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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Allegro MicroSystems A1445EEWLT-P

Name: A1445EEWLT-P
Brand: Allegro MicroSystems
SKU: A1445EEWLT-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A1445EEWLT-P

Manufacturer:: Allegro MicroSystems

Category:: Motor Drivers, Controllers

Package:: 6-XFDFN Exposed Pad

Datasheet:: A1445EEWLT-P.pdf

Description:: IC MOTOR DRIVER 1.8V-4.2V 6DFN

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Product details

Overview

A1445EEWLT-P from Allegro MicroSystems is a low-voltage full-bridge brushless DC motor driver with integrated Hall element, soft switching, reverse battery protection, and externally controlled speed regulation via PDC pin. It operates from 1.8 V to 4.2 V, delivers ±250 mA continuous output current, and features unidirectional rotation, antistall recovery, and micropower sleep mode - designed for vibration motor control in cellular phones and handheld game controllers.

For engineers reviewing the A1445EEWLT-P datasheet, A1445EEWLT-P pinout, A1445EEWLT-P application, or A1445EEWLT-P equivalent, key selection criteria include its 6-pin MLP/DFN (1.5 mm × 2 mm) package, Hall-based commutation, selectable internal PWM duty cycle (71–89%), thermal shutdown at 165 °C, and compatibility with fast start-stop cycles in space-constrained portable electronics.

Technical Context

The A1445EEWLT-P integrates a Hall sensor, full-bridge driver, chopper-stabilized signal conditioning, and PWM speed control logic on a single CMOS die. Its soft switching algorithm controls slew rate on both outputs to reduce EMI and audible noise, while the antistall feature actively detects rotor stall and initiates restart sequences without external intervention.

Speed regulation is implemented via analog voltage level on the PDC pin, selecting among three discrete internal PWM duty cycles (71%, 80%, or 89%). The SLEEP pin enables braking (reversing bridge polarity briefly) followed by micropower sleep mode (<10 µA), eliminating need for external FETs in battery-powered systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	1.8 V to 4.2 V - enables operation directly from single Li-ion or NiMH cells without LDO
Continuous Output Current	±250 mA - supports compact vibration motors and low-power fans up to ~5 V rating
Internal PWM Frequency	40 kHz - high enough to avoid audible noise, low enough for efficient MOSFET switching
PWM Duty Cycle Options	71%, 80%, 89% - selected by PDC pin voltage, enabling precise speed tuning across motor loads
Thermal Shutdown Threshold	165 °C with 20 °C hysteresis - protects against sustained overloads and PCB-level thermal runaway
Hall Switchpoints	B_OP = 35–75 G, B_RP = –75 to –35 G - ensures reliable commutation with standard ring magnets
Sleep Mode Current	<10 µA - extends battery life in always-on portable devices during idle periods

Pinout & Package

Package: 6-contact MLP/DFN (EW), 1.5 mm × 2 mm footprint, 0.38 mm nominal height, with exposed thermal pad for enhanced heat dissipation in high-density layouts.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Positive supply input	Accepts 1.8–4.2 V; includes reverse battery protection - no external diode required
SLEEP	Enable/brake/sleep control input	Active-low; initiates braking then enters <10 µA sleep mode - eliminates external power-switching FET
PDC	Programmable duty cycle select	Analog input (0–VDD); sets internal PWM duty cycle to 71%, 80%, or 89% for speed calibration
GND	Power and signal reference	Common return path for supply, Hall sensing, and output bridge; connects to exposed thermal pad
VOUT1	Bridge output terminal 1	Drives one side of BLDC motor coil; complementary to VOUT2; rated for ±500 mA peak
VOUT2	Bridge output terminal 2	Drives opposite side of motor coil; enables unidirectional rotation via Hall-commutated full-bridge

Key Features

Feature	Design Value
Chopper-stabilized Hall sensing	Reduces offset drift over –40 °C to +85 °C, ensuring consistent commutation across temperature
Soft switching slew-rate control	Minimizes EMI emissions and audible coil whine in noise-sensitive handheld applications
Integrated reverse battery protection	Blocks –5.0 V reverse supply without external components - simplifies PCB layout and BOM
Antistall algorithm	Automatically attempts motor restart upon stall detection - improves reliability in jam-prone mechanisms
Unidirectional operation mode	Guarantees fixed rotation direction - eliminates need for direction-control logic in vibration actuators

Applications

Vibration Motor Control	Low-Power Fan Drive
Use Scenario: Haptic feedback generation in smartphones and wearable devices requiring rapid motor start-stop cycles. IC Role / Device Role / Timing Role: Full-bridge driver with Hall commutation and soft switching - provides precise timing-synchronized rotor position feedback and torque control. Use Value: Enables <100 ms restart delay and <160 µs Hall settling time for responsive tactile feedback without audible artifacts.	Use Scenario: Thermal management in portable medical monitors and handheld test equipment using 5 V-rated micro-fans. IC Role / Device Role / Timing Role: Low-voltage motor controller with externally adjustable PWM duty cycle - regulates fan speed based on temperature sensor output. Use Value: Delivers stable 71–89% duty cycle options via PDC pin, supporting fine-grained airflow control down to 1.8 V supply.
Portable Gaming Controller Actuation	Pager Motor Driver
Use Scenario: Force-feedback triggers and rumble motors in Bluetooth-enabled game controllers with strict power budget constraints. IC Role / Device Role / Timing Role: Micropower motor driver with sleep mode - activates only during user interaction, reducing average system current. Use Value: Achieves <10 µA sleep current and fast wake-up (<100 ms), extending battery life without sacrificing responsiveness.	Use Scenario: Alert vibration in legacy pagers where board space and component count are critical design constraints. IC Role / Device Role / Timing Role: Single-chip Hall-commutated driver - replaces discrete Hall sensor + H-bridge + control logic. Use Value: Integrates reverse battery, short-circuit, and thermal protection - eliminates 3–4 external protection components per motor channel.

Vibration Motor Control

Low-Power Fan Drive

Use Scenario: Haptic feedback generation in smartphones and wearable devices requiring rapid motor start-stop cycles.

IC Role / Device Role / Timing Role: Full-bridge driver with Hall commutation and soft switching - provides precise timing-synchronized rotor position feedback and torque control.

Use Value: Enables <100 ms restart delay and <160 µs Hall settling time for responsive tactile feedback without audible artifacts.

Use Scenario: Thermal management in portable medical monitors and handheld test equipment using 5 V-rated micro-fans.

IC Role / Device Role / Timing Role: Low-voltage motor controller with externally adjustable PWM duty cycle - regulates fan speed based on temperature sensor output.

Use Value: Delivers stable 71–89% duty cycle options via PDC pin, supporting fine-grained airflow control down to 1.8 V supply.

Portable Gaming Controller Actuation

Pager Motor Driver

Use Scenario: Force-feedback triggers and rumble motors in Bluetooth-enabled game controllers with strict power budget constraints.

IC Role / Device Role / Timing Role: Micropower motor driver with sleep mode - activates only during user interaction, reducing average system current.

Use Value: Achieves <10 µA sleep current and fast wake-up (<100 ms), extending battery life without sacrificing responsiveness.

Use Scenario: Alert vibration in legacy pagers where board space and component count are critical design constraints.

IC Role / Device Role / Timing Role: Single-chip Hall-commutated driver - replaces discrete Hall sensor + H-bridge + control logic.

Use Value: Integrates reverse battery, short-circuit, and thermal protection - eliminates 3–4 external protection components per motor channel.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-voltage BLDC motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
A1442	No integrated Hall element; requires external Hall sensor; lower supply range (1.6–3.6 V)	Suitable for designs needing flexible magnetic sensing placement or higher temperature operation (–40 °C to +125 °C)	Select when Hall sensor location must be decoupled from driver IC or extended temperature range is required
A1448	Includes bidirectional rotation capability; higher continuous current (±350 mA); same 1.8–4.2 V range	Required for applications needing reversible motor motion (e.g., optical zoom actuators, dual-direction haptics)	Choose when motor direction reversal is essential and higher drive strength justifies larger footprint

Compared with A1445EEWLT-P, the A1442 lacks on-die Hall sensing and operates at lower voltage, making it less suitable for compact single-cell vibration systems; the A1448 adds bidirectional control and higher current but increases complexity and cost where unidirectional operation suffices.

Availability

A1445EEWLT-P is available at Aetrix Electronics and suitable for vibration motor control, portable gaming actuation, pager alert systems, and low-power fan drive applications requiring stable component supply despite its Last Time Buy status.

Supply support for A1445EEWLT-P 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 high-performance magnetic sensing and power ICs for motion control, automotive, and industrial applications.

The A1445 belongs to Allegro's low-voltage BLDC motor driver product line, engineered specifically for space-constrained portable electronics requiring integrated Hall commutation, ultra-low power sleep, and robust fault protection.

FAQ

What is the operating voltage range for the A1445EEWLT-P?

The A1445EEWLT-P operates from 1.8 V to 4.2 V, supporting direct connection to single-cell Li-ion or NiMH batteries. Extended functionality down to 1.8 V includes full Hall sensing and PWM control, though magnetic switchpoints and R_DS(on) exhibit slight variation at the lower end. This range makes the A1445EEWLT-P ideal for battery-powered portable devices where supply headroom is minimal.

How does the PDC pin control motor speed in the A1445EEWLT-P?

The PDC pin on the A1445EEWLT-P selects among three discrete internal PWM duty cycles: 71% (PDC < 0.5 V), 80% (PDC floating), or 89% (PDC > V_DD–0.5 V). This analog-level programming allows precise speed calibration without external microcontroller intervention. The A1445EEWLT-P uses this setting to regulate maximum motor RPM during Hall-commutated operation above the SROT threshold.

Does the A1445EEWLT-P support bidirectional motor rotation?

No, the A1445EEWLT-P operates exclusively in unidirectional mode - it drives the motor in one fixed direction only. This design choice simplifies control logic and reduces silicon area, making it optimal for vibration motors and alert actuators. For bidirectional applications, Allegro recommends the A1448, which shares the same package and voltage range but adds direction control capability.

What protection features are integrated into the A1445EEWLT-P?

The A1445EEWLT-P integrates reverse battery protection (–5.0 V on VDD), output short-circuit protection, thermal shutdown at 165 °C with 20 °C hysteresis, and antistall recovery. These functions eliminate the need for external protection components like reverse-polarity diodes or current-sense resistors, reducing BOM count and PCB area - a key advantage in miniaturized portable designs using the A1445EEWLT-P.

Is the A1445EEWLT-P still recommended for new designs?

No - the A1445EEWLT-P is classified as "Not for New Design" with Last Time Buy status effective May 4, 2009. Allegro recommends transitioning to the A1442 or A1448 for new applications. However, Aetrix Electronics continues to support existing designs with traceable inventory, lifecycle coordination, and volume procurement assistance for the A1445EEWLT-P where legacy compatibility is required.

A1445EEWLT-P Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 6-XFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (2)

Interface:: On/Off

Technology:: CMOS

Step Resolution:: -

Applications:: Haptic Feedback

Current - Output:: 250mA

Voltage - Supply:: 1.8V ~ 4.2V

Voltage - Load:: 1.8V ~ 4.2V

Operating Temperature:: -40°C ~ 165°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-DFN/MLP (1.5x2)

A1445EEWLT-P FAQ

1.How can I place an order for A1445EEWLT-P through Aetrix?

Please submit a Request for Quotation (RFQ) for A1445EEWLT-P on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for A1445EEWLT-P reliable?

The price and inventory of A1445EEWLT-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1445EEWLT-P is usually 5 days.

3.What payment methods are accepted for A1445EEWLT-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1445EEWLT-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A1445EEWLT-P?

A1445EEWLT-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A1445EEWLT-P order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for A1445EEWLT-P?

For technical support, including A1445EEWLT-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1445EEWLT-P requirements.

6.How does Aetrix verify that A1445EEWLT-P is sourced from the original manufacturer or authorized distributors?

All A1445EEWLT-P products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A1445EEWLT-P meets industry standards.

7.What is the process for return or replacement of A1445EEWLT-P?

All A1445EEWLT-P units undergo pre-shipment inspection (PSI). If there is an issue with A1445EEWLT-P, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The A1445EEWLT-P part is unused and in its original packaging.

Return procedure for A1445EEWLT-P:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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