Texas Instruments TPS709135DBVR

Overview

TPS709135DBVR from Texas Instruments is a 1.35-V fixed-output, ultra-low-quiescent-current (1 µA) LDO linear regulator in SOT-23-5 package, designed for battery-powered always-on systems requiring minimal idle power dissipation. It delivers up to 150 mA output current, features reverse-current protection, thermal shutdown, and operates across 2.7 V to 30 V input range with ±2% output accuracy over temperature.

For engineers reviewing the TPS709135DBVR datasheet, TPS709135DBVR pinout, TPS709135DBVR application, or TPS709135DBVR equivalent, key selection criteria include quiescent current (1 µA), shutdown current (150 nA), dropout voltage at 150 mA (e.g., 460–1000 mV depending on VOUT), reverse-current protection (10 nA typical), and compatibility with 2.2-µF ceramic output capacitance for stability.

Technical Context

The TPS709135DBVR uses a PMOS pass transistor architecture enabling low dropout voltage and inherent reverse-current blocking without external components. Its precision band-gap reference and error amplifier ensure ±2% DC output accuracy across –40°C to +125°C junction temperature.

Functional modes are controlled via the EN pin: high (>0.9 V) enables regulation with 1 µA ground current; low (<0.4 V) disables output and reduces IN-pin current to 150 nA typical. The device includes internal current limit (min 200 mA), thermal shutdown (158°C trip), and undervoltage lockout for robust operation.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed thermal pad electrically connected to GND; requires PCB GND plane connection for optimal thermal performance per RθJB = 39.5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS70912DBVR and TPS70933DBVR, the TPS709135DBVR uniquely satisfies systems needing precisely 1.35 V-such as specialized sensor biasing or custom low-voltage logic-without sacrificing ultra-low IQ, reverse-current blocking, or wide-input capability.

Availability

TPS709135DBVR is available at Aetrix Electronics and suitable for smoke detectors, motion sensors, electricity meters, and appliance battery packs requiring stable component supply with long-term lifecycle assurance.

Supply support for TPS709135DBVR 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 power management ICs for industrial, automotive, and consumer applications.

The TPS709 series is part of TI's ultra-low-IQ LDO portfolio, engineered specifically for energy-constrained, battery-operated systems where multi-year runtime and robust fault protection are mandatory design requirements.

FAQ

What is the output voltage tolerance of the TPS709135DBVR over temperature?

The TPS709135DBVR guarantees ±2% DC output accuracy across its full operating junction temperature range of –40°C to +125°C. This specification applies under recommended conditions: VIN = VOUT(typ) + 1 V or 2.7 V (whichever is greater), IOUT = 1 mA, and CIN = COUT = 2.2 µF ceramic. The TPS709135DBVR achieves this via a precision band-gap reference and error amplifier topology optimized for thermal stability.

Does the TPS709135DBVR require an external pull-up resistor on the EN pin?

No, the TPS709135DBVR does not require an external pull-up resistor on the EN pin. It includes an internal 300-nA current source that pulls EN high, allowing the pin to be left floating to enable the device. Connecting EN directly to VIN is prohibited; the EN pin is clamped to 6.5 V internally and must not exceed 7 V absolute maximum to avoid damage.

Can the TPS709135DBVR operate with input voltages below 2.7 V?

No, the TPS709135DBVR is not specified for operation below 2.7 V input. Its recommended operating input voltage range is strictly 2.7 V to 30 V. Operation below 2.7 V may result in loss of regulation, increased ground current, or failure to start up reliably. For sub-2.7-V applications, alternative regulators such as the TPS7A05 series should be evaluated.

What is the minimum output capacitance required for stability with the TPS709135DBVR?

The TPS709135DBVR requires a minimum effective output capacitance of 2.2 µF ceramic (X5R or X7R dielectric) for stable operation. Effective capacitance accounts for DC bias, temperature, and tolerance derating; a 2.2-µF, 6.3-V X7R capacitor is the standard recommendation. ESR must be between 0 Ω and 0.2 Ω, and maximum stable capacitance is 47 µF.

How does reverse-current protection function in the TPS709135DBVR?

The TPS709135DBVR integrates active reverse-current protection that blocks current flow from OUT to IN whenever VOUT > VIN, limiting leakage to 10 nA typical. This feature is always active-regardless of EN state-and functions down to VOUT ≥ 1.8 V. Below 1.8 V, reverse conduction may occur if VIN < VOUT; the TPS709135DBVR also specifies a maximum reverse bias of 3×VOUT(nom) or 6.5 V, whichever is lower.