Texas Instruments TPS61098DSER

Overview

TPS61098DSER from Texas Instruments is an ultra-low quiescent current synchronous boost converter with integrated LDO, designed for single-cell battery-powered systems. It delivers 4.3 V main output and 3.1 V LDO output in Active mode, starts up at 0.7 V input, supports automatic pass-through, and consumes only 300 nA in Low Power mode - enabling multi-year operation in BLE tags and wearable sensors.

For engineers reviewing the TPS61098DSER datasheet, TPS61098DSER pinout, TPS61098DSER application, or TPS61098DSER equivalent, this device is selected for ultra-low-power dual-rail power management where battery life, cold-start capability below 1 V, and seamless transition between boost and pass-through modes are critical design requirements.

Technical Context

The TPS61098DSER implements a hysteretic synchronous boost controller with integrated LDO, operating in two distinct modes controlled by the MODE pin: Active mode enables both VMAIN (4.3 V) and VSUB (3.1 V) outputs with enhanced transient response; Low Power mode disables the LDO while maintaining regulated VMAIN (2.2 V) at 300-nA IQ. Its automatic pass-through function activates when VIN exceeds 4.4 V (rising), bypassing switching to improve efficiency and reduce noise.

It uses a 6-pin WSON package with internal power switches (low-side and rectifier FETs), supports 0.7–4.5 V input, and integrates protection features including overtemperature shutdown (150 °C) and hysteresis (25 °C). The LDO provides 3.1 V ±3% output with 100-mV dropout at 50 mA and 40-dB PSRR at 1 kHz.

Key Specifications

Pinout & Package

TPS61098DSER is housed in a 1.5-mm × 1.5-mm, 6-pin WSON package (DSE) with wettable flanks, optimized for space-constrained wearables and IoT edge nodes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output boost-LDO applications.

Compared with TPS61098DSER, TPS610987DSER adds active VSUB discharge without altering quiescent current or voltage setpoints, while TPS610981DSER lowers VMAIN to 3.3 V and includes discharge - making both better suited for systems requiring rail sequencing or bus isolation during sleep, but not direct drop-in replacements due to output voltage and discharge behavior differences.

Availability

TPS61098DSER is available at Aetrix Electronics and suitable for smart remote control, BLE tag, wearable health monitor, single-coin cell, and single-alkaline-cell applications requiring stable component supply across extended production lifecycles.

Supply support for TPS61098DSER 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 decades of expertise in power management ICs for battery-operated systems.

The TPS61098x family was engineered specifically for ultra-low-power, single-cell battery applications - prioritizing nanoscale quiescent current, cold-start capability, and integrated dual-rail flexibility to eliminate discrete power components in space- and energy-constrained designs.

FAQ

What is the minimum input voltage required for TPS61098DSER to start up and regulate?

The TPS61098DSER starts up and establishes regulation at 0.7 V input voltage under load conditions ≥3 kΩ. This enables reliable operation from nearly depleted coin cells or alkaline batteries, supporting applications like long-life remote controls and disposable medical sensors where battery voltage drops below 1 V during end-of-life.

How does the MODE pin control power states in TPS61098DSER?

The MODE pin selects between Active mode (logic high ≥1.2 V) - enabling both VMAIN (4.3 V) and VSUB (3.1 V) outputs - and Low Power mode (logic low ≤0.4 V) - disabling the LDO while retaining VMAIN at 2.2 V and reducing IQ to 300 nA. The pin must be actively driven; floating is prohibited per datasheet specification.

Does TPS61098DSER support automatic pass-through, and what is its threshold?

Yes, TPS61098DSER supports automatic pass-through: when VIN rises above 4.4 V, the boost converter stops switching and directly connects VIN to VMAIN, improving efficiency and eliminating switching noise. The hysteresis is 0.1 V, so the mode reverts to boost when VIN falls below 4.3 V.

What is the maximum output current capability of the TPS61098DSER LDO?

The TPS61098DSER LDO delivers up to 50 mA with a typical dropout voltage of 60 mV at that load. Its output is specified as 3.1 V ±3% (2.94–3.16 V) and maintains regulation across –40°C to 125°C junction temperature, making it suitable for powering RF transceivers or precision analog sensors in compact wearables.

Is the TPS61098DSER pin-compatible with other devices in the TPS61098x family?

Yes, all TPS61098x variants - including TPS61098DSER, TPS610981DSER, TPS610982DSER, and TPS610987DSER - share identical 6-pin WSON (DSE) packaging and pinout. However, output voltages, LDO discharge capability, and pass-through thresholds differ, so electrical validation is required before substitution.