Texas Instruments CSD95379Q3M

Overview

CSD95379Q3M from Texas Instruments is a synchronous buck NexFET™ power stage integrating driver IC and dual MOSFETs for high-density point-of-load conversion. It delivers 92.5% system efficiency at 12 A, supports up to 2 MHz switching, handles 20 A continuous/45 A peak output current, and operates with 3.3-V or 5-V PWM inputs in notebook and ultrabook CPU/GPU VRMs.

For engineers reviewing the CSD95379Q3M datasheet, CSD95379Q3M pinout, CSD95379Q3M application, or CSD95379Q3M equivalent, key selection criteria include its 3.3-mm × 3.3-mm SON package, tri-state PWM/ULQ mode enabling <8 µA standby current, integrated bootstrap diode, shoot-through protection, and diode emulation with FCCM support for light-load efficiency in NVDC systems.

Technical Context

The CSD95379Q3M implements a fully integrated gate driver with adaptive zero-crossing detection for discontinuous conduction mode (DCM) and forced continuous conduction mode (FCCM), selectable via SKIP# pin logic. Its driver architecture includes UVLO (4.15 V rise / 3.7 V fall), tri-state input timing (60 ns hold-off, 100 ns exit for PWM), and internal level-shifting for high-side control FET drive.

It uses a monolithic SON package with ultra-low inductance layout, optimized PCB footprint, and thermal vias to PGND planes. The device requires external 0.1-µF bootstrap capacitor between BOOT and BOOT_R, and supports VIN up to 16 V with VDD regulated at 4.5–5.5 V for gate drive.

Key Specifications

Pinout & Package

Package: SON (Small Outline No-lead), 3.3 mm × 3.3 mm, 10-pin, exposed thermal pad (PGND-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck power stage applications.

Compared with CSD95372Q5M and ISL99227B, the CSD95379Q3M offers the lowest quiescent current (8 µA), smallest footprint (3.3 mm²), and highest light-load efficiency via diode emulation-making it optimal for portable computing where size, battery life, and thermal envelope are critical.

Availability

CSD95379Q3M is available at Aetrix Electronics and suitable for high-density notebook VRMs, ultrabook CPU power delivery, and networking ASIC core supplies requiring stable component supply across multi-year production cycles.

Supply support for CSD95379Q3M 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 company designing analog, embedded processing, and power management ICs for industrial, automotive, and computing markets.

The CSD95379Q3M belongs to TI's NexFET™ power stage product line, engineered specifically for high-efficiency, high-frequency synchronous buck conversion in space-constrained mobile and infrastructure applications.

FAQ

What is the maximum input voltage rating for the CSD95379Q3M?

The CSD95379Q3M has an absolute maximum VIN-to-PGND rating of 20 V, with a recommended operating limit of 16 V per the datasheet. Exceeding 16 V may cause excessive AC overshoot on the VSW node during switching transients, risking reliability. The CSD95379Q3M must be used with proper input capacitance and layout to manage dV/dt stress, especially given its >10 kV/µs capability.

Does the CSD95379Q3M require an external bootstrap diode?

No, the CSD95379Q3M integrates a bootstrap diode internally between VDD and BOOT pins. Only a 0.1-µF ceramic capacitor between BOOT and BOOT_R is required to complete the bootstrap circuit. This eliminates one external component, reduces layout area, and improves reliability versus discrete bootstrap solutions - a key feature confirmed in the CSD95379Q3M functional block diagram and Pin Functions table.

How does the CSD95379Q3M support Windows Connected Standby?

The CSD95379Q3M supports Windows Connected Standby through its Ultra-Low Quiescent (ULQ) mode: when SKIP# is left floating (tri-state), supply current drops to 8 µA (typical), with ~20 µs wake-up time. This meets ECMA-395 S0ix requirements. The CSD95379Q3M achieves this via internal UVLO disable and gate driver shutdown - explicitly documented in Section 7.2.4 and Table 1 of the CSD95379Q3M datasheet.

What thermal resistance values apply to the CSD95379Q3M package?

The CSD95379Q3M has RθJC(top) = 22.8°C/W (junction-to-case, top surface) and RθJB = 2.5°C/W (junction-to-board). These values assume mounting on a 1-in² 2-oz Cu pad per JEDEC JESD51-2. The low RθJB confirms the SON package's reliance on PCB copper for heat dissipation - validated by thermal imaging in the CSD95379Q3M SOA curves and Layout Guidelines section.

Can the CSD95379Q3M operate with a 3.3-V PWM signal?

Yes, the CSD95379Q3M PWM input is compatible with both 3.3-V and 5-V logic levels. Its VIH threshold is 2.65 V (min), VIL is 0.6 V (max), and tri-state window spans 1.3–2.0 V - ensuring reliable recognition of standard 3.3-V CMOS signals. This dual-voltage compatibility is specified in Section 6.5 Electrical Characteristics and enables direct interfacing with common PMICs and controllers without level shifting - a confirmed feature in the CSD95379Q3M Features list.