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SY8665DTTQ

Production
High Efficiency, 28V Input USB PD PMIC
Datasheet
SY8665DTTQ High Efficiency, 28V Input USB PD PMIC Datasheet
Part number SY8665DTTQ
Vin (min) (V) 4.5
Vin (max) (V) 28
Channel(#) 2
Application Notebook/Monitor/Desktop
Features 5A buck regulator, an external PMOS driver and an external NMOS driver to realize power path control
Package QFN3×3-19
• 4.5-28V Wide Input Voltage Range
• Bidirectional Power Path Control
• 5A Buck Regulator
    - Low RDS(ON) Internal Switch: HSFET: 33mΩ, LSFET: 23mΩ
    - I2C Programmable Output Range from 3.0V to 21V in 200mV Per Step
    - Cable Impedance Compensation
    - Selectable Switching Frequency: 250kHz/500kHz/750kHz/1MHz
    - Internal Soft-Start Limits the Input Inrush Current
    - Output OCP, SCP, OVP
• External NFET Driver for Reverse Blocking
• External PFET Driver for Power Bypass
• I2C Compatible Interface
• Support Interrupt for Status Feedback
• Programmable Discharge  
• Programmable Current Limit
• Thermal Shutdown Protection
• Compact Package QFN3x3-19
• UL Certificate Number: E491480
• UL 2367 Certified
•  IEC/ EN 62368-1 Certified

The SY8665DTTQ is a wide input voltage range, high efficiency PMIC for USB power delivery applications. The device integrates a 5A buck regulator, an external P-MOSFET driver and an external NMOS driver to achieve power path control. 

The buck regulator adopts fixed switching frequency peak current mode control. The output voltage can be either configured by the I2C interface from 3.0V to 21V in 200mV per step or programmed by the FB pin. With high switching frequency and low RDS (ON) power switches, the device is able to achieve both small size and high efficiency solution.

The device integrates an I2C compatible interface for mode selecting, output voltage setting, frequency setting, protection setting, etc.

The device is available in compact QFN3x3-19.

Evaluation Board

  • SY8665D_1

    Photo of evaluation board

  • SY8665D_2

    Photo of evaluation board

  • SY8665D_3

    Photo of evaluation board

EVB_SY8665DTTQ

The EVB_SY8665DTTQ is intended for evaluating high efficiency, 28V input USB PD PMIC.

Technical Documentation

Title Date
Silergy_Catalog_Q2_2026 2026-06-12