Texas Instruments TPS61059DRCRG4

Overview

TPS61059DRCRG4 from Texas Instruments is a synchronous boost converter with integrated down-mode operation, designed as a high-power white LED driver for single-cell Li-ion battery systems. It delivers up to 800 mA LED current from 2.7 V–5.5 V input, features 650 kHz fixed-frequency PWM control, 1500 mA switch current limit, and 80% peak efficiency at 500 mA output. It is used in smartphone camera flash modules requiring precise current regulation and low shutdown current.

For engineers reviewing the TPS61059DRCRG4 datasheet, TPS61059DRCRG4 pinout, TPS61059DRCRG4 application, or TPS61059DRCRG4 equivalent, key selection criteria include its 1500 mA peak switch current rating, dual-mode (boost/down) operation, open/shorted LED protection, thermal shutdown at 140°C, and compatibility with 3 mm × 3 mm QFN-10 PowerPAD™ packaging for compact mobile designs.

Technical Context

The TPS61059DRCRG4 implements a fixed-frequency, multiple feedforward controller topology that monitors input voltage, output voltage, and NMOS switch voltage drop to directly adjust duty cycle-bypassing slow error-amplifier loop latency. Its synchronous rectification uses integrated N-channel and P-channel MOSFETs with typical rDS(on) of 260 mΩ (SWN) and 290 mΩ (SWP), enabling high-efficiency power conversion without external Schottky diodes.

It supports two ground domains (GND for logic/control, PGND for power switching) to prevent ground shift under high-current transients. During shutdown (EN = GND), an internal circuit disconnects the cathode of the PMOS backgate diode, fully isolating the battery from the LED load and limiting shutdown current to 100 nA typical-critical for battery longevity in portable devices.

Key Specifications

Pinout & Package

TPS61059DRCRG4 is housed in a thermally enhanced 10-pin QFN package (3 mm × 3 mm, DRC), with exposed PowerPAD™ soldered to PGND for optimal thermal dissipation (ΘJA = 48.7 °C/W). The package is RoHS-compliant and moisture-sensitive level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61059DRCRG4, TPS61058DRCRG4 offers pin-compatible scaling down to 500 mA drive capability, while RT9397BF demands added protection circuitry and lacks seamless boost-to-buck transition-making TPS61059DRCRG4 the optimal choice for compact, high-reliability mobile flash systems.

Availability

TPS61059DRCRG4 is available at Aetrix Electronics and suitable for smartphone camera modules, tablet torch subsystems, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS61059DRCRG4 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 LED driver innovation.

The TPS6105x family was engineered specifically for space-constrained, battery-powered imaging systems-delivering high-current LED regulation with integrated protection, minimal external components, and thermal robustness in sub-3 mm² packages.

FAQ

What is the maximum continuous LED current supported by the TPS61059DRCRG4?

The TPS61059DRCRG4 supports up to 800 mA continuous LED current when operated from a 3.3 V input, enabled by its 1500 mA peak switch current limit and thermal design margin. This rating assumes proper PCB layout with PowerPAD™ soldered to PGND, ambient temperature ≤40°C, and adequate airflow. At higher temperatures or with reduced copper area, derating applies per the 21 mW/°C thermal derating factor.

How does the TPS61059DRCRG4 handle input voltages exceeding the LED forward voltage?

The TPS61059DRCRG4 automatically transitions from boost to down-conversion mode when input voltage approaches or exceeds the required output voltage to sustain LED current. In down mode, it regulates by adjusting the PMOS switch's conduction resistance-maintaining constant current without external components. This eliminates the need for a separate buck stage while preserving efficiency above ~3.8 V input.

Can the TPS61059DRCRG4 be used without the IOK pin connected?

Yes, the TPS61059DRCRG4 operates correctly with IOK left unconnected (open-drain output floating), but system-level sequencing-such as enabling camera sensor after LED readiness-will not be possible. Leaving IOK unconnected forfeits the pre-charge completion signal and removes a key diagnostic indicator for startup validation in production test.

What is the purpose of the dual ground pins (GND and PGND) on the TPS61059DRCRG4?

GND (Pins 5, 7) serves as the reference for logic-level signals (EN, FB, IOK), while PGND (Pin 10) carries high-pulsed switching currents from the NMOS source. Separating these grounds prevents noise coupling into sensitive control circuits. They must connect at a single point near the IC-typically at Pin 5-to avoid ground loops and ensure stable regulation and accurate current sensing.

Does the TPS61059DRCRG4 require an external compensation network?

Yes, the TPS61059DRCRG4 requires an external RC compensation network (R1 = 22 kΩ, C3 = 1 nF COG ceramic) connected between FB and GND to ensure loop stability across operating conditions. Omitting this network causes oscillation, excessive output ripple, or failure to regulate-especially under load transients or low input voltage. Layout proximity to FB and GND pins is critical for effectiveness.