Controller IC Chip - SYNCHRONOUS BUCK CONTVERTER MOSFET APW8861QBI APW8861 chip for laptop - Integrated Laptop Chip (Code 1-CHIP0311)

Controller IC Chip - SYNCHRONOUS BUCK CONTVERTER MOSFET APW8861QBI APW8861 chip for laptop- Integrated portable calculator chip(SKU.1-CHIP0311)

The APW8861 integrates a synchronous buck PWM con-verter to generate VDDQ. a sourcing and sinking LDO linear regulator to generate VIT. It offers the lowest total solution cost in system where space is at a premium. The APW8861 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the APW8861 provides very high efficiency over light to heavy loads with loading-modulated switching frequencies. On TQFN-32 Package. the Forced PWM Mode works nearty at constant frequency for low-noise requirements. The APW8861 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. The output voltage of LDO tracks the voltage at VREF pin. An internal resistor divider is used to provide a half volt-age of VREF for VTIREF and VTT Voltage. The VTT output voltage is only requiring 20pF of ceramic output capaci-tance for stability and fast transient response. The S3 and S5 pins provide the sleep state for VIT (S3 state) and suspend state (S4fS5 state) for device, when S5 and S3 are both pulled low the device provides the soft-off for VTT and VTTREF.

Buck Controller (VDDO) • High Input Voltages Range from 4.5V to 2W Input Power • Provide Adjustable Output Voltage from 0.75V to 3.3V • Integrated MOSFET Drivers and Bootstrap Forward P-CHMOSFET • Low Quiescent Current (200uA) • Excellent Load Transient Responses • PFM Mode for Increased Light Load Efficiency • Constant On-Time Controller Scheme Switching Frequency Compensation for PWM Mode - Adjustable Switching Frequency from 400kHz to 550kH2 in PWM Mode with DC Output Current • 53 and 55 Pins Control The Device in SO. S3 or S4/ S5 State • PowerGood Monitoring • 70% Under-Voluge Protection (UVP) • 125% Over-Voltage Protection (OVP) • Adjustable Current-Limit Protection • Using Sense Low-Side MOSFET1s RDS(ON) • TOFN32 4mmx4mm Thin package • Lead Free Available (RoHS Compliant) +1.5A LDO Section (vn) • Souring or Sinking Current up to 1.5A • Fast Transient Response for Output Voltage • Output Ceramic Capacitors Support at least I OpF MLCC • VII and VTTREF Track at Half the VDDOSNS by internal divider • 4.20mV Accuracy for VTT and VTTREF • Independent Over-Current Limit (OCL) • Thermal Shutdown Protection

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