目录ZNY嘉泰姆

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

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

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

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

1.)Wide 2.7V to 6V Input Voltage RangeZNY嘉泰姆
2.)Built-in 0.2Ω N-Channel MOSFETZNY嘉泰姆
3.)Built-in Soft-StartZNY嘉泰姆
4.)High Efficiency up to 90%ZNY嘉泰姆
5.)<1μA Quiescent Current During ShutdownZNY嘉泰姆
6.)Current-Mode OperationZNY嘉泰姆
    Stable with Ceramic Output CapacitorsZNY嘉泰姆
    Fast Transient ResponseZNY嘉泰姆
7.)Current-Limit ProtectionZNY嘉泰姆
8.)Over-Temperature Protection with HysteresisZNY嘉泰姆
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-ageZNY嘉泰姆
10.)Lead Free and Green Devices Available(RoHS Compliant)ZNY嘉泰姆
三,应用范围 (Applications)ZNY嘉泰姆

Cell Phone and Smart PhoneZNY嘉泰姆
PDA, PMP, MP3ZNY嘉泰姆
Digital CameraZNY嘉泰姆
Boost RegulatorsZNY嘉泰姆
四.下载产品资料PDF文档 ZNY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！ZNY嘉泰姆

 ZNY嘉泰姆

五,产品封装图 (Package)ZNY嘉泰姆

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六.电路原理图ZNY嘉泰姆

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七,功能概述ZNY嘉泰姆

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

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

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

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

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

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

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

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

current matches the new load current. ZNY嘉泰姆

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

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

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

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

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

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

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

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

short-circuit conditions.ZNY嘉泰姆

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

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

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

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

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

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

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