Texas Instruments DRV2604LYZFT

Overview

DRV2604LYZFT from Texas Instruments is a low-voltage haptic driver IC for linear resonance actuators (LRA) and eccentric rotating mass (ERM) motors, featuring integrated RAM for >100 waveforms, I²C-controlled closed-loop control with automatic resonance tracking (LRA), and real-time playback mode. It operates from 2 V to 5.2 V and delivers differential switching output drive for tactile feedback in mobile handsets.

For engineers reviewing the DRV2604LYZFT datasheet, DRV2604LYZFT pinout, DRV2604LYZFT application, or DRV2604LYZFT equivalent, key selection criteria include closed-loop LRA resonance tracking accuracy, ERM braking consistency, internal RAM capacity for waveform storage, REG pin 1.8-V regulator output capability, and hardware trigger (IN/TRIG) support for latency-critical haptic events.

Technical Context

The DRV2604LYZFT implements a patented Smart-Loop architecture that combines back-EMF detection, automatic level calibration, and real-time resonance tracking for LRAs - enabling auto-synchronization within half a cycle and reporting of resonant period via register 0x22. It supports dual-mode operation: closed-loop for precision actuator control and open-loop fallback when valid back-EMF is absent.

Its control engine integrates a waveform sequencer, trigger logic, and real-time playback (RTP) mode over I²C, allowing host processors to stream waveforms directly without RAM preloading. The trinary-modulated output stage provides higher efficiency than linear drivers, while PWM input (10–250 kHz) and 1.8-V-tolerant digital interface ensure compatibility with modern application processors.

Key Specifications

Pinout & Package

DRV2604LYZFT uses a 9-pin DSBGA (YZF) package with 0.5-mm pitch and 1.50 mm × 1.50 mm body size. Thermal resistance R_θJA is 145.2°C/W, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar haptic driver applications.

Compared with DRV2604LYZFT, DRV2605L adds boost conversion at the expense of board area and complexity, while DRV2667 reduces feature set and diagnostic capability to lower BOM cost - making DRV2604LYZFT the optimal balance of intelligence, integration, and compact DSBGA packaging for mid-tier mobile haptics.

Availability

DRV2604LYZFT is available at Aetrix Electronics and suitable for smartphone tactile feedback, tablet button simulation, wearable device alerts, and automotive infotainment haptics requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DRV2604LYZFT 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and interface solutions.

The DRV2604LYZFT belongs to TI's haptic driver product line, designed specifically to deliver high-fidelity, low-latency tactile feedback in battery-powered portable devices using closed-loop control and intelligent actuator adaptation.

FAQ

What is the primary function of the REG pin on the DRV2604LYZFT?

The REG pin on the DRV2604LYZFT is a 1.8-V regulator output used to power external logic or level-shifting circuitry. It delivers a stable 1.8-V ±3% supply and requires a 1-µF ceramic capacitor to GND for stability. This eliminates the need for an external LDO in systems where 1.8-V logic is present, reducing BOM count and layout complexity. The DRV2604LYZFT relies on this regulated output for internal interface compatibility and can operate without external 1.8-V sources.

How does the DRV2604LYZFT handle LRA resonance tracking when the actuator is not generating valid back-EMF?

When the DRV2604LYZFT detects invalid or absent back-EMF from an LRA, it automatically transitions to open-loop operation using a configurable default frequency calculated per Equation 1 in the datasheet. This ensures continuous actuation without interruption. Once valid back-EMF resumes, the Smart-Loop architecture re-synchronizes within half a cycle. The DRV2604LYZFT does not require firmware intervention for this transition - it is fully autonomous and managed by internal analog comparators and state machines.

Can the DRV2604LYZFT drive both LRA and ERM actuators in the same design?

Yes, the DRV2604LYZFT supports both LRA and ERM actuators in the same hardware design. The actuator type is selected via the ERM_LRA bit (bit 7) in register 0x1A. Closed-loop Smart-Loop features - including automatic overdrive, braking, and level calibration - apply to both types, though resonance tracking and reporting are LRA-specific. The DRV2604LYZFT's differential output stage and wide 2–5.2 V supply range make it adaptable to diverse haptic loads without changing external components.

What is the minimum startup latency achievable with the DRV2604LYZFT in hardware-triggered mode?

The DRV2604LYZFT achieves a minimum startup latency of 0.7 ms from assertion of the GO bit in register 0x02, or 1.5 ms from EN pin rising edge in PWM/analog modes. In hardware-triggered mode using the IN/TRIG pin, latency depends on configuration but remains sub-millisecond due to dedicated trigger path bypassing I²C arbitration. This performance is validated across temperature and supply voltage (2–5.2 V), making the DRV2604LYZFT suitable for UI-critical applications like tap feedback where human perception thresholds are ~10–20 ms.

Does the DRV2604LYZFT require external components for basic operation?

Yes, the DRV2604LYZFT requires two mandatory external components: a 1-µF ceramic capacitor on VDD and a 1-µF ceramic capacitor on the REG pin, both placed as close as possible to their respective pins. No external resistors or inductors are needed for standard operation. The device integrates all control logic, RAM, regulators, and gate drivers - enabling a minimal bill-of-materials. These capacitors ensure stable power delivery and prevent oscillation during high-current haptic transients, directly impacting output fidelity and reliability of the DRV2604LYZFT.