Texas Instruments TPS61055DRCT

Overview

TPS61055DRCT from Texas Instruments is a high-power white LED driver IC implementing a 2-MHz synchronous boost converter with integrated low-side current sink, delivering up to 500 mA flash current and 75 mA torch current in a 10-pin VSON (3.0 mm × 3.0 mm) package. It operates in four logic-controlled modes - shutdown, torch-only, torch+flash, and 5.0-V voltage regulation - and features 250-mV LED sense voltage for high efficiency in mobile camera flash applications.

For engineers reviewing the TPS61055DRCT datasheet, TPS61055DRCT pinout, TPS61055DRCT application, or TPS61055DRCT equivalent, key selection considerations include its 500 mA flash current rating, 820-ms integrated safety timer, zero-latency Tx-TOFF blanking input, 0.3 μA shutdown current, and compatibility with standard logic-level MODE0/MODE1 control signals.

Technical Context

The TPS61055DRCT employs current-mode PWM control with a fixed 2.0 MHz switching frequency, enabling use of compact 2.2-μH inductors and minimizing input ripple. Its dual-path architecture supports both constant-current LED driving (via 250-mV feedback at the LED pin) and regulated 5.0-V voltage boosting (with ±3% DC accuracy).

Mode selection is determined by the combination of MODE0 and MODE1 logic inputs, while FLASH_SYNC enables immediate transition to flash current level and Tx-TOFF provides instantaneous flash-to-torch reduction without affecting the safety timer. Internal protection includes open/shorted LED detection, thermal shutdown at 160°C, and undervoltage lockout at 2.4 V.

Key Specifications

Pinout & Package

TPS61055DRCT is housed in a thermally enhanced 10-pin VSON package (3.0 mm × 3.0 mm, 0.5-mm pitch) with exposed thermal pad connected internally to PGND. The package supports automated optical inspection and offers low thermal resistance (R_θJA = 48.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED driver applications.

Compared with TPS61055DRCT, TPS61054DRCT offers higher flash current but identical thermal and timing behavior, while RT8532DGQW trades feature richness for lower BOM cost and simpler layout - making TPS61055DRCT optimal for balanced performance, integration, and RF-aware mobile designs.

Availability

TPS61055DRCT is available at Aetrix Electronics and suitable for smartphone camera flash systems, portable audio amplifier power rails, and industrial LED status indicators requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS61055DRCT 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.

The TPS6105x product line was designed specifically for high-efficiency, logic-controlled white LED driving in space-constrained mobile devices - integrating flash synchronization, thermal safety, and multi-mode operation into a single 10-pin VSON package.

FAQ

What is the maximum flash current supported by the TPS61055DRCT?

The TPS61055DRCT supports a maximum flash current of 500 mA, configured via ILIM = 00 setting. This value is guaranteed across the full operating temperature range (–40°C to 85°C) and input voltage range (2.5 V to 6 V). The device enforces this limit using internal peak-current sensing on the SW node and includes thermal shutdown at 160°C to prevent sustained overload.

How does the TPS61055DRCT handle LED open-circuit faults?

When an LED open-circuit fault occurs, the TPS61055DRCT detects loss of current regulation and activates its secondary voltage-limiting loop. The output voltage is clamped to 6.0 V (typical), preventing uncontrolled voltage rise that could damage downstream circuitry. This behavior is confirmed in Section 9.4.2 of the SLUS760B datasheet and applies regardless of MODE0/MODE1 state.

Can the TPS61055DRCT be used as a general-purpose 5-V boost regulator?

Yes, the TPS61055DRCT can operate as a regulated 5.0-V boost converter when configured with MODE0 = 1 and MODE1 = 1. In this mode, it delivers ±3% DC output accuracy across 0–1 A load current and maintains >85% efficiency at 3.6-V input. The VOUT pin becomes the regulated output, and the LED pin is unused - allowing reuse of the same IC for auxiliary power rails.

What is the purpose of the Tx-TOFF pin on the TPS61055DRCT?

The Tx-TOFF pin on the TPS61055DRCT provides zero-latency flash blanking during cellular RF transmission. When pulled HIGH, it forces immediate reduction of LED current from flash level (500 mA) to torch level (75 mA) within 20 μs - suppressing conducted EMI without resetting the 820-ms safety timer. This function is critical for maintaining 3G/4G/LTE coexistence in compact mobile designs.

Does the TPS61055DRCT require external compensation components?

No, the TPS61055DRCT uses internal compensation and requires no external RC networks. Its current-mode control architecture with built-in ramp compensation ensures stability across all operating modes and input/output conditions. Only two external components are mandatory: a 2.2-μH power inductor and a 10-μF input capacitor - enabling total solution area under 25 mm² as specified in the datasheet.