Texas Instruments LM53600NQDSXTQ1

Overview

LM53600NQDSXTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck DC/DC converter delivering a fixed 3.3-V output at up to 650 mA, operating from 3.55 V to 36 V input with transient tolerance to 42 V, featuring 2.1-MHz fixed switching frequency, spread spectrum modulation, and integrated RESET with delay filtering - deployed in automotive camera power rails.

For engineers reviewing the LM53600NQDSXTQ1 datasheet, LM53600NQDSXTQ1 pinout, LM53600NQDSXTQ1 application, or LM53600NQDSXTQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD ratings, and real-world selection guidance for camera and ADAS subsystems requiring high-reliability 3.3-V regulation under cold-crank and load-dump conditions.

Technical Context

The LM53600NQDSXTQ1 implements peak current mode control with internal compensation, enabling stable 2.1-MHz operation across 3.55–36 V input while regulating 3.3 V from as low as 3.8 V - critical for start-stop systems. Its spread spectrum option reduces EMI peaks by ±4% frequency dithering at 30 Hz, and the SYNC/MODE pin supports external clock synchronization or auto PWM/PFM mode selection.

It integrates a 3-V internal regulator (VCC), open-drain RESET with 4–8 ms delay and 92–110% output voltage hysteresis, and dual current limiting (HS: 1.0–1.65 A, LS: 0.65–0.93 A) with zero-cross detection. Thermal shutdown activates at 151–185°C with 10°C hysteresis, and junction temperature is rated from –40°C to 150°C.

Key Specifications

Pinout & Package

LM53600NQDSXTQ1 uses a 10-pin WSON (DSX) package, 3.0 mm × 3.0 mm, with wettable flanks and exposed thermal pad (DAP) connected to GND for enhanced heat dissipation. The DAP is electrically isolated and serves thermal conduction only.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive buck regulator applications.

Compared with LM53601NQDSXTQ1, the LM53600NQDSXTQ1 trades 350-mA current headroom for tighter thermal design margin and identical integration; versus TPS62810-Q1, it retains RESET and spread spectrum at the cost of 8-µA higher IQ and 350-mA lower current rating - making it optimal for space-constrained, EMI-sensitive 650-mA camera rails.

Availability

LM53600NQDSXTQ1 is available at Aetrix Electronics and suitable for automotive camera power supplies, ADAS domain controllers, and body electronics requiring stable component supply with AEC-Q100 qualification, extended temperature operation, and long-term production continuity.

Supply support for LM53600NQDSXTQ1 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 and embedded processing technologies, with deep expertise in automotive power management and functional safety design.

The LM53600-Q1 product line delivers compact, high-frequency synchronous buck regulators optimized for automotive camera, ADAS, and body electronics - emphasizing low EMI, wide input range, and integrated supervision to reduce system-level BOM count and layout complexity.

FAQ

What is the maximum junction temperature specification for LM53600NQDSXTQ1?

The LM53600NQDSXTQ1 is specified for operation up to 150°C junction temperature, with thermal shutdown activation between 151°C and 185°C and 10°C hysteresis. This rating supports deployment in under-hood and rear-trunk camera modules where ambient temperatures reach 105°C and board-level heating adds significant delta-T. The device maintains full electrical performance across its entire –40°C to 150°C junction range, as validated per AEC-Q100 Grade 1 requirements.

Does LM53600NQDSXTQ1 support external clock synchronization?

Yes, LM53600NQDSXTQ1 supports external clock synchronization via the SYNC/MODE pin. When a valid AC-coupled clock signal (1.9–2.3 MHz, 25–75% duty cycle) is applied, the device synchronizes its switching to the external source's rising edge and operates in forced PWM mode. Spread spectrum is automatically disabled during synchronization. This capability allows timing alignment with other power rails or high-speed interfaces like MIPI D-PHY to avoid beat-frequency interference.

What is the purpose of the DAP (exposed pad) on LM53600NQDSXTQ1?

The DAP on LM53600NQDSXTQ1 is an exposed thermal pad designed solely for heat dissipation - it must be soldered to a dedicated GND plane using multiple thermal vias. It is not an electrical terminal; no electrical connections should be made to it. Proper DAP grounding reduces junction-to-board thermal resistance to 20.9°C/W, enabling reliable 650-mA operation at 125°C ambient. Failure to connect the DAP compromises thermal performance and risks premature thermal shutdown.

How does the RESET function behave during startup and fault conditions for LM53600NQDSXTQ1?

The LM53600NQDSXTQ1 RESET output remains low until the output reaches 105–110% of nominal 3.3 V, then releases after a 4–8 ms delay. It asserts low again if output falls below 92–97% VOUT or if EN is pulled low. During undervoltage lockout (VIN < 3.2 V), RESET stays low. This behavior provides a true power-good signal for host microcontrollers, eliminating need for external RC timing circuits or supervisor ICs in camera modules.

Can LM53600NQDSXTQ1 operate with input voltage below 3.8 V?

Yes, LM53600NQDSXTQ1 can regulate 3.3 V from as low as 3.55 V after startup, though minimum input for full functionality at 500-mA load is 3.55 V and for 100% rated load (650 mA) is 3.8 V. Below 3.8 V, duty cycle increases toward maximum (76%), reducing efficiency and increasing thermal stress. Startup requires VIN ≥ 3.6 V (UVLO rising threshold), so systems with cold-crank dips below 3.6 V may need hold-up capacitance to maintain regulation during brief sags.