Allegro MicroSystems A4919GLPTR-3-T

Overview

A4919GLPTR-3-T from Allegro MicroSystems is a three-phase N-channel MOSFET gate driver IC with integrated 3.3 V low-dropout (LDO) regulator, designed for brushless DC (BLDC) motor control in battery-powered systems. It operates from 5.5 V to 50 V supply, delivers >10 V gate drive down to 7 V input via charge pump, and provides independent phase short-to-supply/ground detection with open-drain FAULT output. Used in power tools and CPAP machines.

For engineers reviewing the A4919GLPTR-3-T datasheet, A4919GLPTR-3-T pinout, A4919GLPTR-3-T application, or A4919GLPTR-3-T equivalent, this page details its 28-pin TSSOP-LP package, six logic-controlled gate drives (GHA/GLA–GHC/GLC), bootstrap capacitor management, VDSTH-programmable fault threshold, and LDO-regulated 3.3 V output for external circuitry.

Technical Context

The A4919GLPTR-3-T implements a charge pump regulator to sustain ≥10 V high-side gate drive at VBB ≥ 7 V, and maintains functional operation down to VBB = 5.5 V with reduced gate voltage. Its six independent TTL-compatible inputs (AHI/ALO–CHI/CLO) enable arbitrary commutation schemes managed by an external microcontroller.

Phase-specific drain-source voltage monitoring uses the VDSTH pin to set fault thresholds between 0.2 V and 2.0 V, with internal offsets ±100 mV for short-to-ground and short-to-supply detection. The integrated 3.3 V LDO (V3) supplies external logic but does not power internal circuitry and requires ≥1 µF/≤250 mΩ output capacitance per datasheet.

Key Specifications

Pinout & Package

28-pin TSSOP with exposed thermal pad (package LP), lead-free with 100% matte-tin plating. Thermal pad must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase gate driver applications.

Compared with MP6532GQ-Z and DRV8305PAPR, the A4919GLPTR-3-T uniquely combines pin-strapped 3.3 V LDO output, analog VDSTH programmability, and minimal external component count in a compact TSSOP-LP package-ideal for cost-sensitive, space-constrained BLDC systems requiring deterministic analog fault response.

Availability

A4919GLPTR-3-T is available at Aetrix Electronics and suitable for battery-operated power tools, CPAP machines, and industrial grinders requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for A4919GLPTR-3-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Allegro MicroSystems is a U.S.-based semiconductor company specializing in magnetic sensing, power ICs, and motor control solutions, with design centers in North America and Asia.

The A4919 product line delivers high-efficiency, robust three-phase gate drivers for BLDC motors in portable and medical equipment, emphasizing integrated protection, wide input range, and minimal external component count.

FAQ

What is the function of the V3 pin on the A4919GLPTR-3-T?

The V3 pin on the A4919GLPTR-3-T is the output of the integrated 3.3 V low-dropout regulator, designed exclusively to power external circuitry such as microcontrollers, Hall-effect sensors, or communication interfaces. It does not supply internal logic or gate drivers. Per datasheet specifications, it requires a minimum 1 µF ceramic capacitor with ESR ≤250 mΩ connected directly to GND for stability, and delivers up to 70 mA with output voltage tightly regulated between 3.15 V and 3.53 V.

Does the A4919GLPTR-3-T support sleep mode?

No, the A4919GLPTR-3-T does not support sleep mode. Sleep mode is only available on the A4919x (no LDO) variants like A4919GLPTR-T. The A4919GLPTR-3-T integrates a 3.3 V LDO regulator and disables sleep functionality entirely; all logic inputs remain active regardless of state, and quiescent current remains at typical 10 mA in operational mode. This ensures continuous readiness for motor control commands without wake-up latency.

How is high-side gate drive achieved on the A4919GLPTR-3-T given its use of N-channel MOSFETs?

The A4919GLPTR-3-T achieves high-side N-channel MOSFET drive using a charge pump-regulated VREG supply (nominally 13 V) and external bootstrap capacitors. Each phase has dedicated bootstrap terminals (CA/SA, CB/SB, CC/SC): when the low-side MOSFET is on, SA/SB/SC are pulled near GND, charging the bootstrap capacitor; when the low-side turns off and high-side activates, the capacitor lifts the GHx output above the motor phase voltage, enabling full gate enhancement. The charge pump (CP1/CP2) sustains VREG ≥10 V down to VBB = 7 V.

What protection features does the A4919GLPTR-3-T provide against MOSFET failures?

The A4919GLPTR-3-T provides per-phase short-to-supply and short-to-ground detection via independent drain-source voltage monitors on each external MOSFET, configurable through the VDSTH pin (0.2–2.0 V threshold). It also includes cross-conduction prevention logic, VBB undervoltage lockout (5.5 V min), overtemperature warning (170–180 °C junction), and open-drain FAULT output that asserts high for any detected fault condition. These protections operate independently of external control, ensuring hardware-level safety.

Can the A4919GLPTR-3-T drive both high-side and low-side N-channel MOSFETs without additional level-shifting components?

Yes, the A4919GLPTR-3-T is specifically designed to drive both high-side and low-side N-channel MOSFETs without external level shifters. Low-side drives (GLA–GLC) are ground-referenced and directly compatible. High-side drives (GHA–GHC) use internal charge pump regulation (VREG) and external bootstrap capacitors (CA–CC) to generate floating gate drive voltages ≥10 V relative to each motor phase (SA–SC), enabling full enhancement of N-channel devices in the upper half of the bridge.