RT9259A Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – 12V Synchronous Buck PWM DC-DC and Linear Power Controller

RT9259A
12V Synchronous Buck PWM DC-DC and Linear Power
Controller
General Description
Features
The RT9259A is a dual-channel DC/DC controller
specifically designed to deliver high quality power where
12V power source is available. This part consists of a
synchronous buck controller and an LDO controller. The
synchronous buck controller integrates MOSFET drivers
that support 12V+12V bootstrapped voltage for high
efficiency power conversion. The bootstrap diode is built-
in to simplify the circuit design and minimize external part
count. The LDO controller drives an external N-MOSFET
for lower power requirement.
Other features include adjustable operation frequency,
internal soft start, under voltage protection, over current
protection and shut down function. With the above
functions, this part provides customers a compact, high
efficiency, well-protected and cost-effective solution. This
part comes to SOP-14 package.
Ordering Information
RT9259A
Package Type
S : SOP-14
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
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.
z Single 12V Bias Supply
z Support Dual Channel Power Conversion
`One Synchronous Rectified Buck PWM Controller
`One Linear Controller
z Both Controllers Drive Low Cost N-Channel
MOSFETs
z Adjustable Frequency from 150kHz to 1MHz
and Free-Run Frequency at 230kHz
z Small External Component Count
z Output Voltage Regulation
`PWM Controller : ±1% Accuracy
`LDO Controller : ±2% Accuracy
z Two Internal V_REF Power Support Lower to 0.8V
z Adjustable External Compensation
z Linear Controller Drives N-Channel MOSFET Pass
Transistor
z Fully-Adjustable Outputs
z Under Voltage Protection for Both Outputs
z Adjustable Over Current Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Graphic Card GPU, Memory Core Power
z Graphic Card Interface Power
z Motherboard, Desktop and Servers Chipset and Memory
Core Power
z IA Equipments
z Telecomm Equipments
z High Power DC-DC Regulators
Pin Configurations
(TOP VIEW)
BOOT
RT_DIS 2
COMP 3
FB 4
DRV 5
FBL 6
GND 7
14 UGATE
13 PHASE
12 _PGND
11 LGATE
10 OCSET
9 VREF
8 VCC12
SOP-14
DS9259A-02 March 2007
www.richtek.com
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