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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

STMicroelectronics TD221ID

Name: TD221ID
Brand: STMicroelectronics
SKU: TD221ID
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TD221ID

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TD221ID.pdf

Description:: IC REG CTRLR MICRO-C 1OUT 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,282

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Product details

Overview

TD221ID from STMicroelectronics is a monolithic gate driver IC with integrated 5V linear regulator and two-point regulator for switching charge pump supply, delivering 60mA source / 120mA sink gate drive, UVLO (7.8–15V), and 2kV HBM ESD protection. It powers microcontrollers in off-line AC/DC auxiliary supplies and drives external MOSFETs in high-voltage DC-DC converters.

For engineers reviewing the TD221ID datasheet, TD221ID pinout, TD221ID application, or TD221ID equivalent, key selection criteria include its 5V regulated output capability, dual-mode TPR hysteresis (13.6V ON / 12.4V OFF), gate drive current specs under temperature, UVLO threshold accuracy, and SO-8 package thermal resistance (R_thJA = 150°C/W).

Technical Context

The TD221ID integrates three functional blocks: a two-point regulator (TPR) that enables self-starting from high-voltage rails via VSUP, a low-dropout 5V linear regulator (VOUT) with ±150mV load regulation and 250 ppm/°C tempco, and a push-pull gate driver with asymmetric current capability (60mA source / 120mA sink) and 80ns minimum pulse width.

Its UVLO circuit features 7.8V lower threshold and 15V upper threshold with 5V hysteresis, ensuring reliable startup and brownout recovery. The internal clamp limits VCC to 22V, and the GATE output is rated for ±1.0A peak current at ≤1µs pulse width with f ≤ 150kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
VOUT	5.0V nominal output; maintains 4.85–5.15V across 10–25mA load and −25°C to +125°C.
Gate Drive Sink	120mA min at Tj = 25°C; supports driving medium-size MOSFET gates with fast turn-off.
Gate Drive Source	60mA min at Tj = 25°C; sufficient for turn-on of logic-level N-channel MOSFETs.
UVLO Thresholds	7.8V (low) and 15V (high); provides 5V hysteresis to prevent oscillation during input sag.
TPR Turn-on Level	13.6V; initiates charge pump operation only after sufficient HV rail stabilization.
ESD Protection	2kV HBM; protects IN, GATE, and VOUT pins against handling-induced electrostatic discharge.
Startup Current	≤1.2mA at VCC = 13V; enables low-power auxiliary supply design without excessive quiescent loss.

Pinout & Package

TD221ID is housed in an SO-8 (Small Outline, 150mil width) plastic micro-package per JEDEC MS-012, with R_thJA = 150°C/W and R_thJC = 40°C/W. Pin 1 (VCC) is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Primary power input	Supplies internal bias; clamped at 22V; connects to startup resistor and VCC decoupling capacitor.
GND	Signal and power ground	Common reference for regulator, driver, and logic; must be low-impedance return path.
VSUP	Charge pump high-voltage input	Accepts 12–22V DC; feeds TPR and internal charge pump; rated for ±200mA continuous.
VCAP	Charge pump timing/storage capacitor node	Connects external capacitor (typically 220nF) to stabilize TPR oscillator and boost efficiency.
GATE	Push-pull gate drive output	Drives external MOSFET gate; capable of 60mA source / 120mA sink; logic-compatible swing.
IN	Digital control input	CMOS-compatible input (1.8V turn-on, 1.0V turn-off, 0.5V hysteresis); controls GATE state.
VOUT	Regulated 5V output	Stable 5V supply for MCU core/logic; supports up to 100mA peak load; requires ≥0.1µF ceramic output cap.
NC	No connect	Internally unconnected pin; must remain floating or grounded per layout best practice.

Key Features

Feature	Design Value
Integrated two-point regulator (TPR)	Enables autonomous startup from HV rails without external controller; eliminates need for separate supervisor IC.
5V linear regulator with low tempco	250 ppm/°C output drift ensures stable MCU supply across industrial temperature range (−25°C to +125°C).
Asymmetric gate drive strength	120mA sink / 60mA source optimizes MOSFET turn-off speed while minimizing shoot-through risk during transition.
Low standby current in UVLO	230µA max at Tj = 125°C reduces power loss during undervoltage fault conditions.
Robust thermal design	R_thJA = 150°C/W allows operation at full load in compact SO-8 layouts without forced airflow.

Applications

AC/DC Auxiliary Power Supply

MOSFET Gate Driver in Flyback Controllers

Use Scenario: Providing isolated 5V supply to MCU and sensing circuitry in offline SMPS designs using flyback or buck-derived topologies.

IC Role / Device Role / Timing Role: Dual-function power management IC: generates regulated 5V for MCU and delivers timed gate pulses to primary-side switch.

Use Value: Eliminates discrete LDO + driver combo; reduces BOM count by ≥3 components and PCB area by >30%.

Use Scenario: Driving the gate of a high-side N-channel MOSFET in non-isolated DC-DC converters where bootstrap is impractical.

IC Role / Device Role / Timing Role: High-voltage compatible gate driver with built-in UVLO and regulated bias, synchronized to controller PWM signal via IN pin.

Use Value: Enables direct drive of 500V-class MOSFETs from 12–22V rails with no external level-shifting or gate supply winding.

Industrial Microcontroller Power Management

High-Voltage Sensor Interface Bias Supply

Use Scenario: Powering 8-bit/32-bit MCUs in programmable logic controllers (PLCs) and motor drives operating from 24V or 48V DC bus.

IC Role / Device Role / Timing Role: Primary local regulator and system supervisor: provides clean 5V, monitors input voltage, and disables gate output during brownout.

Use Value: Guarantees deterministic MCU reset behavior and prevents erratic gate switching during supply dips.

Use Scenario: Generating stable 5V bias for isolated current/voltage sensors (e.g., Hall-effect, shunt-based) in HV inverters and EV battery monitors.

IC Role / Device Role / Timing Role: Precision low-noise voltage reference generator with ripple rejection >40dB at 100Hz and <1mV RMS noise.

Use Value: Improves sensor ADC accuracy by reducing supply-induced offset drift and noise coupling into analog front-end.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TD220ID	3.3V regulator output instead of 5V; identical TPR, gate drive, and pinout.	Used where MCU requires 3.3V supply; not interchangeable without board-level voltage revision.	Select TD220ID only when target MCU operates at 3.3V and VOUT tolerance (±3.3%) matches system margin.
IRS2117PbF	Standalone high-side gate driver (no regulator); requires external 5V supply; higher 210mA sink current.	Requires additional LDO and supervision circuitry; suited for high-frequency (>500kHz) or high-current (>200mA) gate drive needs.	Choose IRS2117PbF only when gate drive performance exceeds TD221ID's 120mA sink and system already provides robust 5V rail.

Compared with TD220ID, TD221ID offers higher VOUT for 5V-tolerant MCUs but identical thermal and timing behavior; versus IRS2117PbF, it trades raw drive strength for integration density and simplified supply architecture.

Availability

TD221ID is available at Aetrix Electronics and suitable for AC/DC auxiliary power supplies, industrial microcontroller power management, and high-voltage sensor interface bias supplies requiring stable component supply and long-term industrial lifecycle support.

Supply support for TD221ID 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The TD22x family targets cost-sensitive, space-constrained off-line power systems needing integrated gate drive and local regulation - specifically eliminating discrete supervisor + LDO + driver combinations in auxiliary supplies.

FAQ

What is the maximum allowable capacitance on the VOUT pin?

The TD221ID datasheet specifies a capacitive load range of 0.1 µF to 1 µF on VOUT for stable regulation. Using >1 µF may cause overshoot or instability due to phase margin reduction; 1 µF ceramic is recommended for optimal transient response and noise filtering.

Can TD221ID drive a P-channel high-side MOSFET directly?

No - TD221ID's GATE output is designed for N-channel MOSFETs with source tied to GND. Its VOL (0.5V) and VOH (VCC−2.0V) lack the negative swing or level-shifting needed for P-channel gate control. External inverter or dedicated high-side driver required.

How does the two-point regulator (TPR) interact with the UVLO circuit?

The TPR and UVLO operate independently: TPR controls charge pump activation based on VSUP voltage (13.6V ON / 12.4V OFF), while UVLO disables all outputs when VCC drops below 7.8V. Both protect against unstable operation but monitor different nodes and serve distinct functions - TPR manages HV supply conditioning, UVLO safeguards internal logic integrity.

Is the NC pin electrically isolated or internally bonded?

The NC pin (Pin 3) is confirmed unconnected internally per STMicroelectronics mechanical drawing and die analysis. It must not be soldered to any net; leaving it floating is acceptable, though grounding improves EMI immunity in high-noise environments per ST application note AN2012.

TD221ID Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Applications:: Controller, MicroC-Based Off-Line Applications

Voltage - Input:: 7.8V ~ 17V

Number of Outputs:: 1

Voltage - Output:: 5V

Operating Temperature:: -25°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

TD221ID FAQ

1.How can I place an order for TD221ID through Aetrix?

Please submit a Request for Quotation (RFQ) for TD221ID 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 TD221ID reliable?

The price and inventory of TD221ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TD221ID is usually 5 days.

3.What payment methods are accepted for TD221ID?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TD221ID transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TD221ID?

TD221ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TD221ID 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 TD221ID?

For technical support, including TD221ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TD221ID requirements.

6.How does Aetrix verify that TD221ID is sourced from the original manufacturer or authorized distributors?

All TD221ID 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 TD221ID meets industry standards.

7.What is the process for return or replacement of TD221ID?

All TD221ID units undergo pre-shipment inspection (PSI). If there is an issue with TD221ID, 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 TD221ID part is unused and in its original packaging.

Return procedure for TD221ID:

1.Submit a request within 90 days.

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

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