Texas Instruments TPS75100YFFR

Overview

TPS75100YFFR from Texas Instruments is a linear low-dropout (LDO) LED current source optimized for keypad and navigation pad backlighting in portable Li-ion battery-powered devices. It delivers regulated 3–10 mA per LED (factory-programmed) or up to 25 mA (with external resistor), with 2% LED-to-LED matching, 28-mV typical dropout voltage, and independent PWM brightness control per two-LED bank - enabling precise dual-bank dimming in space-constrained mobile handsets.

For engineers reviewing the TPS75100YFFR datasheet, TPS75100YFFR pinout, TPS75100YFFR application, or TPS75100YFFR equivalent, key selection considerations include its ultra-low dropout performance at 25 mA, factory-set current accuracy (±0.5% typ), absence of internal switching noise, wafer chip-scale package (DSBGA-9) footprint, and dual independent enable/PWM interface for bank-level brightness control.

Technical Context

The TPS75100YFFR implements four matched NMOS-based linear current sources arranged in two independent banks (A and B), each driving two LEDs in common-cathode topology. Current regulation relies on a precision 1.225-V internal reference and 420:1 current mirror ratio, supporting either factory-programmed default currents (3–10 mA in 1-mA steps) or user-defined values via external ISET resistor.

Each bank features an active-high enable input (ENA/ENB) accepting PWM signals down to 33-µs minimum on-time for analog-equivalent dimming; no internal clock or switching circuitry is used, eliminating EMI generation. The device operates across 2.7 V to 5.5 V input range and is fully specified from –40°C to +85°C junction temperature.

Key Specifications

Pinout & Package

TPS75100YFFR uses a 9-ball, 0.4-mm pitch wafer chip-scale package (DSBGA-9), measuring 1.208 mm × 1.208 mm, with bottom-side thermal pad for enhanced power dissipation in thin mobile form factors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75100YFFR, TPS75103YFFR offers lower quiescent current and reduced thermal dissipation at the cost of peak brightness, while TPS75105YFFR delivers higher baseline illumination without sacrificing matching or EMI performance - all three share identical layout, firmware interface, and reliability profile.

Availability

TPS75100YFFR is available at Aetrix Electronics and suitable for cellular handset backlighting, keypad illumination, and portable display LED driving requiring stable component supply, long-term lifecycle support, and wafer-level packaging for ultra-thin designs.

Supply support for TPS75100YFFR 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 technologies, with decades of expertise in precision analog ICs for portable and battery-powered systems.

The TPS7510x product line was designed specifically for low-power, EMI-sensitive LED backlighting in space-constrained mobile devices - emphasizing factory-trimmed accuracy, zero-switching-noise operation, and minimal external component count.

FAQ

What is the factory-programmed current setting for TPS75100YFFR?

The TPS75100YFFR is factory-programmed to deliver 0 mA per LED by default - meaning no current flows unless an external resistor is connected to the ISET pin. This zero-default configuration provides maximum flexibility for custom current settings and avoids unintended LED activation during power-up or test. When an external resistor is applied, TPS75100YFFR calculates output current using the formula I_LED = (1.225 V / R_SET) × 420.

Can TPS75100YFFR drive red and white LEDs simultaneously?

Yes, TPS75100YFFR can drive red (V_F ≈ 1.7 V) and white (V_F ≈ 3.0–3.6 V) LEDs simultaneously because it supports output voltages from 1.5 V to VIN − 28 mV. Its tight load regulation (<0.8%/V) ensures current remains stable across this wide forward-voltage range, and 2% LED-to-LED matching maintains consistent brightness regardless of color mix - making TPS75100YFFR suitable for multi-color indicator arrays.

Does TPS75100YFFR require output capacitors for stability?

No, TPS75100YFFR does not require output capacitors for stability. As a linear current source with no internal switching or feedback loop compensation needing external phase margin control, it operates stably with only standard input decoupling (e.g., 1 µF ceramic). Adding output capacitors is discouraged - they introduce unnecessary parasitic effects and may degrade transient response during PWM dimming, especially given the device's 33-µs minimum on-time requirement.

How does thermal shutdown work in TPS75100YFFR?

TPS75100YFFR incorporates integrated thermal shutdown that activates at 165°C junction temperature, disabling all current outputs until die temperature falls to 140°C (25°C hysteresis). This protection operates independently of input voltage or enable states and resets automatically without external intervention. During normal operation in a properly laid-out DSBGA-9 footprint with thermal pad soldered to PCB ground plane, TPS75100YFFR sustains 25 mA per channel continuously at +85°C ambient.

Is TPS75100YFFR pin-compatible with other TPS7510x variants?

Yes, TPS75100YFFR is fully pin-compatible with all members of the TPS7510x family in the YFF (DSBGA-9) package, including TPS75103YFFR and TPS75105YFFR. They share identical pin assignments, electrical characteristics, thermal metrics, and functional behavior - differing only in factory-programmed default current values. This allows direct substitution in existing layouts without PCB or firmware changes when adjusting baseline brightness requirements.