RT8231BGQW Product Information

Product Overview

The RT8231BGQW is a complete power supply controller designed for DDR2/DDR3/DDR3L/LPDDR3/DDR4/LPDDR4 memory systems. It integrates a synchronous PWM Buck controller with a 1.5A sink/source tracking linear regulator and buffered low noise reference. Manufactured by Richtek Technology Corporation, this device is optimized for high efficiency and excellent transient response in notebook computers and other applications requiring low-voltage chipset RAM supplies.

Features

• PWM Controller: Provides low quiescent current, high efficiency, excellent transient response, and high DC output accuracy.
• Constant On-Time PWM Control: Handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients.
• High Efficiency: Achieved by eliminating the current-sense resistor found in traditional current mode PWMs.
• 1.5A Sink/Source LDO: Maintains fast transient response with only a 10μF ceramic output capacitor.
• Over-Voltage Protection (OVP) and Under-Voltage Protection (UVP): Ensures safe operation.
• Thermal Shutdown: Protects the device from overheating.
• Power Good Indicator: Indicates when the output voltage is within the target range.
• RoHS Compliant and Halogen Free: Suitable for environmentally conscious applications.

Pin Configuration

Pin Diagram (TOP VIEW)

TableCopy

Functional Block Diagram

Buck Controller

• TRIG↑: Trigger signal for the high-side MOSFET.
• VDDQO-: Output voltage for VDDQ.
• BOOT: Bootstrap supply for the high-side gate driver.
• TON: One-shot timer for setting the on-time.
• Comp: Comparator for feedback control.
• R: Resistor for setting the on-time.
• VREF: Reference voltage.
• UGATE: High-side gate driver output.
• PHASE: Switch node.
• LGATE: Low-side gate driver output.
• PGND: Power ground for low-side MOSFET.
• CS: Current limit threshold setting input.
• PGOOD: Power good open-drain output.
• VID: Internal reference voltage setting.
• VDD: Supply voltage input for the analog supply and LGATE gate driver.

VTT LDO

• VDDQ: Reference input for VTT and VTTREF.
• S3: VTT LDO enable control input.
• S5: PWM enable control input.
• TON: One-shot timer for setting the on-time.
• PGOOD: Power good open-drain output.
• VID: Internal reference voltage setting.
• VDD: Supply voltage input for the analog supply and LGATE gate driver.
• CS: Current limit threshold setting input.
• PGND: Power ground for low-side MOSFET.
• LGATE: Low-side gate driver output for VDDQ.
• PHASE: Switch node.
• UGATE: High-side gate driver output for VDDQ.
• BOOT: Bootstrap supply for the high-side gate driver.
• VLDOIN: Power supply for VTT LDO.
• VTT: Power output for the VTT LDO.
• VTTSNS: Voltage sense input for the VTT LDO.
• VTTGND: Power ground for the VTT LDO.

Applications

• DDR2/DDR3/DDR3L/LPDDR3/DDR4/LPDDR4 Memory Power Supplies
• Notebook computers
• SSTL18, SSTL15, and HSTL bus termination