Texas Instruments LM53602AQPWPRQ1

Overview

LM53602AQPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 2 A at 3.3 V or 5 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 efficiency, transient robustness, and functional safety support are required.

For engineers reviewing the LM53602AQPWPRQ1 datasheet, LM53602AQPWPRQ1 pinout, LM53602AQPWPRQ1 application, or LM53602AQPWPRQ1 equivalent, key selection criteria include its 2 A current rating, 3.5 V minimum start-up voltage for 3.3 V output, 1.7 µA shutdown current, FPWM mode control, and HTSSOP-16 thermal performance (R_θJA = 42.5°C/W).

Technical Context

The LM53602AQPWPRQ1 implements current-mode control with valley-current limiting and automatic PWM/PFM transition, enabling high light-load efficiency (24 µA no-load supply current) while maintaining tight regulation across line and load transients. Its oscillator supports external synchronization (1.9–2.3 MHz range) and reduces frequency under high VIN (>20 V) to sustain regulation.

It integrates internal loop compensation, soft-start (1–3 ms), thermal shutdown (162–178°C), UVLO (3.2–3.95 V rising), and an open-drain RESET output with glitch filtering (12–45 µs) and tracking thresholds (94.5–96.5% of V_OUT falling, 105–110% rising), eliminating need for external supervisors.

Key Specifications

Pinout & Package

LM53602AQPWPRQ1 uses a thermally enhanced 16-pin HTSSOP package (5.00 mm × 4.40 mm × 1.00 mm) with exposed die paddle (EP) for PCB-level heat sinking and noise reduction. Pin 14 is no-connect (N/C); pins 1/2 (SW), 12/13 (VIN), and 15/16 (PGND) are internally paralleled and must be shorted on PCB for optimal current sharing and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM53603AQPWPRQ1, LM53602AQPWPRQ1 offers lower thermal stress and reduced component stress at ≤2 A loads; versus TPS54360BQDDAQ1, it trades input range and adjustability for superior integration, smaller solution size, and lower system-level BOM count.

Availability

LM53602AQPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, HUD projection units, and telematics control units requiring stable component supply with AEC-Q100 qualification and long-term production continuity.

Supply support for LM53602AQPWPRQ1 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 solutions, with over 40 years of automotive qualification experience.

The LM5360x-Q1 product line was designed specifically for automotive power conversion, emphasizing AEC-Q100 Grade 1 reliability, wide-input transient tolerance, integrated functional safety features, and thermally robust packaging for under-hood deployment.

FAQ

What is the minimum input voltage required for LM53602AQPWPRQ1 to regulate a 3.3 V output?

The LM53602AQPWPRQ1 can regulate a 3.3 V output down to a minimum input voltage of 3.55 V at 1 A load and 3.9 V at 3 A load, as specified in the System Characteristics table. This 3.5 V start-up capability enables reliable operation during automotive cold-crank conditions without brownout.

Does LM53602AQPWPRQ1 require external feedback resistors for fixed 5 V or 3.3 V output?

No, LM53602AQPWPRQ1 does not require external feedback resistors. It integrates precision internal dividers for both 5 V and 3.3 V fixed outputs - the FB pin is internally connected and must remain unconnected in those configurations, simplifying design and improving accuracy.

How does the RESET function of LM53602AQPWPRQ1 differ from a standard power-good signal?

The LM53602AQPWPRQ1 RESET output uses the same internal reference as the regulation loop, providing tracking thresholds (e.g., 94.5–96.5% falling, 105–110% rising) that scale with actual VOUT. This eliminates calibration drift and enables tighter tolerance than discrete supervisors - verified across –40°C to +125°C.

Can LM53602AQPWPRQ1 synchronize to an external clock, and what is the supported frequency range?

Yes, LM53602AQPWPRQ1 supports external synchronization via the SYNC pin across 1.9–2.3 MHz. This allows noise spectral alignment with system clocks to avoid interference in sensitive domains like radar or camera imaging - essential for CISPR 25 compliance.

What thermal performance can be expected from LM53602AQPWPRQ1 in a standard 4-layer JEDEC board layout?

On a standard 4-layer JEDEC board, LM53602AQPWPRQ1 achieves R_θJA = 42.5°C/W and R_θJC(bot) = 1.1°C/W. With proper thermal vias under the EP pad, it delivers full 2 A output at +125°C ambient - validated per JESD 51-7 and documented in the Thermal Information section.