Texas Instruments TPS75100YFFT

Overview

TPS75100YFFT from Texas Instruments is a low-dropout linear LED current driver IC optimized for keypad and navigation pad backlighting in Li-ion–powered portable devices. It delivers matched constant current (±2% LED-to-LED) to four LEDs across two independent banks (D1A/D2A and D1B/D2B), supports PWM brightness control per bank, achieves 28 mV typical dropout at 5 mA, and operates from 2.7 V to 5.5 V input - enabling full functionality down to single-cell Li-ion battery cutoff.

For engineers reviewing the TPS75100YFFT datasheet, TPS75100YFFT pinout, TPS75100YFFT application, or TPS75100YFFT equivalent, key selection considerations include per-bank enable/PWM control, factory-programmable default current (3–10 mA), ultra-low EMI due to no internal switching, ISET-based current setting accuracy, and thermal performance in the 2.50 mm × 2.50 mm WSON-10 package.

Technical Context

The TPS75100YFFT implements four matched NMOS-based linear current sources arranged in two independently enabled banks, each driving two LEDs in common-cathode topology. Its LDO architecture uses an internal 1.225 V reference and 420:1 current mirror ratio to set output current via external resistor or factory EEPROM programming.

Each bank responds to active-high PWM signals on ENA/ENB with ≥33 µs minimum on-time for full-current settling; line regulation is 2.0 %/V and load regulation is 0.8 %/V, ensuring stable current delivery despite supply transients (e.g., RF transmit pulses) or varying LED forward voltages (1.5 V to 3.5 V).

Key Specifications

Pinout & Package

TPS75100YFFT is packaged in a 2.50 mm × 2.50 mm, 10-pin WSON (DSK) thermally enhanced leadless package with exposed thermal pad (Pin 5 = GND Pad). This package provides 65.3°C/W junction-to-ambient thermal resistance and supports high-density mobile PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75100YFFT, TPS75103YFFT offers lower quiescent current at default operation but requires higher PWM duty for equivalent brightness, while TPS75105YFFT delivers immediate mid-level illumination without external components - making it preferable for rapid prototyping and production variants targeting balanced performance.

Availability

TPS75100YFFT is available at Aetrix Electronics and suitable for cellular handset backlighting, smartphone navigation pad illumination, and portable device status indicator applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for TPS75100YFFT 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.

The TPS7510x product line was designed specifically for low-power, EMI-sensitive LED backlighting in battery-operated mobile devices - emphasizing matching accuracy, ultra-low dropout, and integrated PWM control to reduce system-level component count.

FAQ

What is the default LED current setting for TPS75100YFFT?

The TPS75100YFFT is factory-programmed with a default LED current of 10 mA per channel when the ISET pin is left open. This value is trimmed to ±0.5% accuracy using on-die EEPROM, eliminating the need for an external resistor in many applications. The TPS75100YFFT does not require configuration to achieve this baseline output - it activates immediately upon valid VIN and ENA/ENB assertion.

Can TPS75100YFFT drive LEDs with different forward voltages on the same IC?

Yes, the TPS75100YFFT supports mixed-color LEDs (e.g., red, green, blue) across its four outputs because its load regulation is specified at 0.8 %/V. As long as each LED's forward voltage stays within 1.5 V to 3.5 V - and the VIN–VF headroom remains above 100 mV - current matching remains within ±2%. This allows use of diverse LED types without per-channel compensation.

What is the minimum PWM on-time required for full-current operation of TPS75100YFFT?

The TPS75100YFFT requires a minimum PWM on-time of 33 µs to reach full programmed current on either bank. If both ENA and ENB transition simultaneously, this timing applies strictly. However, if one bank is already active, the second bank achieves full current in ~20–23 µs due to faster settling - a behavior confirmed in Figure 4 and Figure 5 of the SBVS080J datasheet.

Does TPS75100YFFT require external capacitors for stability?

No, the TPS75100YFFT is internally compensated and requires no external output capacitors. Only standard 0.1 µF ceramic decoupling at VIN is recommended. Adding capacitors to D1A/D2A/D1B/D2B outputs is discouraged - they degrade transient response, increase board area, and provide no stability benefit per TI's design validation and Figure 13 layout guidance.

How does thermal performance differ between TPS75100YFFT's WSON and WCSP packages?

The TPS75100YFFT in WSON-10 (YFFT) achieves 65.3°C/W RθJA, while the DSBGA-9 (YFF) version measures 101.6°C/W. This 36% improvement in thermal resistance makes the WSON variant better suited for sustained 25 mA operation in enclosed handheld enclosures. Both packages share identical electrical specs, but WSON's exposed thermal pad must be soldered to a dedicated PCB ground plane for optimal performance.