Texas Instruments TPS75105YFFR

Overview

TPS75105YFFR from Texas Instruments is a low-dropout linear LED current driver with two independent 2-LED banks (D1A/D2A and D1B/D2B) in common-cathode topology, delivering up to 25 mA per LED with ±0.5% typical factory-set current accuracy, 28 mV typical dropout voltage at 5 mA, and PWM brightness control via ENA/ENB pins. It targets keypad and navigation pad backlighting in Li-ion–powered handheld devices.

For engineers reviewing the TPS75105YFFR datasheet, TPS75105YFFR pinout, TPS75105YFFR application, or TPS75105YFFR equivalent, key selection considerations include per-bank PWM dimming capability, factory-programmable default current (5 mA for TPS75105), ultra-low EMI due to absence of internal switching, 9-ball DSBGA (YFF) package footprint, and compatibility with single-cell battery supplies down to 2.7 V.

Technical Context

The TPS75105YFFR implements four matched NMOS-based linear current sources-two per bank-with shared reference current generation and 420:1 current mirroring ratio. Its architecture eliminates internal switching, ensuring zero switching noise and simplifying EMI-sensitive layouts.

Each bank operates independently via active-high enable pins (ENA/ENB), supporting both on/off control and PWM dimming with ≥33 µs minimum pulse width. Current matching across all four channels is maintained concurrently, with ≤2% variation at 25°C and ≤5% over –40°C to +85°C in the YFF package.

Key Specifications

Pinout & Package

TPS75105YFFR uses a 9-ball, 0.4-mm pitch wafer chip-scale package (DSBGA), measuring 1.208 mm × 1.208 mm, optimized for space-constrained mobile front-end lighting modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75105YFFR, TPS75105DSKR offers superior thermal dissipation in high-power backlighting, while LM3644YFQR adds digital configurability at the cost of increased software overhead and loss of plug-and-play factory current setting.

Availability

TPS75105YFFR is available at Aetrix Electronics and suitable for keypad backlighting, navigation pad lighting, and cellular handset display frame illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant DSBGA packaging.

Supply support for TPS75105YFFR 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 solutions, with leadership in power management, signal chain, and high-reliability interface technologies.

The TPS7510x product line was designed specifically for low-power, EMI-sensitive LED backlighting in portable consumer electronics, emphasizing minimal external components, factory-trimmed accuracy, and ultra-compact wafer-level packaging.

FAQ

What is the factory-set LED current for TPS75105YFFR?

The TPS75105YFFR is factory-programmed to deliver 5 mA per LED channel with ±0.5% typical accuracy when the ISET pin is left open. This eliminates the need for an external resistor and ensures consistent brightness across all four outputs without calibration. The TPS75105YFFR variant is part of the TPS7510x family where suffix '05' explicitly denotes the 5 mA default configuration.

Can TPS75105YFFR drive LEDs with different forward voltages on the same bank?

Yes, TPS75105YFFR supports mixed-color LEDs (e.g., red and green) on the same bank because its load regulation is 0.8%/V - meaning output current remains stable despite LED forward voltage variations from 1.5 V to VIN – 0.1 V. This allows D1A and D2A to drive a 1.7 V red LED and a 3.3 V white LED simultaneously while maintaining matched current and brightness.

What is the minimum PWM pulse width supported by TPS75105YFFR?

The TPS75105YFFR requires a minimum on-time of 33 µs for reliable current settling. Pulses shorter than this cause reduced output current due to insufficient time for the internal current source to reach target level. This constraint defines the practical lower limit for PWM dimming frequency - e.g., at 10% duty cycle, maximum frequency is ~3 kHz; at 1% duty cycle, it drops to ~300 Hz.

Does TPS75105YFFR require external capacitors for stability?

No, the TPS75105YFFR is internally compensated and does not require external output capacitors. Only standard 0.1 µF ceramic decoupling at VIN is recommended. Adding capacitors to D1A/D2A/D1B/D2B outputs is discouraged as it degrades transient response and may cause instability during PWM transitions - a key advantage enabling clean, EMI-free operation in RF-sensitive designs.

How does thermal shutdown work on TPS75105YFFR?

The TPS75105YFFR integrates a thermal sensor that triggers shutdown at 165°C junction temperature, halting all current output until junction temperature falls to 140°C, at which point operation resumes automatically. This hysteresis prevents oscillation near trip point. During shutdown, supply current drops to ≤1 µA, preserving battery life. The YFF package's RθJA of 101.6°C/W means 100 mW of dissipation raises junction temperature by ~10°C above ambient.