portable devices. The current-mode control P2k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 P2k嘉泰姆

dam-age in the event of an output overloadP2k嘉泰姆
二.产品特点(Features)P2k嘉泰姆

1.)Wide 2.7V to 6V Input Voltage RangeP2k嘉泰姆
2.)Built-in 0.2Ω N-Channel MOSFETP2k嘉泰姆
3.)Built-in Soft-StartP2k嘉泰姆
4.)High Efficiency up to 90%P2k嘉泰姆
5.)<1μA Quiescent Current During ShutdownP2k嘉泰姆
6.)Current-Mode OperationP2k嘉泰姆
    Stable with Ceramic Output CapacitorsP2k嘉泰姆
    Fast Transient ResponseP2k嘉泰姆
7.)Current-Limit ProtectionP2k嘉泰姆
8.)Over-Temperature Protection with HysteresisP2k嘉泰姆
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-ageP2k嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)P2k嘉泰姆
三,应用范围 (Applications)P2k嘉泰姆

Cell Phone and Smart PhoneP2k嘉泰姆
PDA, PMP, MP3P2k嘉泰姆
Digital CameraP2k嘉泰姆
Boost RegulatorsP2k嘉泰姆
四.下载产品资料PDF文档 P2k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！P2k嘉泰姆

 P2k嘉泰姆

五,产品封装图 (Package)P2k嘉泰姆

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六.电路原理图P2k嘉泰姆

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P2k嘉泰姆

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七,功能概述P2k嘉泰姆

Main Control LoopP2k嘉泰姆
The CXSU63138 is a constant frequency and current-mode switching regulator. In normal operation, the internal P2k嘉泰姆

N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch,P2k嘉泰姆

 and then turned off when an internal comparator (ICMP) resets the latch. The peak inductor P2k嘉泰姆

current at which ICMP resets the RS latch is controlled by the voltage on the COMP node whichP2k嘉泰姆

is the output of the error amplifier (EAMP). An external resis-tive divider connected between P2k嘉泰姆

VOUT and ground allows the EAMP to receive an output feedback voltage VFB at FB pin. WhenP2k嘉泰姆

the load current increases, it causes a slightly to decrease in VFB associated with the 1.23VP2k嘉泰姆

reference,which in turn, it causes the COMP voltage to increase until the average inductor P2k嘉泰姆

current matches the new load current. P2k嘉泰姆

VIN Under-Voltage Lockout (UVLO)P2k嘉泰姆
The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLOP2k嘉泰姆

 threshold to ensure the input voltage is high enough for reliable operation.The 100mV (typ) P2k嘉泰姆

hysteresis prevents supply transients from causing a restart. Once the input voltage exceeds P2k嘉泰姆

the UVLO rising threshold, startup begins. When the in-put voltage falls below the UVLO fallingP2k嘉泰姆

 threshold, the controller turns off the converter.P2k嘉泰姆
Soft-StartP2k嘉泰姆
The CXSU63138 has a built-in soft-start to control the output voltage rise during start-up. During soft-start, anP2k嘉泰姆

 internal ramp voltage, connected to the one of the positive inputs of the error amplifier, raises up to replace the P2k嘉泰姆

reference voltage (1.23V typical) until the ramp voltage reaches the reference voltage.P2k嘉泰姆
Current-Limit ProtectionP2k嘉泰姆
The CXSU63138 monitors the inductor current, flows through the N-channel MOSFET, and limitsP2k嘉泰姆

 the current peak at current-limit level to prevent loads and the CXSU63138 from damaging during overload or P2k嘉泰姆

short-circuit conditions.P2k嘉泰姆

Over-Temperature Protection (OTP)P2k嘉泰姆
The over-temperature circuit limits the junction tempera-ture of the CXSU63138. When the P2k嘉泰姆

junction temperature  ex-ceeds 150 oC, a thermal sensor turns off the power MOSFET allowingP2k嘉泰姆

 the devices to cool. The thermal sen-sor allows the converters to start a soft-start process and P2k嘉泰姆

regulates the output voltage again after the junction tem-perature cools by 40oC. The OTP is designed P2k嘉泰姆

with a 40oC hysteresis to lower the average Junction Temperature (TJ) during continuous thermal overloadP2k嘉泰姆

 conditions in-creasing the lifetime of the device. P2k嘉泰姆

Enable/ShutdownP2k嘉泰姆
Driving EN to the ground places the CXSU63138 in shut-down mode. When in shutdown, the internal powerP2k嘉泰姆
MOSFET turns off, all internal circuitry shuts down, and the quiescent supply current reduces to 1μA maximum.P2k嘉泰姆
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