Texas Instruments TPS61089RNRT

Overview

TPS61089RNRT from Texas Instruments is a fully-integrated synchronous boost converter with 7-A continuous switch current, 19-mΩ low-side and 27-mΩ high-side MOSFETs, supporting 2.7–12-V input and 4.5–12.6-V output. It delivers >18 W from single- or dual-cell Li-ion batteries and targets portable power applications requiring compact, high-efficiency DC-DC conversion.

For engineers reviewing the TPS61089RNRT datasheet, TPS61089RNRT pinout, TPS61089RNRT application, or TPS61089RNRT equivalent, key selection criteria include its PFM light-load mode (vs. forced PWM in TPS610891RNR), 200 kHz–2.2 MHz adjustable switching frequency, 4-ms soft start, 13.2-V overvoltage protection, and 2.0 mm × 2.5 mm VQFN HotRod™ package with thermal pad.

Technical Context

The TPS61089RNRT uses adaptive constant off-time peak current control to deliver fast line/load transient response with minimal output capacitance. Its PFM operation at light load improves efficiency down to 1 mA while maintaining <1% output voltage deviation above nominal setpoint.

It integrates undervoltage lockout (2.7-V rising threshold, 200-mV hysteresis), cycle-by-cycle overcurrent protection via resistor-programmable ILIM pin (127 kΩ sets 8-A typical limit), and thermal shutdown at 150°C with 20°C hysteresis - all implemented without external components beyond RILIM, RFSW, and feedback divider.

Key Specifications

Pinout & Package

TPS61089RNRT is housed in a 2.0-mm × 2.5-mm, 11-pin VQFN package with exposed thermal pad (RNR suffix). The package supports high-power density and efficient PCB heat dissipation via bottom-side copper connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61089RNRT, TPS610891RNR offers identical performance except for forced PWM light-load behavior - making it a drop-in alternative where frequency stability matters more than efficiency. MP28164GQ-Z provides lower-cost integration but lacks critical protections and current capability, requiring additional design effort to match TPS61089RNRT's robustness.

Availability

TPS61089RNRT is available at Aetrix Electronics and suitable for Bluetooth speaker power supplies, quick-charge power banks, and portable POS terminals requiring stable component supply, long-term lifecycle support, and production-ready qualification.

Supply support for TPS61089RNRT 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 ICs, with decades of expertise in high-efficiency DC-DC conversion.

The TPS61089x family was designed specifically for space-constrained portable electronics needing high-output-voltage boost capability from single- or dual-cell batteries - emphasizing integration, protection, and ease of layout.

FAQ

What is the primary function of the ILIM pin on the TPS61089RNRT?

The ILIM pin on the TPS61089RNRT sets the peak switch current limit via an external resistor to ground. With a 127-kΩ resistor, it configures an 8-A typical limit; values from 100 kΩ to 357 kΩ adjust the limit between 10 A and 3 A. This feature enables safe operation under pulsed loads without requiring external current-sense circuitry, and is essential for matching inductor saturation ratings in the TPS61089RNRT design.

Does the TPS61089RNRT support adjustable output voltage, and how is it configured?

Yes, the TPS61089RNRT supports resistor-programmable output voltage from 4.5 V to 12.6 V using an external feedback divider connected to the FB pin. The internal 1.212-V reference determines the ratio: R1 = R2 × (V_OUT − 1.212)/1.212. A typical 17.4-kΩ R2 with 127-kΩ R1 sets 9 V. Accuracy remains within ±1% across temperature and load when using 1% resistors and proper PCB layout.

How does the TPS61089RNRT differ from the TPS610891RNR in operational behavior?

The TPS61089RNRT operates in PFM mode at light load to maximize efficiency, while the TPS610891RNR maintains forced PWM operation regardless of load - ensuring constant switching frequency. Both share identical pinout, package, input/output ranges, and protection features. The choice depends on whether system priority is battery life (TPS61089RNRT) or EMI/noise control (TPS610891RNR).

What thermal management considerations apply to the TPS61089RNRT in a 2-layer PCB design?

The TPS61089RNRT has a junction-to-board thermal resistance (R_θJB) of 9.6°C/W and requires direct thermal connection of its exposed pad to ≥2 cm² of inner/outer copper pour. On a 2-layer board, use ≥8 thermal vias (0.3-mm diameter) under the pad connected to solid ground plane. Without adequate copper, junction temperature may exceed 125°C at 2-A load - triggering thermal shutdown. The R_θJA of 53.4°C/W assumes standard JEDEC test conditions, not real-world layouts.

Can the TPS61089RNRT be used with input voltages above 5.5 V, and what are the limits?

Yes, the TPS61089RNRT supports input voltages up to 12 V per its absolute maximum rating and recommended operating conditions. Its internal UVLO activates at 2.7 V (rising) and releases at 2.5 V (falling), ensuring reliable startup from partially discharged batteries. Operation at 12-V input is valid for applications like dual-cell Li-ion (8.4-V fully charged) or 9-V battery backup systems - provided output voltage is set ≤12.6 V and thermal design accommodates higher power dissipation.