Texas Instruments LM536035QPWPRQ1

Overview

LM536035QPWPRQ1 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 3.5 V–36 V input, featuring 2.1 MHz fixed switching frequency, ±2% output voltage tolerance, and integrated reset with 2–4 ms assertion delay. It serves as primary power supply in instrument clusters and ADAS domain controllers.

For engineers reviewing the LM536035QPWPRQ1 datasheet, LM536035QPWPRQ1 pinout, LM536035QPWPRQ1 application, or LM536035QPWPRQ1 equivalent, key selection criteria include its 3 A load capability, 1.7 µA shutdown current, FPWM mode control, automotive-grade thermal range (–40°C to +150°C junction), and HTSSOP-16 package with exposed paddle for thermal management.

Technical Context

The LM536035QPWPRQ1 employs current-mode control with valley-current limiting and automatic PWM/PFM transition. Its oscillator supports external synchronization (SYNC pin) and reduces frequency under high VIN (>20 V) to maintain regulation.

It integrates internal loop compensation, soft-start (2 ms typical), thermal shutdown (162–178°C), UVLO, and a dedicated BIAS pin for improved light-load efficiency. The RESET output provides open-drain fault indication with 12–45 µs glitch filtering and 2–4 ms activation delay referenced to actual VOUT.

Key Specifications

Pinout & Package

LM536035QPWPRQ1 uses a thermally enhanced HTSSOP-16 package (5.00 mm × 4.40 mm × 1.00 mm) with exposed die attach paddle (EP) for PCB-level heat sinking and noise reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM53602QPWPRQ1, LM536035QPWPRQ1 delivers 50% higher current headroom and tighter RESET threshold tracking; versus TPS54360BQDDAQ1, it trades input voltage headroom for integrated fault signaling and smaller solution size.

Availability

LM536035QPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, and HUD projection controllers requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LM536035QPWPRQ1 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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and wireless chips for industrial, automotive, and consumer markets.

The LM5360x-Q1 product line was developed specifically for automotive power conversion, emphasizing AEC-Q100 compliance, transient robustness, integrated diagnostics, and thermal performance in space-constrained ECUs.

FAQ

What is the maximum output current supported by the LM536035QPWPRQ1?

The LM536035QPWPRQ1 supports a maximum continuous output current of 3 A under recommended operating conditions (–40°C to +125°C ambient, proper PCB thermal design). This rating assumes use of the HTSSOP-16 package with exposed paddle soldered to a thermal plane and input voltage between 3.5 V and 36 V. Peak current limit is 4.5–6.2 A (high-side) and 3–4.3 A (low-side valley), verified per Electrical Characteristics table.

Does the LM536035QPWPRQ1 require external feedback resistors for 5 V output?

No, the LM536035QPWPRQ1 does not require external feedback resistors for 5 V output. It integrates an internal resistor divider optimized for 5 V regulation, connecting directly to the FB pin. This eliminates layout sensitivity, improves accuracy (±2% total output tolerance), and reduces bill-of-materials count. External resistors are only needed for the ADJ variant, not for LM536035QPWPRQ1.

How does the RESET function operate on the LM536035QPWPRQ1?

The RESET function on LM536035QPWPRQ1 is an open-drain output that asserts low during output undervoltage or fault conditions. It features 12–45 µs glitch filtering and a 2–4 ms delay before asserting high after VOUT reaches regulation. Thresholds track actual VOUT (e.g., 94.5–96.5% falling, 105–110% rising), enabling tighter system margins than fixed-threshold supervisors. RESET remains valid down to VIN ≥1.5 V even when EN is low.

Can the LM536035QPWPRQ1 be synchronized to an external clock?

Yes, the LM536035QPWPRQ1 supports external frequency synchronization via the SYNC pin. It accepts a TTL/CMOS clock signal in the 1.9–2.3 MHz range, allowing alignment with system clocks to reduce beat frequencies and simplify EMI filtering. When not used, SYNC must be tied to GND - floating the pin may cause erratic operation or increased EMI. The internal oscillator defaults to 2.1 MHz when SYNC is grounded.

What thermal considerations apply to the LM536035QPWPRQ1 in automotive environments?

The LM536035QPWPRQ1 operates from –40°C to +150°C junction temperature and is qualified to AEC-Q100 Grade 1 (–40°C to +125°C ambient). Its HTSSOP-16 package features an exposed paddle (EP) requiring direct solder connection to a thermal plane. With proper 4-layer PCB layout, it achieves RθJA = 42.5°C/W and RθJC(bot) = 1.1°C/W. Derating is required above 125°C junction - lifetime degrades exponentially beyond this point per TI's thermal guidelines.