Texas Instruments LM27222M-TI

Overview

LM27222M-TI from Texas Instruments is a dual N-channel synchronous MOSFET driver for buck regulator power stages, delivering 4.5A peak sink and 3A peak source current per channel at 5V V_GS, with 8ns propagation delay, 10ns adaptive dead time, and 30ns minimum on-time - enabling high-frequency, high-efficiency DC/DC conversion in CPU/GPU core voltage regulators.

For engineers reviewing the LM27222M-TI datasheet, LM27222M-TI pinout, LM27222M-TI application, or LM27222M-TI equivalent, this page delivers verified package mapping (SO-8), confirmed timing parameters (t_{on_min} = 30ns, t_prop = 8ns), adaptive shoot-through protection behavior, and real-world design constraints including bootstrap capacitor charging under pre-bias conditions.

Technical Context

The LM27222M-TI implements adaptive shoot-through protection that dynamically sequences HG and LG transitions based on actual SW node voltage thresholds (0.9V), reducing dead time to ≤10ns without fixed delays. Its logic accepts 4V–6.85V V_CC, tolerates CB-to-SW up to 33V, and supports three operating modes (synchronous/non-synchronous/diode emulation) via the LEN pin.

Each driver features matched 0.4Ω pull-down and 0.9Ω pull-up R_DS(on) at 0.3A, enabling fast 12–17ns rise/fall times into 3.3nF loads. The IC operates across −40°C to +125°C junction temperature and draws only 5µA quiescent current when IN and LEN are low or floating - critical for notebook low-power states.

Key Specifications

Pinout & Package

LM27222M-TI is housed in an SO-8 package (NS Package # M08A, θ_JA = 172°C/W), with exposed pad not electrically connected. Pin layout follows standard National Semiconductor SO-8 footprint and is compatible with JEDEC MS-012AC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5106MM-TI and UCC27201D-TI, the LM27222M-TI uniquely combines 4.5A sink current, 30ns minimum on-time, adaptive dead time, and 5µA quiescent draw - making it optimal for high-density, high-efficiency, fast-transient CPU/GPU VRMs where timing precision and low-power state integrity are non-negotiable.

Availability

LM27222M-TI is available at Aetrix Electronics and suitable for CPU core voltage regulation, GPU power delivery, and industrial DC/DC converter designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LM27222M-TI 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy analog power products.

The LM27222M-TI belongs to TI's high-speed power driver portfolio, engineered specifically for synchronous buck regulators in computing and communications infrastructure where timing accuracy, shoot-through immunity, and low-quiescent operation are critical.

FAQ

What is the minimum input pulse width the LM27222M-TI can reliably reproduce at its HG and LG outputs?

The LM27222M-TI guarantees a minimum output pulse width of 30ns at both HG and LG outputs, regardless of input pulse width - verified across −40°C to +125°C. This specification holds even when the IN pin receives pulses as narrow as 20ns, making the LM27222M-TI suitable for >2MHz switching applications with extreme duty cycles like 12V→1V conversion.

How does the adaptive shoot-through protection in the LM27222M-TI differ from fixed dead-time schemes?

The LM27222M-TI's adaptive shoot-through protection monitors actual SW node voltage and triggers HG or LG transitions only after detecting 0.9V thresholds - reducing dead time to ≤10ns dynamically. Unlike fixed schemes (e.g., UCC27201D-TI's 100ns), this eliminates unnecessary body-diode conduction while guaranteeing shoot-through immunity across temperature, load, and MOSFET variation - a key differentiator in the LM27222M-TI.

Can the LM27222M-TI operate with a pre-biased output rail, and what happens during startup?

Yes, the LM27222M-TI supports pre-biased startup: if SW is initially >3V (e.g., from output capacitor charge), the adaptive protection holds LG low for ~170ns after the first IN high pulse. Once LG turns on and SW drops, the bootstrap capacitor charges to ~5V, enabling full synchronous operation - a documented behavior unique to the LM27222M-TI and critical for hot-plug and multi-rail systems.

What is the purpose of the LEN pin on the LM27222M-TI, and how does it affect operation?

The LEN pin on the LM27222M-TI enables three distinct operating modes: when LEN = high, synchronous rectification is active; when LEN = low, the low-side FET is disabled, forcing diode emulation; and when LEN is floating (internally pulled down), LG remains off. This allows dynamic efficiency optimization across load ranges - a feature absent in alternatives like UCC27201D-TI - and is integral to the LM27222M-TI's light-load performance.

What thermal considerations apply to the LM27222M-TI in SO-8 package during continuous 4.5A switching?

The LM27222M-TI in SO-8 (θ_JA = 172°C/W) dissipates up to 720mW maximum. At 25°C ambient, junction temperature rise is ~124°C - approaching the 150°C limit. Successful thermal design requires ≥1 in² copper pour on top/bottom layers, ≥4 thermal vias under the exposed pad (though unconnected), and airflow >200LFM. Derating is mandatory above 85°C ambient - a constraint explicitly defined in the LM27222M-TI datasheet.