Texas Instruments UCC27221PWP

Overview

UCC27221PWP from Texas Instruments is an inverting synchronous buck gate driver IC with Predictive Gate Drive (PGD) technology, ±3.3-A peak output current, 6.5-V on-board gate drive regulator, and thermally enhanced 14-pin PowerPAD HTSSOP package. It minimizes body-diode conduction and reverse recovery losses in high-efficiency DC-DC converters for processor power supplies.

For engineers reviewing the UCC27221PWP datasheet, UCC27221PWP pinout, UCC27221PWP application, or UCC27221PWP equivalent, this page delivers verified technical context, real-world timing behavior, confirmed deadtime adjustability, thermal performance data, and validated alternative options for synchronous rectifier control in 8.5–20 V input systems.

Technical Context

The UCC27221PWP implements a digital predictive delay controller that detects SR MOSFET body-diode conduction via SWS and G2S inputs, then adjusts tON,G1 and tON,G2 in discrete ~3.5 ns steps per cycle to minimize conduction time-without external components or user tuning. Its dual-output TrueDrive stage delivers ±3.3 A peak into 2.2 nF loads with 17–25 ns rise/fall times.

It integrates a 6.5-V linear regulator (VLO) with 6.1–6.9 V output range, 7.1–8.5 V dropout at 100 mA, and UVLO thresholds of 3.30–4.40 V (start) and 3.15–4.25 V (operating), enabling stable operation across 8.5–20 V VDD inputs. The inverting PWM input (IN) directly controls high-side (G1) turn-on and low-side (G2) turn-off with fixed tOFF delays and dynamically adjusted tON windows.

Key Specifications

Pinout & Package

UCC27221PWP uses the thermally enhanced 14-pin PowerPAD HTSSOP (PWP) package with exposed thermal pad soldered to PCB ground plane for optimal heat transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27221PWP, UCC27222PWP offers identical efficiency and thermal performance but requires non-inverting PWM signaling, whereas LM5113SD trades predictive timing for higher peak current and simpler control-making it suitable only where body-diode conduction losses are secondary to gate drive strength.

Availability

UCC27221PWP is available at Aetrix Electronics and suitable for server VRMs, telecom point-of-load converters, industrial PLC power supplies, and network switch ASIC core rails requiring stable component supply and long-term production continuity.

Supply support for UCC27221PWP 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 decades of innovation in high-efficiency power conversion solutions.

The UCC27221PWP belongs to TI's synchronous buck gate driver product line, designed specifically to maximize efficiency in high-current, low-voltage DC-DC converters by eliminating synchronous rectifier body-diode conduction through predictive timing control.

FAQ

What is the key functional difference between UCC27221PWP and UCC27222PWP?

The UCC27221PWP features an inverting PWM input (IN), meaning a logic high on IN turns on the high-side MOSFET (G1) and turns off the low-side MOSFET (G2). In contrast, the UCC27222PWP has a non-inverting input: a logic high on IN turns on both G1 and G2 simultaneously. All other specifications-including Predictive Gate Drive functionality, pinout, thermal performance, and regulator characteristics-are identical between UCC27221PWP and UCC27222PWP.

Does UCC27221PWP require external components to implement Predictive Gate Drive?

No, UCC27221PWP implements Predictive Gate Drive entirely internally using digital feedback loops stabilized without external components. The SWS and G2S pins connect directly to the synchronous rectifier drain and gate respectively to provide real-time sensing, and the device autonomously adjusts tON,G1 and tON,G2 in discrete ~3.5 ns steps each cycle-no resistors, capacitors, or configuration registers are needed to enable or tune PGD in UCC27221PWP.

Can UCC27221PWP operate from a 5-V-only input supply?

Yes, UCC27221PWP supports 5-V-only operation using an external charge pump (D3, D4, C3) to double the input voltage and feed the internal VLO regulator. As documented in Figure 6 of the SLUS486B datasheet, this configuration generates the required 6.5-V gate drive rail from a 5-V bus-enabling compact, single-rail designs without needing a separate 12-V bias supply for UCC27221PWP.

What is the maximum gate charge (Qg) that UCC27221PWP can reliably drive?

UCC27221PWP is rated to reliably drive MOSFETs with up to approximately 120 nC total gate charge while maintaining full Predictive Gate Drive functionality and sub-25 ns edge speeds. Exceeding this limit extends rise/fall times and reduces the effective deadtime adjustment range, potentially compromising body-diode elimination-especially in high-frequency or parallel-MOSFET configurations where cumulative Qg exceeds 120 nC.

How does the PowerPAD HTSSOP package improve thermal performance of UCC27221PWP?

The PowerPAD HTSSOP (PWP) package incorporates an exposed copper thermal pad beneath the UCC27221PWP die, which must be soldered to a large PCB copper area connected to ground. This structure achieves a junction-to-case thermal resistance (θjc) of just 2 °C/W-reducing steady-state junction temperature rise by over 30% compared to standard SOIC packages-and enables UCC27221PWP to dissipate up to 3 W at TA = 25°C without forced airflow.