RT8105GS 查看數據表（PDF） - Richtek Technology
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RT8105GS Datasheet PDF : 12 Pages
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RT8105
5V/12V Synchronous Buck PWM DC/DC Controller
General Description
The RT8105 is a high efficiency synchronous buck PWM
controllers that generate logic-supply voltages in PC based
systems. These high performance , single output devices
include internal soft-start, frequency compensation
networks and integrates all of the control, output
adjustment, monitoring and protection functions into a
single package.
The device operating at fixed 300kHz frequency provides
an optimum compromise between efficiency, external
component size, and cost.
Adjustable over-current protection (OCP) monitors the
voltage drop across the RDS(ON) of the lower MOSFET for
synchronous buck PWM DC/DC controller. The over-
current function cycles the soft-start in 4-times hiccup
mode to provide fault protection, and in an always hiccup
mode for under-voltage protection.
Ordering Information
RT8105
Package Type
S : SOP-8
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Features
z Operating with 5V or 12V Supply Voltage
z Drives All Low Cost N-MOSFETs
z Voltage Mode PWM Control
z 300kHz Fixed Frequency Oscillator
z Fast Transient Response :
` High-Speed GM Amplifier
` Full 0 to 100% Duty Ratio
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Current Fault Monitor on MOSFET, No Current
Sense Resistor Required
z Full-Time Over Voltage Protection
z RoHS Compliant and Halogen Free
Applications
z Graphic Card
z Motherboard, Desktop Servers
z IA Equipments
z Telecomm Equipments
z High Power DC/DC Regulators
Pin Configurations
(TOP VIEW)
BOOT
UGATE
GND
LGATE
8
2
7
3
6
4
5
SOP-8
PHASE
OPS
FB
VCC
Marking Information
RT8105GS
RT8105
GSYMDNN
RT8105GS : Product Number
YMDNN : Date Code
RT8105ZS
RT8105
ZSYMDNN
RT8105ZS : Product Number
YMDNN : Date Code
DS8105-03 April 2011
www.richtek.com
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