APM81911中文资料ALLEGRO数据手册PDF规格书

FEATURES AND BENEFITS

• AEC-Q100 Grade 1 qualified

• ClearPower module DC/DC converter with internal

passive components

• VIN Range: 3.5 to 36 V operating, 40 V transient

• VOUT: 0.8 to 24 V, ±1.5 accuracy, ‒40°C to 150°C

• Up to 3 A of continuous output current

• Ultra-Low EMI design and selectable spread spectrum

to easily pass CISPR25 Class 5

• Low-Power (LP) mode: 6 μA IQ from VIN at no load,

automatic transition from LP to PWM mode

• Fixed Frequency PWM (fOSC): 1 MHz to 2.4 MHz,

programmable

• 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

APPLICATIONS:

• Infotainment

• Navigation systems

• ADAS

• Industrial systems

DESCRIPTION

The APM81911 is a highly integrated, 3 A, low EMI, DCDC

buck regulator module that satisfies demanding power

delivery requirements. The APM81911 includes a high-performance

DC-DC regulator IC, two capacitors, and an inductor

in a compact 4 mm × 6 mm QFN package. The module

includes all the control and protection circuitry necessary

to produce a robust and scalable DC-DC regulator solution

with ±1.5 output voltage accuracy over the full operating

temperature range.

The fixed frequency, peak current mode control is programmable

from 1 MHz to 2.4 MHz, ensuring rapid response to

load and line transients. A 2.15 MHz PWM switching frequency

is programmed by connecting the FSET pin to VCC.

The VIN and BOOT pin bypass capacitors are integrated

into the module to greatly reduce noise-generating hot loops

which significantly improves radiated EMI. Spread spectrum

operation (dithering) is available to further reduce EMI. The

APM81911-1 part variant is available for applications where

dithering is not desired.

The Low Power (LP) mode maintains the output voltage at

no-load or very light load conditions while drawing only

microamps from VIN. At no-load, the APM81911 draws

only 6 μA. The transition between PWM and LP modes

is automatic in response to the load demand. PWM-only

operation is available to prevent pulse skipping at light load

conditions.