Controller IC Chip - DDR TOTAL POWER SOLUTION SYNCHRONOUS BUCK MOSFET APW8819 APW8819QA APW8819QB chip for laptop - Integrated Laptop Chip (Code 1-CHIP0309)

Controller IC Chip - DDR TOTAL POWER SOLUTION SYNCHRONOUS BUCK MOSFET APW8819 APW8819QA APW8819QB chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0309)

The APW8819 integrates a synchronous buck PWM con-troller to generate VDDQ. a sourcing and sinking LDO linear regulator to generate VTT. It provides a complete power supply for DDR2 and DDR3 memory system. It offers the lowest total solution cost in system where space is at a premium. The APW8819 provides excellent transient response and accurate DC voltage output in PFM Mode. In Pulse Fre-quency Mode (PFM). the APW8819 provides very high ef-ficiency over light to heavy loads with loading-modulated switching frequencies. The APW8819 is equipped with accurate current-limit. output under-voltage, and output over-voltage protections. A Power-On- Reset function monitors the voltage on VCC prevents wrong operation during power on. The LDO is designed to provide a regulated voltage with bi-directional output current for DDR-SDRAM termination. The device integrates two power transistors to source or sink current up to 1.5A. It also incorporates current-limit and thermal shutdown protection. An internal resistor divider is used to provide a half volt-age of VDDQSNS for VTTREF and VTT Voltage. The VTT output voltage is only requiring 20xF of ceramic output capacitance for stability and fast transient response. The S3 and S5 pins provide the sleep state for VTT (S3 state) and suspend state (S4/S5 state) for device. when S5 and S3 are both pulled low the device provides the soft-off for VTT and VTTREF.The APW8819 is available in 3mmx3mm 20-pin QFN and 3mmx3mm 16-pin TQFN packages.

Buck Controller (VDDQ) • High Input Voltages Range from 3V to 28V Input Power • Provide 1.8V (DDR2), 1.5V (DDR3) or Adjustable Output Voltage from 0.5V to 2V - ±1% Accuracy Over-Temperature Build in VREF Voltage 1.8V ±1% Accuracy over Temperature Integrated MOSFET Drivers • Integrated Bootstrap Forward P-CH MOSFET • Excellent Line and Load Transient Responses • PFM Mode for Increased Light Load Efficiency • Selectable 300kHz/400kHz1500kHz Switching Frequebcies • Integrated MOSFET Drivers and Bootstrap Diode • S3 and S5 Pins Control The Device in SO, S3, or S4/S5 State • Power Good Monitoring • 50% Under-Voltage Protection (UVP) • 125% Over-Voltage Protection (OVP) • Adjustable Current-Limit Protection - Using Sense Low-Side MOSFET QFN-20 3mmx3mm Package (QFN-20) and QFN-16 3mmx3mm Thin Package (TQFN-16) Lead Free Available (RoHS Compliant) +1.5A LDO Section (VII) • Souring or Sinking Current up to 1.5A • Fast Transient Response for Output Voltage • Output Ceramic Capacitors Support at Least 10xF MLCC VII and VTTREF Track at Half the VDDQSNS by Internal Divider • ±20mV Accuracy for VII and VTTREF • Independent Over-Current-Limit (OCL) • Thermal Shutdown Protection

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