Texas Instruments TPS61140DRCTG4

Overview

TPS61140DRCTG4 from Texas Instruments is a dual-output boost regulator IC designed for clamshell mobile phones with OLED sub-display and WLED LCD backlight. It delivers up to 27 V on both outputs, integrates a 0.7-A N-channel MOSFET and built-in power diode, operates with PFM control for OLED voltage output (up to 27 V) and 1.2-MHz PWM for WLED current output, and uses a single inductor to minimize board space.

For engineers reviewing the TPS61140DRCTG4 datasheet, TPS61140DRCTG4 pinout, TPS61140DRCTG4 application, or TPS61140DRCTG4 equivalent, key selection considerations include its dual-mode regulation (PFM for VOUT, PWM for IOUT), individual SELV/SELI enable control, 3×3 mm QFN-10 package with exposed thermal pad, 28-V overvoltage protection threshold, and soft-start behavior during mode transitions.

Technical Context

The TPS61140DRCTG4 implements a single-inductor dual-output architecture where a shared boost stage feeds both a low-dropout linear regulator (LDO) for VOUT and a low-side current sink for IOUT. Its feedback logic dynamically selects between V(IOUT)–VOUT and IFB voltage based on load requirements to minimize linear-stage losses.

It supports three operating modes-OLED-only (SELV=H, SELI=L, PFM), WLED-only (SELV=L, SELI=H, 1.2-MHz PWM), and simultaneous operation (SELV=H, SELI=H, PWM with priority-based feedback switching)-with dedicated undervoltage lockout (1.65 V), overvoltage protection (28 V), and thermal shutdown (160 °C).

Key Specifications

Pinout & Package

TPS61140DRCTG4 is housed in a 10-pin, 3 mm × 3 mm QFN package with an exposed thermal pad soldered to analog ground for thermal dissipation. Pin numbering follows top-view layout with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61140DRCTG4, TPS61141DRCT offers tighter overvoltage protection for cost-sensitive 20-V capacitor use, while RT8535GQW demands external circuitry for dual-output functionality-making TPS61140DRCTG4 the only single-chip solution supporting coordinated OLED+WLED operation with programmable mode control.

Availability

TPS61140DRCTG4 is available at Aetrix Electronics and suitable for clamshell phone design, OLED display biasing, and WLED backlight driver applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability screening.

Supply support for TPS61140DRCTG4 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 over 50 years of innovation in high-efficiency power conversion ICs.

The TPS61140DRCTG4 belongs to TI's portable lighting power management product line, engineered specifically for space-constrained dual-display mobile devices requiring high integration, low quiescent current, and robust protection features.

FAQ

What is the overvoltage protection (OVP) threshold for TPS61140DRCTG4?

The TPS61140DRCTG4 has a fixed overvoltage protection threshold of 28 V, which safeguards the internal 30-V MOSFET and external 25-V output capacitors. This value is specified in the Electrical Characteristics table and confirmed in the Ordering Information section of the SLVS624B datasheet. The OVP circuit disables switching immediately upon detecting output voltage exceeding 28 V and resumes operation once voltage falls below the hysteresis level of 550 mV.

Can TPS61140DRCTG4 drive both OLED and WLED outputs simultaneously?

Yes, the TPS61140DRCTG4 supports simultaneous operation when both SELV and SELI pins are driven high. In this mode, the boost converter dynamically selects feedback between V(IOUT)–VOUT and IFB to regulate the output requiring higher voltage, ensuring stable bias for OLED while delivering precise current to WLEDs. The device maintains coordination via internal logic that prioritizes V(IOUT)–VOUT unless IFB drops below its low threshold (60 mV), as detailed in the BOTH ON MODE section of the datasheet.

What is the recommended inductor value for TPS61140DRCTG4?

The datasheet specifies a 10 µH inductor as optimal for TPS61140DRCTG4, balancing ripple current (targeted at 30–40% of DC load), efficiency, and physical size. This value is validated in the Typical Application schematic and supported by equations in the APPLICATION INFORMATION section. Inductors must sustain saturation current above peak switch current (≥0.7 A) and exhibit ≤150 mΩ DC resistance to maintain >80% efficiency at full load.

How does PWM dimming work on the TPS61140DRCTG4 SELI pin?

PWM dimming on the TPS61140DRCTG4 is implemented by applying a logic-level PWM signal to the SELI pin: high enables the current sink, low disables it. The average output current scales linearly with duty cycle. Soft start is automatically disabled during PWM operation to improve dimming linearity, and frequencies up to 30 kHz avoid audible noise. The minimum off-time requirement (40 ms) ensures proper settling between pulses, as verified in Figure 12 and the WLED BRIGHTNESS DIMMING section.

Is TPS61140DRCTG4 pin-compatible with TPS61141DRCT?

Yes, TPS61140DRCTG4 is pin-compatible with TPS61141DRCT - both share identical 10-pin QFN-3×3 mm package, pinout, and terminal functions. The only functional difference is the overvoltage protection threshold: 28 V for TPS61140DRCTG4 versus 22 V for TPS61141DRCT. No PCB layout changes are required when substituting between these variants, provided the output capacitor voltage rating and LED string voltage align with the respective OVP level.