Texas Instruments TPS7B91018DBVR

Overview

TPS7B91018DBVR from Texas Instruments is a 150mA, 40V-input ultra-low-quiescent-current LDO linear regulator with 1.8μA IQ at zero load, 1.2V–12V adjustable output, and 900mV typical dropout at 150mA - designed for battery-powered microcontroller power rails in industrial sensing and always-on infrastructure nodes.

For engineers reviewing the TPS7B91018DBVR datasheet, TPS7B91018DBVR pinout, TPS7B91018DBVR application, or TPS7B91018DBVR equivalent, key selection criteria include its 1.8μA no-load IQ, 40V max input, thermal shutdown (160°C), foldback current limiting, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS7B91018DBVR employs a CMOS pass transistor with leakage-null control circuitry to maintain output accuracy across –40°C to +125°C and wide VIN–VOUT headroom. Its internal soft-start limits inrush current, and foldback overcurrent protection transitions from brick-wall (ICL = 270mA typ) to scaled limit below 50% VOUT(nom).

It operates in two distinct modes: normal regulation (VIN > VOUT + VDO) and dropout (VIN < VOUT + VDO), where transient response degrades significantly. PSRR reaches 70dB at 1kHz and 43dB at 100kHz with 1μF COUT, and stability is guaranteed with 1.0μF–47μF ceramic output capacitors.

Key Specifications

Pinout & Package

TPS7B91018DBVR is housed in a 2.9mm × 2.8mm 5-pin SOT-23 (DBV) package with exposed pad for thermal enhancement. Pins 3 and 4 are NC (not connected); grounding them improves thermal performance but is not required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7B91018DBVR, the TPS7B8133QDGNRQ1 adds automotive qualification and removes adjustability, while the NCP163AMX330TBG trades protection and PSRR for lower IQ - making TPS7B91018DBVR the balanced choice for industrial and medical designs requiring programmability, robustness, and ultra-low IQ.

Availability

TPS7B91018DBVR is available at Aetrix Electronics and suitable for smart metering, automotive body electronics, industrial sensor nodes, and medical wearables requiring stable component supply with long-term manufacturability and extended temperature support.

Supply support for TPS7B91018DBVR 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 power management ICs, with decades of expertise in high-reliability LDO design for industrial and automotive markets.

The TPS7B91 family was engineered specifically for ultra-low-power, wide-input-voltage applications in battery-backed and always-on infrastructure systems - emphasizing quiescent current optimization, thermal resilience, and fault robustness.

FAQ

What is the minimum input voltage required for TPS7B91018DBVR to regulate a 5.0V output?

The TPS7B91018DBVR requires VIN ≥ VOUT + VDO to maintain regulation. With a typical dropout voltage of 900mV at 150mA, the minimum input is 5.9V. At lighter loads (e.g., 10mA), VDO drops to ~440mV, allowing regulation from as low as 5.44V - confirmed in Figure 5-14 of the datasheet.

Can TPS7B91018DBVR operate with a 0.47μF output capacitor?

Yes - the TPS7B91018DBVR is stable with COUT ≥ 1.0μF per the datasheet's Recommended Operating Conditions. While 0.47μF appears in some typical application schematics (e.g., Figure 7-1), it is used only with specific compensation and does not guarantee stability across temperature and load. For production designs, use ≥1.0μF ceramic capacitor.

Does TPS7B91018DBVR support adjustable output voltages?

Yes - TPS7B91018DBVR is an adjustable LDO. Its output voltage is set by an external resistor divider between OUT, FB (connected internally to Pin 5), and GND. The internal reference is 1.205V, enabling precise 1.2V–12V programming per Equation 2 in the datasheet.

What protection features are integrated into TPS7B91018DBVR?

The TPS7B91018DBVR integrates foldback overcurrent limiting, thermal shutdown (160°C trip, 140°C reset), and UVLO (1.72V rising threshold). It also features leakage-null control for accuracy retention at high temperature and internal soft-start to limit inrush current - all without requiring external components.

Is TPS7B91018DBVR pin-compatible with other SOT-23-5 LDOs?

No - TPS7B91018DBVR uses a nonstandard pinout: IN (1), GND (2), NC (3), NC (4), OUT (5). Most SOT-23-5 LDOs place OUT on Pin 3 or 4. Direct replacement requires PCB redesign. Always verify pin functions using Table 4-1 in the SBVS439A datasheet before substitution.