Texas Instruments UCC39412DG4

Overview

UCC39412DG4 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 output power with 1 V minimum start-up voltage, 0.5 Ω charge switch R_DS(on), and integrated adaptive current-mode control. It serves as the primary power management IC in ultra-low-voltage portable systems such as pagers and handheld medical devices.

For engineers reviewing the UCC39412DG4 datasheet, UCC39412DG4 pinout, UCC39412DG4 application, or UCC39412DG4 equivalent, key selection criteria include its guaranteed 1 V start-up under full load, dual-output capability (3.3 V main + 7 V gate-drive), programmable reset timing via CT pin, and SOIC-8 package compatibility with industrial temperature range (0°C to 70°C).

Technical Context

The UCC39412DG4 implements a multiplexed, priority-based dual-output architecture where the 3.3 V main output takes precedence over the 7 V VGD supply unless VGD falls below 6.3 V. Its adaptive current-mode control transitions between discontinuous and continuous conduction modes based on load, enabling high efficiency across 1 mA–60 mA output current range.

Startup is ensured at VIN ≥ 1 V under full load using internal bias derived from VIN, then sustained down to 0.5 V during operation. The IC integrates synchronous rectification (1.2 Ω R_DS(on)), anti-cross-conduction logic, and glitch-filtered active-low RESB reset output triggered at 90% of nominal VOUT.

Key Specifications

Pinout & Package

UCC39412DG4 is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.9 mm width, and 1.75 mm max height, rated for industrial temperature range (0°C to 70°C) and RoHS-compliant NIPDAU lead finish (MSL Level-2-260°C-1 year).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC29412DG4, UCC29412DG4 offers identical performance with extended temperature rating, while TPS61200DRCR simplifies design by omitting VGD and RESB-making it viable only when those features are unnecessary.

Availability

UCC39412DG4 is available at Aetrix Electronics and suitable for handheld medical monitors, pager power systems, low-power IoT sensors, and portable diagnostic tools requiring stable component supply across industrial temperature ranges and long-term battery life.

Supply support for UCC39412DG4 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The UCCx9411 family-including UCC39412DG4-is engineered specifically for ultra-low-voltage portable electronics powered by primary batteries, emphasizing start-up reliability, multi-rail integration, and minimal quiescent current.

FAQ

What is the minimum input voltage required for UCC39412DG4 to start up under full load?

The UCC39412DG4 guarantees startup under full 60 mA load at input voltages up to 1 V, with typical startup occurring at 0.9 V. Once operational, it continues functioning down to 0.5 V input, enabling maximum energy extraction from aging alkaline cells. This specification is validated per TI SLUS245E datasheet Section 6.3.

Does UCC39412DG4 support adjustable output voltage or is it fixed at 3.3 V?

UCC39412DG4 provides a fixed 3.3 V output; it does not support adjustable regulation. Unlike the UCC39411 (adjustable) or UCC39413 (5 V fixed), the UCC39412DG4 variant is factory-trimmed to deliver 3.3 V ±3.3% across 0–60 mA load and 1–3.2 V input, with no external feedback resistor network required.

How is the reset timeout period programmed on UCC39412DG4?

The reset timeout period on UCC39412DG4 is set by connecting an external capacitor between the CT pin and GND. The relationship is t_RP = C × 1.25 seconds, where C is in farads. For example, a 0.15 µF capacitor yields ~188 ms reset hold time. This allows precise synchronization with microcontroller clock stabilization requirements.

What is the purpose of the VGD pin on UCC39412DG4, and can it power external circuitry?

The VGD pin on UCC39412DG4 supplies a coarsely regulated ~7 V rail primarily for internal gate-drive circuitry. It can source up to 10 mA for external loads, but must not draw current below 2 V to ensure proper startup. Its voltage drops to 6.3 V minimum before triggering priority shift to VGD servicing-making it usable for low-current auxiliary functions like op-amp biasing.

Is UCC39412DG4 pin-compatible with other members of the UCCx9411 family?

Yes, UCC39412DG4 shares identical pinout and package (SOIC-8) with all UCCx9411 family members including UCC29412DG4, UCC39411DG4, and UCC39413DG4. However, functional differences exist: UCC39412DG4 uses SD/FB solely for shutdown (no FB function), while UCC39411DG4 requires resistive divider feedback on that same pin.