Texas Instruments LM536023QPWPTQ1

Overview

LM536023QPWPTQ1 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 transient immunity (42 V for ≤500 ms) and low-noise operation are critical.

For engineers reviewing the LM536023QPWPTQ1 datasheet, LM536023QPWPTQ1 pinout, LM536023QPWPTQ1 application, or LM536023QPWPTQ1 equivalent, key selection considerations include its 2 A current rating (vs. 3 A LM53603-Q1), HTSSOP-16 thermal performance (R_θJA = 42.5°C/W), FPWM mode control, and BIAS pin architecture enabling efficient 3.3 V regulation from 3.5 V input.

Technical Context

The LM536023QPWPTQ1 implements current-mode control with valley-current limiting and automatic PWM/PFM transition, enabling stable regulation across 10 µA–2 A load range while maintaining 24 µA no-load quiescent current. Its oscillator supports external synchronization (1.9–2.3 MHz) and reduces frequency under high VIN (>20 V) to sustain regulation.

Internal 3.15 V VCC regulator powers control circuitry; BIAS pin connects directly to output for improved efficiency and line regulation. The open-drain RESET output features 12–45 µs glitch filtering and tracks output voltage with ±0.5% threshold accuracy relative to actual VOUT, eliminating need for external supervisory ICs.

Key Specifications

Pinout & Package

LM536023QPWPTQ1 uses a thermally enhanced 16-pin HTSSOP package (5.00 mm × 4.40 mm × 1.00 mm) with exposed thermal pad (EP) for PCB-level heat sinking. Pin 1–2 (SW), 12–13 (VIN), and 15–16 (PGND) are internally paralleled to reduce resistance and improve thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM53603QPWPTQ1, LM536023QPWPTQ1 offers lower current rating and reduced thermal stress at 2 A, while TPS543320RTWR trades integrated RESET and automotive qualification for smaller footprint and adjustable output - making LM536023QPWPTQ1 optimal for cost-sensitive, fixed-rail automotive modules requiring guaranteed power-good signaling.

Availability

LM536023QPWPTQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, infotainment USB hubs, and HUD projection controllers requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LM536023QPWPTQ1 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 and ISO/TS 16949-certified manufacturing.

The LM5360x-Q1 product line was designed specifically for automotive power rails - optimizing for wide input range, AEC-Q100 reliability, integrated diagnostics (RESET), and thermal robustness in engine bay and cabin environments.

FAQ

What is the maximum input voltage transient tolerance for LM536023QPWPTQ1?

The LM536023QPWPTQ1 withstands 42 V transients at the VIN pin for durations ≤500 ms and duty cycles ≤0.01%, per AEC-Q100 stress testing. This enables direct connection to automotive battery without external TVS diodes in most load-dump scenarios. LM536023QPWPTQ1 also tolerates –3 V to +40 V transients ≤100 ns, supporting robust cold-crank and jump-start conditions.

Does LM536023QPWPTQ1 require external feedback resistors for 3.3 V output?

No, LM536023QPWPTQ1 does not require external feedback resistors for 3.3 V output. Its FB pin is internally connected to a precision voltage divider calibrated for 3.3 V (±2%), eliminating BOM cost and layout area. External resistors are only needed if using the ADJ variant to set non-standard output voltages between 3.3 V and 6 V.

How does the BIAS pin improve efficiency at low input voltages?

The BIAS pin connects directly to the output voltage, powering internal regulators from VOUT instead of VIN. For LM536023QPWPTQ1 configured for 3.3 V output, this allows regulation from as low as 3.5 V input - significantly improving efficiency versus traditional buck converters that draw bias current from VIN. This architecture reduces power loss and enables cold-crank operation without pre-buck stages.

What is the purpose of the N/C pin (Pin 14) on LM536023QPWPTQ1?

Pin 14 (N/C) on LM536023QPWPTQ1 is not electrically connected to the die - it is an un-bonded mechanical placeholder for package symmetry and thermal uniformity. It must remain unconnected: no traces, vias, or solder mask openings should be placed on this pad. Routing signals or grounding this pin may cause mechanical stress or thermal imbalance in the HTSSOP package.

Can LM536023QPWPTQ1 be synchronized to an external clock?

Yes, LM536023QPWPTQ1 supports external frequency synchronization via the SYNC pin (Pin 6), accepting input clocks from 1.9 MHz to 2.3 MHz. When enabled, the internal oscillator locks to the external signal, eliminating beat frequencies in multi-rail systems. If synchronization is not required, SYNC must be tied to GND - floating this pin may induce noise and erratic switching behavior.