SY21565TTC (SY8665TTC)

High Efficiency, 28V Input USB PD PMIC

SY21565TTC High Efficiency, 28V Input USB PD PMIC Datasheet

Parameters
Features
Description

Part number	SY21565TTC
Vin (min) (V)	4.5
Vin (max) (V)	28
Channel(#)	2
Application	USB power delivery/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: 23 mΩ

-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

SY21565TTC 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

Photo of evaluation board
Photo of evaluation board
Photo of evaluation board

EVB_SY21565TTC

EVB File

EVB_SY21565TTC is intended for evaluating 4.5-28V Input, 5A PMIC for USB power delivery applications.

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12