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一 概述；

       PL5500 is a synchronous 4-switch bidirectional Buck-Boost controller capable of regulatingtheoutput voltage at above or below the input voltage. PL5500 operates over a wide input voltage rangeof 3.6 V to 32 V (36 V maximum) to support a varietyof applications. PL5500 can operate at charger modefor 1, 2, 3, 4, 5 and 6 cells battery charge. PL5500 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 at battery dischargingmode when OTG is high, which makes PL5500anexcellent option for USB Power Delivery (PD) application. PL5500 provides voltage control loop, constant current loop, thermal regulation loop, batterytemperature sensing, which makes it a perfect solution for batter charge management.

二 特性

Bidirectional single Inductor Buck-Boost Controller for Step-Up/Step-Down DC/DC Conversion and battery charge management 

? Bidirectional buck-boost operation to support battery charging and discharging using OTG signal

? Dynamical programming of input current, Output current and Output voltage using PWM signal or analog signal

? 1 Cell to 6 Cells battery charge management

? 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

? Available in QFN4x4-32 Package

三 應用

? Automotive Start-Stop Systems ? Backup Battery and Super capacitor Charging ? Industrial PC Power Supplies ? USB Power Delivery