Texas Instruments TPS61150DRCR

Overview

TPS61150DRCR from Texas Instruments is a dual-output, single-inductor boost WLED driver IC designed for independent current regulation of two white LED strings in portable displays. It operates from 2.5 V to 6 V input, delivers up to 27 V output per channel, integrates a 0.7-A N-channel MOSFET and built-in power diode, and supports PWM dimming up to 30 kHz - enabling high-efficiency backlighting for clamshell phone sub- and main-displays.

For engineers reviewing the TPS61150DRCR datasheet, TPS61150DRCR pinout, TPS61150DRCR application, or TPS61150DRCR equivalent, key selection considerations include its 1.2-MHz fixed-frequency PWM control, dual independent ISET/IFB current programming, OVP threshold of 28 V (TPS61150-specific), thermal shutdown at 160°C, and VSON-10 package with exposed thermal pad for compact, thermally robust layout.

Technical Context

The TPS61150DRCR uses a current-mode PWM boost controller with adaptive feedback headroom: it dynamically regulates the higher-voltage IFB pin (IFB1 or IFB2) to 330 mV while maintaining sufficient voltage headroom across both low-side current sinks. Its 1.2-MHz switching frequency minimizes output ripple and avoids audible noise, and the integrated 0.9-Ω (typ) MOSFET + 1-V forward-drop diode enables self-contained operation without external power devices.

Each output is independently enabled via SEL1/SEL2 logic inputs with internal 300–700 kΩ pulldown resistors; simultaneous enable yields dual-string operation, while staggered enable supports multiplexed PWM dimming. Overvoltage protection triggers at 28 V (TPS61150-specific), with 550-mV hysteresis, and undervoltage lockout disables all circuitry below 1.65 V (typ) VIN.

Key Specifications

Pinout & Package

TPS61150DRCR is housed in a 3.00 mm × 3.00 mm VSON-10 package with exposed thermal pad (pin 11), optimized for space-constrained portable PCBs and requiring solder connection of the thermal pad to analog ground for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output WLED driver applications.

Compared with TPS61150DRCR, TPS61151DRCR offers lower OVP for tighter voltage margin applications but identical functionality, while RT9397BZSP requires external diode support and lacks thermal pad optimization - making TPS61150DRCR the preferred choice for compact, thermally demanding, or high-OVP-margin designs.

Availability

TPS61150DRCR is available at Aetrix Electronics and suitable for sub-display backlighting, main-display backlighting, and keypad illumination applications requiring stable component supply, long-term production continuity, and automotive-qualified thermal performance.

Supply support for TPS61150DRCR 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 LED lighting control.

The TPS6115x product line was engineered specifically for space- and efficiency-critical portable display backlighting, integrating dual current sinks, boost regulation, and advanced dimming control into a single VSON package to replace multi-chip solutions.

FAQ

What is the overvoltage protection (OVP) threshold for TPS61150DRCR?

The TPS61150DRCR has a fixed overvoltage protection threshold of 28 V, which is specific to the TPS61150 variant (TPS61151DRCR uses 22 V). This threshold prevents damage to the internal 30-V MOSFET and external 25-V output capacitors during open-circuit LED conditions. The OVP hysteresis is 550 mV, ensuring stable re-enablement once the output voltage drops below 27.45 V. This value is factory-trimmed and not user-adjustable.

How does TPS61150DRCR regulate current for two independent LED strings?

TPS61150DRCR uses two dedicated low-side current sinks controlled by IFB1 and IFB2 pins, each regulated to 330 mV (typ) via external ISET1/ISET2 resistors. The boost converter dynamically adjusts IOUT voltage to satisfy the higher forward voltage string first, then maintains regulation by monitoring the IFB pin with greater voltage drop. This adaptive feedback ensures accurate current matching (±6%) even with mismatched LED counts or V_F variations between strings.

Can TPS61150DRCR drive more than 7 WLEDs per string?

Yes - TPS61150DRCR supports up to 27 V output per channel, enabling up to 8–9 standard 3.2-V WLEDs in series per string (e.g., 8 × 3.2 V = 25.6 V). When both strings are active, total LED count can reach 14 (e.g., 7+7), provided the combined power demand stays within the 0.7-A switch limit and 83% efficiency envelope. Layout must ensure adequate thermal dissipation via the exposed pad, especially at high ambient temperatures.

What is the minimum PWM dimming frequency supported by TPS61150DRCR?

TPS61150DRCR supports PWM dimming down to DC (0 Hz) for analog-like control, but practical minimum frequency is dictated by human perception - typically ≥100 Hz to avoid visible flicker. The device's soft-start disable feature during PWM ensures linear dimming response, and its 30-kHz maximum frequency places modulation safely above the audible range (20 Hz–20 kHz), eliminating inductor or capacitor buzz in sensitive audio environments.

Does TPS61150DRCR require external compensation components?

No - TPS61150DRCR features fully internal loop compensation optimized for the standard 10-μH inductor and 1-μF input/output capacitors shown in the typical application circuit. No external RC networks or compensation pins are needed. The current-mode control architecture provides inherent stability across operating conditions, and TI specifies that the internal compensation remains effective for inductor values within ±20% tolerance and DCR ≤300 mΩ.