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Application Note: SY8286A

High Efficiency Fast Response

6A, 23V Input Synchronous Step Down Regulator

General Description Features

The SY8286A develops a high efficiency synchronous

step-down DC-DC regulator capable of delivering 6A

current. The device integrates main switch and

synchronous switch with very low R

DS(ON)

to minimize

the conduction loss.

The SY8286A operates over a wide input voltage range

from 4V to 23V. The DC-DC regulator adopts the instant

PWM architecture to achieve fast transient responses for

high step down applications and high efficiency at light

load. The device provides various protection features for

reliable operation. In addition, it operates at pseudo-

constant frequency of 600kHz to minimize the size of

inductor and capacitor.

Ordering Information

SY8286

□

(

□□

)

□

Temperature Code

Package Code

Optional Spec Code

Ordering Number Package type Note

SY8286ARAC QFN3x3-20 --

• Low R

DS(ON)

for internal switches (top/bottom):

38/19 mΩ

• Wide input voltage range: 4-23V

• Instant PWM architecture to achieve fast transient

responses

• Internal 1.3ms soft-start limits the inrush current

• Pseudo-constant frequency: 600kHz.

• 6A output current capability

• +/-1% internal reference voltage

• PFM/PWM selectable light l ad peration mode

• Optional bypass input

• Power good indicator

• Output discharge function

• Output current limit protection

• Hiccup mode output short circuit protection

• Output over voltage protection

• Input UVLO

• Ov r t mperature protection with auto recovery

• RoHS Compliant and Halogen Free

• Compact package: QFN3x3-20

Applications

• LCD-TV/Net-TV/3DTV

• Set Top Box

• Notebook

• High Power AP

Typical Applications

Figure 1 Schematic

AN_SY8286A Rev. 0.9C Silergy Corp. Confidential- Prepared for Customer Use Only 1

SY8286A

Block Diagram

Input

UVLO

Current Sense

ILMT

MODE

PWM

Control &

Current Sense

Internal

Protection

SST

Logic

OTP

0.6V

GND

BYP

3.1V

VCC

3.3V LDO

Absolute Maximum Ratings (Note 1)

IN ---------------------------------------------------------------------------------------------------------------------------------

25V

BS-LX ----------------------------------------------------------------------------------------------------------- 4V

EN, ILMT, MODE, PG, LX --------------------------------------------------------------------------------------------------

25V

VCC, FB ----------------------------------------------------------------------------------------------------------- 4V

BYP --------------------------------------------------------------------------------------------------------- 6V

Power Dissipation,

@ T

= 25°C QFN3x3-20 -------------------------------------------------------------------------------------

3.3W

Package Thermal Resistance (Note 2)

θ JA, QFN3x3-20 ------------------------------------------------------------------------------------------------

30°C/W

θ JC, QFN3x3-20 -----------------------------------------------------------------------------------------------

4.5°C/W

Junction Temperature Range ------------------------------------------------------------------------------------------------

150°C

Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------

260°C

Storage Temperature Range --------------------------------------------------------------------------------------

-65°C to 150°C

Dynamic LX voltage in 10ns duration --------------------------------------------------------------------- IN+3V to GND-5V

Recommended Operating Conditions (Note 3)

Supply Input Voltage ----------------------------------------------------------------------------------------------------

4V to 23V

Junction Temperature Range ------------------------------------------------------------------------------------- - 40°C to 125°C

Ambient Temperature Range -------------------------------------------------------------------------------------- -40°C to 85°C

AN_SY8286A Rev. 0.9C Silergy Corp. Confidential- Prepared for Customer Use Only 3

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