Texas Instruments UCC39411PWTR

Overview

UCC39411PWTR from Texas Instruments is a low-power synchronous boost converter IC optimized for single/dual alkaline battery operation (0.5 V–3.2 V input), delivering 3.3 V at up to 200 mW from a single inductor. It integrates adaptive current-mode control, programmable reset output (RESB), shutdown via SD/FB pin, and dual-output capability (VOUT + VGD). Used in ultra-low-voltage portable electronics requiring high efficiency across milliwatt-to-hundred-milliwatt loads.

For engineers reviewing the UCC39411PWTR datasheet, UCC39411PWTR pinout, UCC39411PWTR application, or UCC39411PWTR equivalent, this page delivers verified technical context, exact package mapping (TSSOP-8), confirmed pin functions, real-world operating boundaries (0.5 V min VIN, 6 µA shutdown current), and validated alternative options - all extracted from TI's official SLUS245E datasheet and packaging documentation.

Technical Context

The UCC39411PWTR employs bang-bang (hysteretic) control with automatic transition between discontinuous and continuous conduction modes based on load demand. Its multiplexing logic prioritizes VOUT over VGD unless VGD falls below ~6.3 V, ensuring stable main output during gate-drive supply servicing.

Startup is guaranteed at 1 V input under full 60 mA load; operation continues down to 0.5 V once running. The integrated 0.5 Ω charge switch and 1.2 Ω synchronous rectifier minimize conduction loss, while CT-pin-programmable reset timing (e.g., 113–300 ms with 0.15 µF) enables precise microcontroller power-up sequencing.

Key Specifications

Pinout & Package

UCC39411PWTR is housed in an 8-pin TSSOP (PW) package per JEDEC MO-153, with 0.65 mm lead pitch and exposed thermal pad not connected internally. Pin 1 is marked by a dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC39411PWTR, UCC39412PWTR offers identical form-factor and performance with simplified fixed-output configuration, while TPS61200DRCR provides superior efficiency and lower VIN but lacks VGD and requires PCB redesign - making UCC39411PWTR uniquely suited for cost-sensitive, ultra-low-VIN dual-rail portable designs.

Availability

UCC39411PWTR is available at Aetrix Electronics and suitable for portable medical sensors, low-power wireless transceivers, energy-harvesting edge nodes, industrial handheld scanners, and battery-backed memory backup systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UCC39411PWTR 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 precision power conversion and low-power system design.

The UCC39411PWTR belongs to TI's UCCx9411 family of ultra-low-input-voltage synchronous boost converters, engineered specifically for single/dual-cell battery-powered portable electronics where maximizing runtime and minimizing component count are critical design objectives.

FAQ

What is the minimum input voltage required for UCC39411PWTR to start up under full load?

The UCC39411PWTR guarantees startup at 1 V input voltage under full 60 mA load, as specified in the absolute maximum ratings table of the SLUS245E datasheet. Once operational, it continues functioning down to 0.5 V input - a key advantage for deeply discharged alkaline or NiMH cells. This behavior is enabled by its adaptive current-mode control and low-quiescent-current architecture, which minimizes startup energy demand.

How does the UCC39411PWTR generate both VOUT and VGD from a single inductor?

The UCC39411PWTR uses time-multiplexed energy transfer: during each switching cycle, inductor energy is first directed to VOUT via the synchronous rectifier, then diverted to VGD through an internal flyback path when VGD falls below threshold. Priority logic ensures VOUT is serviced first unless VGD drops below ~6.3 V. This eliminates the need for a second inductor while maintaining independent regulation of both outputs.

Can the UCC39411PWTR be used with an adjustable output voltage, and how is it configured?

Yes - the UCC39411PWTR is the ADJ version of the family and uses the SD/FB pin as a feedback input. A resistive divider from VOUT to GND sets the output voltage according to VOUT = VREF × (1 + R1/R2), where VREF = 1.25 V (typ). The datasheet specifies a minimum Thevenin impedance of 200 kΩ to ground for stable operation, and shutdown is still achieved by pulling SD/FB low.

What is the function of the RESB pin on the UCC39411PWTR, and how is its timing controlled?

The RESB pin is an open-drain active-low reset output that asserts when VOUT falls below 90% of its nominal value (e.g., 3.0 V for 3.3 V output). Its deassertion delay after power-up is programmable via an external capacitor on the CT pin using the formula t_RP = C × 1.25 seconds (e.g., 0.15 µF yields ~188 ms). This ensures microcontrollers receive a clean, glitch-free reset signal aligned with clock stabilization.

Is the UCC39411PWTR pin-compatible with other members of the UCCx9411 family, such as UCC39412PWTR?

Yes - the UCC39411PWTR shares identical pinout, package (TSSOP-8), and electrical interface with UCC39412PWTR and UCC39413PWTR. The only functional difference lies in output configuration: UCC39411PWTR is adjustable (via SD/FB), UCC39412PWTR is fixed 3.3 V, and UCC39413PWTR is fixed 5 V. This allows direct substitution in layouts where output voltage requirements change, provided feedback network and shutdown logic are reviewed.