RT9259 Datasheet, PDF (1/15 Pages) Richtek Technology Corporation – 12V Synchronous Buck PWM DC-DC and Linear Power Controller

RT9259
12V Synchronous Buck PWM DC-DC and
Linear Power Controller
General Description
Features
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.
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.
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-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-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.
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
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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