RT9259
12V Synchronous Buck PWM DC-DC and
Linear Power Controller
General Description
The RT9259 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 VQFN-16L 4x4, SOP14 and SSOP-16
packages.
Features
Single 12V Bias Supply
Support Dual Channel Power Conversion
One Synchronous Rectified Buck PWM Controller
One Linear Controller
Both Controllers Drive Low Cost N-MOSFETs
Adjustable Frequency from 150kHz to 1MHz
and Free-Run Frequency at 230kHz
Small External Component Count
Output Voltage Regulation
PWM Controller :
±
1% Accuracy
LDO Controller :
±
2% Accuracy
Two Internal V
REF
Power Support Lower to 0.8V
Adjustable External Compensation
Linear Controller Drives N-MOSFET Pass
Transistor
Fully-Adjustable Outputs
Under Voltage Protection for Both Outputs
Over Current Fault Monitor on MOSFET; No Current
Sense Resistor is Required.
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9259
Package Type
S : SOP-14
A : SSOP-16
QV : VQFN-16 4x4 (V-Type)
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.
Applications
Graphic Card GPU, Memory Core Power
Graphic Card Interface Power
Motherboard, Desktop and Servers Chipset and Memory
Core Power
IA Equipments
Telecomm Equipments
High Power DC-DC Regulators
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
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
