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APW8828
Active
High-Performance Notebook PWM Controller
Features
± 1% Accuracy Over-Temperature
General Description
The APW8828 is a single-phase, constant-on-time, synchronous PWM controller, which drives N-channel MOSFETs. The APW8828 steps down high voltage to generate low-voltage for chipset or RAM supplies in notebook computers. The APW8828 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the APW8828 provides very high efficiency over light to heavy loads with loadingmodulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low-noise requirements. The APW8828 is equipped with accurate positive currentlimit, output under-voltage, and output over-voltage protections, perfect for NB applications. The Power-OnReset function monitors the voltage on VCC to prevent wrong operation during power-on. The APW8828 has a 1ms digital soft-start and integrates ramp-down control for soft-stop. An internal integrated soft-start ramps up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors with controlled reverse inductor current. The APW8828 is available in 10pin TDFN 3x3 package.
Features
- Adjustable Output Voltage from +0.7V to +5.5V
± 1% Accuracy Over-Temperature
- Operates from an Input Battery Voltage Range of +1.8V to +28V
- Power-On-Reset Monitoring on VCC Pin
- Excellent Line and Load Transient Responses
- PFM Mode for Increased Light Load Efficiency
- Selectable PWM Frequency from 4 Preset Values
- Integrated MOSFET Drivers
- Integrated Bootstrap Forward P-CH MOSFET
- Adjustable Integrated Soft-Start and Soft-Stop
- Selectable Forced PWM or Automatic PFM/PWM Mode
- Power Good Monitoring
- 70% Under-Voltage Protection
- 125% Over-Voltage Protection
- Adjustable Current-Limit Protection
- Over-Temperature Protection
- TDFN-10 3x3 Package
- Lead Free and Green Devices Available (RoHS Compliant)
General Description
The APW8828 is a single-phase, constant-on-time, synchronous PWM controller, which drives N-channel MOSFETs. The APW8828 steps down high voltage to generate low-voltage for chipset or RAM supplies in notebook computers. The APW8828 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the APW8828 provides very high efficiency over light to heavy loads with loadingmodulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low-noise requirements. The APW8828 is equipped with accurate positive currentlimit, output under-voltage, and output over-voltage protections, perfect for NB applications. The Power-OnReset function monitors the voltage on VCC to prevent wrong operation during power-on. The APW8828 has a 1ms digital soft-start and integrates ramp-down control for soft-stop. An internal integrated soft-start ramps up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors with controlled reverse inductor current. The APW8828 is available in 10pin TDFN 3x3 package.
