RT9232A

Features:

· Single IC Supply Voltage: 12V
· Single phase DC/DC Buck Converter with
− High Output Current (up to 25A )
− Low Output Voltage (down to 0.8V )
− High Input Voltage (up to 12V )
· Operate from 12V, 5V or 3.3V Input
· 0.8V ± 1% Internal Reference
· Adaptive Non-Overlapping Gate Drivers
· Integrated High-Current, HV Gate Drivers
· External Programmable Soft Start
· External Programmable Frequency (Range: 50kHz to 800kHz, 200kHz Free Run )
· Integrated Output Short Circuit Protection
· On/Off Control by Enable Pin
· Drives Two N-Channel MOSFET
· Full 0 to 100% Duty Cycle
· Fast Transient Response
· Voltage Mode PWM Control with External Feedback Loop Compensation
· RoHS Compliant and 100% Lead (Pb)-Free




Application

` System (Graphic, MB) with 12V Power.
` Graphic Cards (AGP 8X, 4X, PCI Express*16):
High-Current for High-Performance Graphic Processors (GPU, VPU)
Middle Current for High-Performance Graphic Memory Power (DDR, DDR II)
Low Current with Sink Capacity for High-Performance Graphic Memory Power (DDR/VTT)
` 3.3V ~ 12V Input DC-DC Regulators
` Low Voltage Distributed Power Supplies




Pinout






Specifications

` Supply Input Voltage, VCC, PVCC----------------------------------------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
` SS, FB, COMP, RT -------------------------------------------------------- 6V
` Input, Output or I/O Voltage --------------------- GND−0.3V to V_CC+ 0.3V
` Package Thermal Resistance (Note 4)
SOP-14, JA ------------------------------------------------------100°C/W
` Lead Temperature (Soldering, 10 sec.) ---------------------------- 260°C
` Junction Temperature ---------------------------------------------- 150°C
` Storage Temperature Range --------------------------- −65°C to 150°C
` ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------2kV
MM (Machine Mode) -------------------------------------------------- 200V




Description

The RT9232A is a single-phase synchronous buck PWM DC-DC converter controller designed to drive two N-Channel MOSFET. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirement with an internal 0.8V ± 1% reference.
The RT9232A uses an external compensated, single feedback loop voltage mode PWM control for fast transient response. An oscillator with Programmable frequency (50kHz to 800kHz) reduces the external inductor and capacitor component size for saving PCB board area.
The RT9232A provides fast transient response to satisfy high current output applications (up to 25A) while minimizing external components. It is suitable for high-performance graphic processors, DDR and VTT power.
The RT9232A integrates complete protect functions such as Soft Start, Output Enable, UVLO(under-voltage lockout) into a small 14-pin package.