Texas Instruments TPS61141DRCR

Overview

TPS61141DRCR from Texas Instruments is a dual-output boost regulator IC designed for clamshell mobile phones with OLED sub-displays and WLED-backlit LCD main displays. It delivers up to 27 V on voltage output (VOUT) and regulates constant current up to 35 mA on IOUT, with integrated 0.7-A N-channel MOSFET and built-in power diode. Its PFM control for OLED supply and 1.2-MHz PWM for WLED driver enable high efficiency across load ranges.

For engineers reviewing the TPS61141DRCR datasheet, TPS61141DRCR pinout, TPS61141DRCR application, or TPS61141DRCR equivalent, key selection considerations include its 22-V overvoltage protection threshold, SELV/SELI dual-mode control logic, single-inductor dual-output architecture, and QFN-10 (3×3 mm) thermal-pad package optimized for space-constrained handheld power designs.

Technical Context

The TPS61141DRCR uses a single boost converter core to pre-regulate power for two independent outputs: a low-dropout linear regulator (LDO) for VOUT and a low-side current sink for IOUT. Feedback selection is dynamic - in BOTH-ON mode, it automatically chooses between V(IOUT)–VOUT and IFB voltage based on regulation headroom requirements and low-threshold hysteresis (VIFB_L = 60 mV).

Control modes are strictly determined by SELV/SELI logic states: PFM operation (high efficiency at light loads) when only VOUT is enabled (SELV = H, SELI = L); fixed-frequency 1.2-MHz PWM when only IOUT is active (SELV = L, SELI = H); and PWM with adaptive feedback when both outputs run simultaneously. Soft start is disabled during PWM dimming to preserve linearity.

Key Specifications

Pinout & Package

TPS61141DRCR is housed in a 10-pin, 3 × 3 mm QFN package with an exposed thermal pad that must be soldered to the PCB's analog ground plane for thermal management and electrical stability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output boost regulator applications.

Compared with TPS61141DRCR, TPS61140DRCR offers higher OVP headroom but identical functionality and layout compatibility, while RT9397BF trades integration and efficiency for higher current flexibility and external component control - making TPS61141DRCR optimal for compact, low-power dual-display handhelds.

Availability

TPS61141DRCR is available at Aetrix Electronics and suitable for clamshell phones, handheld medical displays, industrial portable terminals, and battery-powered dual-display consumer electronics requiring stable component supply across extended production lifecycles.

Supply support for TPS61141DRCR 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 and portable power solutions.

The TPS6114x family was engineered specifically for space-constrained mobile handsets requiring dual independent power rails - one for high-voltage OLED bias and one for precision WLED current control - using minimal external components.

FAQ

What is the overvoltage protection threshold for TPS61141DRCR?

The TPS61141DRCR has a fixed overvoltage protection (OVP) threshold of 22 V, with 440 mV hysteresis. This protects the internal 30-V MOSFET and external 25-V rated capacitors from damage during open-load or WLED disconnection events. The OVP circuit halts switching immediately upon exceeding 22 V and resumes only after the output falls below 21.56 V. This value distinguishes TPS61141DRCR from the TPS61140DRCR variant, which uses a 28-V threshold.

How does TPS61141DRCR handle simultaneous OLED and WLED operation?

When both SELV and SELI are high, TPS61141DRCR enters BOTH-ON mode and uses PWM control with adaptive feedback selection. It dynamically chooses between V(IOUT)–VOUT and IFB as the boost converter's feedback signal based on which requires higher output voltage headroom. If IFB drops below its low threshold (60 mV), feedback switches to IFB to maintain current sink regulation integrity - ensuring stable operation even with mismatched OLED and WLED forward voltages.

Can TPS61141DRCR drive more than four WLEDs in series?

Yes - TPS61141DRCR supports up to six WLEDs in series, provided the total forward voltage remains ≤22 V (its OVP limit). For example, six 3.6-V WLEDs (21.6 V total) are within specification. However, the regulated IOUT current remains capped at 35 mA regardless of string count. Efficiency decreases as V(IOUT)–VOUT increases, so optimal performance occurs when the boost output voltage is minimized - typically achieved with 4–5 WLEDs at 15–19 V.

What is the purpose of the IFB pin on TPS61141DRCR?

The IFB pin on TPS61141DRCR serves as the current feedback input for the low-side current sink regulating IOUT. It is internally regulated to 330 mV ±30 mV. In BOTH-ON mode, IFB also acts as a secondary boost feedback signal: if its voltage drops below 60 mV (VIFB_L), the controller switches feedback from V(IOUT)–VOUT to IFB to preserve current sink functionality. This dual-role design ensures robust regulation under varying load conditions without external compensation.

Does TPS61141DRCR require external compensation components?

No - TPS61141DRCR features fully internal compensation optimized for the recommended external components: 10-µH inductor, 4.7-µF input capacitor, and 1–4.7-µF output capacitors. The PWM control loop is factory-tuned for stability with standard ±20% inductor tolerance and typical ceramic capacitor ESR. No external RC networks or compensation pins are needed, simplifying layout and reducing BOM count compared to controller-based alternatives.