Texas Instruments CSD97394Q4MT

Overview

CSD97394Q4MT 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 20 A continuous output current at 90% system efficiency (15 A, 1.8 V out), supports up to 2 MHz switching, and operates with 3.3 V/5 V PWM inputs in a 3.5 × 4.5 mm SON package - deployed in multiphase Vcore and DDR solutions for Ultrabook/Notebook DC/DC converters.

For engineers reviewing the CSD97394Q4MT datasheet, CSD97394Q4MT pinout, CSD97394Q4MT application, or CSD97394Q4MT equivalent, key selection criteria include its tri-state PWM/SKIP# control logic, ULQ/ULQ modes (8 µA standby), integrated bootstrap diode, shoot-through protection, and validated 45 A peak current capability under thermal-limited conditions.

Technical Context

The CSD97394Q4MT implements a gate-driver-integrated synchronous buck topology with adaptive zero-crossing detection for diode emulation mode (DCM) when SKIP# is low, and forced continuous conduction mode (FCCM) when SKIP# is high. Its driver supports tri-state input logic on both PWM and SKIP# pins, enabling ultra-low quiescent current states (130 µA LQ, 8 µA ULQ) without latency penalties.

It features an integrated bootstrap FET (replacing discrete diode), programmable UVLO thresholds (4.15 V rise, 3.7 V fall), and robust thermal design with R_θJB = 2.5 °C/W. The device is optimized for 12 V input, 1.8 V output systems with 0.29 µH inductors and 500 kHz–2 MHz switching, delivering measured power loss of 2.2 W at 12 A (12 V_IN, 1.8 V_OUT, 25°C).

Key Specifications

Pinout & Package

Package: SON 3.5 × 4.5 mm plastic package with exposed thermal pad (PGND-connected). Optimized for high-density PCB layout with minimal loop inductance and thermal vias to internal ground planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP87651GQ-Z and ISL99227BIRZ, the CSD97394Q4MT provides superior light-load efficiency via hardware-based ULQ/DCM modes and lower layout risk due to integrated bootstrap FET and SON package symmetry - making it optimal for space-constrained, high-efficiency notebook and telecom PoL designs.

Availability

CSD97394Q4MT is available at Aetrix Electronics and suitable for Ultrabook CPU core power, DDR memory regulation, and networking point-of-load conversion requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for CSD97394Q4MT 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 specializing in analog, embedded processing, and power management technologies, with over 50 years of leadership in high-reliability power conversion solutions.

The CSD97394Q4MT belongs to TI's NexFET™ Power Stage product line, engineered specifically for high-current, high-frequency synchronous buck applications in computing, networking, and telecom infrastructure where density, efficiency, and thermal performance are critical.

FAQ

What is the maximum recommended junction temperature for continuous operation of the CSD97394Q4MT?

The CSD97394Q4MT has a maximum operating junction temperature of 150°C, with thermal derating required above 125°C ambient or board temperature depending on airflow. Its R_θJB = 2.5 °C/W enables 20 A continuous operation at 60°C board temperature with 200 LFM airflow, as validated in TI's SLPS542 datasheet Figure D004.

Does the CSD97394Q4MT require an external bootstrap diode?

No, the CSD97394Q4MT integrates a bootstrap FET instead of a diode, eliminating external component needs and reducing forward voltage drop. A 0.1 µF ceramic capacitor must still be placed between BOOT and BOOT_R pins per the datasheet recommendation in Section 7.3.1.

How does the CSD97394Q4MT achieve 8 µA standby current?

The CSD97394Q4MT achieves 8 µA standby current (ULQ mode) when SKIP# is held in tri-state, disabling the UVLO comparator and most internal circuitry while retaining immediate wake-up capability. This mode is explicitly validated in Section 6.5 Electrical Characteristics and Figure 2 timing diagram of SLPS542.

Can the CSD97394Q4MT operate with a 3.3 V PWM input signal?

Yes, the CSD97394Q4MT supports 3.3 V PWM signals: its VIH threshold is 2.65 V and VIL is 0.6 V, with 0.2 V hysteresis, ensuring compatibility with both 3.3 V and 5 V logic families as stated in Section 6.5 PWM and SKIP# I/O Specifications.

What is the purpose of the dual PGND pins (pins 3 and 9) on the CSD97394Q4MT?

The dual PGND pins (3 and 9) provide low-inductance, parallel return paths for high-frequency switching currents from both high-side and low-side FETs. They must be connected to the same solid copper ground plane with multiple thermal vias to minimize voltage bounce and ensure stable gate drive referencing, as emphasized in Layout Section 9.1.2.