Infineon Technologies TLE4299GNTMA1

Overview

TLE4299GNTMA1 from Infineon Technologies is a monolithic 5-V fixed-output linear voltage regulator with PNP-based low-drop architecture, delivering up to 150 mA output current across 5.5 V–45 V input range, ±2% output tolerance, and typical 65 µA quiescent current - designed for automotive microcontroller power supply under continuous battery standby conditions.

For engineers reviewing the TLE4299GNTMA1 datasheet, TLE4299GNTMA1 pinout, TLE4299GNTMA1 application, or TLE4299GNTMA1 equivalent, key selection criteria include its inhibit-controlled ultra-low-off-state current (<1 µA), adjustable reset threshold (3.5 V–4.6 V), early-warning sense function (SI/SO), reset delay via external capacitor, and operation down to V_I = 1 V.

Technical Context

The TLE4299GNTMA1 implements a PNP-pass transistor topology enabling dropout as low as 0.5 V at 150 mA, with internal bandgap reference and precision error amplifier ensuring ±2% output regulation. It integrates dual supervision functions: a reset output (RO) with user-adjustable threshold and delay, and a sense output (SO) triggered by SI voltage crossing programmable hysteresis thresholds.

Its inhibit control (INH pin on GM variant) enables system-level power gating, reducing quiescent current to <1 µA when inactive. Overtemperature, short-circuit, and reverse-polarity protections are embedded, and all functions operate across –40 °C to +150 °C junction temperature range per AEC-Q100 stress requirements.

Key Specifications

Pinout & Package

Package: P-DSO-8-3 (8-pin exposed-pad SOIC, RoHS-compliant, thermal pad connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5-V automotive LDO regulator applications.

Compared with TLE4299GNTMA1, TLE4269G offers identical footprint and basic regulation but omits inhibit and adjustable reset, while TLV73350PDBVR trades automotive robustness and supervision for lower quiescent current and cost in non-automotive use cases.

Availability

TLE4299GNTMA1 is available at Aetrix Electronics and suitable for Engine Control Units, Body Control Modules, Transmission Control Units, and ADAS camera ECUs requiring stable component supply under AEC-Q100-qualified conditions and long-term automotive lifecycle support.

Supply support for TLE4299GNTMA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and security solutions, with global manufacturing and qualification infrastructure.

The TLE4299 belongs to Infineon's TLE automotive linear regulator product line, engineered specifically for fault-tolerant, always-on microcontroller power delivery in harsh automotive environments including engine compartments and chassis modules.

FAQ

What is the purpose of the SI and SO pins on the TLE4299GNTMA1?

The SI (Sense Input) pin monitors an external voltage source - such as battery or another rail - and triggers the SO (Sense Output) open-collector pin to go low when that voltage falls below a user-defined threshold (V_SI,low). This provides early warning of impending undervoltage before the main 5-V output (Q) drops, allowing the MCU to initiate controlled shutdown or diagnostics. The hysteresis between V_SI,low and V_SI,high prevents chatter during slow voltage transitions.

Can the TLE4299GNTMA1 be used without connecting the RADJ and D pins?

Yes - RADJ can be tied to GND to select the default 4.6 V reset threshold, and D can be left unconnected if no reset delay is required (RO will assert immediately upon undervoltage). However, omitting the D capacitor disables programmable reset timing, and leaving RADJ floating may cause undefined reset behavior; both pins must be intentionally terminated per datasheet recommendations for reliable operation.

How does the inhibit function work, and which variant supports it?

The inhibit (INH) function is implemented only on the TLE4299GM variant (P-DSO-14-8), not on the TLE4299G (P-DSO-8-3) or TLE4299GNTMA1. A high logic level on INH enables regulation; pulling INH low disables the pass transistor, reducing quiescent current to <1 µA. Since TLE4299GNTMA1 is the G-version, it does not have INH - its "inhibit" capability is achieved externally via input disconnection or upstream switching.

What thermal considerations apply to the P-DSO-8-3 package in continuous 150 mA operation?

In P-DSO-8-3 packaging, the TLE4299GNTMA1 has a junction-to-ambient thermal resistance (R_thJA) of 200 K/W. At 150 mA and 13.5 V input (typical automotive), power dissipation is ~1.275 W, resulting in ~255 °C rise above ambient - exceeding safe limits. Therefore, PCB copper pour under the thermal pad and forced airflow or derating to ≤80 mA at 13.5 V is required for sustained operation at room ambient; R_thJP = 60 K/W enables more accurate board-level thermal modeling.