Texas Instruments LM2936QDT-5.0/NOPB

Overview

LM2936QDT-5.0/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified ultralow-quiescent-current LDO voltage regulator delivering a fixed 5.0 V output at up to 50 mA, with ≤15 μA quiescent current at 100 μA load, 200 mV typical dropout at 50 mA, ±2% initial output tolerance, and reverse battery protection. It serves as the primary power supply for always-on automotive microcontrollers and sensor interfaces.

For engineers reviewing the LM2936QDT-5.0/NOPB datasheet, LM2936QDT-5.0/NOPB pinout, LM2936QDT-5.0/NOPB application, or LM2936QDT-5.0/NOPB equivalent, key selection criteria include its 5.5–40 V input range, −40°C to +125°C operation, 10 µF/0.3–8 Ω COUT stability requirements, and TO-252-3 surface-mount package thermal performance.

Technical Context

The LM2936QDT-5.0/NOPB uses a PNP pass transistor architecture enabling low dropout and inherent reverse-polarity protection without external components. Its internal bandgap reference and error amplifier maintain regulation across line, load, and temperature with ±3% total output tolerance.

Thermal shutdown activates at ~160°C junction temperature and cycles autonomously until ambient conditions normalize; short-circuit current limiting caps peak output at 65–250 mA depending on VIN. No UVLO or OVSD circuitry is integrated - regulation begins when VIN exceeds VOUT + 1 V.

Key Specifications

Pinout & Package

LM2936QDT-5.0/NOPB is housed in a 3-pin TO-252 (NDP) surface-mount package with exposed thermal pad. The package measures 6.10 mm × 6.58 mm and features low 50.5°C/W junction-to-ambient thermal resistance (R_θJA) under JEDEC High-K board conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2936QDT-5.0/NOPB, TPS7B6750QDDARQ1 trades reverse-battery hardening for marginally better dropout, while NCP163AMX500TBG achieves ultra-low IQ at the cost of automotive qualification and input voltage range - making LM2936QDT-5.0/NOPB the sole option meeting full ISO 16750/7637 compliance with integrated protection.

Availability

LM2936QDT-5.0/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, body control modules, and ADAS subsystems requiring stable component supply with guaranteed long-term manufacturability and automotive-grade traceability.

Supply support for LM2936QDT-5.0/NOPB 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 ICs, with decades of experience in high-reliability power management solutions.

The LM2936Q series was designed specifically for automotive battery-powered systems demanding ultralow quiescent current, extended temperature operation, and integrated transient protection - targeting always-on ECUs and sensor nodes.

FAQ

What is the minimum input voltage required for regulation in LM2936QDT-5.0/NOPB?

The LM2936QDT-5.0/NOPB enters regulation when input voltage exceeds VOUT + 1 V, so minimum functional VIN is 6.0 V. However, stable operation with full 50 mA load and specified ripple rejection requires VIN ≥ 7.0 V (VOUT + 2 V) to ensure adequate headroom and dynamic performance. Below 6.0 V, the output tracks the input linearly without regulation.

Can I use a ceramic capacitor for COUT with LM2936QDT-5.0/NOPB?

Yes, but only with a series resistor to meet the mandatory 0.3–8 Ω ESR requirement. The LM2936QDT-5.0/NOPB requires this ESR for loop stability; standard ceramic capacitors have near-zero ESR and will cause oscillation. Use X5R or X7R dielectric MLCCs with a 500 mΩ–1 Ω resistor in series, placed adjacent to the OUT pin.

Does LM2936QDT-5.0/NOPB include a shutdown pin?

No. The LM2936QDT-5.0/NOPB is the standard 3-pin TO-252 variant without shutdown functionality. Shutdown capability is exclusive to the LM2936QHBMA (8-pin SOIC with SD pin). For on/off control of LM2936QDT-5.0/NOPB, external MOSFET switching on the IN rail is required.

What is the maximum continuous output current for LM2936QDT-5.0/NOPB at 85°C ambient?

At TA = 85°C, the LM2936QDT-5.0/NOPB's maximum continuous output current is limited by thermal dissipation. With R_θJA = 50.5°C/W and TJ_MAX = 150°C, PD_MAX = (150 − 85)/50.5 ≈ 1.29 W. At VIN = 13.5 V and VOUT = 5.0 V, IOUT_MAX ≈ 1.29/(13.5 − 5.0) ≈ 152 mA - but the device's internal current limit caps output at 65–250 mA depending on VIN, so 50 mA remains the rated maximum per datasheet specifications.

How does LM2936QDT-5.0/NOPB handle reverse battery connection?

When −15 V is applied to the IN pin with GND and OUT referenced normally, the LM2936QDT-5.0/NOPB blocks conduction and holds OUT near 0 V (≤ −0.3 V), preventing damage to downstream circuitry. This reverse-battery protection is intrinsic to its PNP pass transistor architecture and requires no external components - a key differentiator for automotive battery systems.