TLE4471GAUMA1 - Triple 450mA LDO Regulator | Infineon
MPN: TLE4471GAUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $2.95 | $29.50 |
| 100 | $2.48 | $248.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.94 | $1,940.00 |
TLE4471GAUMA1 Overview
What is an LDO (Low-Dropout) linear regulator? It is a type of voltage regulator that maintains a stable output voltage even when the input supply is very close to the output voltage, achieving this through a pass transistor operating in the linear region. LDOs belong to the broader hierarchy of linear regulators, then voltage regulators, then power management ICs (PMICs), and ultimately the semiconductor device family. The "very-low-drop" designation of the TLE4471G indicates sub-1V dropout, allowing cold-crank survival on 12V automotive rails.
Key features of the TLE4471GAUMA1 include integrated reset generation with adjustable delay, a watchdog timer, an enable input for power sequencing, and very low quiescent current in standby for battery-sensitive applications. The device provides comprehensive protection: thermal shutdown, overcurrent limiting on all three outputs, short-circuit protection, and reverse-polarity robustness. Its PG-DSO-20 power package offers an exposed thermal pad enabling efficient heat dissipation from the 450 mA main LDO.
Technically, the TLE4471G uses a PNP-DMOS pass topology on the main rail for low dropout, with tracking NPN-based regulators on the auxiliary rails. The main output reference accuracy is typically within 2 percent, with tracking outputs maintaining close matching to the master rail. Communication with the host MCU is supported through the reset and watchdog pins, enabling ISO 26262-style functional safety architectures where the regulator supervises the microcontroller supply.
Typical applications span automotive ECUs, body control modules, instrument clusters, gateway modules, and industrial PLC power supplies where multi-rail tracking, supervisor functions, and AEC-Q100 reliability are mandatory. The wide input voltage range accommodates 12V automotive bus systems including load-dump transients up to 42 V.
When designing with this part, ensure adequate copper area beneath the exposed pad to keep junction temperature below 150 °C, and place the input/output ceramic capacitors as close as possible to the relevant pins. The reset delay and watchdog timing are programmable via external resistor-capacitor networks, which should be chosen based on the host MCU startup time and oscillator stability requirements.
This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not consolidated in the manufacturer datasheet alone, supporting faster BOM selection and second-source qualification.
Drop-in alternatives for TLE4471GAUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TLE4471GAUMA1 (same form factor and footprint) — differing in Package, Input Voltage Range, Protection Features, Maximum Output Current, Output Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE4470G
✅ Drop-In📋 Reference alternative (not in catalog)
TLE42644GHTMA1
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →TLE42744DV50ATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →TLE42662GHTMA2
✅ Drop-In✓ In Stock
$1.18 / Unit
View Datasheet →TLE4471GAUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Very-low-dropout (LDO) triple linear regulator |
| Number of Outputs | 3 |
| Main Output Current | 450 mA |
| Auxiliary Output 1 Current | 100 mA |
| Auxiliary Output 2 Current | 50 mA |
| Output Type | Positive Adjustable or Fixed |
| Input Voltage Range | Up to 42 V (load-dump tolerant) |
| Reset Output | Yes, with adjustable delay |
| Watchdog | Yes, integrated |
| Enable Pin | Yes |
| Operating Temperature Range | -40 °C to +150 °C junction |
| Package | PG-DSO-20-12 (Power SOIC with exposed pad) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualified | Yes |
| RoHS Status | Compliant |
| Series | OPTIREG™ |
TLE4471GAUMA1 Pin Configuration
| Pin 1 | IN — Input supply voltage |
| Pin 2 | IN — Input supply voltage |
| Pin 3 | EN — Enable input |
| Pin 4 | Q3 — Auxiliary output 2 (50 mA) |
| Pin 5 | GND — Ground |
| Pin 6 | Q2 — Auxiliary output 1 (100 mA) |
| Pin 7 | Q1 — Main regulator output (450 mA) |
| Pin 8 | GND — Ground |
| Pin 9 | Q1 — Main regulator output sense |
| Pin 10 | ADJ1 — Main output voltage adjust |
| Pin 11 | RESET — Reset output (open collector) |
| Pin 12 | DELAY — Reset delay capacitor |
| Pin 13 | WDI — Watchdog input |
| Pin 14 | WDO — Watchdog output |
| Pin 15 | ROSC — Watchdog oscillator resistor |
| Pin 16 | GND — Ground |
| Pin 17 | NC — Not connected |
| Pin 18 | NC — Not connected |
| Pin 19 | NC — Not connected |
| Pin 20 | EP — Exposed pad (thermal) |
Typical Applications
TLE4471GAUMA1 is suitable for 6 applications: Automotive ECU Power Supply, Body Control Module, Instrument Cluster Supply, Industrial PLC Logic Supply, Gateway / Domain Controller, Sensor Cluster Power.
Automotive ECU Power Supply
The TLE4471GAUMA1 is a natural fit for 12 V automotive ECU power conditioning, where its 450 mA main output drives the microcontroller while the 100 mA and 50 mA tracked rails power CAN transceivers and sensors. AEC-Q100 qualification plus integrated reset and watchdog reduce BOM count versus discrete LDO+supervisor designs. With load-dump tolerance to 42 V, the device survives ISO 7637-2 transient pulses common on the automotive bus, eliminating the need for an external protection TVS in most cases.
Recommended
Body Control Module
Body control modules require multiple low-current rails for door actuators, lighting drivers, and LIN/CAN peripherals, all derived from the 12 V battery rail. The TLE4471GAUMA1's three outputs provide exactly this mix (450 mA + 100 mA + 50 mA) with tracking that ensures the MCU powers up first. The integrated watchdog simplifies ASIL-B functional safety architectures by supervising the host MCU firmware execution, reducing the need for an external supervisor IC.
Recommended
Instrument Cluster Supply
Digital instrument clusters need a clean 5 V rail for the graphics controller and a separate 3.3 V rail for the display backlight and indicator LEDs. The TLE4471GAUMA1 main 450 mA output powers the MCU and display driver, while the 100 mA tracked rail supplies analog signal conditioning. Reset and watchdog supervision ensure the cluster reboots safely if the MCU firmware hangs, critical for driving compliance and OEM acceptance.
Recommended
Industrial PLC Logic Supply
Industrial PLC systems require noise-immune multi-rail supplies for the CPU, digital I/O optocouplers, and analog front ends. The TLE4471GAUMA1's very-low-dropout regulator maintains regulation down to 6 V input, supporting ride-through of brown-out events on 24 V industrial buses. AEC-Q100 over-qualification provides extra margin for harsh factory environments with temperature swings and vibration, while the watchdog supervises PLC processor execution.
Recommended
Gateway / Domain Controller
Central vehicle gateways aggregate CAN, LIN, FlexRay, and Ethernet traffic and need redundant supervision plus multi-rail power. The TLE4471GAUMA1 supplies the gateway MCU plus its transceivers while the integrated reset and watchdog enable dual-MCU lockstep architectures. The exposed-pad PG-DSO-20 package handles sustained 450 mA load at elevated ambient temperatures, common in sealed gateway enclosures.
Recommended
Sensor Cluster Power
Modern sensor clusters combine radar, camera, and ultrasonic processing on a single board with mixed 5 V and 3.3 V domains. The TLE4471GAUMA1 supplies the main 5 V rail to the sensor MCU, while the 100 mA and 50 mA outputs drive analog front ends and reference voltages. Tracking accuracy between rails improves ADC measurement integrity, and the watchdog prevents sensor lockup in field deployment.
Recommended
Recommended Products Summary
Engineering reference data for TLE4471GAUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE4470G | TLE42644GHTMA1 | TLE42744DV50ATMA1 |
|---|---|---|---|---|
| Package | PG-DSO-20-12 | PG-DSO-20-12 - same | PG-DSO-12 | PG-TO-252-5 (DPak) |
| Brand | Infineon | Infineon | Infineon | Infineon |
| Number of Outputs | 3 | 2 | 1 | 1 |
| Main Output Current | 450 mA | 450 mA | 400 mA | 450 mA |
| Reset/Supervisor | Reset + Watchdog | Reset + Watchdog | Reset only | Reset only |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
| Output Type | Adjustable/Fixed | Fixed 5 V + 3.3 V | Fixed 5 V | Fixed 5 V |
| Series | OPTIREG | OPTIREG | OPTIREG | OPTIREG |
Key Differentiators
- Triple-output integration with reset + watchdog (vs TLE42644GHTMA1)
- AEC-Q100 Grade 0 over-temperature operation (vs TLE42744DV50ATMA1)
- Tracked auxiliary outputs for MCU + sensor sequencing (vs TLE4470G)
Design Notes
Estimated: at VIN = 14 V (nominal automotive), VOUT = 5 V, and 450 mA load, the main LDO dissipates approximately (14 V − 5 V) × 0.45 A = 4.05 W. With a PG-DSO-20-12 exposed pad and proper PCB copper (≥ 4 cm² 2 oz), θJA is approximately 35 °C/W, yielding a 140 °C junction rise above ambient — derate at 85 °C ambient to stay within the 150 °C junction limit. Use a multilayer PCB with thermal vias for optimal heat removal.
Place input capacitors (≥ 1 µF X7R) within 5 mm of the IN pins to suppress load-dump and cold-crank transients. Place output capacitors (≥ 1 µF X7R, ESR < 0.5 Ω) directly at Q1, Q2, Q3 pins. The exposed pad must be soldered to a continuous ground copper pour with thermal vias (≥ 9 vias of 0.3 mm diameter) to achieve the datasheet thermal resistance. Avoid routing high-current traces near the EN, RESET, and WDI pins to prevent noise injection.
Do not operate the watchdog with an open WDI pin — it will trigger spurious resets; pull WDI high through 10 kΩ or drive it from the host MCU. The DELAY capacitor sets reset pulse width; values below 1 nF may violate minimum reset specification. Ensure that Q2 and Q3 tracked outputs never exceed their load capability (100 mA / 50 mA) or thermal shutdown will engage and latch the main output into fault mode on shared thermal pad designs.
Keep the ADJ1 feedback trace short and away from switching nodes; long traces add capacitance that destabilizes the loop. The ROSC resistor value determines watchdog timing window — use 1% tolerance to maintain watchdog accuracy across temperature. For load-dump compliance (ISO 7637-2), add a 100 nF X7R capacitor directly at IN pins and consider a series ferrite bead if the upstream bus is noisy.
Compliance Information
AEC-Q100 qualified per Infineon datasheet. RoHS and REACH compliant per part marking. Halogen-free per Infineon OPTIREG family specification.
