Texas Instruments TPS61106PW

Overview

TPS61106PW from Texas Instruments is a dual-output, single-cell synchronous boost converter with integrated 120 mA LDO. It delivers fixed 3.3 V boost output and fixed 1.8 V LDO output, operates from 0.8 V to 3.3 V input, achieves up to 95% efficiency, and includes auto-discharge, power-good signaling, and low-battery detection. It powers portable systems requiring two regulated rails from one alkaline/NiMH cell - such as digital still cameras and PDAs.

For engineers reviewing the TPS61106PW datasheet, TPS61106PW pinout, TPS61106PW application, or TPS61106PW equivalent, key selection criteria include its dual-rail capability (3.3 V + 1.8 V), 20-pin TSSOP package, 1500 mA peak switch current limit, 65 µA quiescent current, and integrated low-battery comparator with dual open-drain outputs (LBO1/LBO2).

Technical Context

The TPS61106PW implements a fixed-frequency PWM boost controller with synchronous rectification using integrated N- and P-channel MOSFETs, enabling 95% peak efficiency and eliminating external Schottky diodes. Its dual-ground architecture (GND and PGND) isolates control logic from high-current paths.

It integrates two independent regulation stages: a primary boost converter with adjustable or fixed 3.3 V output and an auxiliary LDO delivering fixed 1.8 V from either the boost output or battery input. The device supports programmable low-battery thresholds (400/450/500 mV) via LBI resistor divider and provides auto-discharge (400 Ω internal switch) and power-good (PGOOD) signaling for system sequencing.

Key Specifications

Pinout & Package

TPS61106PW is housed in a 20-pin TSSOP (PW) package with 0.65 mm pitch, thermally enhanced for portable applications. Pin 1 is VBAT; pins 11 and 19 are PGND and VOUT respectively; GND (pin 10) and PGND (pin 11) must be connected at a single point near pin 10.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61103PW and MAX17065ETE+, the TPS61106PW offers factory-trimmed 1.8 V LDO output, integrated dual-threshold battery monitoring, and auto-discharge - reducing design effort and component count for portable medical and imaging devices requiring predictable, maintenance-free power sequencing.

Availability

TPS61106PW is available at Aetrix Electronics and suitable for digital still cameras, PDAs, internet audio players, and portable medical monitors requiring stable component supply across extended production lifecycles.

Supply support for TPS61106PW 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-powered system solutions.

The TPS6110x family was designed specifically for ultra-low-input-voltage, dual-rail portable electronics - delivering high efficiency, small solution size, and integrated system features like battery supervision and power sequencing.

FAQ

What is the fixed output voltage configuration of the TPS61106PW?

The TPS61106PW provides a fixed 3.3 V output from its boost converter stage and a fixed 1.8 V output from its integrated LDO stage. These voltages are factory-programmed and require no external feedback resistors, simplifying layout and reducing BOM count. This configuration is confirmed in the "AVAILABLE OUTPUT VOLTAGE OPTIONS" table of the SLVS411B datasheet, where TPS61106PW is explicitly listed with DC/DC = 3.3 V and LDO = 1.8 V.

Does the TPS61106PW support automatic discharge of output capacitors during shutdown?

Yes, the TPS61106PW includes an integrated auto-discharge function enabled via the ADEN pin. When ADEN is pulled high, a 400 Ω internal switch connects VOUT to GND after shutdown, actively draining stored charge. This prevents residual voltage from keeping downstream logic active - a critical feature for reliable microcontroller reset. The function is disabled when ADEN is grounded, as documented in the "AUTO DISCHARGE" section of the datasheet.

What package type and pin count does the TPS61106PW use?

The TPS61106PW uses a 20-pin TSSOP package (package code PW), with 0.65 mm lead pitch and exposed thermal pad. This is distinct from the QFN-24 (RGE) variant used by TPS61106RGE. The pinout is fully documented in the "PW PACKAGE (TOP VIEW)" diagram and "Terminal Functions" table of the SLVS411B datasheet, confirming pin 1 = VBAT, pin 10 = GND, pin 11 = PGND, and pin 19 = VOUT.

How does the low-battery detection work on the TPS61106PW?

The TPS61106PW implements a programmable low-battery detector using the LBI input and dual open-drain outputs LBO1 and LBO2. Three internal thresholds (400 mV, 450 mV, 500 mV) generate four discrete output states, allowing graduated system responses. For example, at LBI = 1.23 V, LBO1 goes low (indicating ≤450 mV scaled) while LBO2 remains high - enabling tiered warnings. The LBI voltage is set by an external resistor divider, as detailed in the "LOW BATTERY DETECTOR CIRCUIT" section.

What is the maximum output current capability of the TPS61106PW's LDO stage?

The TPS61106PW's integrated LDO delivers up to 120 mA when the input voltage (LDOIN) is ≥1.8 V, and up to 80 mA when LDOIN is <1.8 V. This is specified in the "ELECTRICAL CHARACTERISTICS" table under "Io(LDO) Output current". The LDO maintains ±3% total accuracy across load and line variations, with a dropout voltage of 300 mV at 120 mA - enabling stable 1.8 V regulation even as battery voltage declines.