STMicroelectronics TD220IDT

Overview

TD220IDT from STMicroelectronics is a monolithic gate driver IC with integrated 3.3V linear regulator and two-point regulator for offline microcontroller power supply generation. It delivers 60mA source / 120mA sink gate drive, features UVLO (7.8–15V hysteresis), 2kV HBM ESD protection, and operates from -25°C to +125°C in SO-8 package. Used in AC/DC auxiliary supplies for smart metering and industrial controllers.

For engineers reviewing the TD220IDT datasheet, TD220IDT pinout, TD220IDT application, or TD220IDT equivalent, key selection criteria include gate drive current capability under temperature, VOUT regulation accuracy (±3% at 10mA), TPR turn-on/off thresholds (13.6V/12.4V), and UVLO hysteresis (5V) - all critical for reliable startup and brownout recovery in isolated offline systems.

Technical Context

The TD220IDT integrates three functional blocks on a single die: a two-point regulator (TPR) that enables switching charge pump operation by toggling VSUP between 12.4V and 13.6V; a low-dropout 3.3V linear regulator (VOUT) with ±3% output tolerance and 100mA peak load capability; and a push-pull gate driver with asymmetric drive strength (60mA source / 120mA sink) optimized for driving external N-channel MOSFETs in high-side configurations.

Its UVLO circuit disables all outputs below 7.8V and re-enables above 15V, providing 5V hysteresis to prevent oscillation during input sag. Startup current is limited to 1.2mA max, and standby current drops to 230µA when UVLO is active - enabling energy-efficient operation in always-on auxiliary rails.

Key Specifications

Pinout & Package

TD220IDT is housed in an SO-8 (Small Outline, 150mil width) plastic micro-package with standard 1.27mm pitch, 1.75mm max height, and thermal resistance θ_JA = 150°C/W. Pin 1 (VCC) is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gate driver with integrated regulator applications.

Compared with UCC27524ADR and MAX17503GEE+T, TD220IDT uniquely combines gate drive, linear regulation, and two-point control in one SO-8 package - offering lowest BOM count and smallest footprint for low-power offline auxiliary supplies requiring programmable MOSFET control.

Availability

TD220IDT is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, white goods control boards, and AC-DC adapter auxiliary supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TD220IDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

TD220IDT belongs to ST's "Offline Power Management" product line, engineered specifically for compact, low-component-count auxiliary power supplies in microcontroller-based AC/DC and isolated DC/DC systems.

FAQ

What is the maximum allowable capacitive load on the VOUT pin?

The TD220IDT supports up to 1µF output capacitance on VOUT, as specified in the Electrical Characteristics table (Cout = 0.1–1µF). Exceeding 1µF may cause instability or overshoot during load transients. ST recommends using ceramic capacitors with X5R or X7R dielectric and ESR <100mΩ for optimal transient response and noise rejection.

Can TD220IDT drive a P-channel high-side MOSFET directly?

No - TD220IDT's GATE output is designed for N-channel MOSFET gate drive in high-side configuration, where the source connects to VSUP and the drain supplies VOUT. Its VOL2 (2V in UVLO) and VOH (VCC−2V) levels are incompatible with typical P-channel gate thresholds. External level-shifting or inverting logic is required for P-channel use.

How does the two-point regulator (TPR) interact with the VSUP pin?

The TPR monitors VSUP and toggles internal switches to maintain VSUP between 12.4V (TPROff) and 13.6V (TPROn). When VSUP drops to 12.4V, the TPR enables charge transfer from VCC to VSUP via internal diodes; when VSUP reaches 13.6V, it disables charging. This creates self-oscillating regulation without external timing components.

Is the NC pin on TD220IDT electrically isolated or internally tied?

Pin 3 (NC) is a true no-connect terminal - it has no internal bond wire or silicon connection. The datasheet explicitly states "NC" in the pin description table and requires it to remain unconnected. Soldering or routing to this pin may cause unpredictable behavior or violate thermal derating limits due to unintended parasitic coupling.