Texas Instruments TPS61061YZFR

Overview

TPS61061YZFR from Texas Instruments is a constant-current synchronous boost LED driver IC designed to power up to four white LEDs in series from a 2.7 V to 6 V input supply. It integrates overvoltage protection (18 V min), short-circuit protection, and delivers up to 400 mA switch current with 1 MHz fixed-frequency operation and 250 mV/500 mV selectable feedback voltage for optimized efficiency in portable backlighting applications.

For engineers reviewing the TPS61061YZFR datasheet, TPS61061YZFR pinout, TPS61061YZFR application, or TPS61061YZFR equivalent, key selection considerations include its NanoFree™ 8-ball DSBGA package, digital brightness control via ILED pin (5-bit DAC, 15.6 mV/step), PWM dimming support on EN pin (≤1 kHz), integrated 400-mA N-channel MOSFET, and OVP threshold specific to the TPS61061 variant.

Technical Context

The TPS61061YZFR employs peak-current-mode PWM control with a fixed 1 MHz switching frequency and internal loop compensation. Its synchronous rectification uses an integrated N-channel MOSFET (0.6–0.9 Ω R_DS(ON) at 3.6 V) and P-channel MOSFET (2.5–3.7 Ω R_DS(ON)) to minimize conduction loss.

It operates exclusively in continuous conduction mode (CCM), includes undervoltage lockout (1.65 V threshold, 50 mV hysteresis), thermal shutdown (160 °C trip, 15 °C hysteresis), and advanced short-circuit detection that limits precharge current to 95 mA at 3.6 V input when OUT is shorted to GND.

Key Specifications

Pinout & Package

TPS61061YZFR is housed in an 8-ball NanoFree™ (DSBGA) package measuring 1.446 mm × 1.446 mm, with bottom-side solder balls and no exposed thermal pad. The package is lead-free, RoHS-compliant, and optimized for ultra-compact PCB layouts in space-constrained mobile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61061DRBR, the TPS61061YZFR saves >75% board area and eliminates thermal pad layout complexity, while compared with TPS61062YZFR, it provides tighter OVP margin (18 V vs. 22.2 V) for 4-LED strings-reducing output capacitor voltage rating requirements and cost.

Availability

TPS61061YZFR is available at Aetrix Electronics and suitable for cellular phone keypad backlighting, digital still camera LCD backlighting, and PDA display backlighting requiring stable component supply across high-volume consumer electronics production cycles.

Supply support for TPS61061YZFR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal solutions for industrial, automotive, and consumer markets.

The TPS6106x product line was engineered specifically for space-constrained portable LED backlighting, integrating protection, efficiency optimization, and digital control into ultra-small packages for next-generation handheld devices.

FAQ

What is the overvoltage protection threshold for TPS61061YZFR?

The TPS61061YZFR has a minimum overvoltage protection (OVP) threshold of 18 V, with typical and maximum values of 18.5 V and 19.8 V respectively. This OVP level is factory-set and unique to the TPS61061 variant, enabling safe use of 25 V-rated ceramic output capacitors while protecting the internal 33 V-rated switch node from overvoltage stress during open-load or LED-string disconnect events.

How does digital brightness control work on TPS61061YZFR?

TPS61061YZFR implements digital brightness control via its ILED pin using an internal 5-bit DAC. When ILED is pulled high, V_FB is set to 250 mV; when grounded, V_FB is 500 mV. Pulses on ILED (low for 1–75 µs to increase, 180–300 µs to decrease) step V_FB in 15.6 mV increments between 250 mV and 500 mV, enabling 32 discrete LED current levels without continuous PWM generation or processor intervention.

What package type does TPS61061YZFR use and what are its dimensions?

TPS61061YZFR uses the NanoFree™ 8-ball DSBGA (Die Size Ball Grid Array) package, designated YZF. Its nominal body size is 1.446 mm × 1.446 mm with a ball pitch of 0.4 mm. This chip-scale package eliminates leads and mold compound, achieving the smallest possible footprint and height for ultra-thin portable electronics, and requires standard SMT assembly with Type 3 or finer solder paste.

Can TPS61061YZFR drive more than four LEDs?

No, TPS61061YZFR is specifically characterized and guaranteed to drive up to four white LEDs in series. While the boost topology could theoretically support higher voltages, the 18 V OVP threshold and internal current limit are optimized for 4-LED strings (typically ~14.3 V V_OUT). Driving five LEDs would exceed the OVP threshold under normal operation and is not supported-use TPS61062YZFR instead for 5-LED applications.

What is the recommended output capacitor value for TPS61061YZFR?

The minimum recommended output capacitor for TPS61061YZFR is 220 nF, using X5R or X7R dielectric ceramic types to maintain capacitance stability over temperature and DC bias. Values up to 4.7 µF are acceptable and reduce output voltage ripple, but 220 nF is sufficient for most keypad/backlight applications and aligns with the device's optimization for small-form-factor designs.