2.7V至6V输入电压CXSU63138固定的开关频率1.5MHz电流模式N沟道MOSFET的升压调节器内置软启动

目录

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

一,产品概述(General Description)         

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

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

dam-age in the event of an output overload
二.产品特点(Features)

1.)Wide 2.7V to 6V Input Voltage Range
2.)Built-in 0.2Ω N-Channel MOSFET
3.)Built-in Soft-Start
4.)High Efficiency up to 90%
5.)<1μA Quiescent Current During Shutdown
6.)Current-Mode Operation
    Stable with Ceramic Output Capacitors
    Fast Transient Response
7.)Current-Limit Protection
8.)Over-Temperature Protection with Hysteresis
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-age
10.)Lead Free and Green Devices Available(RoHS Compliant)
三,应用范围 (Applications)

Cell Phone and Smart Phone
PDA, PMP, MP3
Digital Camera
Boost Regulators
四.下载产品资料PDF文档 

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！

五,产品封装图 (Package)

六.电路原理图

七,功能概述

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

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

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

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

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

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

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

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

current matches the new load current. 

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

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

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

the UVLO rising threshold, startup begins. When the in-put voltage falls below the UVLO falling

 threshold, the controller turns off the converter.
Soft-Start
The CXSU63138 has a built-in soft-start to control the output voltage rise during start-up. During soft-start, an

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

reference voltage (1.23V typical) until the ramp voltage reaches the reference voltage.
Current-Limit Protection
The CXSU63138 monitors the inductor current, flows through the N-channel MOSFET, and limits

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

short-circuit conditions.

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

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

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

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

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

 conditions in-creasing the lifetime of the device. 

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