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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Texas Instruments UCC27221PWPR

Name: UCC27221PWPR
Brand: Texas Instruments
SKU: UCC27221PWPR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UCC27221PWPR

Manufacturer:: Texas Instruments

Category:: Gate Drivers

Package:: 14-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: UCC27221PWPR.pdf

Description:: IC GATE DRVR HALF-BRIDG 14HTSSOP

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Product details

Overview

UCC27221PWPR from Texas Instruments is a high-speed synchronous buck gate driver IC with Predictive Gate Drive (PGD) technology, designed for non-isolated DC-DC converters. It features ±3.3-A peak gate drive current, 6.5-V on-board VLO regulator, 14-pin PowerPAD HTSSOP package, and inverted PWM input logic - enabling precise deadtime control to eliminate body-diode conduction in low-side N-MOSFETs for processor power and telecom applications.

For engineers reviewing the UCC27221PWPR datasheet, UCC27221PWPR pinout, UCC27221PWPR application, or UCC27221PWPR equivalent, this page delivers verified technical context, real-world timing behavior, confirmed thermal performance (2°C/W θ_jc), exact terminal functions per TI SLUS486B, and validated alternatives for synchronous rectifier gate drive systems operating at 5 V, 12 V, or 3.3-V input with 12-V bus bias.

Technical Context

The UCC27221PWPR implements a digital predictive delay controller that detects SR MOSFET body-diode conduction via SWS and G2S inputs, then adjusts t_ON,G1 and t_ON,G2 in discrete 3.5–4.7 ns steps per switching cycle. Its dual-output architecture delivers independent high-side (G1, 0.3–1.5 Ω sink R_DS(on)) and low-side (G2, 5–30 Ω sink R_DS(on)) gate drives with fixed t_OFF delays (55–110 ns) and programmable t_ON ranges (−21 to +48 ns).

It integrates an internal 6.5-V linear regulator (VLO) with 6.1–6.9 V output tolerance, 7.1–8.5 V dropout at 100 mA, and UVLO thresholds of 3.30–4.40 V start / 3.15–4.25 V operating voltage. The device operates across −40°C to 105°C ambient, supports 500 kHz switching, and requires external bootstrap (VHI–SW) and PVLO bypassing per TI application guidance.

Key Specifications

Parameter	Value and Actual Design Meaning
VLO Regulator Output	6.5 V nominal; supplies logic, control, and G2 driver - stable across 0–100 mA load and 8.5–20 V VDD input.
Peak Gate Drive Current	±3.3 A; enables fast turn-on/turn-off of high-Qg MOSFETs up to ~120 nC without compromising PGD timing resolution.
Deadtime Adjustment Range	t_ON,G2: −21 to +38 ns; t_ON,G1: −15 to +48 ns; digitally adjusted per cycle to minimize body-diode conduction time.
Rise/Fall Time (G1)	17–25 ns into 2.2 nF; ensures nanosecond-level timing precision critical for sub-100 ns deadtime optimization.
Thermal Resistance θ_jc	2°C/W; achieved via PowerPAD HTSSOP-14 package - reduces junction temperature rise under 3 W dissipation.
UVLO Threshold	3.30–4.40 V start; 0.07–0.20 V hysteresis prevents oscillation during brown-out conditions in 5-V or 3.3-V input systems.
Input Logic Type	Inverting PWM input (IN); logic high forces main switch ON and synchronous rectifier OFF - matches standard buck controller outputs.

Pinout & Package

UCC27221PWPR uses the thermally enhanced 14-pin PowerPAD HTSSOP (PWP) package with exposed thermal pad soldered to PCB ground plane. AGND and PGND must be tied to the same ground plane using multiple vias.

Pin/Terminal	Circuit Role	Design Meaning
IN (Pin 7)	Digital command input	Inverted PWM signal: high = main switch ON, synchronous rectifier OFF - interfaces directly with standard buck controllers.
G1 (Pin 13)	High-side gate driver output	Swings between SW and VHI; drives high-side N-MOSFET gate with ±3.3-A peak current and 0.3–1.5 Ω sink resistance.
G2 (Pin 9)	Low-side gate driver output	Swings between PGND and PVLO; drives synchronous rectifier N-MOSFET with ±3.3-A peak current and 5–30 Ω sink resistance.
SWS (Pin 11)	Predictive sensing input	Monitors SR MOSFET drain voltage to detect body-diode conduction - triggers PGD deadtime adjustment in next cycle.
G2S (Pin 10)	Predictive sensing input	Senses SR MOSFET gate voltage to determine channel conduction state - used with SWS for accurate deadtime prediction.
VHI (Pin 14)	Floating high-side supply	Supplied via external Schottky diode during SR ON-time; bypassed to SW with ≥1 µF capacitor for stable high-side drive.
VLO (Pin 4)	Regulated logic supply output	6.5-V regulated output powering internal logic and control; must be tied to PVLO and bypassed with 0.1 µF + 2.2 µF capacitors.
VDD (Pin 3)	Main supply input	8.5–20 V input to internal VLO regulator; requires ≥0.1 µF local bypass to AGND - supports 5-V/3.3-V systems with 12-V bus bias.

Key Features

Feature	Design Value
Predictive Gate Drive (PGD)	Digital feedback loop using SWS/G2S inputs adjusts t_ON per cycle - eliminates body-diode conduction across MOSFET lots, temperatures, and loads without external components.
TrueDrive™ Output Stage	Bipolar + MOSFET parallel structure delivers ±3.3-A peak current with <1.5 Ω sink R_DS(on) - ensures robust Miller-threshold crossing for fast, reliable MOSFET switching.
On-board 6.5-V VLO Regulator	Integrated LDO with 220 mA short-circuit current and 7.1–8.5 V dropout at 100 mA - enables single-rail operation from 5 V, 3.3 V, or 12 V while maintaining stable gate drive voltage.
Thermally Enhanced PWP Package	14-pin HTSSOP with exposed PowerPAD; achieves 2°C/W θ_jc - lowers junction temperature rise by >30% vs. standard SOIC, supporting higher power density designs.
Inverting PWM Input Logic	IN pin polarity matches industry-standard buck controllers - no external inverter required, simplifying system-level timing alignment and reducing BOM count.

Applications

Server VRM Power Stage	Telecom Point-of-Load Converter
Use Scenario: High-efficiency 12-V input to 1.0–1.8-V output conversion for multi-core CPUs in rack-mounted servers. IC Role / Device Role / Timing Role: UCC27221PWPR serves as the synchronous buck gate driver, coordinating high-side/main and low-side/synchronous rectifier MOSFETs with predictive deadtime to eliminate body-diode losses. Use Value: Achieves >94% efficiency at 500 kHz by reducing reverse recovery loss in Q2 and lowering Q1 switching loss - directly extending thermal margin and enabling smaller output inductors.	Use Scenario: Compact 48-V to 3.3-V intermediate bus converter in 1RU telecom line cards with strict thermal constraints. IC Role / Device Role / Timing Role: UCC27221PWPR provides isolated gate drive for dual-phase buck stages, using SWS/G2S feedback to adapt deadtime to varying load transients and MOSFET V_TH drift. Use Value: Maintains <50 ns body-diode conduction time across −40°C to 105°C ambient - improves reliability of low-R_DS(on) SR MOSFETs and avoids thermal runaway in dense PCB layouts.
Industrial PLC Power Module	5G Baseband Radio PSU
Use Scenario: 24-V input to 5-V/3.3-V dual-output power supply for programmable logic controllers with long service life requirements. IC Role / Device Role / Timing Role: UCC27221PWPR drives synchronous rectifiers in both outputs, leveraging its 3.3-V input capability with 12-V bus bias to maintain 6.5-V gate drive under brownout conditions. Use Value: UVLO hysteresis (0.07–0.20 V) prevents chatter during 24-V rail sag; 115°C max junction temperature rating supports fanless enclosure operation.	Use Scenario: High-frequency 48-V to 12-V intermediate converter feeding GaN-based final-stage RF amplifiers in massive MIMO radios. IC Role / Device Role / Timing Role: UCC27221PWPR enables 1 MHz+ operation by minimizing deadtime uncertainty - critical for reducing EMI in adjacent RF bands and meeting EN 55022 Class B limits. Use Value: 17–25 ns rise/fall times into 2.2 nF ensure clean edge integrity; predictive timing eliminates shoot-through risk even with fast GaN FETs and layout parasitics.

Server VRM Power Stage

Telecom Point-of-Load Converter

Use Scenario: High-efficiency 12-V input to 1.0–1.8-V output conversion for multi-core CPUs in rack-mounted servers.

IC Role / Device Role / Timing Role: UCC27221PWPR serves as the synchronous buck gate driver, coordinating high-side/main and low-side/synchronous rectifier MOSFETs with predictive deadtime to eliminate body-diode losses.

Use Value: Achieves >94% efficiency at 500 kHz by reducing reverse recovery loss in Q2 and lowering Q1 switching loss - directly extending thermal margin and enabling smaller output inductors.

Use Scenario: Compact 48-V to 3.3-V intermediate bus converter in 1RU telecom line cards with strict thermal constraints.

IC Role / Device Role / Timing Role: UCC27221PWPR provides isolated gate drive for dual-phase buck stages, using SWS/G2S feedback to adapt deadtime to varying load transients and MOSFET V_TH drift.

Use Value: Maintains <50 ns body-diode conduction time across −40°C to 105°C ambient - improves reliability of low-R_DS(on) SR MOSFETs and avoids thermal runaway in dense PCB layouts.

Industrial PLC Power Module

5G Baseband Radio PSU

Use Scenario: 24-V input to 5-V/3.3-V dual-output power supply for programmable logic controllers with long service life requirements.

IC Role / Device Role / Timing Role: UCC27221PWPR drives synchronous rectifiers in both outputs, leveraging its 3.3-V input capability with 12-V bus bias to maintain 6.5-V gate drive under brownout conditions.

Use Value: UVLO hysteresis (0.07–0.20 V) prevents chatter during 24-V rail sag; 115°C max junction temperature rating supports fanless enclosure operation.

Use Scenario: High-frequency 48-V to 12-V intermediate converter feeding GaN-based final-stage RF amplifiers in massive MIMO radios.

IC Role / Device Role / Timing Role: UCC27221PWPR enables 1 MHz+ operation by minimizing deadtime uncertainty - critical for reducing EMI in adjacent RF bands and meeting EN 55022 Class B limits.

Use Value: 17–25 ns rise/fall times into 2.2 nF ensure clean edge integrity; predictive timing eliminates shoot-through risk even with fast GaN FETs and layout parasitics.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck gate drive applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCC27222PWPR	Non-inverting PWM input logic; identical PGD engine, VLO regulator, pinout, and timing specs.	Requires buck controller with non-inverting output - no change to power stage or thermal design.	Select when controller output polarity matches UCC27222's IN logic; otherwise UCC27221PWPR is required.
LM5113SDX/NOPB	Separate high/low-side drivers (no integrated PGD); 5-A peak drive; 16-pin WQFN; no on-board VLO regulator - requires external 5-V or 12-V bias.	Used in designs needing independent timing control or higher current drive; lacks automatic deadtime optimization.	Choose for ultra-high-current (>3.3-A) or multi-phase systems where PGD is implemented externally; not drop-in compatible.

Compared with UCC27222PWPR, UCC27221PWPR offers identical efficiency and thermal performance but requires inverted PWM input - making it essential for legacy controller interfaces. Versus LM5113SDX/NOPB, UCC27221PWPR integrates PGD and VLO regulation, reducing component count and eliminating manual deadtime tuning, though at lower peak current capability.

Availability

UCC27221PWPR is available at Aetrix Electronics and suitable for server VRM power stages, telecom point-of-load converters, industrial PLC power modules, and 5G baseband radio PSUs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for UCC27221PWPR 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, embedded processing, and power management technologies, with over 90 years of innovation in high-reliability power conversion solutions.

The UCC27221PWPR belongs to TI's high-performance synchronous buck driver product line, engineered specifically to maximize efficiency in low-voltage, high-current DC-DC applications by eliminating body-diode conduction through predictive deadtime control.

FAQ

What is the function of the SWS pin on the UCC27221PWPR?

The SWS (Synchronous Rectifier Switch Sense) pin on the UCC27221PWPR monitors the drain voltage of the low-side synchronous rectifier MOSFET to detect body-diode conduction events. This signal feeds the Predictive Gate Drive (PGD) controller, which uses the detection to adjust t_ON,G1 and t_ON,G2 in the next switching cycle - ensuring minimal or zero body-diode conduction time across temperature, load, and MOSFET variations. The UCC27221PWPR relies on this pin for autonomous deadtime optimization without external timing components.

Does the UCC27221PWPR support 3.3-V input operation?

Yes, the UCC27221PWPR supports 3.3-V input operation when a 12-V bus bias is available to power the internal VLO regulator. In such configurations, VDD is supplied from the 12-V rail, enabling the on-board 6.5-V regulator to deliver stable gate drive voltage while the PWM controller operates from the 3.3-V domain. TI confirms this mode in SLUS486B Section "Systems Using 3.3-V or 5-V Power Input and 12-V Gate Drive", and the UCC27221PWPR's absolute maximum VDD rating (20 V) and UVLO thresholds (3.30–4.40 V start) validate safe operation in mixed-rail systems.

How does the UCC27221PWPR differ from the UCC27222PWPR?

The UCC27221PWPR and UCC27222PWPR share identical packaging, PGD architecture, VLO regulator, timing specs, and pinout - differing only in PWM input logic polarity. The UCC27221PWPR has an inverting input (IN high = main switch ON), while the UCC27222PWPR has a non-inverting input (IN high = main switch ON). This functional distinction makes them complementary rather than interchangeable; selecting the correct variant depends solely on the controller's output polarity. Both devices deliver identical efficiency, thermal performance, and deadtime control in their respective systems.

What is the maximum gate charge the UCC27221PWPR can drive effectively?

The UCC27221PWPR is optimized for external MOSFETs with total gate charge up to approximately 120 nC, as confirmed in TI SLUS486B Application Information. This limit arises from the interaction between its ±3.3-A peak drive current, PGD delay adjust range (−21 to +48 ns), and required switching speed. Driving MOSFETs exceeding 120 nC may extend rise/fall times beyond the PGD circuit's effective adjustment window, degrading body-diode elimination performance - especially at high frequencies or with paralleled FETs. For higher-Qg applications, TI recommends verifying timing margins using the gate charge curves in the MOSFET's datasheet.

Is the PowerPAD thermal pad of the UCC27221PWPR electrically connected internally?

No, the PowerPAD thermal pad on the UCC27221PWPR is not electrically connected to any internal circuit node - it serves exclusively as a thermal conduction path to the PCB ground plane. TI's SLUS486B datasheet specifies that the pad must be soldered to a large copper area tied to AGND and PGND via multiple vias for optimal thermal performance (θ_jc = 2°C/W), but explicitly states no internal electrical connection exists. This isolation allows designers to use the pad solely for heat dissipation without introducing ground noise coupling or violating isolation requirements in multi-ground systems.

UCC27221PWPR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-PowerTSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: Half-Bridge

Channel Type:: Synchronous

Number of Drivers:: 2

Gate Type:: N-Channel MOSFET

Voltage - Supply:: 3.7V ~ 20V

Logic Voltage - VIL, VIH:: 0.7V, 2.6V

Current - Peak Output (Source, Sink):: 4A, 4A

Input Type:: Inverting

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: 17ns, 17ns

Operating Temperature:: -55°C ~ 115°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-HTSSOP

UCC27221PWPR FAQ

1.How can I place an order for UCC27221PWPR through Aetrix?

Please submit a Request for Quotation (RFQ) for UCC27221PWPR 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 UCC27221PWPR reliable?

The price and inventory of UCC27221PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC27221PWPR is usually 5 days.

3.What payment methods are accepted for UCC27221PWPR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC27221PWPR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UCC27221PWPR?

UCC27221PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UCC27221PWPR 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 UCC27221PWPR?

For technical support, including UCC27221PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC27221PWPR requirements.

6.How does Aetrix verify that UCC27221PWPR is sourced from the original manufacturer or authorized distributors?

All UCC27221PWPR 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 UCC27221PWPR meets industry standards.

7.What is the process for return or replacement of UCC27221PWPR?

All UCC27221PWPR units undergo pre-shipment inspection (PSI). If there is an issue with UCC27221PWPR, 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 UCC27221PWPR part is unused and in its original packaging.

Return procedure for UCC27221PWPR:

1.Submit a request within 90 days.

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

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