RT9259

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 VREF 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




Application

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




Pinout








Specifications

􀁺 Supply Voltage, V_CC ---------------------------------------------------------------------------------- 15V
􀁺 PHASE to GND
DC---------------------------------------------------------------------------------------------------- −5V to 15V
< 200ns ------------------------------------------------------------------------------------------- −10V to 30V
􀁺 BOOT to PHASE ----------------------------------------------------------------------------------------- 15V
􀁺 BOOT to GND
DC------------------------------------------------------------------------------------------- −0.3V to V_CC+15V
< 200ns ------------------------------------------------------------------------------------------- −0.3V to 42V
􀁺 UGATE ------------------------------------------------------------------ V_PHASE − 0.3V to V_BOOT + 0.3V
􀁺 LGATE -------------------------------------------------------------------------- GND − 0.3V to V_CC + 0.3V
􀁺 DRV ----------------------------------------------------------------------------- GND − 0.3V to VCC + 0.3V
􀁺 Input, Output or I/O Voltage ---------------------------------------------------------- GND − 0.3V to 7V
􀁺 Power Dissipation, PD @ TA = 25°C
SOP-14 --------------------------------------------------------------------------------------------------- 1.000W
SSOP-16 -------------------------------------------------------------------------------------------------- 0.909W
VQFN-16L 4x4 ------------------------------------------------------------------------------------------- 1.852W
􀁺 Package Thermal Resistance (Note 4)
SOP-14, JA ------------------------------------------------------------------------------------------- 100°C/W
SSOP-16, JA ------------------------------------------------------------------------------------------ 110°C/W
VQFN-16L 4x4, JA ------------------------------------------------------------------------------------- 54°C/W
􀁺 Junction Temperature -------------------------------------------------------------------------------- 150°C
􀁺 Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------- 260°C
􀁺 Storage Temperature Range ---------------------------------------------------------- −40°C to 150°C
􀁺 ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------- 200V




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.