Texas Instruments REF3220AIDBVTG4

Overview

REF3220AIDBVTG4 from Texas Instruments is a precision 2.048V bandgap voltage reference IC with 0.01% initial accuracy, 4ppm/°C drift (0°C to +125°C), ±10mA output current, and 110μA quiescent current in SOT23-6 package-designed for high-accuracy data acquisition systems requiring stable excitation of 12-bit to 16-bit ADCs.

For engineers reviewing the REF3220AIDBVTG4 datasheet, REF3220AIDBVTG4 pinout, REF3220AIDBVTG4 application, or REF3220AIDBVTG4 equivalent, this page delivers verified specifications, force-sense architecture details, thermal hysteresis behavior, low-dropout operation down to 5mV, and real-world implementation guidance for portable medical instruments and battery-powered test equipment.

Technical Context

The REF3220AIDBVTG4 implements a CMOS-based bandgap core with separate force (OUT_F) and sense (OUT_S) outputs, enabling remote load regulation by compensating for trace resistance up to 200mV differential between GND_S and GND_F. Its architecture supports stable operation with any capacitive load and no external compensation.

It features dual ground pins (GND_F for reference core, GND_S for sense path), digital ENABLE control for shutdown (1μA typical), and operates from supply voltages as low as V_OUT + 5mV under no-load conditions-making it suitable for ultra-low-voltage systems where headroom is constrained.

Key Specifications

Pinout & Package

SOT23-6 (DBV) package: 2.9mm × 2.8mm footprint with gull-wing leads; RoHS-compliant, NIPDAU lead finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF3220AIDBVTG4, REF3420RTET offers superior drift performance but sacrifices the integrated force-sense correction essential for high-accuracy point-of-load regulation, while ADR3420ARMZ reduces BOM count at the expense of guaranteed 0.01% accuracy and programmable power control.

Availability

REF3220AIDBVTG4 is available at Aetrix Electronics and suitable for portable medical sensors, handheld test equipment, and industrial process controllers requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for REF3220AIDBVTG4 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision analog signal chains and power management.

The REF32xx family was engineered specifically for high-accuracy, low-power applications demanding sub-10ppm/°C drift and force-sense regulation-targeting portable instrumentation, medical diagnostics, and industrial data acquisition where reference integrity directly impacts measurement validity.

FAQ

What is the maximum allowable voltage difference between GND_S and GND_F on the REF3220AIDBVTG4?

The REF3220AIDBVTG4 specifies a maximum differential voltage of 200mV between GND_S and GND_F pins. Exceeding this threshold risks forward-biasing internal ESD protection diodes, causing unpredictable output behavior or increased quiescent current. This limit ensures reliable operation of the force-sense feedback loop and is critical when routing GND_S to remote load points in high-precision layouts. Always verify voltage drop across PCB traces connecting these grounds remains below 200mV under worst-case load conditions.

Does the REF3220AIDBVTG4 require an external bypass capacitor for stability?

No, the REF3220AIDBVTG4 is internally compensated and stable with any capacitive load-including zero capacitance-eliminating mandatory external bypass components. However, a 0.47μF ceramic capacitor placed close to the IN pin is recommended to suppress high-frequency supply noise and improve PSRR. Unlike many references, it does not exhibit peaking or oscillation with large (>10μF) output capacitors, making it ideal for systems with varying load capacitance across revisions or configurations.

Can the ENABLE pin of the REF3220AIDBVTG4 be tied directly to the IN pin?

Yes, the ENABLE and IN pins of the REF3220AIDBVTG4 can be tied together if the input voltage rise time is ≤2ms. For slower ramps (e.g., linear regulators or battery charging circuits), ENABLE must be held below 0.7V until IN reaches V_OUT + 5mV (≈2.053V). TI provides RC filter design guidelines (e.g., 150kΩ + 100nF for REF3240) to delay ENABLE activation-applicable to REF3220AIDBVTG4 with minor timing adjustment per Table 6-2 (0.5ms minimum).

What is the typical output voltage noise of the REF3220AIDBVTG4 in the 0.1Hz to 10Hz band?

The REF3220AIDBVTG4 exhibits 27µV_PP (typical) output voltage noise in the 0.1Hz to 10Hz band, as measured per JEDEC JESD22-A121. This low flicker noise supports high-resolution DC measurements in medical and metrology applications. Noise increases linearly with output voltage across the REF32xx family (e.g., REF3240 shows 53µV_PP), confirming the 27µV_PP value is specific to the 2.048V variant and validated in production testing-not extrapolated or estimated.

How does the REF3220AIDBVTG4 achieve 5mV dropout voltage?

The REF3220AIDBVTG4 achieves 5mV dropout through a proprietary CMOS pass-element design that minimizes on-resistance and gate-drive overhead in the reference's output buffer stage. This architecture allows regulation even when input voltage is only 5mV above the 2.048V nominal output-verified across temperature and load (0–10mA). Dropout remains ≤50mV maximum over full operating range, enabling use with ultra-low-headroom supplies like single-cell LiFePO₄ (2.8–3.6V) powering a 2.048V rail.