Integrated Circuits

High Precision Voltage Reference (ATREF500)

The ATREF500 series delivers a stable, ultralow-noise reference voltage for high-resolution ADCs and DACs, precision data acquisition systems, optical control loops, and medical instrumentation. Key features:

• Initial accuracy: ±1μV trimmed
• Zero radiated EMI (no internal switching)
• Ultralow output noise: 100nV_P-P, 0.1Hz to 10Hz
• Wide operating temperature: −40°C to +125°C
• High output drive: +10mA source / −5mA sink
• Low dropout (headroom): 500mV
• 100% Pb-free, RoHS compliant

Ultralow Noise MEMS Microphones

ATI offers four surface-mount omni-directional MEMS microphones covering the common combinations of port location (top / bottom) and output type (analog / digital PDM), all with high SNR, flat wideband response, and built-in EMI/RF filtering for immunity in wireless-heavy environments:

• AT6216 — Analog output, top-ported, 2.75 × 1.85 × 1.00 mm
• AT6856 — Analog output, bottom-ported, integrated MEMS element + preamplifier
• AT6577 — Digital PDM output, bottom-ported, 2.75 × 1.85 × 0.90 mm
• AT6538 — Digital PDM output, top-ported, ±1dB sensitivity tolerance, ±2dB to 12kHz

All four parts are reflow-solder compatible with no sensitivity degradation and are Halogen- and Pb-free.

Lithium-Ion / Lithium-Polymer Battery Protection ICs

ATI battery protection ICs combine high-precision voltage detectors with programmable delay circuits to protect Li-ion / Li-polymer cells against overcharge, over-discharge, and overcurrent (charge/discharge) faults — covering both single-cell portable applications and multi-cell power packs.

• AT8254 series — Protection IC for 3-series or 4-series Li-ion / Li-polymer packs. A single SEL pin selects between 3S and 4S operation, simplifying inventory for pack manufacturers.
• AT1002 series — Single-cell Li-ion / Li-polymer protection IC with integrated voltage sensing, current sensing, and delay circuits for overcharge, over-discharge, and overcurrent protection.

Bi-Directional Relay / DC-Motor Driver — AT8023D

The AT8023D is an ultralow-power bi-directional H-bridge driver used to control small DC motors and — in particular — magnetic latching relays in smart electricity meters and residential energy-management systems. It accepts inputs up to 40V (30V recommended limit), integrates a fast free-wheel diode to eliminate the need for external TVS clamps, and provides a 1.5V-threshold logic input that interfaces directly with 3.3V and 5V MCUs. Packaged in SOT23-6. Typical applications include smart meters, load-switching modules, pulse and level-controlled solenoids, and battery-powered latching-relay circuits where quiescent current must be near zero.

Precision CMOS Operational Amplifiers

Small-signal sensing — thermistors, RTDs, current shunts, photodiodes, bridge sensors — demands op amps with low offset voltage, low 1/f noise, and low drift over temperature. ATI's op-amp portfolio covers zero-drift auto-zero parts for DC-accurate sensing, rail-to-rail I/O CMOS parts for low-voltage battery designs, and high-speed voltage-feedback parts for ADC/DAC buffering. The flagship AT8551 is a pin-compatible upgrade to the AD8551 with lower offset (<5μV vs. 10μV), lower 0.1Hz–10Hz noise (<0.75μV_P-P vs. 1μV_P-P), higher slew rate (2.7V/μs vs. 0.4V/μs), higher bandwidth (4.5MHz vs. 1.5MHz), and lower price ($0.78 vs. $1.25 @1000 pcs).

Step-Down DC-DC (Buck) Converters

A step-down DC-DC converter — also called a buck converter, buck regulator, or step-down switching regulator — converts a higher-voltage input rail to a lower-voltage regulated output at efficiency typically above 90%, with far lower power dissipation than a linear LDO. ATI's buck converter portfolio spans 4V to 42V input and 0.6A to 2A output, and includes both non-synchronous parts (with integrated high-side MOSFET) for high-Vin industrial rails, and synchronous parts for battery-powered designs where light-load efficiency matters. The ATDC1934 and ATDC2934 are pin- and application-compatible with LT1934-class parts but deliver 2× the output current. Evaluation boards (ATDC1934EV1, ATDC2934EV1, ATI2202EV1) are available for fast prototyping.