RT8120K PWM Controller Datasheet

RT8120K Datasheet, PDF, Equivalent


Part Number

RT8120K

Description

Single-Phase Synchronous Buck PWM Controller

Manufacture

Richtek

Total Page 18 Pages
Datasheet
Download RT8120K Datasheet


RT8120K
®
RT8120J/K
Single-Phase Synchronous Buck PWM Controller
General Description
The RT8120J/K is a single-phase synchronous Buck PWM
DC/DC controller designed to drive two N-MOSFET. It
provides a highly accurate, adjustable output voltage
precisely regulated to low voltage requirements with an
internal 0.8V ±1% ( option for 0.6V ±1.5%) reference. The
RT8120J/K uses a single feedback loop voltage mode
PWM control for fast transient response. An oscillator with
fixed frequency 300kHz reduces the external inductor and
capacitor component size for saving space on PCB. The
RT8120J/K provides fast transient response to satisfy high
current output applications while minimizing external
components. It is suitable for high performance graphic
processors, DDR and VTT power. The RT8120J/K
incorporates an externally compensated error amplifier
and an internal soft-start and an output enable control
function. The RT8120J/K is available in the SOP-8 and
SOP-8 (Exposed Pad) packages.
Features
z Wide Input Voltage Range : 3V to 13.2V
z Embedded Switching Boot Diode
z 0.8V ±1%, 0.6V ±1.5% Internal Reference
z Shoot-Through Protection and Short Pulse Free
Technology for Gate Drivers
z Fixed Frequency 300kHz
z Internal Soft-Start
z Over Current Protection by Sensing MOSFET RDS(ON)
z Enable/Shutdown Control
z Drives Two N-MOSFETs
z Full Duty Cycle : 0% to 85%
z Fast Transient Response
z Voltage Mode PWM Control with External
Feedback Loop Compensation
z Pinless LGATE Over Current Setting (LGOCS)
z Under Voltage Protection
z SOP-8 and SOP-8 (Exposed Pad) Packages
z RoHS Compliant and Halogen Free
Applications
z System (Graphic, MB) with 5V or 12V Power
z Graphic Cards (AGP 8X, 4X, PCI Express*16)
z 3.3V to 12V Input DC/DC Regulators
z Low Voltage Distributed Power Supplies
Simplified Application Circuit
RT8120J/K
VCC
VCC
BOOT
UGATE
COMP/EN
PHASE
FB
LGATE/
OCSET
GND
VIN
VOUT
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8120J/K-00 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT8120K
®
RT8120J/K
Ordering Information
RT8120J/K
Package Type
S : SOP-8
SP : SOP-8 (Exposed-Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Reference Voltage
J : 0.6V
K : 0.8V
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Pin Configurations
(TOP VIEW)
BOOT
UGATE
GND
LGATE/OCSET
2
3
4
8 PHASE
7 COMP/EN
6 FB
5 VCC
SOP-8
BOOT
UGATE
GND
LGATE/OCSET
8
27
GND
36
9
45
PHASE
COMP/EN
FB
VCC
SOP-8 (Exposed Pad)
Marking Information
RT8120xGS
RT8120x
GSYMDNN
RT8120xGS : Product Number
x : G or H
YMDNN : Date Code
RT8120xGSP
RT8120x
GSPYMDNN
RT8120xGSP : Product Number
x : G or H
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8120J/K-00 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2


Features ® RT8120J/K Single-Phase Synchronous B uck PWM Controller General Description The RT8120J/K is a single-phase synchr onous Buck PWM DC/DC controller designe d to drive two N-MOSFET. It provides a highly accurate, adjustable output volt age precisely regulated to low voltage requirements with an internal 0.8V ±1% ( option for 0.6V ±1.5%) reference. T he RT8120J/K uses a single feedback loo p voltage mode PWM control for fast tra nsient response. An oscillator with fix ed frequency 300kHz reduces the externa l inductor and capacitor component size for saving space on PCB. The RT8120J/K provides fast transient response to sa tisfy high current output applications while minimizing external components. I t is suitable for high performance grap hic processors, DDR and VTT power. The RT8120J/K incorporates an externally co mpensated error amplifier and an intern al soft-start and an output enable cont rol function. The RT8120J/K is availabl e in the SOP-8 and SOP-8 (Exposed Pad) packages. Features z Wide .
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