SC1881C 36V / 140W Buck-Boost Converter with Low-Side
MOSFETs Integrated and I2C Interface  
1 Descriptions
The SC1881C is a buck-boost converter with two low-side
integrated power switches capable of regulating the output
voltage at, above, or below the input voltage. The SC1881C
operates over 3.7V to 36V wide input voltage and can output
1V to 29V voltage to support a variety of applications.
The SC1881C is suitable for USB power delivery application.
It can work well with external USB PD controller through I2C
interface and provide flexibility of programmable features.
The SC1881C employs current mode control scheme. The
switching frequency could be set at 280kHz/420kHz/560kHz
through I2C. The SC1881C also provides optional spread
spectrum to optimize EMI performance.
The SC1881C offers output over-voltage protection, cycleby-cycle
current limit, output short circuit protection, average
output current limit and thermal shutdown protection
The SC1881C is available in 20-pin 3mm x 5mm PLQFN
packages.  
2 Features
• Integrated gate driver for high-side power switches
• 4V to 36V start up input voltage, support 3.7V falling Vin
• 1V to 29V output voltage range, 36V ABS voltage
• Programmable Power Supply (PPS) support for USB
power delivery
- Programmable reference voltage range: 0.1V –
1.123V with 1mV resolution
- Programmable output current limit up to 6.35A with
50-mA step
- +/- 5% accurate average output current limiting
• I2C Interface for:
- 280k/420k/560kHz frequency selectable
- Auto PFM / Forced PWM
- Spread spectrum dithering
- Line drop compensation
- Current limit setting
• IMON for output current
• External biased VCC for higher efficiency
• Output OCP / SCP / OVP / TSD protection  
3 Applications
• Monitor/TV
• USB Charging
• Wireless Charging
• USB HUB