RT9259
12V Synchronous Buck PWM DC-DC and
Linear Power Controller
General Description
Features
z Single 12V Bias Supply
The RT9259 is a dual-channelDC/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.
z Support Dual Channel Power Conversion
`One Synchronous Rectified Buck PWM Controller
`One Linear Controller
z Both Controllers Drive Low Cost N-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
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 VQFN-16L 4x4, SOP14 and SSOP-16
packages.
z Two Internal VREF Power Support Lower to 0.8V
z Adjustable External Compensation
z Linear Controller Drives N-MOSFET Pass
Transistor
z Fully-Adjustable Outputs
z Under Voltage Protection for Both Outputs
z Over Current Fault Monitor on MOSFET; No Current
Sense Resistor is Required.
Ordering Information
RT9259
z RoHS Compliant and 100% Lead (Pb)-Free
Package Type
Applications
S : SOP-14
A : SSOP-16
z Graphic CardGPU, Memory Core Power
z Graphic Card Interface Power
z Motherboard,Desktop and Servers Chipset and Memory
Core Power
QV : VQFN-16 4x4 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
z IA Equipments
Note :
z Telecomm Equipments
Richtek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
z High PowerDC-DC Regulators
`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.
DS9259-03T00 August 2007
www.richtek.com
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