描述：

The XL4013 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 4A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 180KHz to 48KHz. An internal compensation block is built in to minimize external component count.

优势特点：

Wide 8V to 36V Input Voltage Range n

Output Adjustable from 1.25V to 32V n

Maximum Duty Cycle 100% n

Minimum Drop Out 0.3V n

Fixed 180KHz SwitchingFrequency n

4A Constant Output Current Capability n

Internal Optimize Power MOSFET n

High efficiency n

Excellent line and load regulation n

Built in thermal shutdown function n

Built in current limit function n

Built in output short protection function n

Available in TO-252 package

应用领域：

LCD Monitor and LCD TV n

Portable instrument power supply n

Telecom / Networking Equipment

XL4012大电流12A PWM  DC/DC  TO220输入3.6-25V  输出0.8V-23V转换效率高达95%(功能兼容)完全替代LM2677  LM2678 LM2679

XL4012 大电流  12A  PWM *DC/DC

（一）输入3.6-25V  ，输出0.8V-23V转换效率高达95%

(功能兼容)LM2677 LM2678 LM2679

XL4012 输入电压范围可由3.6伏特--30伏特,输出电压0.8V--23V可调整且输出电流可高达12A,非常适合于大尺寸液晶电视 电子 工业控制供电 智能安防 网络通讯等设备的电压转换.
XL4012应用电路非常简单,外围器件，其内部具有完整的系统保护 功能包括可调式软启动(adjustable soft-start)，短路保护(SCP)， 过温度保护(OTP)及可调式过电流保护(adjustable OCP)功能,切换频率固定为260KHz.XL4012采用标准的TO-220-5L无铅封装,可以兼容IC型号有:LTC3610  LTM4601

XL1507完全兼容Pin to PinAP1507

XL1509完全兼容Pin to PinAP1509

XL2576完全兼容Pin to PinLM2576  LM2575

XL2576P完全兼容Pin to PinGL2576P LM2575

XL2596完全兼容Pin to PinLM2596 AP1501  MIC4576 AP1506

是***型开关稳压器，具有非常小的电压调整率和电流调整率，能够输出3.3V 5V 12V 固定电压和可调节电压输出方式，在规定的输入电压和输出负载的条件下，XL系列产品输出电压的误差范围为±4％；振荡器的振荡频率误差范围为±10％；典型的待机电流为70μA 芯片内置过流保护电路和过热保护电路。

220V-50Hz 生活用电经*整流成4.5V~40V 直流电源为系统供电，经XL1507 XL1509 XL2576 XL2576P XL2596*得到稳定的电源，可根据不同应用改变R1 R2 的比例关系，从而使输出电压VOUT 可灵活变化 如R1=1K R2=3K 则输出电压为4.92V XL1507/XL1509/XL2576/XL2576P/XL2596 采用TO-252 TO220 和TO263封装，可PIN 对PIN 替换完全XL1507完全兼容Pin to PinAP1507

XL1509完全兼容Pin to PinAP1509

XL2576完全兼容Pin to PinLM2576 LM2575

XL2576P完全兼容Pin to PinGL2576P LM2575

XL2596完全兼容Pin to PinLM2596  AP1501  MIC4576 AP1506

优点：1、输入、输出电压范围宽；

（二）IC 内部CV，OVP 通过PWM 控制，输出电压，输出过压保护更高，响应速度更快，内置过流、过热保护，安全性更高；

（三）外围元件少，低纹波。输入25V 电压，输出12V 情况下，效率可达到90%。

其他几款同类型的芯片为：XL1509 XL2576 XL2576P XL2596