Texas Instruments TPS61086DRCT

Overview

TPS61086DRCT from Texas Instruments is a 10-pin VSON synchronous boost DC-DC converter with integrated 2.0-A/0.13-Ω N-channel MOSFET, 1.2-MHz fixed-frequency PWM control, and PFM/PWM mode selection via MODE pin. It delivers up to 18.5-V output from 2.3–6.0-V input and supports handheld GPS receivers requiring stable 12-V bias under variable battery conditions.

For engineers reviewing the TPS61086DRCT datasheet, TPS61086DRCT pinout, TPS61086DRCT application, or TPS61086DRCT equivalent, key selection considerations include its externally compensated current-mode architecture, adjustable soft-start (SS pin), thermal shutdown (150°C), undervoltage lockout (2.3-V threshold), and dual-mode operation for efficiency vs. noise trade-offs in portable power systems.

Technical Context

The TPS61086DRCT implements a current-mode, quasi-constant-frequency boost topology with adaptive off-time control, enabling superior line and load transient response. Its transconductance error amplifier (107 μA/V) interfaces with external R_COMP/C_COMP for stability tuning across varying output voltages and inductor values.

Operation spans two distinct functional modes: PFM at light loads (inductor peak current < 0.6 A) for >90% efficiency down to 1 mA, and forced PWM (MODE = high) for fixed 1.2-MHz switching and predictable EMI filtering. Feedback regulation targets 1.238 V ±0.008 V at FB, supporting precise output voltage setting via resistor divider.

Key Specifications

Pinout & Package

TPS61086DRCT uses a 3.00 mm × 3.00 mm, 10-pin VSON package with exposed thermal pad (PGND-connected) for enhanced power dissipation. Pin 1 is COMP; pin 10 is SS. The thermal pad must be soldered to PCB ground plane per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with TPS61086DRCT, TPS61085DRCT offers identical features at reduced current capability-ideal for lower-power GPS modules-while MAX17062ETA+ trades pin compatibility and PFM flexibility for higher switching frequency, demanding full revalidation.

Availability

TPS61086DRCT is available at Aetrix Electronics and suitable for handheld GPS receivers, digital still cameras, TFT LCD bias supplies, and DSL modem line drivers requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS61086DRCT 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 and embedded processing technologies, with over 50 years of power management innovation.

The TPS61086DRCT belongs to TI's high-efficiency boost converter product line, designed specifically for space-constrained portable electronics needing regulated high-voltage outputs from single-cell batteries or low-voltage rails.

FAQ

What is the minimum input voltage required for TPS61086DRCT to start switching?

The TPS61086DRCT incorporates an undervoltage lockout (UVLO) circuit that disables operation when VIN falls below 2.2 V (falling) and re-enables at 2.3 V (rising). Therefore, the device requires ≥2.3 V on the IN pin to initiate switching. Below this threshold, EN remains inactive regardless of logic level, ensuring reliable startup from partially discharged Li-ion cells or noisy 3.3-V rails.

How does the MODE pin affect efficiency and noise performance in TPS61086DRCT?

When MODE is pulled low, TPS61086DRCT operates in Power Save Mode (PFM), skipping pulses at light loads to maintain >90% efficiency down to 1 mA-but generating variable-frequency noise. When MODE is pulled high, it forces continuous PWM at 1.2 MHz, sacrificing light-load efficiency for predictable EMI spectrum and easier filtering in noise-sensitive GPS or audio applications.

Can TPS61086DRCT generate 18.5 V output from a 2.5-V input, and what limits this capability?

Yes, TPS61086DRCT supports up to 18.5-V output from 2.5-V input, limited by its 2.0-A minimum switch current rating, 0.13-Ω R_DS(on), and thermal design. At 2.5-V input and 18.5-V/200-mA output, efficiency drops to ~82%; sustained operation requires adequate PCB copper area on the thermal pad and <30°C ambient to avoid thermal shutdown activation at 150°C junction temperature.

What is the purpose of the SS pin on TPS61086DRCT, and how is it configured?

The SS (soft-start) pin on TPS61086DRCT controls inrush current during startup by ramping the internal current limit from 0 A to full scale. A 100-nF capacitor between SS and GND provides ~10-ms soft-start time; the internal 10-μA current source charges the capacitor until output reaches 90% of target voltage. Leaving SS open disables soft-start, risking input rail sag in battery-powered systems.

Does TPS61086DRCT require external compensation components, and why?

Yes, TPS61086DRCT requires external R_COMP and C_COMP on the COMP pin because its transconductance error amplifier is intentionally uncompensated. This allows designers to tailor loop stability for specific output voltages, inductor values (e.g., 3.3 μH vs. 4.7 μH), and capacitor ESR-critical for maintaining phase margin in 12-V/500-mA DSL modem supplies or 18.5-V flash chargers.