Texas Instruments TPS61005DGSR

Overview

TPS61005DGSR from Texas Instruments is a fixed-output 3.3 V, non-synchronous boost converter designed for single- or dual-cell battery systems. It delivers up to 250 mA output current from 1.8 V input, starts up into full load at 0.9 V, operates with ≤50 µA quiescent current, and integrates low-battery detection (LBI/LBO) for portable medical diagnostics and wireless headsets.

For engineers reviewing the TPS61005DGSR datasheet, TPS61005DGSR pinout, TPS61005DGSR application, or TPS61005DGSR equivalent, key selection criteria include minimum start-up voltage (0.9 V), fixed 3.3 V output accuracy (±3.3% over temperature), integrated antiringing switch for EMI reduction, and MSOP-10 package compatibility with space-constrained battery-powered designs.

Technical Context

The TPS61005DGSR uses a fixed-frequency (500 kHz) current-mode PWM controller with automatic transition into power-save mode below ~10 mA load to sustain >85% efficiency across 1–100 mA. Its internal 1.1 A switch current limit and integrated antiringing circuit clamp SW-node ringing to VBAT during discontinuous conduction, reducing radiated emissions without external snubbers.

It implements undervoltage lockout (UVLO ≈0.7 V), enables shutdown via EN pin (I_EN < 1 µA), and supports system-level battery monitoring through LBI (500 mV threshold) and open-drain LBO outputs - all while maintaining operation from –40°C to 85°C ambient.

Key Specifications

Pinout & Package

TPS61005DGSR is housed in a 10-pin VSSOP (DGS) package measuring 3.00 mm × 3.00 mm with 0.5 mm pitch, optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61005DGSR, TPS61022RGET offers higher current and frequency at the expense of larger quiescent current (25 µA vs. <50 µA), while MAX77801EWL+ adds LDO filtering but raises solution height and BOM count - making TPS61005DGSR optimal for cost-sensitive, space-constrained, single-cell battery applications demanding proven reliability and minimal external components.

Availability

TPS61005DGSR is available at Aetrix Electronics and suitable for wireless headsets, portable medical diagnostic equipment, remote controls, pagers, and cordless phones requiring stable component supply across long production lifecycles.

Supply support for TPS61005DGSR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS6100x family was engineered specifically for ultra-low-voltage battery-powered systems - prioritizing sub-1 V start-up, micropower operation, and integrated protection features to extend runtime in portable consumer and medical devices.

FAQ

What is the minimum input voltage required for TPS61005DGSR to start up into a full load?

The TPS61005DGSR starts up into a full 100 mA load at 0.9 V input voltage across the full –40°C to 85°C temperature range. Once operating, it continues regulation down to 0.8 V input. This capability enables reliable use with single NiMH or alkaline cells nearing end-of-discharge, where terminal voltage drops below 1.0 V. The 0.9 V start-up threshold is guaranteed by TI's production testing and documented in Section 7.5 of the SLVS279D datasheet.

Does TPS61005DGSR require external feedback resistors to set its output voltage?

No, TPS61005DGSR does not require external feedback resistors. It is a fixed-output variant with an internal resistor divider that sets VOUT to 3.3 V. Pin 3 (FB) must remain unconnected per the datasheet - connecting external components risks output voltage inaccuracy or instability. This simplifies design and reduces BOM count compared to adjustable versions like TPS61000 or TPS61007, which do require FB resistor networks.

How does the low-battery detection function work on TPS61005DGSR?

The TPS61005DGSR uses pins LBI (Pin 9) and LBO (Pin 10) for low-battery detection. LBI compares applied voltage to an internal 500 mV reference; when LBI falls below this threshold, LBO (open-drain) pulls low. For fixed-output parts, LBI is typically connected to a resistor divider from VBAT to GND to set the alert point - e.g., 2.4 V battery = 500 mV at LBI. If unused, LBI must be tied to GND or VBAT; floating LBI causes undefined behavior. LBO requires an external pullup resistor to VOUT.

What package type and dimensions does TPS61005DGSR use?

TPS61005DGSR uses the VSSOP-10 (DGS) package: a 10-pin, leaded surface-mount package with 3.00 mm × 3.00 mm body size and 0.5 mm pin pitch. It is not RoHS-compliant by default (lead finish is SnPb); however, TI offers lead-free variants under separate part numbers. Thermal resistance is R_θJA = 160.6°C/W, requiring adequate copper pour on the GND pad for sustained 250 mA operation at elevated ambient temperatures.

Can TPS61005DGSR be used with a 33 µH inductor and what is the maximum recommended saturation current?

Yes, TPS61005DGSR is validated with a 33 µH inductor (e.g., Coilcraft DO3308P-333). The maximum switch current limit is 1.1 A, so the inductor's saturation current rating must exceed 1.1 A to prevent core saturation and potential device failure. TI recommends selecting an inductor with ≥1.5 A saturation current to provide margin under worst-case conditions including temperature rise and DC bias. Inductor DCR should be ≤150 mΩ to minimize conduction loss and maintain >85% efficiency at full load.