Texas Instruments TPS70618DBVT

Overview

TPS70618DBVT from Texas Instruments is a fixed-output 1.8-V, 150-mA ultralow-quiescent-current LDO voltage regulator in SOT-23-5 package, featuring 1 µA typical quiescent current, 245 mV dropout at 50 mA, ±2% output accuracy over –40°C to +125°C, and reverse current protection. It serves as a precision power rail for always-on battery-powered subsystems such as sensor interfaces and real-time clocks.

For engineers reviewing the TPS70618DBVT datasheet, TPS70618DBVT pinout, TPS70618DBVT application, or TPS70618DBVT equivalent, key selection criteria include shutdown current (150 nA), thermal shutdown threshold (158°C), PSRR (80 dB @ 10 Hz), output noise (190 µV_RMS), and compatibility with 2.2-µF ceramic output capacitors.

Technical Context

The TPS70618DBVT employs a PMOS pass transistor architecture enabling low dropout and inherent reverse current blocking without external diodes. Its band-gap reference and error amplifier deliver 2% DC accuracy across temperature while maintaining ultralow IQ via adaptive biasing.

Functional modes include normal regulation (VIN ≥ VOUT + VDO), dropout operation (VIN < VOUT + VDO but > VIN(min)), and active-low enable–controlled shutdown with 150 nA ISHDN. Thermal shutdown (158°C trip, 140°C reset) and current limit (200 mA min) operate independently of EN state.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, thermally enhanced with GND-connected die pad requiring PCB ground plane connection for R_θJA = 212.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70618DBVT, TPS70618DBVR offers identical performance in tape-and-reel packaging for high-volume manufacturing, while MCP1700T-1802E/TT trades reverse current protection and lower dropout for marginally higher output current - making it suitable only where backfeed risk is absent and 250 mA load is required.

Availability

TPS70618DBVT is available at Aetrix Electronics and suitable for smartphone power management, wearable sensor hubs, medical patch monitors, solid-state drive controller rails, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for TPS70618DBVT 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.

The TPS706 series was developed specifically for ultralow-power, always-on applications in battery-constrained devices - emphasizing sub-µA quiescent current, reverse current blocking, and robust thermal protection without sacrificing accuracy or noise performance.

FAQ

What is the maximum input voltage rating for the TPS70618DBVT?

The TPS70618DBVT has an absolute maximum input voltage (VIN) of 7 V, but its recommended operating range is 2.7 V to 6.5 V. Exceeding 7 V risks permanent damage per Absolute Maximum Ratings. For reliable operation, maintain VIN ≤ 6.5 V and ensure sufficient headroom above 1.8 V to meet dropout requirements - e.g., ≥2.045 V at 50 mA load.

Does the TPS70618DBVT require an input capacitor?

The TPS70618DBVT does not require an input capacitor for stability, but TI strongly recommends a 0.1–2.2 µF ceramic capacitor from IN to GND. This improves PSRR, suppresses high-frequency noise from upstream sources, and enhances transient response - especially critical in noisy DC/DC-fed systems. X5R or X7R dielectrics are preferred for stable capacitance over temperature and bias.

Can the TPS70618DBVT be used without connecting the EN pin?

Yes - the EN pin of the TPS70618DBVT can be left floating to enable the device permanently, as its internal pull-up ensures activation when unconnected. However, for deterministic behavior in noisy environments, TI recommends tying EN directly to IN. Leaving EN floating is acceptable only in space-constrained layouts where no external control is needed and EMI immunity is verified.

What output capacitor value is required for stability with the TPS70618DBVT?

The TPS70618DBVT requires a minimum effective output capacitance of 2.2 µF (ceramic, X5R/X7R) for stability at 1.8 V output. The maximum supported is 47 µF. Effective capacitance accounts for DC bias, temperature, and tolerance derating - so a nominal 2.2 µF/10 V X7R capacitor is standard. ESR must remain between 0 Ω and 0.2 Ω.

How does reverse current protection work in the TPS70618DBVT?

The TPS70618DBVT integrates active reverse current protection that blocks current flow from OUT to IN whenever VOUT > VIN, reducing leakage to 10 nA typical. This feature operates continuously - independent of EN state or output voltage level above 1.8 V - eliminating external blocking diodes. It prevents backup battery discharge in dual-supply systems and avoids cross-conduction in OR-ing configurations.