Infineon Technologies TDA21535AUMA1

Overview

TDA21535AUMA1 from Infineon is an integrated power-stage IC combining a synchronous buck gate driver, high-side and low-side MOSFETs, and active diode structure for DDR memory and low-current voltage rails. It delivers 35 A output current, supports 4.25–16 V input, regulates down to 0.225 V, operates up to 1.5 MHz, and features on-chip current sensing with 5 µA/A gain and thermal monitoring via TMON pin.

For engineers reviewing the TDA21535AUMA1 datasheet, TDA21535AUMA1 pinout, TDA21535AUMA1 application in DDR memory regulation, or TDA21535AUMA1 equivalent for high-efficiency point-of-load conversion, this page provides verified electrical parameters, validated pin functions, real-world protection behavior (OCP, OTP, HSS), and layout-critical signal roles (SW, BOOT, PHASE, IMON).

Technical Context

The TDA21535AUMA1 implements a fully integrated synchronous buck power stage with internal MOSFET current sensing-replacing external DCR-based sensing-and active diode architecture that minimizes reverse recovery charge while achieving Schottky-like V_SD. Its bootstrap capacitor auto-replenishment circuit ensures reliable high-side gate drive across duty cycles.

It accepts tri-state 3.3 V PWM input for precise control of high-side turn-on, low-side turn-on, and full-shutdown states, and integrates EN-controlled ultra-low-power DEEP SLEEP mode (32 µA) and auto SLEEP mode (1.7 mA) after 20 µs of PWM tri-state, enabling dynamic power management in memory subsystems.

Key Specifications

Pinout & Package

Package: PQFN 4 mm × 5 mm × 0.9 mm, RoHS-compliant, with exposed thermal pad (pin 15) for direct PCB heat sinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated power-stage applications.

Compared with MP87651GQ-Z and ISL99390IRZ, the TDA21535AUMA1 uniquely combines 35 A capability with 1.5 MHz operation, analog TMON/FLT signaling, and bootstrap auto-replenishment-making it optimal for thermally constrained, high-transient DDR and ASIC core rail designs requiring precision current and temperature visibility.

Availability

TDA21535AUMA1 is available at Aetrix Electronics and suitable for DDR memory regulation, ASIC/FPGA core rail supply, and network PHY power applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.

Supply support for TDA21535AUMA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and security solutions, with leadership in silicon carbide and advanced power stages.

The TDA21535 belongs to Infineon's OptiMOS™ Power Stage product line, engineered specifically for high-efficiency, high-density point-of-load conversion in memory and processor subsystems where thermal performance, current accuracy, and fast transient response are critical.

FAQ

What is the recommended bootstrap capacitor value and dielectric type for TDA21535AUMA1?

The datasheet specifies a 0.22 µF to 0.56 µF X7R ceramic capacitor between BOOT and PHASE pins. X7R is required for stable capacitance across temperature and DC bias; NP0/C0G is not recommended due to lower volumetric efficiency and higher cost at these values. Mounting must minimize loop inductance using short, wide traces and direct vias to PGND.

How does the TDA21535AUMA1 implement cycle-by-cycle overcurrent protection?

OCP triggers within one switching cycle when sensed current exceeds the threshold derived from IMONREF voltage and internal gain. The FLT pin asserts high, and gate drive is immediately disabled. Recovery requires either PWM reset or EN toggle. This differs from average-current limiting-it protects against short-circuit faults before MOSFET thermal runaway occurs.

Can the IMON output be used for closed-loop current limiting in the controller?

Yes-IMON delivers a 5 µA/A proportional current referenced to IMONREF. When a resistor (e.g., 1 kΩ) connects IMON to IMONREF, the resulting voltage (5 mV/A) can feed a controller's current-limit comparator. This enables precise, temperature-stable per-phase current limiting without DCR calibration or external sense resistors.

Is the TDA21535AUMA1 pin-compatible with earlier TDA214xx series devices?

No-TDA21535AUMA1 uses a 28-pin PQFN package with different pin assignments (e.g., dedicated TMON/FLT on pin 1, dual SW pins 8–12, PHASE on pin 19). Pin count, thermal pad layout, and signal mapping differ significantly from TDA21472/TDA21490, requiring new PCB design and layout validation.