Texas Instruments TPS7A1408PYBKR

Overview

TPS7A1408PYBKR from Texas Instruments is a 1-A ultra-low-dropout linear regulator (LDO) designed for low-voltage, high-efficiency power delivery in space-constrained portable systems. It operates with input voltage as low as 0.7 V, delivers fixed 0.8 V output at ±1% accuracy over –40°C to +125°C, and achieves 70 mV max dropout at 1 A (YBK package). Its dual-rail architecture uses IN for main power path and BIAS for internal circuitry - enabling stable regulation when VIN is only 100 mV above VOUT.

For engineers reviewing the TPS7A1408PYBKR datasheet, TPS7A1408PYBKR pinout, TPS7A1408PYBKR application, or TPS7A1408PYBKR equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for battery-powered wearable and mobile SoC power rails requiring sub-1-V operation and fast load transient response.

Technical Context

The TPS7A1408PYBKR implements a dual-supply LDO architecture: the IN pin supplies the pass element while the BIAS pin powers the reference, error amplifier, and control circuitry - decoupling efficiency from input headroom constraints. This enables operation with VIN as low as VOUT + 100 mV while maintaining full specification compliance including 1% output accuracy and 80 dB PSRR at 1 kHz.

It features active output discharge via an internal pulldown resistor (36 Ω), global UVLO with independent thresholds on IN (603 mV typ.) and BIAS (1.42 V typ.), and hybrid foldback current limiting (ICL = 1.035–2.45 A, ISC = 600 mA). Thermal shutdown activates at 165°C with 25°C hysteresis.

Key Specifications

Pinout & Package

TPS7A1408PYBKR is packaged in a 0.71 mm × 1.16 mm, 6-bump WCSP (YBK) with bottom-side thermal pad electrically connected to GND. The package supports ultra-thin designs in wearables and compact mobile modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout LDO applications.

Compared with TPS7A1408PYBKR, TPS7A1601DGNR trades BIAS-enabled ultra-low VIN capability for simpler single-supply operation and higher minimum VIN, while NCP114AMX18T2G offers smaller footprint but fails to match output voltage, current, or accuracy - making neither a drop-in replacement, though both serve adjacent low-power LDO roles.

Availability

TPS7A1408PYBKR is available at Aetrix Electronics and suitable for camera modules, wireless earbuds, and smart watches requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance across production lots.

Supply support for TPS7A1408PYBKR 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 and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing reliability.

The TPS7A14 product line was engineered specifically for ultra-low-voltage, high-transient-performance power delivery in battery-powered portable electronics - addressing the need for efficient regulation at sub-1-V output levels with minimal PCB area.

FAQ

What is the minimum input voltage required for stable operation of the TPS7A1408PYBKR?

The TPS7A1408PYBKR supports stable regulation down to 0.7 V on the IN pin when paired with a valid BIAS supply (≥2.2 V or VOUT + 1.4 V). All specifications - including ±1% accuracy and 70 mV dropout - are guaranteed for VIN ≥ VOUT + 100 mV, i.e., ≥0.9 V for the 0.8 V TPS7A1408PYBKR variant. Operation below 0.7 V is not characterized or recommended.

Does the TPS7A1408PYBKR require external capacitors, and what are the minimum values?

Yes, the TPS7A1408PYBKR requires three external capacitors: ≥0.75 µF on IN, ≥0.1 µF on BIAS, and ≥2.2 µF on OUT. For best transient response, TI recommends ≥8 µF on OUT. All capacitors must be ceramic with X5R/X7R dielectric and placed as close as possible to their respective pins. The BIAS capacitor is not required for stability but is essential for PSRR and noise performance.

How does the BIAS pin function in the TPS7A1408PYBKR, and why is it necessary?

The BIAS pin powers the internal reference, error amplifier, and control circuitry independently of the IN pin, enabling the TPS7A1408PYBKR to regulate accurately even when VIN is only 100 mV above VOUT. Without BIAS, the device could not sustain regulation below ~1.1 V. BIAS must be ≥2.2 V or VOUT + 1.4 V (i.e., ≥2.2 V for TPS7A1408PYBKR's 0.8 V output) and is not used for power delivery to the load.

Is the TPS7A1408PYBKR pin-compatible with other variants in the TPS7A14 family?

Yes, all TPS7A14 variants - including TPS7A1408PYBKR - share identical 6-bump WCSP (YBK) pinout and footprint regardless of output voltage. The A1–C2 pin mapping (OUT, IN, SENSE, EN, GND, BIAS) is consistent across fixed-output versions from 0.5 V to 2.0 V, enabling design reuse and simplified BOM management for multi-rail systems.

What protection features are integrated into the TPS7A1408PYBKR?

The TPS7A1408PYBKR integrates thermal shutdown (165°C trip, 140°C reset), foldback current limiting (1.035–2.45 A ICL, 600 mA ISC), global UVLO (IN and BIAS monitored independently), and active output discharge (36 Ω pulldown). These features ensure robust operation during overload, overtemperature, input brownout, and system power-down sequences without external components.