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reference designSC8742B | Demoboard SC8742B_EVM_C145

Southchip SC8742B | Demoboard SC8742B_EVM_C145

SC8742B 36V / 100W Buck-Boost Converter with Low-Side MOSFETs Integrated and I2C Interface

Overview

TopologyBuck-Boost Converter
Input voltage4-36 V
Output 122 V / 6.35 A
IC revisionV0.1.7

Description

The SC8742B 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 SC8742B operates over 3.7V to 36V wide input voltage and can output 1V to 22V voltage to support a variety of applications. The SC8742B 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 SC8742B employs current mode control scheme. The switching frequency could be set at 270kHz/405kHz/540kHz through I2C. The SC8742B also provides optional spread spectrum to optimize EMI performance. The SC8742B offers output over-voltage protection, cycle-by-cycle current limit, output short circuit protection, average output current limit and thermal shutdown protection The SC8742B is available in 20-pin 3mm X 5mm Wettable Flank QFN packages.

Features

  • Integrated gate driver for high-side power switches
  • 4V to 36V start up input voltage, support 3.7V falling Vin
  • 1V to 22V output voltage range
  • Programmable Power Supply (PPS) support for USB powerdelivery
  • 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: - 270k/405k/540kHz frequency selectable - Auto PFM / Forced PWM - Spread spectrum dithering - Line drop compensation - Current limit setting
  • IMON pin to indicate output current information
  • External biased VCC for higher efficiency
  • Output OCP / SCP / OVP / TSD protection

Typical applications

  • USB Power Delivery, Speaker, Monitor

More information

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744237701
SPECWE-CMDC Common Mode Data Line Filter, 9 µH, 700 Ω
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Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-CMDC Common Mode Data Line Filter
Inductance9 µH
Impedance700 Ω
Rated Current8 A
DC Resistance6 mΩ
Rated Voltage80 V (DC)
Winding Stylesectional 
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