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reference designSC81531Q | Demoboard SC81531Q_EVM_C163_V1.5

Southchip SC81531Q | Demoboard SC81531Q_EVM_C163_V1.5

36V/3A, Buck Converter with USB Charging Port Supporting CDP and Type-C DFP Mode, AEC-Q100 Qualified

Overview

TopologyBuck Converter
Input voltage3.8-36 V
Switching frequency200-2200 kHz
Output 120 V / 3 A
IC revisionV1.0.0

Description

SC81531Q is a USB Type-C and BC1.2 charging port controller that includes a synchronous step-down converter. It integrates a single USB current-limit switch and achieves 3A of output current across a wide input supply range, with excellent load and line regulation. SC81531Q integrates current-limited USB switch, which supports Quick Charge 3.0 mode, Apple 2.4A Divider mode, DCP schemes for BC1.2, USB Type-C 5V@3A DFP mode and Type-A mode. SC81531Q also integrates negative temperature coefficient (NTC) to monitor the external PCB or other components’ temperatures. Fault condition protections include hiccup current limiting, output over-voltage protection (OVP), DP/DM/CC1/CC2 short-to-battery protection, and thermal shutdown. The SC81531Q is available in 22-pin 4mm X 4mm Wettable Flank Flip-Chip QFN packages.

Features

  • Integrated Synchronous Buck Converter
  • 3.8V ~ 36V operating, 40V ABS MAX
  • Integrated 52.5m/30.5m MOSFETs
  • Adjustable switching frequency from 200kHz to 2.2MHz
  • Auto PFM (Forced PWM optional)
  • Frequency Synchronization
  • Spread Spectrum option
  • Support BC1.2 CDP mode
  • Support Type-C 5V@3A DFP mode
  • USB_OUT/DPDM/CC1CC2 short to battery protection
  • Integrated >1GHz high bandwidth data switch
  • Support APPLE MFI Certification
  • DP_IN/DM_IN/DP_OUT/DM_OUT/CC1/CC2 IEC 61000-4-2 rated ±8-kV contact and ±15-kV air discharge
  • Wettable Flank Flip Chip QFN-22(4mm x 4mm)

Typical applications

  • Automotive USB QC3.0 Charging Ports, Automotive USB Type-C Charging Ports, Automotive Charging Downstream Ports, Automotive USB Dedicated Charging Ports

More information

Parts approved by Southchip

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
Mount
SamplesAvailability & Sample
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74437336047
SPECWE-LHMI SMT Power Inductor, 4.7 µH, 4.35 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-LHMI SMT Power Inductor
Inductance4.7 µH
Performance Rated Current4.35 A
Saturation Current @ 10%3.85 A
Saturation Current @ 30%7.6 A
DC Resistance53 mΩ
Self Resonant Frequency25 MHz
MountSMT 
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74437368047
SPECWE-LHMI SMT Power Inductor, 4.7 µH, 9.4 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-LHMI SMT Power Inductor
Inductance4.7 µH
Performance Rated Current9.4 A
Saturation Current @ 10%11.7 A
Saturation Current @ 30%26 A
DC Resistance15.5 mΩ
Self Resonant Frequency16 MHz
MountSMT 
–Check availability