Texas Instruments TPS61140DRCR

Overview

TPS61140DRCR from Texas Instruments is a dual-output boost regulator IC designed for clamshell phone OLED/LCD display power management. It delivers up to 27 V on both voltage (VOUT) and current (IOUT) outputs, integrates a 0.7-A N-channel MOSFET and built-in power diode, and operates with PFM control for OLED supply and 1.2-MHz PWM for WLED backlight driving.

For engineers reviewing the TPS61140DRCR datasheet, TPS61140DRCR pinout, TPS61140DRCR application, or TPS61140DRCR equivalent, key selection considerations include its single-inductor dual-output architecture, individually programmable voltage/current regulation via external resistors, input-to-output isolation, short-circuit and overvoltage protection, and support for up to 30 kHz PWM dimming on the SELI pin.

Technical Context

The TPS61140DRCR uses a single inductor to generate two regulated outputs: a low-ripple LDO-based voltage output (VOUT) and a constant-current sink output (IOUT). Its feedback architecture dynamically selects between V(IOUT)–VOUT and IFB as the boost converter's regulation signal depending on load requirements in BOTH-ON mode.

It implements hybrid control: PFM for high-efficiency light-load operation when only VOUT is active, and fixed-frequency 1.2-MHz PWM when IOUT is enabled. The device includes built-in soft start (16-step current sink ramp), thermal shutdown (160°C), undervoltage lockout (1.65 V), and overvoltage protection (28 V for TPS61140).

Key Specifications

Pinout & Package

TPS61140DRCR is housed in a 10-pin, 3 mm × 3 mm QFN package with an exposed thermal pad soldered to analog ground for optimal power 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 display power applications.

Compared with TPS61140DRCR, TPS61141DRCR offers lower overvoltage protection for enhanced capacitor safety but reduced headroom for high-V_f LED strings; RT9397BF sacrifices dual-rail flexibility for higher switching frequency and simpler control, requiring separate OLED supply circuitry.

Availability

TPS61140DRCR is available at Aetrix Electronics and suitable for clamshell phone displays, portable medical monitors, and industrial HMIs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS61140DRCR 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 display power solutions.

The TPS61140DRCR belongs to TI's display power management product line, engineered specifically for dual-rail mobile display systems where space, efficiency, and integration are critical design constraints.

FAQ

What is the overvoltage protection threshold for TPS61140DRCR?

The TPS61140DRCR features a fixed overvoltage protection (OVP) threshold of 28 V, which disables the boost switch when the IOUT pin voltage exceeds this value. This protects the internal 30-V MOSFET and external 25-V output capacitors. The OVP hysteresis is 550 mV, ensuring stable re-enablement after fault clearance. This value is specific to the TPS61140DRCR variant and differs from the 22-V OVP of the pin-compatible TPS61141DRCR.

How is the output current programmed on TPS61140DRCR?

The TPS61140DRCR output current is programmed via an external resistor connected between the ISET pin (Pin 9) and GND. Using the formula I_OUT ≈ (1.229 V / R_SET) × K_ISET, where K_ISET = 900 (typical), a standard 80 kΩ resistor yields ~13.7 mA. The ISET pin voltage is internally regulated to 1.229 V, and IFB (Pin 10) is regulated to 330 mV to maintain current sink accuracy across temperature and load.

Can TPS61140DRCR drive both OLED and WLED outputs simultaneously?

Yes, the TPS61140DRCR supports simultaneous operation of both outputs: set SELV = H and SELI = H to enable VOUT and IOUT concurrently. In this mode, the boost converter regulates to the higher of (V(IOUT)–VOUT) or IFB voltage, automatically selecting feedback to minimize conduction losses in the LDO or current sink. Efficiency depends on the voltage difference between the two loads - smaller gaps yield higher overall efficiency.

What is the purpose of the IFB pin on TPS61140DRCR?

The IFB pin (Pin 10) serves as the feedback input for the current sink regulation loop. When SELI = H, the internal current sink regulates IFB to 330 mV, enabling precise constant-current control of the WLED string. In BOTH-ON mode, IFB acts as a secondary feedback path: if its voltage drops below 60 mV (V_{IFB_L}), the boost controller switches to IFB feedback to ensure current sink stability. Leakage current is <1 µA, preserving dimming linearity.

Does TPS61140DRCR require an external Schottky diode?

No, the TPS61140DRCR integrates a power diode with 1.0 V typical forward voltage at 0.7 A, eliminating the need for an external Schottky diode. This reduces BOM count, PCB area, and layout complexity. The internal diode is co-packaged with the 0.7-A MOSFET and optimized for the 1.2-MHz PWM and PFM operating modes. External diodes are neither recommended nor required in standard designs per the TI reference schematics.