Renesas UPC2905BT1D-E1-AT

Overview

UPC2905BT1D-E1-AT from NEC Electronics is a three-terminal low dropout (LDO) voltage regulator delivering 5.0 V ±2% output at up to 1.0 A, featuring 0.38 V typical dropout voltage at 0.5 A, 1.8 mA typical quiescent current at zero load, and integrated thermal shutdown, overcurrent limiting, and inrush current protection. It serves as a primary power supply for logic circuits in consumer audio systems and LCD monitors requiring stable 5 V rail generation from marginal input sources.

For engineers reviewing the UPC2905BT1D-E1-AT datasheet, UPC2905BT1D-E1-AT pinout, UPC2905BT1D-E1-AT application, or UPC2905BT1D-E1-AT equivalent, this page delivers verified electrical specifications, TO-252 package terminal mapping, real-world application context for 5 V LDO selection, and two validated alternative parts with documented functional and parametric differences.

Technical Context

The UPC2905BT1D-E1-AT implements a bipolar-based error amplifier architecture with internal reference voltage, drive circuit, and saturation/thermal protection blocks. Its design targets low-noise, high-stability regulation under dynamic load conditions common in digital TV and printer subsystems.

It operates within −40°C to +85°C ambient temperature, supports input voltages from 6.0 V to 12.0 V, and maintains output voltage tolerance of ±2% across load (0–1 A), line (6–12 V), and temperature (0–125°C junction) variations - confirmed per μPC29xxB Series data sheet G17567EJ4V0DS.

Key Specifications

Pinout & Package

UPC2905BT1D-E1-AT uses the TO-252 (MP-3ZK) surface-mount package - a 4-pin variant with exposed thermal pad (Pin 4 = GND/FIN). Pin 2 is cut; Pins 2 and 4 are internally connected to common GND. This configuration provides enhanced thermal dissipation (R_th(J-C) = 12.5°C/W) versus SC-63 or SC-64 variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with UPC2905BT1D-E1-AT, TPS7A4700RGWR offers lower noise but adds design overhead, while LD1085V50TR delivers higher current at the cost of efficiency and protection features - making UPC2905BT1D-E1-AT optimal for balanced 5 V LDO needs in space- and cost-constrained consumer electronics.

Availability

UPC2905BT1D-E1-AT is available at Aetrix Electronics and suitable for LCD monitors, digital TV tuner modules, audio amplifiers, and printer subsystems requiring stable component supply with full RoHS compliance and tape-and-reel packaging (2500 pcs/reel).

Supply support for UPC2905BT1D-E1-AT 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

NEC Electronics Corporation (now part of Renesas Electronics) designed high-reliability analog ICs for consumer, industrial, and automotive markets, emphasizing robustness and manufacturability.

The μPC29xxB Series was developed specifically for low-voltage, high-current LDO applications in cost-sensitive consumer electronics - prioritizing dropout voltage, output accuracy, and integrated protection over programmability or ultra-low IQ.

FAQ

What is the maximum input voltage rating for the UPC2905BT1D-E1-AT?

The absolute maximum input voltage for UPC2905BT1D-E1-AT is +16.0 V. However, the recommended operating range is 6.0 V to 12.0 V per the datasheet's Recommended Operating Conditions table. Exceeding 12.0 V continuously may degrade long-term reliability despite being within absolute ratings, and operation above 16.0 V risks permanent damage to the UPC2905BT1D-E1-AT.

Does the UPC2905BT1D-E1-AT require external capacitors, and what values are specified?

Yes, UPC2905BT1D-E1-AT requires both input (C_IN) and output (C_OUT) capacitors. C_IN must be ≥0.1 µF ceramic, placed within 1–2 cm of the INPUT pin to prevent parasitic oscillation. C_OUT must be ≥10 µF low-impedance electrolytic, also placed close to the OUTPUT pin to improve load regulation and suppress oscillation - both values are explicitly mandated in the Typical Connection diagram of the UPC2905BT1D-E1-AT datasheet.

How does the thermal shutdown feature operate in the UPC2905BT1D-E1-AT?

The UPC2905BT1D-E1-AT incorporates an on-chip thermal shutdown circuit that disables the output when junction temperature exceeds +150°C. Once triggered, the device remains off until TJ falls below the hysteresis threshold (~135°C), at which point it automatically resumes regulation. This behavior is intrinsic to the UPC2905BT1D-E1-AT's internal block diagram and requires no external components.

Is the UPC2905BT1D-E1-AT pin-compatible with other packages in the μPC29xxB series?

No - UPC2905BT1D-E1-AT uses the TO-252 (MP-3ZK) package with 4 terminals (Pin 2 cut), while μPC2905BHF (TO-220), μPC2905BHB (SC-64), and μPC2905BT (SC-63) have different footprints, pin counts, and thermal pad configurations. PCB layout must be redesigned to accommodate the UPC2905BT1D-E1-AT's unique TO-252 footprint and GND-fin placement.

What is the short-circuit current limit of the UPC2905BT1D-E1-AT, and how is it implemented?

The UPC2905BT1D-E1-AT limits short-circuit current to 0.65 A typical at VIN = 6.5 V, as measured in the Electrical Characteristics table for μPC2905B. This is achieved via an on-chip overcurrent limiter that actively regulates output current during fault conditions - distinct from foldback or shutdown modes - allowing sustained safe operation without latch-up or damage to the UPC2905BT1D-E1-AT.