Texas Instruments TPS61236PRWLT

Overview

TPS61236PRWLT from Texas Instruments is a synchronous boost DC-DC converter optimized for single-cell Li-Ion/Li-Polymer battery-powered portable devices, delivering up to 3.5 A output current at 97% peak efficiency, with programmable constant-current regulation (via external resistor on CC pin), 1-MHz switching frequency, and fixed 2.5 mm × 2.5 mm VQFN-9 package - used in USB Type-C power delivery and battery backup units.

For engineers reviewing the TPS61236PRWLT datasheet, TPS61236PRWLT pinout, TPS61236PRWLT application, or TPS61236PRWLT equivalent, key selection considerations include adjustable output voltage (2.9–5.5 V), valley-current-mode control architecture, true input-output disconnection in shutdown (<1 µA IQ), integrated 14-mΩ/14-mΩ power switches, and load-status indication via open-drain INACT pin.

Technical Context

The TPS61236PRWLT implements dual-loop regulation: a voltage feedback loop (using internal 1.244-V reference and FB pin) and a programmable constant-current loop (monitored via CC pin voltage proportional to IOUT). It operates in quasi-constant-on-time valley-current PWM mode under medium-to-heavy loads and transitions to PFM at light loads for ultra-low quiescent current (10 µA).

Its control architecture integrates soft-start with pre-charge phase (current-limited by ILIM_pre), cycle-by-cycle valley-current limiting (6.5–9.5 A), overvoltage protection (5.6–5.93 V), thermal shutdown (140°C), and true input-output isolation during shutdown - all within a 2.5-mm × 2.5-mm VQFN package with exposed thermal pad.

Key Specifications

Pinout & Package

TPS61236PRWLT uses a 2.5 mm × 2.5 mm VQFN-9 package with wettable flank leads and exposed thermal pad (PGND-connected) for enhanced thermal performance in high-current applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61236PRWLT, TPS61235PRWLT offers simpler integration for fixed-output systems but sacrifices flexibility, while MP28164GQ-Z provides alternate sourcing with reduced feature set and lower current capacity - making TPS61236PRWLT optimal for USB-C PD and intelligent power bank designs requiring programmable CC and system-aware load monitoring.

Availability

TPS61236PRWLT is available at Aetrix Electronics and suitable for USB Type-C power delivery, battery backup units, and portable tablet PCs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS61236PRWLT 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 and battery-powered system design.

The TPS6123x product line was designed specifically for high-current, high-efficiency boost conversion in space- and thermal-constrained portable electronics - emphasizing integrated power switches, dual-loop regulation, and intelligent load interface features like INACT.

FAQ

What is the maximum output current capability of the TPS61236PRWLT?

The TPS61236PRWLT delivers up to 3.5 A output current under typical conditions (3.3 V input to 5 V output) with up to 97% peak efficiency. Its internal valley-current limit is 6.5–9.5 A, but practical continuous output is constrained by thermal limits and PCB layout. The device maintains this current with <0.06%/A load regulation and supports programmable constant-current operation via the CC pin.

How does the TPS61236PRWLT implement constant-current regulation?

The TPS61236PRWLT implements constant-current regulation by monitoring the voltage at the CC pin, which is proportional to output current (VCC = IOUT × RCC / 100,000). When VCC exceeds the internal 1.244-V reference, the current loop activates and adjusts the inductor valley current to maintain constant IOUT. A capacitor in parallel with RCC stabilizes the loop and filters switching noise - essential for accurate current limiting in USB applications.

What is the purpose of the INACT pin on the TPS61236PRWLT?

The INACT pin on the TPS61236PRWLT is an open-drain output that pulls low when output current falls below 50 mA, indicating downstream load inactivity or disconnection. This signal enables system-level power management - for example, allowing a microcontroller in a power bank to enter deep sleep when no USB device is attached. The pin can be left floating or tied to AGND if unused.

Can the TPS61236PRWLT operate with a 2.5-V input voltage?

No - the TPS61236PRWLT has a minimum recommended input voltage of 2.3 V, but its operation depends on the target output voltage. Per datasheet Section 7.3, VIN must remain at least 0.6 V below VOUT for stable constant-voltage regulation. So for a 2.9-V output, VIN must not exceed 2.3 V; attempting 2.5-V input with 2.9-V output risks premature pass-through mode and unstable regulation. Always verify VIN ≤ (VOUT − 0.6 V) in design.

What package type and thermal characteristics does the TPS61236PRWLT use?

The TPS61236PRWLT uses a 2.5 mm × 2.5 mm VQFN-9 package (RWL) with exposed thermal pad connected to PGND. Its thermal metrics include RθJA = 28.7°C/W, RθJC(bottom) = 1.6°C/W, and ψJB = 10.8°C/W - enabling high-power operation with minimal external heatsinking. The package supports reflow soldering and is compatible with automated optical inspection (AOI) due to wettable flank leads.