一 概述；

        PL5501 is a synchronous 4-switch Buck-Boost controller capable of regulating the output voltageat above or below the input voltage. PL5501 operatesover a wide input voltage range of 3.6 V to 32 V(36Vmaximum) to support a variety of applications. PL5501 employs Constant ON time control inbuck, boost and buck-boost operation modes for superior load and line regulation. The switching frequencycould be set to 150kHz, 300kHz, 600kHz or 1200kHzbased on different resistor value between FREQpinand GND pin. The device also featuresaprogrammable soft-start function and offers all kindsof protection features including cycle-by-cycle current limiting, input under voltage lockout (UVLO), output over voltage protection (OVP), input Over VoltageProtection, thermal shutdown and output short protection etc. VADJ, IADJ pins are used to programoutput VBUSvoltage and output current limit, provides voltagecontrol loop, constant current loop, thermal regulationloop, temperature sensing, which makes PL5501an excellent option for USB Power Delivery (PD) application.

二 特性

   Buck-Boost Controller for Step-Up/Step-Down DC/DC Conversion 

 Dynamical programming of Output current and Output voltage using PWM signal or analog signal  2V to 32 V wide output range

 Comprehensive protection features including Output Short Protection (OSP), Cycle-by-Cycle input and output Peak Current Limit, thermal regulation, thermal shutdown, input UVLO, input OVP, output OVP etc.

 Adjustable Switching Frequency using resistor

 Frequency dithering for good EMI performance

 Integrated 2-A MOSFET Gate Drivers

 Input or Output Average Current Limiting with stable CC loop

 5V/55mA low Iq LDO to power system MCU

Available in QFN4x4-32 Package

三 应用

Automotive Start-Stop Systems  Industrial PC Power Supplies  USB Power Delivery  Car charger  HUB Power