Texas Instruments CSD17522Q5A

Overview

CSD17522Q5A from Texas Instruments is a 30V, N-channel NexFET™ power MOSFET optimized for 5V gate drive in high-efficiency synchronous buck converters. It delivers 6.7 mΩ R_DS(on) at V_GS = 10V, 10 mΩ at V_GS = 4.5V, and features ultralow gate charge (Q_g = 3.6 nC) for fast switching in notebook point-of-load and telecom POL applications.

For engineers reviewing the CSD17522Q5A datasheet, CSD17522Q5A pinout, CSD17522Q5A application, or CSD17522Q5A equivalent, key selection criteria include its 5V-drive compatibility, 1.8°C/W junction-to-case thermal resistance, avalanche rating (E_AS = 54 mJ), SON 5-mm × 6-mm package with exposed drain pad, and low Q_gd/Q_g ratio for reduced switching loss.

Technical Context

This device uses a trench-gate silicon process to achieve low R_DS(on) and minimized gate charge, enabling high-frequency operation in DC/DC converters. Its threshold voltage (V_GS(th) = 1.1–2.0 V) and transconductance (g_fs = 37 S) support stable turn-on with standard logic-level drivers.

The MOSFET integrates an intrinsic body diode with V_SD = 0.85–1.0 V at I_SD = 14 A and Q_rr = 19.6 nC, supporting synchronous rectification while limiting reverse recovery losses. Thermal design is aided by R_θJC = 1.8°C/W and R_θJA = 51°C/W on a 1-in² 2-oz Cu PCB.

Key Specifications

Pinout & Package

Package: SON 5-mm × 6-mm plastic package (VSONP/DQJ), 8-pin, exposed drain pad (DRAIN pins 1–3, 5–8). Designed for low-inductance layout and high thermal transfer via bottom-side thermal pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel MOSFET applications.

Compared with IRF7470PBF and DMN3025LSD-13, the CSD17522Q5A offers superior thermal performance (R_θJC = 1.8°C/W vs. ≥3.5°C/W), lower gate charge, and tighter R_DS(on) tolerance-making it optimal for high-density, high-efficiency 5V-driven synchronous buck converters above 10 A.

Availability

CSD17522Q5A is available at Aetrix Electronics and suitable for notebook point-of-load, networking telecom POL, and industrial FPGA power supply designs requiring stable component supply, long-term manufacturability, and qualified automotive-grade alternatives.

Supply support for CSD17522Q5A 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 expertise in high-reliability power conversion solutions.

The NexFET™ power MOSFET product line targets high-frequency, high-efficiency DC/DC conversion-specifically engineered to reduce conduction and switching losses in synchronous buck regulators for computing, telecom, and industrial applications.

FAQ

What is the maximum continuous drain current for CSD17522Q5A at 25°C case temperature?

The CSD17522Q5A supports 87 A continuous drain current at T_C = 25°C, as specified in the Absolute Maximum Ratings table. This rating assumes ideal thermal management via the exposed drain pad and sufficient copper area. At T_A = 25°C with standard PCB layout, the limit drops to 16 A due to higher junction-to-ambient thermal resistance (R_θJA = 51°C/W).

Does CSD17522Q5A support 3.3V gate drive?

The CSD17522Q5A is not characterized for reliable operation at 3.3V gate drive. Its R_DS(on) is guaranteed only down to V_GS = 4.5V (10–12.4 mΩ), and threshold voltage spans 1.1–2.0 V. At 3.3V, the device may operate in linear mode with excessive conduction loss and thermal runaway risk-TI recommends minimum 4.5V drive for full enhancement.

What is the recommended PCB layout for thermal performance of CSD17522Q5A?

For optimal thermal performance, the CSD17522Q5A requires a minimum 1-inch² (6.45 cm²) 2-oz copper pad connected to the exposed drain pad via ≥6 thermal vias (0.3 mm diameter, filled or plated). TI's SLPA005 application note specifies the exact pattern: F1–F11 dimensions in Figure 14, with solder mask defined to maximize thermal pad exposure and minimize voiding.

Is CSD17522Q5A suitable for use as a high-side switch in a floating gate configuration?

Yes-the CSD17522Q5A supports high-side switching when paired with a bootstrap or isolated gate driver. Its ±20 V V_GS rating and low Q_gd (1.1 nC) minimize Miller-induced turn-on risk. However, gate drive must maintain V_GS ≥4.5V during conduction; bootstrap capacitor sizing must account for Q_g = 3.6 nC per cycle and duty-cycle-dependent refresh requirements.

What is the avalanche energy rating of CSD17522Q5A and under what test conditions is it measured?

The CSD17522Q5A has a single-pulse avalanche energy rating of 54 mJ, measured under standardized unclamped inductive switching (UIS) conditions: I_D = 33 A, L = 0.1 mH, R_G = 25 Ω, and T_J initial = 25°C. This rating confirms ruggedness against inductive transients in synchronous buck and motor drive applications where freewheeling diode recovery stresses the switch.