Texas Instruments CSD97394Q4M

Overview

CSD97394Q4M from Texas Instruments is a synchronous buck NexFET™ power stage integrating driver IC and dual MOSFETs for high-density DC/DC conversion. It delivers 20 A continuous / 45 A peak output, operates up to 2 MHz, achieves 90% system efficiency at 15 A, and targets point-of-load regulation in computing and networking systems.

For engineers reviewing the CSD97394Q4M datasheet, CSD97394Q4M pinout, CSD97394Q4M application, or CSD97394Q4M equivalent, key selection criteria include its 3.5 × 4.5 mm SON package, tri-state PWM/ SKIP# inputs enabling ultra-low quiescent current (8 µA ULQ mode), integrated bootstrap diode, and diode emulation for light-load efficiency in Vcore and DDR supplies.

Technical Context

The CSD97394Q4M implements a current-mode synchronous buck topology with integrated gate driver, control FET, and sync FET. Its driver supports forced continuous conduction mode (FCCM) and diode emulation mode via SKIP# pin control, with adaptive zero-crossing detection for discontinuous conduction mode (DCM) transition.

It features ultralow-inductance packaging optimized for >10 kV/µs dV/dt switching, integrated bootstrap switch replacing external diode, and UVLO with 4.15 V turn-on / 3.7 V shutdown thresholds. The device requires external 0.1 µF ceramic bootstrap capacitor between BOOT and BOOT_R pins.

Key Specifications

Pinout & Package

Package: SON 3.5 × 4.5 mm plastic package with exposed thermal pad; optimized for low parasitic inductance and high thermal conductivity to PCB ground planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CSD97374Q5M and TPS53679, the CSD97394Q4M provides optimal balance of current rating, efficiency, and board space for mid-range computing point-of-load applications-offering higher peak current than the TPS53679's integrated solution and lower conduction loss than the CSD97374Q5M at typical 15 A loads.

Availability

CSD97394Q4M is available at Aetrix Electronics and suitable for Ultrabook CPU core power, multiphase Vcore supplies, and DDR memory point-of-load regulation requiring stable component supply and long-term production continuity.

Supply support for CSD97394Q4M 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 and embedded processing chips for industrial, automotive, and computing applications.

The CSD97394Q4M belongs to TI's NexFET™ power stage product line, engineered specifically for high-efficiency, high-frequency synchronous buck converters in space-constrained computing and networking equipment.

FAQ

What is the maximum input voltage rating for the CSD97394Q4M?

The CSD97394Q4M has an absolute maximum VIN-to-PGND rating of 30 V, with recommended operating input voltage up to 24 V. Operation above 24 V increases risk of VSW node overshoot exceeding the 33 V transient rating, potentially causing reliability issues. For reliable 24 V operation, ensure proper input capacitance placement and layout per Section 9.1.2 of the SLPS542 datasheet.

How does the CSD97394Q4M achieve 90% system efficiency at 15 A?

The CSD97394Q4M achieves 90% system efficiency at 15 A through co-optimized NexFET silicon (1.2 mΩ control FET, 1.6 mΩ sync FET), ultra-low-inductance 3.5 × 4.5 mm SON packaging, integrated gate driver minimizing dead-time loss, and diode emulation mode reducing light-load conduction loss. Measured at VIN = 12 V, VOUT = 1.8 V, fSW = 500 kHz, and TA = 25°C with six 10 µF ceramic input capacitors.

What is the purpose of the SKIP# pin on the CSD97394Q4M?

The SKIP# pin on the CSD97394Q4M controls diode emulation mode and ultra-low quiescent current states. When pulled low, it enables discontinuous conduction mode (DCM) via adaptive zero-crossing detection to improve light-load efficiency. When tri-stated, it activates ULQ mode with 8 µA supply current, enabling connected standby for Windows® 8 platforms. Its function is independent of PWM state and defined in Table 1 of the SLPS542 datasheet.

Can the CSD97394Q4M operate at 2 MHz switching frequency?

Yes, the CSD97394Q4M supports switching frequencies up to 2000 kHz, as specified in Section 6.3 Recommended Operating Conditions. Stable 2 MHz operation requires careful PCB layout-including minimized VSW loop area, tight input capacitor placement, and proper bootstrap capacitor (0.1 µF X5R ceramic) routing-to manage >10 kV/µs dV/dt transients and maintain gate drive integrity.

What thermal management features does the CSD97394Q4M include?

The CSD97394Q4M uses its exposed thermal pad as the primary heat path to the PCB, with a junction-to-board thermal resistance (RθJB) of 2.5°C/W. Effective thermal management requires ≥8 thermal vias (10 mil drill, 16 mil pad) connecting the pad to inner ground planes, plus copper pour on top/bottom layers. Layout guidelines in Section 9.3 specify via spacing, tenting, and solder-void mitigation techniques to maximize heat transfer.