Conceptual
1
DS8110-01C March 2007 www.richtek.com
RT8110
Pin Configurations
(TOP VIEW)
SOT-23-8
Ordering Information
Note :
RichTek Pb-free and Green 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.
`100% matte tin (Sn) plating.
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Wide Range Input Voltage Simple Synchronous DC/DC
Converter
General Description
The RT8110 is a single power supply PWM DC-DC
controller designed to drive N-MOSFET in a synchronous
buck topology. The IC integrates the control, output
adjustment, monitor and protection functions in a small
8-pin package.
The RT8110 uses an internal compensation high DC gain
voltage mode PWM control for simple application design.
An internal 0.8V reference allows the output voltage to be
precisely regulated for low voltage requirement. A fixed
400kHz oscillator reduces the component size for saving
board space.
The RT8110 features over current protection, and under
voltage lock-out. The output current is monitored by
sensing the voltage drop across the Low side MOSFET's
R
DS(ON)
, which eliminates the need for a current sensing
resistor.
Features
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zz
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Wide Input Operation Voltage 5V to 23V
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z 0.8V Internal Reference
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z Drive Two N-MOSFETs
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z High DC gain Voltage Mode PWM Control
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z Fast Transient Response
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z Fixed 400kHz Oscillator Frequency
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z Fully Dynamic 0 to 80% Duty Cycle
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z Internal Soft Start
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z Adaptive Non-Overlapping Gate Driver
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z Over-Current Protection Under Voltage Lockout
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z RoHS Compliant and 100% Lead (Pb)-Free
RT8110
Package Type
V8 : SOT-23-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
-
Note : There is no pin1 indicator on top mark for SOT-23-8
type, and pin 1 will be lower left pin when reading top mark
from left to right.
Applications
z Motherboard Power Regulation for Computers
z Subsystems Power Supplies
z Cable Modems, Set Top Boxes, and DSL Modems
z DSP and Core Communication processor Supplies
z Memory Power Supplies
z Personal Computer Peripherals
z Industrial Power Supplies
z 5V-Input DC-DC Regulators
z Low Voltage Distributed Power Supplies
BOOT
FB
VCC
PHASE
GND
LGATE
DRIVE
UGATE
5
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1
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