Allegro MicroSystems APM81911 Synchronous DC-DC Buck Regulator Modules
Allegro Microsystems APM81911 Synchronous DC-DC Buck Regulator Modules are highly integrated, 3A, low EMI devices that satisfy demanding power delivery requirements. APM81911 includes a high-performance DC-DC regulator IC, two capacitors, and an inductor in a compact 4mm × 6mm QFN package. The modules include all the control and protection circuitry necessary to produce a robust/scalable DC-DC regulator solution with ±1.5% output voltage accuracy over the full operating temperature range.
The 1MHz to 2.4MHz programmable, fixed frequency, peak current mode control ensures rapid load and line transients response. A 2.15MHz PWM switching frequency is programmed by connecting the FSET pin to VCC. The integrated VIN and BOOT pin bypass capacitors greatly reduce noise-generating hot loops, significantly improving radiated EMI. Spread spectrum operation (dithering) is available to reduce EMI further. The APM81911-1 part variant is available for applications where dithering is not desired.
Protection features include pulse-by-pulse current limit, hiccup mode short-circuit protection, BOOT open/short voltage protection, VIN undervoltage lockout, VOUT overvoltage protection, and thermal shutdown. The APM81911 is offered in a thermally enhanced, 4mm × 6mm × 2.1mm, 32-pin wettable flank QFN package (suffix “NB”) with exposed power pads.
Features
- AEC-Q100 Grade 1 qualified
- ClearPower module DC/DC converter with internal passive components
- 3.5V to 36V operating input range, 40V transient
- 0.8V to 24V output range with ±1.5% accuracy at -40°C to +150°C
- Up to 3A of continuous output current
- Ultra-Low EMI design and selectable spread spectrum to easily pass CISPR25 Class 5
- Low-Power (LP) mode - 6µA IQ from VIN at no load, automatic transition from LP to PWM mode
- 1MHz to 2.4MHz programmable fixed frequency PWM
- Synchronization (1 MHz to 2.4 MHz) - PLL-based, fSYNC can be above or below fOSC
- CLKOUT - Phase-shifted clock output for reduced EMI in multi-converter systems
- Accurate enable input threshold
- Overvoltage, pulse-by-pulse current limit, hiccup mode short-circuit, and thermal protections
- Robust FMEA, pin open/short and component faults
- 32-pin QFN (4mm x 6mm x 2.1mm) with wettable flank (suffix NB)
Applications
- Infotainment
- Navigation systems
- ADAS
- Industrial systems
Typical Application
Block Diagram
Evaluation Board
Allegro MicroSystems APEK81911 Vertinimo Plokštė
Įvertina APM81911 sinchroninių „buck” reguliatorių modulių funkcionalumą ir efektyvumą.
Associated Products
Allegro MicroSystems APM81815 Synchronous Buck Regulator
Ideal for 48V systems to provide superior EMI performance in dual-voltage hybrid electric vehicles.