Controller IC Chip - RT8231BGQW RT8231B ( 3T=** ) QFN20 Chip for laptop - Integrated Laptop Chip (Code 1-CHIP0949)

Controller IC Chip - RT8231BGQW RT8231B ( 3T=** ) QFN20 Chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0949)

The RT8231A/B provides a complete power supply forDDR2/DDR3/DDR3L/LPDDR3/DDR4/LPDDR4 memorysystems. It integrates a synchronous PWM Buckcontroller with a 1.5A sink/source tracking linear regulatorand buffered low noise reference.The PWM controller provides the low quiescent current,high efficiency, excellent transient response, and high DCoutput accuracy needed for stepping down high-voltagebatteries to generate low-voltage chipset RAM suppliesin notebook computers. The constant on-time PWMcontrol scheme handles wide input/output voltage ratioswith ease and provides 100ns “instant-on” response toload transients while maintaining a relatively constantswitching frequency.The RT8231A/B achieves high efficiency at a reduced costby eliminating the current-sense resistor found intraditional current mode PWMs. Efficiency is furtherenhanced by its ability to drive very large synchronousrectifier MOSFETs. The Buck conversion allows this deviceto directly step down high-voltage batteries for the highestpossible efficiency.The 1.5A sink/source LDO maintains fast transientresponse only requiring a 10mF ceramic output capacitor.In addition, the LDO supply input is available externallyto significantly reduce the total power losses. The RT8231A/B supports all of the sleep state controls placingVTT at high-Z in S3 and discharging VDDQ, VTT andVTTREF (soft-off) in S4/S5.The RT8231A/B provides protections including OVP, UVP,and thermal shutdown. The RT8231A/B is available in theWQFN-20L 3x3 package.

PWM Controller Adjustable Current Limit with Low-Side RDS(ON)Sensing Low Quiescent Supply Current Quick Load-Step Response within 100ns 1% VVDDQ Accuracy Over Line and Load Adjustable 0.675V to 3.3V Output Range for 1.8V(DDR2), 1.5V (DDR3), 1.35V (DDR3L), 1.2V (LPDDR3),1.2V (DDR4) and 1.1V (LPDDR4) 4.5V to 26V Battery Input Range Resistor Adjustable Frequency Over-/Under-Voltage Protection Internal Voltage Ramp Soft-Start Drives Large Synchronous Rectifier MOSFETs Power Good Indicator1.5A LDO (VTT), Buffered Reference (VTTREF) Capable to Sink and Source Up to 1.5A LDO Input Available to Optimize Power Losses Requires Only 10μμμμmF Ceramic Output Capacitor Integrated Divider Tracks 1/2 VDDQ for both VTTand VTTREF Accuracy ±±±±±20mV for both VTTREF and VTT Supports High-Z in S3 and Soft-Off in S4/S5RoHS Compliant and Halogen Free

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