Texas Instruments TPS61003DGS

Overview

TPS61003DGS from Texas Instruments is a fixed-output 2.8 V, non-synchronous boost converter optimized 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 0.8 V, integrates low-battery detection (LBI/LBO), and operates in power-save mode for high light-load efficiency. It is used in portable medical diagnostics and wireless headsets requiring stable low-voltage rail generation.

For engineers reviewing the TPS61003DGS datasheet, TPS61003DGS pinout, TPS61003DGS application, or TPS61003DGS equivalent, key selection criteria include minimum start-up voltage (0.8 V), fixed 2.8 V output accuracy (±3.6% over temp/load), integrated antiringing switch for EMI reduction, and MSOP-10 package compatibility with space-constrained handheld designs.

Technical Context

The TPS61003DGS implements a fixed-frequency (500 kHz nominal), current-mode PWM controller with pulse-skipping power-save mode below ~10 mA load. Its internal 1.1 A switch current limit and integrated antiringing circuit suppress SW-node ringing during discontinuous conduction mode, reducing radiated EMI without external snubbers.

It features undervoltage lockout (~0.7 V), enable-controlled shutdown (<0.5 µA quiescent), and a dedicated low-battery comparator with 500 mV threshold and 10 mV hysteresis on LBI/LBO pins-active only when EN is high. The FB pin is unconnected (NC) in fixed-output variants like TPS61003DGS.

Key Specifications

Pinout & Package

TPS61003DGS is housed in a 10-pin VSSOP (MSOP) package, 3.00 mm × 3.00 mm body size, with exposed thermal pad (not electrically connected). Pinout conforms to TI's DGS package standard for the TPS6100x family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61002DGS and TPS61004DGS, the TPS61003DGS provides optimal voltage alignment for 2.8 V I/O standards (e.g., certain Bluetooth modules and low-dropout LDO inputs), avoiding under-voltage brownouts or unnecessary linear regulation losses.

Availability

TPS61003DGS is available at Aetrix Electronics and suitable for portable medical diagnostics, wireless headsets, and remote controls requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS61003DGS 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, embedded processing, and power management technologies, with decades of expertise in battery-powered system solutions.

The TPS6100x product line was designed specifically for ultra-low-voltage, high-efficiency boost conversion in single- and dual-cell battery applications-prioritizing start-up robustness, light-load efficiency, and integrated system supervision.

FAQ

What is the minimum input voltage required for TPS61003DGS to start up into a full load?

The TPS61003DGS starts up into a full load at 0.8 V minimum input voltage across the full temperature range (–40°C to 85°C), as verified in the datasheet's Electrical Characteristics table under "Input voltage for start up." This capability allows reliable operation deep into the discharge curve of single alkaline or NiMH cells. The TPS61003DGS maintains regulation down to 0.8 V once started.

Is the FB pin used on the TPS61003DGS, and what happens if it's left floating?

No, the FB pin is not used on the TPS61003DGS-it is a fixed-output variant with internal resistor divider, so FB must be left unconnected (NC). Leaving it floating is safe per datasheet guidance; however, connecting it to GND or VOUT is unnecessary and may introduce noise coupling. The TPS61003DGS achieves its 2.8 V output without any external feedback components.

How does the low-battery detection work on the TPS61003DGS, and can it be disabled?

The TPS61003DGS uses the LBI pin to monitor battery voltage via an internal 500 mV comparator; when LBI drops below this threshold, LBO asserts low. To disable the function, connect LBI directly to GND (or VBAT)-never leave it floating. LBO remains high-impedance when EN = GND. This behavior is confirmed in the Pin Functions table and Feature Description section of the TPS61003DGS datasheet.

What is the purpose of the COMP pin on the TPS61003DGS, and what external components are required?

COMP is the error amplifier compensation node for the TPS61003DGS control loop. An external R-C-C network must be connected between COMP and GND to ensure stability and proper transient response. Typical values are specified in TI's application notes and evaluation module schematics. Omitting or misconfiguring this network risks oscillation or poor load regulation-verified in the Application and Implementation section of the TPS61003DGS documentation.

Does the TPS61003DGS support automatic restart after UVLO, or does it require an EN toggle?

The TPS61003DGS does not auto-restart after UVLO dropout. If VBAT falls below ~0.7 V while EN is tied high, the device shuts down and remains off-even if VBAT later recovers above 0.9 V. Recovery requires either a rising edge on EN (e.g., microcontroller reset pulse) or complete removal and reapplication of VBAT. This behavior is explicitly documented in Section 9.3.3 (Undervoltage Lockout) of the TPS61003DGS datasheet.