Allegro MicroSystems A8660 Synchronous Buck Controller
Allegro MicroSystems A8660 Synchronous Buck Controller is designed to satisfy the power supply requirements of industrial, automotive, and consumer applications. The A8660 controller includes all the control and protection circuitry to produce a robust PWM controller delivering high currents. This controller features PWM frequency dithering that reduces EMI/EMC and soft recovery that prevents output voltage overshoot when the converter comes out of a low VIN dropout condition. An external clock can be applied to the SYNCIN pin to shift the PWM harmonics for high-current, low-frequency designs, avoiding AM band interference with a tuner or other sensitive electronics. External compensation is featured so this controller can be tuned to satisfy various system goals over a wide range of PWM frequencies and external components. Allegro MicroSystems A8660 Synchronous Buck Controller consists of several protections, including pulse-by-pulse current limit, hiccup mode short-circuit protection, BOOT open/short voltage protection, and VIN undervoltage protection.
Features
- Adjustable output voltage
- PWM frequency dithering reduces EMI/EMC signature and minimizes input filtering
- Soft recovery from dropout avoids overshoot of VOUT
- External compensation provides flexibility to tune the system for maximum stability or optimum transient response
- Adjustable soft-start time controls inrush current to accommodate a wide range of output capacitances
- Pre-bias startup allows quick, monotonic restart and avoids reset
- High-voltage ENBAT input for ignition/key control
- Logic enable (EN) input for microcontroller or DSP control
- NPOR open-drain output with adjustable rising delay
- Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protections
- Robust FMEA: pin open/short and component faults
Applications
- Infotainment
- Navigation systems
- Instrument clusters
- Audio systems
- ADAS
- Battery-powered systems
- Industrial systems
- Network and telecom
- Home audio
- HVAC systems
Specifications
- Automotive AEC-Q100 qualified
- 3V to 45V operating voltage range
- 200kHz to 2.2MHz programmable base frequency
- 20-pin 4mm x 4mm QFN (ES) with wettable flank
- -40°C to +150°C temperature range
Typical Application Schematic
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发布日期: 2023-05-16
| 更新日期: 2023-05-19