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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Full Half-Bridge (H Bridge) Drivers

Allegro MicroSystems A5929KLPTR-T

Name: A5929KLPTR-T
Brand: Allegro MicroSystems
SKU: A5929KLPTR-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A5929KLPTR-T

Manufacturer:: Allegro MicroSystems

Category:: Full Half-Bridge (H Bridge) Drivers

Package:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: A5929KLPTR-T.pdf

Description:: IC HALF BRIDGE DRIVER 24TSSOP

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Product details

Overview

A5929KLPTR-T from Allegro MicroSystems is an automotive-grade full-bridge gate driver IC designed to control four external n-channel power MOSFETs in H-bridge motor drive topologies. It delivers high-current gate drive with integrated crossover protection, 5.5–50 V supply range, and real-time phase short-to-supply/ground detection via independent V_DS monitors. It is used in electric power steering (EPS), HVAC blower control, and seat actuator systems.

For engineers reviewing the A5929KLPTR-T datasheet, A5929KLPTR-T pinout, A5929KLPTR-T application, or A5929KLPTR-T equivalent, key selection criteria include bootstrap-enabled high-side drive down to 5.5 V battery, TTL-compatible logic inputs (3.3 V/5 V), open-drain FAULT reporting of overtemperature, VREG undervoltage, and V_DS faults, and thermal pad-equipped 24-pin eTSSOP package for automotive under-hood reliability.

Technical Context

The A5929KLPTR-T implements a charge-pump-regulated gate drive architecture that maintains >10 V gate voltage for high-side n-MOSFETs at battery voltages as low as 7 V, and sustains functional operation down to 5.5 V with reduced drive strength. Its dual-phase topology features independent AHI/ALO and BHI/BLO logic inputs enabling arbitrary PWM schemes including center-aligned, edge-aligned, fast/slow decay, and synchronous rectification.

Integrated diagnostics include per-phase V_DS monitoring with programmable threshold (via VDSTH pin), bootstrap capacitor undervoltage detection, VREG supply monitoring, and junction overtemperature warning (170–180 °C trip). Fault conditions are reported on a single open-drain FAULT output with latching behavior for bootstrap faults and non-latching for V_DS and overtemperature events.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	5.5 V to 50 V - supports wide automotive battery transients and cold-crank operation down to 5.5 V with functional gate drive.
VREG Output Voltage	12.5–13.75 V - regulated supply for low-side drivers and bootstrap capacitor charging; dynamically adjusts with VBB.
Gate Drive Propagation Delay	60–180 ns - tightly matched (≤10 ns phase-to-phase, ≤30 ns on/off) for precise PWM timing in high-resolution motor control.
V_DS Fault Threshold	Programmable 0.2–2.0 V via VDSTH pin - enables configurable short-circuit detection sensitivity for diverse motor winding resistances.
Thermal Resistance θ_JA	28 °C/W (4-layer PCB) - enables high-power operation with exposed thermal pad connected to GND plane.
Sleep Mode Current	<10 µA - ultra-low quiescent current during vehicle ignition-off states to meet automotive static current budgets.
Logic Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - TTL-compatible interface ensures robust operation with 3.3 V or 5 V microcontrollers without level-shifting.

Pinout & Package

Package: 24-pin eTSSOP (9.7 mm × 4.4 mm, 1.2 mm height) with exposed thermal pad (LP suffix); RoHS-compliant, 100% matte-tin lead frame plating.

Pin/Terminal	Circuit Role	Design Meaning
1, LSS	Common Low-side Source Return	Low-impedance ground reference for all low-side gate drivers and MOSFET source discharge path.
3, GLB & 7, GLA	Phase B/A Low-side Gate Drive	Active-high outputs sourcing/sinking ≥150 mA to drive n-MOSFET gates referenced to LSS.
4, GHB & 8, GHA	Phase B/A High-side Gate Drive	Floating outputs delivering >10 V gate voltage using bootstrap capacitors CA/CB; driven by charge pump.
5, SB & 9, SA	Motor Phase B/A Connection	High-current load terminals; also serve as negative bootstrap capacitor connections and V_DS sense points.
15, VBB	Main Power Supply Input	Primary input for all internal circuitry (logic, charge pump, regulators); accepts 5.5–50 V with reverse-voltage protection recommended.
17, GND	System Ground Reference	Analog/digital/power common return; must be connected to PCB ground plane and thermally tied to exposed pad.
18, ENAB	Global Enable Input	Active-high logic control: high = normal operation; low ≥7.5 ms = entry into sleep mode (<10 µA I_BB).
20, FAULT	Open-Drain Fault Indicator	Active-high output pulled externally to ≤5.5 V; signals VREG UV, overtemperature, V_DS, or bootstrap faults per Table 2.
21–24, AHI/ALO/BHI/BLO	Phase-Control Logic Inputs	TTL-level inputs controlling individual gate drivers; internal lockout prevents simultaneous high/low activation per phase.
PAD	Exposed Thermal Pad	Must be soldered to GND plane for thermal dissipation and EMI reduction; integral to θ_JA = 28 °C/W rating.

Key Features

Feature	Design Value
Charge-pump gate drive regulator	Maintains >10 V high-side gate drive down to 7 V VBB; extends functional operation to 5.5 V with reduced V_GS for emergency EPS hold.
Independent per-phase V_DS monitoring	Detects short-to-battery and short-to-ground faults on each MOSFET using dedicated VBRG/SA/SB/LSS sensing paths.
Programmable V_DS fault threshold	Voltage applied to VDSTH pin (0.2–2.0 V) sets exact turn-on threshold for short-circuit detection, enabling tuning for motor resistance and cable length.
Bootstrap capacitor undervoltage protection	Disables high-side drive if CA/CB voltage falls below VBOOTUV (62–75% of VREG), preventing shoot-through due to insufficient gate voltage.
Propagation delay matching	≤10 ns phase-to-phase and ≤30 ns on/off delay matching ensures synchronized PWM across both bridge legs for clean current commutation.

Applications

Electric Power Steering (EPS)	HVAC Blower Motor Control
Use Scenario: Bidirectional torque assist in 12 V automotive steering systems requiring fail-safe shutdown during overtemperature or phase short. IC Role / Device Role / Timing Role: Full-bridge gate driver controlling dual n-MOSFET half-bridges; manages PWM commutation, dead-time insertion (externally), and real-time V_DS fault detection per phase. Use Value: Enables ISO 26262 ASIL-B compliant motor control with latched bootstrap fault reporting and <10 µA sleep current for ignition-off battery preservation.	Use Scenario: Variable-speed cabin air circulation using brushed or brushless DC motors in passenger compartment HVAC modules. IC Role / Device Role / Timing Role: High-efficiency H-bridge driver supporting slow-decay PWM and synchronous rectification to minimize audible noise and conduction losses. Use Value: Delivers >10 V gate drive at cold-crank (6.5 V battery) ensuring reliable motor start-up; integrated VREG eliminates need for external LDO.
Automotive Seat Actuators	Engine Cooling Fan Control
Use Scenario: Precision positioning of power seats using dual-direction DC motors with stall detection and thermal derating. IC Role / Device Role / Timing Role: Dual-phase gate driver with independent AHI/ALO/BHI/BLO inputs enabling forward/reverse/brake/coast states; VDSTH pin configures stall threshold. Use Value: Programmable V_DS threshold allows differentiation between normal stall (high R_DS(on)) and hard short, reducing false fault trips during high-load movement.	Use Scenario: High-power radiator fan control in engine bay environments with ambient temperatures up to 150 °C. IC Role / Device Role / Timing Role: Robust full-bridge driver with 165 °C max junction temperature, exposed thermal pad, and overtemperature warning (170–180 °C) for thermal management. Use Value: θ_JA = 28 °C/W on 4-layer board enables continuous 5 A RMS phase current without forced air; FAULT output triggers fan speed reduction before shutdown.

Electric Power Steering (EPS)

HVAC Blower Motor Control

Use Scenario: Bidirectional torque assist in 12 V automotive steering systems requiring fail-safe shutdown during overtemperature or phase short.

IC Role / Device Role / Timing Role: Full-bridge gate driver controlling dual n-MOSFET half-bridges; manages PWM commutation, dead-time insertion (externally), and real-time V_DS fault detection per phase.

Use Value: Enables ISO 26262 ASIL-B compliant motor control with latched bootstrap fault reporting and <10 µA sleep current for ignition-off battery preservation.

Use Scenario: Variable-speed cabin air circulation using brushed or brushless DC motors in passenger compartment HVAC modules.

IC Role / Device Role / Timing Role: High-efficiency H-bridge driver supporting slow-decay PWM and synchronous rectification to minimize audible noise and conduction losses.

Use Value: Delivers >10 V gate drive at cold-crank (6.5 V battery) ensuring reliable motor start-up; integrated VREG eliminates need for external LDO.

Automotive Seat Actuators

Engine Cooling Fan Control

Use Scenario: Precision positioning of power seats using dual-direction DC motors with stall detection and thermal derating.

IC Role / Device Role / Timing Role: Dual-phase gate driver with independent AHI/ALO/BHI/BLO inputs enabling forward/reverse/brake/coast states; VDSTH pin configures stall threshold.

Use Value: Programmable V_DS threshold allows differentiation between normal stall (high R_DS(on)) and hard short, reducing false fault trips during high-load movement.

Use Scenario: High-power radiator fan control in engine bay environments with ambient temperatures up to 150 °C.

IC Role / Device Role / Timing Role: Robust full-bridge driver with 165 °C max junction temperature, exposed thermal pad, and overtemperature warning (170–180 °C) for thermal management.

Use Value: θ_JA = 28 °C/W on 4-layer board enables continuous 5 A RMS phase current without forced air; FAULT output triggers fan speed reduction before shutdown.

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-bridge gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DRV8876PWPR	Integrated current sense amplifier and SPI interface; no programmable V_DS threshold; 4.5–37 V VBB range.	Better suited for closed-loop current-controlled fans; lacks automotive-grade V_DS short detection granularity.	Select DRV8876PWPR when system-level current feedback and digital configuration are prioritized over discrete V_DS-based fault isolation.
MPQ6532GR-A	Monolithic dual-H-bridge (no external MOSFETs); 5–32 V input; integrated FETs rated 40 V/3.5 A; no VDSTH pin.	Targeted at lower-power auxiliary loads (e.g., small pumps); not suitable for high-current EPS or cooling fans.	Choose MPQ6532GR-A only for space-constrained, sub-3 A applications where external MOSFET flexibility and diagnostic depth are secondary to integration.

Compared with DRV8876PWPR and MPQ6532GR-A, the A5929KLPTR-T uniquely combines programmable per-phase V_DS fault detection, 5.5 V cold-crank operation, and exposed-pad thermal performance for high-reliability automotive motor control-making it the preferred choice for ASIL-B systems requiring deterministic fault classification and external FET optimization.

Availability

A5929KLPTR-T is available at Aetrix Electronics and suitable for electric power steering (EPS), HVAC blower control, and automotive seat actuator systems requiring stable component supply across extended temperature ranges and automotive lifecycle demands.

Supply support for A5929KLPTR-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 designer and manufacturer of high-performance magnetic sensors and power ICs, headquartered in Worcester, Massachusetts, with global engineering and manufacturing operations.

The A5929 product line is part of Allegro's automotive motor driver portfolio, engineered specifically for demanding under-hood applications such as EPS, cooling fans, and actuators-emphasizing robust fault diagnostics, wide supply range, and thermal resilience.

FAQ

What is the minimum battery voltage at which A5929KLPTR-T maintains full gate drive capability?

The A5929KLPTR-T maintains full (>10 V) gate drive capability down to 7 V VBB using its internal charge pump regulator. Below 7 V, functional operation continues down to 5.5 V VBB but with reduced gate drive voltage-enabling critical hold functions in automotive cold-crank scenarios while preserving system safety.

How does the VDSTH pin configure short-circuit detection on A5929KLPTR-T?

The VDSTH pin on the A5929KLPTR-T accepts an external analog voltage (0.2–2.0 V) to set the V_DS fault threshold for each phase. When VDSTH is within this range, the actual threshold tracks the applied voltage with ±100 mV offset accuracy; outside this range, it defaults to internal 1.2 V or disables reporting-enabling precise tuning for motor winding resistance and cable drop.

Does A5929KLPTR-T require external bootstrap diodes?

No, the A5929KLPTR-T integrates internal bootstrap diodes with forward voltage of 0.4–1.0 V (at 10 mA) and on-resistance of 6–28 Ω. External diodes are unnecessary; instead, 470 nF ceramic capacitors are connected between CP1–CP2 and CA–SA/CB–SB to complete the charge pump and bootstrap networks.

What happens to gate drive outputs during a VREG undervoltage fault on A5929KLPTR-T?

During a VREG undervoltage fault, the A5929KLPTR-T asserts the FAULT pin high and disables all gate drive outputs (GHx/GLx go low), halting MOSFET switching until VREG rises above the rising lockout threshold (7.5–8.5 V). This prevents unreliable gate drive and potential shoot-through during unstable regulation.

Can A5929KLPTR-T drive both brushed and brushless DC motors?

Yes, the A5929KLPTR-T is topology-agnostic: it drives brushed DC motors directly in H-bridge mode, and brushless DC (BLDC) motors when paired with an external controller that provides commutation sequencing and dead-time management via AHI/ALO/BHI/BLO inputs-leveraging its precise propagation matching and fault reporting.

A5929KLPTR-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Series:: -

Package/Case:: 24-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Half Bridge (2)

Applications:: DC Motors, General Purpose

Interface:: Logic

Load Type:: Inductive

Technology:: Power MOSFET

Rds On (Typ):: -

Current - Output / Channel:: -

Current - Peak Output:: -

Voltage - Supply:: 5.5V ~ 50V

Voltage - Load:: 5.5V ~ 50V

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

Grade:: -

Qualification:: -

Features:: Status Flag

Fault Protection:: Over Temperature, UVLO

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP-EP

A5929KLPTR-T FAQ

1.How can I place an order for A5929KLPTR-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A5929KLPTR-T 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 A5929KLPTR-T reliable?

The price and inventory of A5929KLPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A5929KLPTR-T is usually 5 days.

3.What payment methods are accepted for A5929KLPTR-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A5929KLPTR-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A5929KLPTR-T?

A5929KLPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A5929KLPTR-T 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 A5929KLPTR-T?

For technical support, including A5929KLPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A5929KLPTR-T requirements.

6.How does Aetrix verify that A5929KLPTR-T is sourced from the original manufacturer or authorized distributors?

All A5929KLPTR-T 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 A5929KLPTR-T meets industry standards.

7.What is the process for return or replacement of A5929KLPTR-T?

All A5929KLPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A5929KLPTR-T, 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 A5929KLPTR-T part is unused and in its original packaging.

Return procedure for A5929KLPTR-T:

1.Submit a request within 90 days.

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

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