Texas Instruments TPS61391RTER

Overview

TPS61391RTER from Texas Instruments is a 700-kHz PWM boost converter with integrated 85-V switch FET, current mirror (4:5 and 1:5 gain options), and high-speed optical power protection (0.5-µs response). It operates from 2.5 V to 5.5 V input and delivers up to 85 V output with 1000 mA peak switch current, specifically designed for avalanche photodiode (APD) biasing in optical line terminals and high-voltage sensor supplies.

For engineers reviewing the TPS61391RTER datasheet, TPS61391RTER pinout, TPS61391RTER application, or TPS61391RTER equivalent, this page provides verified functional identity, validated QFN-16 pin mapping, confirmed APD biasing architecture, exact current mirror gain tolerances (±4% for MON1, ±5% for MON2), and real-world optical protection timing behavior - all directly extracted from TI's production-grade SLVSFE7 datasheet.

Technical Context

The TPS61391RTER implements a fixed-frequency PWM control loop with PFM mode at light load to maintain efficiency across 0–8 mA output current. Its dual-ratio current mirror (MON1 = 4:5, MON2 = 1:5) enables precise APD current monitoring with programmable short-circuit threshold via ISHORT resistor, while the integrated series protection FET clamps APD voltage within 0.5 µs when optical overload occurs.

It features three independent power domains: VIN (2.5–5.5 V for main regulator), AVCC (3.3 V nominal for analog monitor circuitry), and APD output (up to 85 V). The device includes UVLO (2.5 V ±200 mV hysteresis), thermal shutdown (150 °C), and soft-start (4.8 ms), all implemented in a single-die WQFN-16 package with exposed thermal pad tied to GND.

Key Specifications

Pinout & Package

TPS61391RTER uses a 3 mm × 3 mm × 0.75 mm WQFN-16 package (RTE) with exposed thermal pad soldered to PCB ground for thermal and EMI performance. Pin numbering follows standard top-view orientation with Pin 1 index area marked.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage APD bias applications.

Compared with MAX3271ETA+ and LT3482EDD, the TPS61391RTER uniquely integrates dual-ratio current mirroring, sub-microsecond optical protection, and multi-rail power management in a single 3×3 mm package - reducing solution size by >40% and eliminating calibration drift from external sense elements.

Availability

TPS61391RTER is available at Aetrix Electronics and suitable for optical line terminal (OLT), LiDAR receiver, high-voltage sensor supply, and fiber-optic test equipment applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS61391RTER 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, specializing in analog, embedded processing, and high-reliability silicon solutions for industrial, automotive, and communications markets.

The TPS61391RTER belongs to TI's high-voltage DC/DC converter product line, engineered specifically for precision APD biasing in next-generation optical infrastructure - emphasizing integration of protection, monitoring, and regulation in a thermally optimized package.

FAQ

What is the maximum output voltage supported by the TPS61391RTER?

The TPS61391RTER supports an output voltage range up to 85 V, as specified in the absolute maximum ratings and confirmed in the recommended operating conditions table of the SLVSFE7 datasheet. This rating applies across the full temperature range (–40°C to 125°C) and is enabled by its integrated 85-V rated internal switch FET. Operation above 85 V risks permanent device damage and violates absolute maximum limits.

How does the TPS61391RTER implement optical power protection?

The TPS61391RTER implements optical power protection using an integrated series FET in the APD power path, controlled by the ISHORT pin. When APD current exceeds the threshold set by the external ISHORT-to-GND resistor, the FET rapidly increases its on-resistance to clamp the APD voltage. This response occurs within 0.5 µs typical, and recovery to normal operation is fully automatic once the optical overload condition ends.

Can both MON1 and MON2 pins be used simultaneously on the TPS61391RTER?

Yes, both MON1 (4:5 gain) and MON2 (1:5 gain) pins operate concurrently on the TPS61391RTER. They provide proportional current outputs referenced to the same APD current sensed at MONIN, enabling simultaneous use for primary feedback (e.g., MON1 to TIA) and secondary monitoring or safety cutoff (e.g., MON2 to comparator). Each output is independently buffered and can drive separate resistive loads to ground.

What is the purpose of the CAP pin on the TPS61391RTER?

The CAP pin on the TPS61391RTER accepts an external 10–100 nF ceramic capacitor to ground to reduce high-frequency noise coupling into the current mirror circuitry. This capacitor filters switching noise that could otherwise corrupt MON1/MON2 output accuracy, especially critical in low-current APD monitoring applications where signal integrity directly impacts dynamic range and measurement resolution.

Does the TPS61391RTER require external compensation components?

No, the TPS61391RTER uses an internally compensated voltage-mode PWM controller and does not require external compensation components. Its feedback loop is stabilized through the internal error amplifier and fixed-frequency modulator architecture. Designers only need to select the FB resistor divider for output voltage setting - no type-II or type-III compensation network is needed, simplifying layout and reducing BOM count.