Texas Instruments TPS61100RGERG4

Overview

TPS61100RGERG4 from Texas Instruments is a dual-output, single-cell synchronous boost converter with integrated 120 mA LDO. It operates from 0.8 V to 3.3 V input, delivers up to 5.5 V adjustable boost output and supports programmable LDO output (0.9–3.6 V), achieving 95% peak efficiency and 65 µA total quiescent current. It enables battery-powered portable systems requiring two regulated rails - e.g., DSP core + I/O supply in PDAs or digital cameras.

For engineers reviewing the TPS61100RGERG4 datasheet, TPS61100RGERG4 pinout, TPS61100RGERG4 application, or TPS61100RGERG4 equivalent, key selection criteria include its dual-rail capability, ultra-low start-up voltage (0.85 V), auto-discharge function for microcontroller reset, low-EMI switch architecture, and QFN-24 package thermal performance.

Technical Context

The TPS61100RGERG4 implements a fixed-frequency (320–800 kHz) PWM-controlled synchronous rectifier using integrated N- and P-channel MOSFETs, with peak switch current limited to 1500 mA and on-resistance ≤300 mΩ for both switches. Its dual-stage architecture decouples boost and LDO control: the boost stage features power-good (PGOOD) signaling and skip-mode enable (SKIPEN), while the LDO stage accepts input from either VOUT or VBAT and is independently enabled via LDOEN.

It integrates multiple system-level functions: antiringing switch for EMI reduction, auto-discharge (400 Ω internal switch), dual open-drain low-battery outputs (LBO1/LBO2) with 400/450/500 mV thresholds, and undervoltage lockout at ~0.7 V. Thermal shutdown activates at 140°C with 20°C hysteresis, and all control logic references GND while power paths use separate PGND.

Key Specifications

Pinout & Package

TPS61100RGERG4 is housed in a thermally enhanced 24-pin QFN package (RGE), 4 mm × 4 mm × 0.8 mm, with exposed thermal pad (PGND-connected) for improved power dissipation in high-current boost operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61088RHLR and MAX8647ETE+, the TPS61100RGERG4 uniquely combines sub-1-V start-up, dual-threshold battery monitoring, auto-discharge, and load disconnect - making it optimal for ultra-low-power, safety-critical portable instrumentation where deterministic shutdown and battery longevity are essential.

Availability

TPS61100RGERG4 is available at Aetrix Electronics and suitable for handheld medical monitors, digital still cameras, PDAs with DSP audio playback, and industrial handheld scanners requiring stable component supply across long production lifecycles.

Supply support for TPS61100RGERG4 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 solutions, with decades of expertise in battery-powered system power architecture.

The TPS6110x product line was designed specifically for single- and dual-cell portable electronics needing dual regulated outputs, ultra-low input voltage operation, and integrated system supervision - targeting PDAs, digital cameras, medical handhelds, and industrial scanners.

FAQ

What is the minimum input voltage required to start up the TPS61100RGERG4?

The TPS61100RGERG4 has a typical start-up input voltage of 0.85 V at 66 Ω load and 3.3 V output. It remains operational down to 0.8 V once started, enabling use with deeply discharged NiMH or alkaline cells. This capability is confirmed in the Electrical Characteristics table under "Input voltage for start-up" and "Input voltage once started" parameters.

Does the TPS61100RGERG4 support adjustable output voltages for both boost and LDO stages?

Yes, the TPS61100RGERG4 supports adjustable boost output up to 5.5 V via external resistor divider on the FB pin (reference = 500 mV), and adjustable LDO output up to 3.3 V via resistor divider on LDOSENSE. Fixed-output variants exist (e.g., TPS61103), but the TPS61100RGERG4 is the adjustable version for both rails as specified in the Available Output Voltage Options table.

How does the auto-discharge function work on the TPS61100RGERG4, and how is it controlled?

The TPS61100RGERG4 integrates a 400 Ω internal switch between VOUT and GND that activates when ADEN is high and the device enters shutdown. This discharges output capacitors to prevent residual voltage from keeping downstream microcontrollers active. The discharge time depends on output capacitance - e.g., 100 µF discharges in ~40 ms. ADEN must be pulled high to enable; tying it to GND disables the function.

What is the purpose of the dual LBO outputs (LBO1 and LBO2) on the TPS61100RGERG4?

The dual open-drain LBO outputs provide three programmable low-battery thresholds (400 mV, 450 mV, 500 mV) based on the voltage applied to LBI. Their logic states encode battery health: e.g., LBO1=0/LBO2=0 indicates VBAT < 400 mV; LBO1=0/LBO2=1 indicates 450–500 mV. This enables precise battery state-of-charge reporting without external comparators or ADC resources.

Can the TPS61100RGERG4 operate with a single-cell Li-ion battery?

No - the TPS61100RGERG4 is not rated for Li-ion input. Its absolute maximum input voltage on VBAT is 3.6 V, and recommended operating range is 0.8–3.3 V. A single Li-ion cell ranges from 3.0–4.2 V, exceeding both limits. It is expressly designed for single/dual NiMH/NiCd or alkaline cells (0.8–3.3 V), as stated in the Description and Recommended Operating Conditions sections.