Texas Instruments TPS61055YZGR

Overview

TPS61055YZGR from Texas Instruments is a high-power white LED driver IC featuring a 2-MHz synchronous boost converter with integrated current-sink regulation, 500-mA flash current capability, 75-mA torch current, and 250-mV LED sense voltage for high efficiency. It operates in four logic-controlled modes including flash, torch, shutdown, and 5-V voltage regulation-designed for smartphone camera LED flash systems requiring fast FLASH_SYNC-triggered turn-on and Tx-TOFF blanking.

For engineers reviewing the TPS61055YZGR datasheet, TPS61055YZGR pinout, TPS61055YZGR application, or TPS61055YZGR equivalent, key selection considerations include its 12-pin DSBGA (1.96 mm × 1.46 mm) package, 820-ms integrated safety timer, zero-latency TX-masking, open/short LED protection, and compatibility with Li-ion battery input (2.5–6 V).

Technical Context

The TPS61055YZGR implements a current-mode PWM control architecture with a 2-MHz fixed-frequency oscillator and internal ramp compensation to ensure stable operation above 50% duty cycle. Its dual-path power stage integrates an NMOS switch and synchronous NMOS rectifier, enabling continuous-conduction mode for low-noise performance and minimized switch ringing.

It supports both constant-current LED driving (via 250-mV feedback at LED pin) and constant-voltage regulation (5.0 V ±3%), selected via MODE0/MODE1 logic inputs. Flash synchronization is achieved through level-sensitive FLASH_SYNC with immediate current-level switching, while Tx-TOFF provides zero-latency flash blanking without affecting the safety timer duration.

Key Specifications

Pinout & Package

TPS61055YZGR uses a 12-pin DSBGA (Die Size Ball Grid Array) package with 0.4-mm pitch, body size 1.96 mm × 1.46 mm, and thermal pad internally connected to PGND. The package is optimized for minimal PCB area (<25 mm² total solution) and high thermal performance (R_θJB = 35.0°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61054YZGR, the TPS61055YZGR offers lower flash current and reduced thermal stress in compact layouts; compared with TPS61055DRCR, it delivers superior thermal performance in ultra-dense mobile PCBs despite identical functional behavior.

Availability

TPS61055YZGR is available at Aetrix Electronics and suitable for smartphone camera flash systems, portable audio power supplies, low-power torch lighting, and RF-coordinated illumination applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS61055YZGR 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 specializing in analog, embedded processing, and digital signal processing technologies, with leadership in power management ICs for portable electronics.

The TPS6105x product line was designed specifically for high-efficiency, space-constrained white LED driving in mobile imaging systems-integrating flash control, safety timing, and multi-mode regulation into a single chip.

FAQ

What is the maximum flash current supported by the TPS61055YZGR?

The TPS61055YZGR supports a factory-configured maximum flash current of 500 mA, corresponding to ILIM = 00 setting per the device options table. This is distinct from the TPS61054YZGR variant, which supports 700 mA (ILIM = 01). The current limit is enforced by internal sensing and cannot be adjusted externally without changing the part number.

Does the TPS61055YZGR require external components for basic operation?

Yes, the TPS61055YZGR requires at minimum an input capacitor (≥10 μF), output capacitor (≥3 μF), and 2.2-μH boost inductor for functional operation. These passive components form the core energy transfer and filtering network. No external current-setting resistors or compensation networks are needed-the device's 250-mV LED sense reference and internal compensation eliminate such dependencies.

How does the FLASH_SYNC pin function in the TPS61055YZGR?

The FLASH_SYNC pin on the TPS61055YZGR is a level-sensitive input that selects between torch (LOW) and flash (HIGH) current levels. When driven HIGH (to VIN), it immediately commands the device to regulate LED current at 500 mA; when LOW (GND), regulation reverts to 75 mA. The internal 820-ms safety timer starts on the rising edge and terminates the flash pulse regardless of FLASH_SYNC state after timeout.

Can the TPS61055YZGR drive multiple LEDs in series?

No, the TPS61055YZGR is designed exclusively for single-white-LED operation. Its LED pin regulates current based on a fixed 250-mV sense threshold and lacks the headroom or control architecture to manage series strings. Attempting to drive multiple LEDs would exceed the 5.5-V maximum output voltage rating in current-regulation mode and violate the specified V_LED range (0.25–2.0 V).

What thermal management provisions exist for the TPS61055YZGR in its DSBGA package?

TPS61055YZGR's 12-pin DSBGA package includes an exposed thermal pad internally connected to PGND. For effective thermal dissipation, this pad must be soldered to a dedicated PCB copper pour tied to the system ground plane. With proper layout, the device achieves R_θJB = 35.0°C/W, enabling sustained 500-mA flash operation in thermally constrained mobile enclosures without exceeding 125°C junction temperature.