Texas Instruments TPS61103PWR

Overview

TPS61103PWR from Texas Instruments is a dual-output, single-cell synchronous boost converter with integrated 120 mA LDO. It delivers a fixed 3.3 V boost output and adjustable LDO output, operates from 0.8 V input, achieves 95% peak efficiency, and features load disconnect during shutdown - enabling reliable power management in battery-powered portable electronics such as digital still cameras and PDAs.

For engineers reviewing the TPS61103PWR datasheet, TPS61103PWR pinout, TPS61103PWR application, or TPS61103PWR equivalent, key selection considerations include its dual-rail capability (3.3 V + programmable LDO), ultra-low 65 µA quiescent current, auto-discharge function for microcontroller reset assurance, and TSSOP-20 package compatibility with space-constrained designs.

Technical Context

The TPS61103PWR implements a fixed-frequency (320–800 kHz) PWM-controlled synchronous rectifier using integrated N-channel and P-channel MOSFETs to achieve 95% efficiency. Its dual-stage architecture separates the boost converter (with 1500 mA peak switch current limit and 500 mV feedback reference) from an independently enabled LDO stage (120 mA, ±3% accuracy, 300 mV dropout at 120 mA).

Control logic includes dedicated EN/ENPB enable inputs, SKIPEN for power-save mode activation, ADEN for auto-discharge control, and dual open-drain LBO outputs with user-programmable thresholds (400/450/500 mV) referenced to LBI - all coordinated with overtemperature protection (140°C trip) and undervoltage lockout (~0.7 V).

Key Specifications

Pinout & Package

The TPS61103PWR is housed in a 20-pin TSSOP (PW) package with exposed thermal pad (package code PW), measuring 6.5 mm × 4.4 mm × 1.2 mm, optimized for compact portable PCB layouts and thermal dissipation in battery-operated systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61103PWR, TPS61222DRCT reduces solution size but increases component count and removes battery supervision, while MAX17065ETA+ lowers quiescent current significantly yet sacrifices LDO flexibility and safety features like auto-discharge - making TPS61103PWR optimal for cost-sensitive, feature-complete dual-rail portable designs.

Availability

TPS61103PWR is available at Aetrix Electronics and suitable for digital still cameras, PDAs, internet audio players, and handheld medical monitors requiring stable component supply across extended production lifecycles.

Supply support for TPS61103PWR 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 ICs, with decades of expertise in battery-efficient power conversion.

The TPS6110x product line was designed specifically for single- and dual-cell battery-powered portable electronics needing dual regulated rails, ultra-low IQ, and robust battery supervision - targeting applications where runtime, reliability, and integration density are critical.

FAQ

What is the fixed boost output voltage of the TPS61103PWR?

The TPS61103PWR provides a fixed 3.3 V boost output voltage - no external feedback resistors required. This is confirmed in the "AVAILABLE OUTPUT VOLTAGE OPTIONS" table of the datasheet, where TPS61103PW/RGE is explicitly listed with "3.3 V" for the DC/DC output and "Adjustable" for the LDO output. The fixed 3.3 V rail simplifies design and improves stability versus adjustable versions.

Does the TPS61103PWR include an integrated LDO, and what is its output capability?

Yes, the TPS61103PWR integrates a 120 mA low-dropout regulator with adjustable output (0.9–3.6 V). Its LDO stage accepts input from either VOUT or VBAT, features ±3% output accuracy, and maintains 300 mV dropout at full 120 mA load. The LDO is independently enabled via the LDOEN pin and uses the LDOSENSE pin for feedback - allowing precise regulation of a second system rail without external components.

How does the auto-discharge function work on the TPS61103PWR, and when is it activated?

The TPS61103PWR's auto-discharge function activates when the ADEN pin is driven high and the device enters shutdown (EN = low). An internal 400 Ω switch connects VOUT to GND, discharging output capacitors to prevent unintended microcontroller wake-up or memory retention. This behavior is documented in the "AUTO DISCHARGE" section and electrical characteristics table (auto-discharge switch resistance = 400 Ω), and is especially valuable in systems requiring deterministic power-down states.

What package type and pin count does the TPS61103PWR use?

The TPS61103PWR uses a 20-pin TSSOP package (package code PW), with dimensions 6.5 mm × 4.4 mm × 1.2 mm and thermal pad. Pinout is verified from the "PW PACKAGE (TOP VIEW)" diagram and "Terminal Functions" table, which lists 20 signal pins including VBAT, EN, ADEN, VOUT, LDOIN, LDOOUT, PGOOD, GND, and PGND. The "R" suffix denotes tape-and-reel packaging (2000 units/reel).

What is the minimum input voltage required for the TPS61103PWR to start up and maintain operation?

The TPS61103PWR starts up with as little as 0.85 V (typical) at VBAT under load (RL ≥ 66 Ω, VOUT = 3.3 V), and continues operating down to 0.8 V. Its undervoltage lockout disables operation below ~0.7 V to prevent malfunction. These values are specified in the "ELECTRICAL CHARACTERISTICS" table under "Input voltage for start-up" and "Input voltage once started", confirming suitability for deeply discharged single-cell alkaline or NiMH batteries.