
- Stock: In Stock
- Brand: Unbranded
- Model: 1-CHIP0956
- SKU: 1-CHIP0956
Realtime Stock
Controller IC Chip - RT8248AGQW RT8248A ( 5E=** ) QFN 20 Chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0956)
The RT8248A provides a complete power supply 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. The PWM controller provides the low quiescent current, high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low-voltage chipset RAM supplies in notebook computers. The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on†response to load transients while maintaining a relatively constant switching frequency. The RT8248A achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The Buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. The 1.5A sink/source LDO maintains fast transient response only requiring a 10mF ceramic output capacitor. In addition, the LDO supply input is available externally to significantly reduce the total power losses. The IC supports all of the sleep state controls placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4/S5.
PWM Controller ï½ Adjustable Current Limit with Low-Side RDS(ON) Sensing ï½ Low Quiescent Supply Current ï½ Quick Load-Step Response within 100ns ï½ 1% VVDDQ Accuracy Over Line and Load ï½ 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) ï½ 4.5V to 26V Battery Input Range ï½ Resistor Adjustable Frequency ï½ Over-/Under-Voltage Protection ï½ Internal Voltage Ramp Soft-Start ï½ Drives Large Synchronous Rectifier MOSFETs ï½ Power Good Indicator ï¬ 1.5A LDO (VTT), Buffered Reference (VTTREF) ï½ Capable to Sink and Source Up to 1.5A ï½ LDO Input Available to Optimize Power Losses ï½ Requires Only 10mF Ceramic Output Capacitor ï½ Integrated Divider Tracks 1/2 VDDQ for both VTT and VTTREF ï½ Accuracy ±20mV for both VTTREF and VTT ï½ Supports High-Z in S3 and Soft-Off in S4/S5
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