Texas Instruments LP5912Q1.5DRVRQ1

Overview

LP5912Q1.5DRVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified low-noise, low-I_Q LDO regulator delivering up to 500 mA output current with 1.5 V fixed output voltage, 12 µV_RMS output noise, 75 dB PSRR at 1 kHz, and 95 mV dropout at full load. It serves as a clean power source for RF and analog circuits in safety-critical vehicle subsystems.

For engineers reviewing the LP5912Q1.5DRVRQ1 datasheet, LP5912Q1.5DRVRQ1 pinout, LP5912Q1.5DRVRQ1 application, or LP5912Q1.5DRVRQ1 equivalent, key selection criteria include automotive-grade thermal reliability (–40°C to +125°C), ultra-low quiescent current (30 µA), integrated power-good flag, and stability with only 1-µF ceramic input/output capacitors.

Technical Context

The LP5912Q1.5DRVRQ1 employs a PMOS pass transistor architecture enabling low dropout and reverse-current protection without external diodes. Its internal soft-start limits inrush current during enable transitions, while the dedicated PG pin provides 140-µs delay power-good assertion synchronized to output regulation.

Designed specifically for automotive infotainment and ADAS sensor rails, it operates across 1.6 V to 6.5 V input range and maintains ±2% output tolerance for V_OUT ≥ 3.3 V - though the 1.5 V variant is specified at ±3% tolerance per datasheet Section 7.5. Thermal shutdown (160°C) and short-circuit protection ensure robust operation under fault conditions.

Key Specifications

Pinout & Package

LP5912Q1.5DRVRQ1 uses a 6-pin WSON package (DRV) with 2.00 mm × 2.00 mm body size and exposed thermal pad. The thermal pad must be connected to PCB ground plane via thermal vias to maintain junction temperature within –40°C to +125°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TJA1057T/3 (non-LDO) and TPS7B8133QDGNRQ1 (3.3 V variant), LP5912Q1.5DRVRQ1 uniquely delivers 1.5 V at 500 mA with best-in-class 12 µV_RMS noise and automotive Grade 1 qualification - making it irreplaceable for noise-sensitive 1.5 V analog rails where voltage accuracy and spectral purity are non-negotiable.

Availability

LP5912Q1.5DRVRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and extended temperature support.

Supply support for LP5912Q1.5DRVRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and communications markets.

The LP5912-Q1 product line delivers low-noise, low-I_Q LDOs engineered for RF/analog power integrity in automotive safety-critical systems - targeting infotainment, ADAS, and body electronics where EMI resilience and thermal robustness are mandatory.

FAQ

What is the output voltage tolerance specification for LP5912Q1.5DRVRQ1?

The LP5912Q1.5DRVRQ1 has a fixed 1.5 V output with ±3% tolerance over temperature and load, as confirmed in Section 7.5 of the datasheet for V_OUT(NOM) < 3.3 V. This ensures predictable performance for 1.5 V logic and analog circuits across –40°C to +125°C ambient conditions.

Does LP5912Q1.5DRVRQ1 require an external noise-bypass capacitor?

No, LP5912Q1.5DRVRQ1 does not require an external noise-bypass capacitor. Its 12 µV_RMS output noise (10 Hz–100 kHz) is achieved internally, validated across all operating conditions - eliminating BOM cost and PCB area typically needed for bypass caps in RF-sensitive designs.

How is the power-good (PG) function implemented on LP5912Q1.5DRVRQ1?

The PG pin on LP5912Q1.5DRVRQ1 is an open-drain output that asserts high after 140 µs once V_OUT reaches 90–94% of nominal voltage. It requires an external pullup resistor and provides system-level sequencing feedback - critical for synchronizing boot sequences in automotive ECUs.

What thermal management is required for LP5912Q1.5DRVRQ1 in high-power applications?

LP5912Q1.5DRVRQ1 requires connection of its exposed thermal pad to a PCB ground plane using ≥2 thermal vias. With R_θJA = 71.2°C/W (High-K board), continuous 500 mA operation at 1.5 V demands careful ambient derating - e.g., max 85°C ambient at full load to stay within 125°C junction limit.

Is LP5912Q1.5DRVRQ1 pin-compatible with other devices in the LP5912-Q1 family?

Yes, all LP5912-Q1 variants - including LP5912Q1.5DRVRQ1 - share identical 6-pin WSON (DRV) packaging and pinout. Voltage variants differ only in internal feedback network; no PCB layout change is needed when selecting alternate output voltages within the family.