Texas Instruments TPS61046YFFT

Overview

TPS61046YFFT from Texas Instruments is a highly integrated 28-V boost DC-DC converter in a 0.80-mm × 1.20-mm WCSP package, designed for space-constrained PMOLED and sensor power applications. It operates from 1.8 V to 5.5 V input, delivers up to 28 V output, integrates a 30-V power switch and isolation FET, and achieves 85% efficiency at 3.6-V input/12-V output.

For engineers reviewing the TPS61046YFFT datasheet, TPS61046YFFT pinout, TPS61046YFFT application, or TPS61046YFFT equivalent, key selection considerations include its ultra-low 500-nA shutdown current, ±2% output voltage accuracy, true input-output disconnection during shutdown, 1.0-MHz switching frequency enabling miniature passives, and internal 10-ms soft start for inrush control.

Technical Context

The TPS61046YFFT uses current-mode PWM control with adaptive constant off-time and supports automatic transition between PWM and power-save (PFM) modes based on load. Its functional block includes an integrated 30-V NMOS power switch, low-side isolation FET, and power diode - eliminating external components while enabling true input-output disconnect.

It implements comprehensive protection: under-voltage lockout (UVLO) with 1.55-V falling threshold and 200-mV hysteresis, output over-voltage protection (OVP) at 29.2 V with 0.8-V hysteresis, output short-circuit limiting (<200 mA at VOUT = 0 V), and thermal shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

TPS61046YFFT is housed in a 6-ball, 0.80-mm × 1.20-mm WCSP (Wafer Chip Scale Package) with bottom-side solder balls. The package is lead-free, RoHS-compliant, and optimized for ultra-dense portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61046YFFT, TPS61042YFFT trades output voltage range and protection for lower cost, while MAX17222ELT+T offers similar specs in a legacy package with inferior integration - making TPS61046YFFT optimal for miniaturized, low-leakage, high-reliability boost applications.

Availability

TPS61046YFFT is available at Aetrix Electronics and suitable for PMOLED power supply, wearable sensor module, and portable medical equipment requiring stable component supply, long-term lifecycle support, and guaranteed WCSP packaging integrity.

Supply support for TPS61046YFFT 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 high-efficiency DC-DC conversion.

The TPS61046YFFT belongs to TI's ultra-small boost converter product line, engineered specifically for space- and power-constrained applications such as wearables, medical patches, and industrial sensors demanding high-voltage bias in sub-1-mm² footprints.

FAQ

What is the minimum input voltage required for TPS61046YFFT to start switching?

The TPS61046YFFT has an under-voltage lockout (UVLO) with a rising threshold of 1.75 V and falling threshold of 1.55 V. It begins switching once VIN rises above 1.75 V and remains enabled until VIN falls below 1.55 V. After initial startup, it can sustain operation down to 1.6 V, making it suitable for deeply discharged Li+ batteries. This behavior is confirmed in Section 7.5 of the SLVSCQ7 datasheet.

Can TPS61046YFFT be used to generate a fixed 12-V output without external resistors?

Yes. The TPS61046YFFT supports fixed 12-V output by connecting the FB pin directly to the VIN pin - activating its internal feedback reference. This configuration requires only three external components: one inductor and two ceramic capacitors (input and output). The output voltage accuracy is ±2% across –40°C to 125°C, as verified in the Electrical Characteristics table (VOUT_12V parameter).

Does TPS61046YFFT provide true input-to-output isolation during shutdown?

Yes. The TPS61046YFFT integrates a dedicated isolation MOSFET that disconnects VOUT from VIN when the EN pin is pulled low. In shutdown mode, input-to-output leakage is limited to <500 nA (max at TJ ≤ 60°C), enabling zero-load battery drain in always-on systems. This feature is explicitly documented in Sections 1 (Features), 8.1 (Overview), and 8.3.2 (Enable and Disable).

What protection features are built into TPS61046YFFT?

The TPS61046YFFT includes five hardware protections: (1) Under-voltage lockout (UVLO) with 200-mV hysteresis, (2) Output over-voltage protection (OVP) triggering at 29.2 V with 0.8-V hysteresis, (3) Output short-circuit limiting (<200 mA at VOUT = 0 V), (4) Thermal shutdown at 150°C with 20°C hysteresis, and (5) Internal current limiting (900 mA typical peak switch current). All are implemented in silicon without external components.

What is the recommended inductor value range for TPS61046YFFT?

The TPS61046YFFT is specified to operate with inductors from 1.0 µH to 22 µH. For most 12-V output applications with 50-mA load, 4.7 µH (e.g., TDK VLS4012-4R7M) or 10 µH (e.g., Sumida CDRH3D23/HP) are recommended. Inductor saturation current must exceed peak switch current (≥900 mA), and DCR should be minimized to preserve efficiency - values ≤200 mΩ are preferred per Section 9.2.2.2.