Texas Instruments LM536035QPWPTQ1

Overview

LM536035QPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3 A at 5 V or 3.3 V from a 3.5–36 V input, featuring 2.1 MHz fixed switching frequency, ±2% output voltage tolerance, and integrated reset with 2–4 ms assertion delay. It targets power rails in instrument clusters and ADAS domain controllers where high transient immunity (42 V surge) and low-noise operation are critical.

For engineers reviewing the LM536035QPWPTQ1 datasheet, LM536035QPWPTQ1 pinout, LM536035QPWPTQ1 application, or LM536035QPWPTQ1 equivalent, key selection criteria include its 3 A load capability, HTSSOP-16 thermal performance (R_θJA = 42.5°C/W), forced PWM mode control via FPWM pin, and automotive-grade ESD robustness (HBM ±2500 V on EN/RESET/FB).

Technical Context

The LM536035QPWPTQ1 employs current-mode control with valley-current limiting for overload and short-circuit protection, plus high-side peak current limit (4.5–6.2 A) and negative-current limit (–1.5 A in FPWM mode). Its oscillator supports external synchronization (1.9–2.3 MHz) and automatically reduces switching frequency above ~20 V input to maintain regulation.

It integrates internal loop compensation, soft-start (1–3 ms), thermal shutdown (162–178°C), UVLO (3.2–3.95 V start), and a precision open-drain RESET output with 12–45 µs glitch filtering and 94.5–96.5% falling threshold tracking actual V_OUT.

Key Specifications

Pinout & Package

Package: HTSSOP-16 (5.00 mm × 4.40 mm × 1.00 mm) with exposed thermal pad (EP). Thermally enhanced for automotive under-hood operation; requires PCB copper pour connected to EP and AGND/PGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM53602QPWPTQ1, the LM536035QPWPTQ1 provides higher current headroom and stronger overload protection, while MPQ4333GQ-AEC1 trades integrated features for flexibility in output voltage programming - making LM536035QPWPTQ1 optimal for space-constrained, RESET-dependent ADAS power rails.

Availability

LM536035QPWPTQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera ECUs, and HUD projection units requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for LM536035QPWPTQ1 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 automotive-grade power management ICs, with decades of automotive qualification expertise.

The LM5360x-Q1 product line was designed specifically for automotive power conversion - emphasizing wide-input operation, AEC-Q100 reliability, integrated diagnostics (RESET), and thermal robustness for under-hood and cockpit applications.

FAQ

What is the minimum input voltage required for the LM536035QPWPTQ1 to start regulation?

The LM536035QPWPTQ1 starts regulation when input voltage rises to 3.95 V (typical) with hysteresis of 0.34 V. Below 3.55 V (falling), it shuts down completely. This 3.5 V minimum enables reliable operation during cold-crank conditions in 12 V automotive systems, where battery voltage can dip below 6 V.

Does the LM536035QPWPTQ1 require external feedback resistors for 5 V output?

No, the LM536035QPWPTQ1 does not require external feedback resistors for 5 V output - it is a fixed-output variant with internal resistor divider. The FB pin connects directly to the 5 V output node. External resistors are only needed for the adjustable (ADJ) version, which is not applicable to LM536035QPWPTQ1.

How is the RESET output of the LM536035QPWPTQ1 configured and used?

The RESET output of the LM536035QPWPTQ1 is an open-drain NMOS requiring an external pull-up resistor to a logic supply (e.g., V_OUT or V_CC). It asserts high when output voltage reaches ≥105% of nominal and remains high after a 2–4 ms delay; it goes low for faults or when EN is deasserted. This provides a precise, filtered power-good signal without external components.

Can the LM536035QPWPTQ1 synchronize to an external clock, and what is the supported frequency range?

Yes, the LM536035QPWPTQ1 supports external synchronization via the SYNC pin, accepting a square-wave clock between 1.9 MHz and 2.3 MHz. This allows EMI reduction through frequency dithering or alignment with system clocks in multi-rail automotive domains - essential for meeting CISPR-25 Class 5 requirements.

What thermal management considerations apply to the LM536035QPWPTQ1 in a 3 A application?

For 3 A operation, the LM536035QPWPTQ1 requires the exposed thermal pad (EP) to be soldered to a minimum 200 mm² internal or external GND copper plane. With proper layout, it sustains full load at +85°C ambient (R_θJA = 42.5°C/W). Thermal shutdown activates at 162–178°C junction temperature, providing fail-safe protection during overload or poor airflow conditions.