Down Regulator. SY8286A Datasheet

SY8286A Regulator. Datasheet pdf. Equivalent

SY8286A Datasheet
Recommendation SY8286A Datasheet
Part SY8286A
Description Synchronous Step Down Regulator
Feature SY8286A; Application Note: SY8286A High Efficiency Fast Response 6A, 23V Input Synchronous Step Down Regulato.
Manufacture Silergy
Datasheet
Download SY8286A Datasheet




Silergy SY8286A
Application Note: SY8286A
High Efficiency Fast Response
6A, 23V Input Synchronous Step Down Regulator
General Description
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 RDS(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 (□□)
Tempera ture Code
Packa ge Code
Optional Spec Code
Ordering Number Package type Note
SY8286ARAC QFN3x3-20
--
Typical Applications
Features
Low RDS(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 load operation 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
Over temperature 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
AN_SY8286A Rev. 0.9C
Figure 1 Schematic
1



Silergy SY8286A
Pinout (top view)
SY8286A
(QFN3x3-20)
Top Mark: AWRxyz, (Device code: AWR, x=year code, y=week code, z= lot number code)
Pin Name
BS
IN
LX
GND
PG
NC
EN
MODE
ILMT
FB
BYP
VCC
Pin Number
1
2,3,4,5
6,19,20
7,8,18,EP
9
10, 16
11
12
13
14
15
17
Pin Description
Boot-strap pin. Supply high side gate driver. Decouple this pin to LX pin with
0.1uF ceramic capacitor.
Input pin. Decouple this pin to GND pin with at least 10uF ceramic cap
Inductor pin. Connect this pin to the switching node of inductor
Ground pin
Power good Indicator. Open drain output when the output voltage is within 90% to
120% of regulation point.
Not connected
Enable pin. Pull this pin high to turn on IC. Do not leave this pin floating.
Operating mode selection under light load. Pull this pin low for PFM operating,
and pull this pin high for PWM operation. Do not leave this pin floating
Output current limit threshold selection.
Output feedback pin. Connect to the center point of resistor divider.
External 3.3V bypass power supply input. Decouple this pin to GND with a 1uF
ceramic capacitor. Leave this pin floating if it is not used.
Internal 3.3V LDO output. Power supply for internal analog circuits and driving
circuit. Decouple this pin to GND with a 2.2uF ceramic capacitor.
AN_SY8286A Rev. 0.9C Silergy Corp. Confidential- Prepared for Customer Use Only 2



Silergy SY8286A
Block Diagram
PG
EN
ILMT
MODE
FB
BYP
SY8286A
Input
UVLO
IN
Current Sense
BS
Internal
SST
OTP
0.6V
PWM
Control &
Protection
Logic
Current Sense
3.1V
IN
3.3V LDO
LX
GND
VCC
Absolute Maximum Ratings (Note 1)
IN --------------------------------------------------------------------------------------------------------------------------------- 25V
BS-LX ----------------------------------------------------------------------------------------------------------- 4V
EN, ILMT, MODE, PG, LX -------------------------------------------------------------------------------------------------- 25V
VCC, FB ----------------------------------------------------------------------------------------------------------- 4V
BYP --------------------------------------------------------------------------------------------------------- 6V
Power Dissipation,
PD @ TA = 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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