Texas Instruments UCC39413PW

Overview

UCC39413PW from Texas Instruments is a low-power synchronous boost converter IC optimized for single/dual alkaline battery operation, delivering 5 V / 200 mW output with adaptive current-mode control, 0.5 Ω integrated charge switch, 1.2 Ω synchronous rectifier, and programmable reset function via CT pin. It enables reliable microcontroller power-up in portable pagers and cell phones.

For engineers reviewing the UCC39413PW datasheet, UCC39413PW pinout, UCC39413PW application, or UCC39413PW equivalent, key selection criteria include its 5 V fixed output regulation (±2%), 0.5 V minimum operating input voltage, 6 µA shutdown supply current, and TSSOP-8 package compatibility with space-constrained battery-powered designs.

Technical Context

The UCC39413PW implements a multiplexed dual-output architecture that prioritizes the main 5 V output over the auxiliary 9.3 V gate-drive supply (VGD), switching between discontinuous and continuous conduction modes based on load demand. Its bang-bang control loop uses a 5.5 µs/VIN on-time and internal 1.25 V reference to regulate output with ±2% accuracy across 0–60 mA load.

Startup is guaranteed at 1 V input under full 60 mA load, and operation continues down to 0.5 V once running. The IC integrates anti-cross-conduction logic, glitch-suppressed reset generation, and adaptive current limiting with 50 ns delay-enabling stable 22 µH inductor-based designs without external compensation.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package: 3.0 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, gull-wing leads, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC39412PW, the UCC39413PW provides higher output voltage for 5 V logic while retaining identical shutdown behavior and reset programmability; versus TPS61200DRCR, it offers integrated VGD and RESB but trades off adjustability and ultra-low quiescent current for application-specific simplicity.

Availability

UCC39413PW is available at Aetrix Electronics and suitable for portable medical monitors, handheld communication devices, low-power IoT sensor nodes, and battery-powered consumer electronics requiring stable component supply across extended production lifecycles.

Supply support for UCC39413PW 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 ICs for battery-constrained applications.

The UCC3941x product line was designed specifically for ultra-low-voltage boost conversion in single/dual-cell alkaline, NiCd, and NiMH battery systems-prioritizing startup reliability, wide-load efficiency, and integrated system-level functions like reset generation.

FAQ

What is the minimum input voltage required for UCC39413PW to start up under full load?

The UCC39413PW guarantees startup under full 60 mA load at 1.0 V input voltage. Once operating, it continues regulation down to 0.5 V input. This ensures functional operation through deep battery discharge in alkaline-powered devices. The UCC39413PW achieves this via optimized low-V_GS internal MOSFETs and adaptive current sensing that remains accurate even at sub-1 V VIN.

How does the UCC39413PW generate its 5 V output with only a single inductor?

The UCC39413PW uses a time-multiplexed dual-output architecture: one inductor alternately services the main 5 V output (VOUT) and the auxiliary 9.3 V gate-drive supply (VGD). Priority logic ensures VOUT is serviced first unless VGD falls below 7.5 V. This eliminates need for second inductor while maintaining regulation accuracy and efficiency across both rails. The UCC39413PW's internal synchronous rectifier and charge switch enable this topology without external diodes.

Can the UCC39413PW's reset function be disabled or bypassed?

No-the RESB pin is an integral, non-disableable feature of the UCC39413PW. It asserts active-low whenever VOUT falls below 90% of nominal (i.e., 4.5 V), with built-in 60 µs delay and glitch filtering. To suppress reset assertion, external circuitry (e.g., a transistor gate) must hold RESB high-but this violates the intended safety function. The UCC39413PW's reset behavior is hardwired and cannot be configured via pins or registers.

What is the purpose of the VGD pin on the UCC39413PW, and what load can it support?

The VGD pin on the UCC39413PW provides a coarsely regulated 9.3 V supply primarily for driving the internal synchronous rectifier's gate. It supports up to 10 mA load but must not be loaded below 2 V to ensure proper startup. If VGD drops below 7.5 V, it gains priority over VOUT servicing. The UCC39413PW's VGD regulation is unregulated in the sense of tight tolerance-it's designed for internal switching, not external loads-and should not be used as a general-purpose 9 V rail.

Is the UCC39413PW pin-compatible with other members of the UCC3941x family?

Yes-the UCC39413PW shares identical TSSOP-8 pinout, electrical interface, and control logic with UCC39411PW and UCC39412PW. Only the output voltage (5 V vs. adjustable or 3.3 V) and VGD regulation level (9.3 V vs. 7.7 V) differ. This allows direct substitution in existing layouts when changing output voltage requirements, provided feedback network and CT/resistor values are verified for the new regulation point. The UCC39413PW maintains full functional compatibility across the family.