Texas Instruments UCC29411PW

Overview

UCC29411PW from Texas Instruments is a low-power synchronous boost converter IC optimized for single/dual alkaline battery operation, delivering 3.3 V at up to 200 mW from inputs as low as 0.8 V start-up and down to 0.5 V in operation. It integrates adaptive current-mode control, programmable reset timing via CT pin, and dual-output capability (main VOUT + auxiliary 7 V VGD supply) with 6 µA shutdown current and 0.5 Ω charge switch R_DS(on).

For engineers reviewing the UCC29411PW datasheet, UCC29411PW pinout, UCC29411PW application, or UCC29411PW equivalent, key selection criteria include its 0.8 V minimum start-up voltage, 3.3 V fixed output, TSSOP-8 package compatibility, and support for battery-powered microcontroller systems requiring reliable undervoltage reset and high efficiency across milliwatt-to-200-mW load range.

Technical Context

The UCC29411PW employs multiplexed priority-based switching between main output (VOUT) and gate-drive supply (VGD), where VOUT has highest priority unless VGD falls below 6.3 V. Its adaptive current-mode control transitions between discontinuous and continuous conduction modes based on load, optimizing efficiency from light loads (6 µA quiescent) to full 60 mA output.

Internal circuitry includes glitch-filtered active-low RESB reset output triggered at 90% of nominal VOUT, programmable reset period via CT capacitor (t_RP = C × 1.25 s), and integrated synchronous rectifier with 1.2 Ω R_DS(on) - all implemented in an 8-pin TSSOP package with validated pinout and thermal design for portable applications.

Key Specifications

Pinout & Package

UCC29411PW is housed in an 8-pin TSSOP (PW) package per JEDEC MO-153, with 0.65 mm lead pitch, 1.2 mm max height, and exposed pad not present. Pin 1 identifier is marked on top surface; seating plane defined per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-input-voltage boost converter applications.

Compared with TPS61200DRCR and MAX17222ELT+T, the UCC29411PW uniquely integrates VGD generation and RESB reset in a single TSSOP-8 package, eliminating external components required for gate drive and brownout protection in space-constrained battery systems.

Availability

UCC29411PW is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical devices, handheld scanners, and industrial asset tags requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for UCC29411PW 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-efficient power conversion.

The UCC29411PW belongs to TI's UCCx9411 family of low-input-voltage synchronous boost converters, designed specifically for single/dual-cell alkaline, NiCd, and NiMH battery systems in pagers, cell phones, and portable instrumentation where extended runtime and reliable reset behavior are essential.

FAQ

What is the minimum input voltage required for UCC29411PW to start up under full load?

The UCC29411PW guarantees start-up at ≤1.0 V input voltage with a full 60 mA load on the 3.3 V output. Once operating, it continues regulation down to 0.5 V input. This ensures maximum usable battery capacity from alkaline or NiMH cells, especially in applications where voltage sags under load would otherwise prevent startup. The UCC29411PW achieves this through optimized low-voltage biasing and adaptive current-mode control.

Does UCC29411PW provide a dedicated reset output, and how is its timing controlled?

Yes, UCC29411PW features an active-low open-drain RESB pin that asserts when VOUT falls below 90% of 3.3 V (i.e., 2.97 V). Reset timing is programmable via an external capacitor on the CT pin using the formula t_RP = C × 1.25 seconds - for example, a 0.15 µF capacitor yields ~188 ms hold time. This allows precise alignment with MCU clock stabilization requirements. The UCC29411PW implements internal glitch filtering to prevent false resets in noisy environments.

What is the purpose of the VGD pin on UCC29411PW, and what voltage does it deliver?

The VGD pin on UCC29411PW provides a coarsely regulated auxiliary supply (~7 V, ranging 6.3–7.7 V) primarily intended to drive internal power switches. It supports up to 10 mA load and maintains priority only when VOUT is stable and VGD drops below 6.3 V. Unlike the main VOUT rail, VGD is not precision-regulated but enables efficient synchronous rectification without external gate drivers. The UCC29411PW manages VGD and VOUT via internal multiplexing logic to avoid cross-conduction and optimize efficiency.

Can UCC29411PW operate from a single alkaline cell, and what output power is achievable?

Yes, UCC29411PW is explicitly optimized for single or dual alkaline cell operation, with guaranteed start-up at 1.0 V and operation down to 0.5 V. At input voltages ≥0.8 V, it delivers up to 200 mW at 3.3 V - sufficient for most ultra-low-power MCUs, sensors, and RF transceivers. This capability stems from its 0.5 Ω charge switch R_DS(on), 1.2 Ω synchronous rectifier, and adaptive current-mode control. The UCC29411PW sustains this performance across –40°C to 85°C ambient temperature.

How does the shutdown function work on UCC29411PW, and what is the SD/FB pin's dual role?

On UCC29411PW, the SD/FB pin serves dual functions: it accepts an active-low shutdown signal (pulling SD/FB ≤0.6 V disables switching and reduces supply current to 6 µA), and simultaneously provides feedback to regulate the 3.3 V output. For shutdown, a simple CMOS-level signal suffices; for feedback, TI specifies a minimum Thevenin impedance of 200 kΩ to ground. This dual-role design minimizes external components. The UCC29411PW integrates internal biasing to ensure stable regulation and fast recovery from shutdown without external compensation.