Southchip Semicon SC8802QDER

SC8802 is a synchronous 4-switch bidirectional buck-boost charge/discharge controller. Regardless of whether the input voltage is lower than, higher than, or equal to the battery pack voltage, it can manage battery pack charging, including trickle, constant current, constant voltage phases, and full-charge indication. When the system needs to discharge from the battery pack, the SC8802 can output the required voltage in reverse — below, above, or equal to the battery pack voltage.

The SC8802 features an ultra-wide input/output voltage range, supporting applications from 2.7V to 30V to meet customer needs for 1 to 6 lithium battery cells. It also adopts an industry-leading 10V gate driver voltage to fully utilize external power MOSFETs for maximum conversion efficiency.

The SC8802 employs current-mode control for boost, buck, or buck-boost operation. Switching frequency, battery voltage setpoint, and input/output current limits are all adjustable via external resistors, simplifying design while accommodating diverse application requirements.

The SC8802 supports bidirectional output with operating direction easily controlled via the DIR pin. It also supports a comprehensive set of protection features — including input current limiting, output current limiting, dynamic input power adjustment, internal peak current limiting, output overvoltage protection, short-circuit protection, and overtemperature protection — ensuring the system can handle various abnormal conditions.

The SC8802 is available in a 32-pin 4×4 QFN package.

The SC8802 is a 4-switch synchronous buck-boost controller supporting bidirectional buck-boost operation, with charge/discharge mode controlled via the DIR pin.

In charging mode, the SC8802 functions as a charger controller. Regardless of whether the adapter voltage is lower or higher than the battery voltage, the SC8802 can charge the battery, automatically and seamlessly switching between boost charging and buck charging. It provides full charging management including trickle charge, constant current, constant voltage, and full-charge indication. Charge current is resistor-programmable and supports dynamic adjustment. The SC8802 also supports adapter auto-detection, automatically reducing charge current to prevent adapter overload.

In discharge mode, thanks to the 4-switch synchronous buck-boost topology, the SC8802 output voltage can be higher than, lower than, or equal to the battery voltage. The SC8802 automatically switches between buck and boost with seamless transitions, and input/output maximum current limits are resistor-programmable. Combined with a fast-charging or USB PD protocol IC, fast charging or PD solutions can be easily implemented.

• Bidirectional operation
• Buck-boost charging management (trickle, constant current, constant voltage, and full-charge indication), supports 1 to 6 lithium battery cells
• Buck-boost reverse discharge output
• Reverse output voltage dynamic adjustment via PWM signal
• Input/output current dynamic adjustment via PWM signal
• Ultra-wide input voltage range: 2.7V to 30V
• Ultra-wide reverse output voltage range: 2V to 30V
• Integrated 10V, 2A gate driver
• High-efficiency buck-boost operation
• Adjustable switching frequency: 200kHz to 600kHz
• Built-in inductor current limiting
• Adjustable input/output current limiting, dual-sided output short-circuit protection
• Under-voltage and over-voltage protection
• QFN-32 package

• Power banks
• Smart USB outlets, USB HUBs
• USB PD
• Car chargers
• Energy recovery, industrial instrumentation, etc.