TLE4471GAUMA1 - Triple 450mA LDO Regulator | Infineon
料号： TLE4471GAUMA1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： TLE4471GAUMA1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TLE4471GAUMA1 （相同外形与封装尺寸） ——差异在于 Package, Input Voltage Range, Protection Features, Maximum Output Current, Output Type.
快速对比工具——选择替代料号进行并排对比：
TLE4470G
✅ 直接替换📋 参考替代料（不在目录中）
TLE42644GHTMA1
✅ 直接替换✓ 有现货
$0.71 / 个
查看数据手册 →TLE42744DV50ATMA1
✅ 直接替换✓ 有现货
$0.74 / 个
查看数据手册 →TLE42662GHTMA2
✅ 直接替换✓ 有现货
$1.18 / 个
查看数据手册 →TLE4471GAUMA1 最大额定值与电气特性
| 拓扑 | Very-low-dropout (LDO) triple linear regulator |
| 输出数量 | 3 |
| Main Output Current | 450 mA |
| Auxiliary Output 1 Current | 100 mA |
| Auxiliary Output 2 Current | 50 mA |
| 输出类型 | Positive Adjustable or Fixed |
| 输入电压范围 | Up to 42 V (load-dump tolerant) |
| Reset Output | Yes, with adjustable delay |
| Watchdog | Yes, integrated |
| 使能引脚 | Yes |
| 工作温度范围 | -40 °C to +150 °C junction |
| 封装 | PG-DSO-20-12 (Power SOIC with exposed pad) |
| 安装类型 | Surface Mount |
| AEC-Q100 Qualified | Yes |
| RoHS 状态 | Compliant |
| Series | OPTIREG™ |
TLE4471GAUMA1 引脚配置
| 引脚 1 | IN — Input supply voltage |
| 引脚 2 | IN — Input supply voltage |
| 引脚 3 | EN — Enable input |
| 引脚 4 | Q3 — Auxiliary output 2 (50 mA) |
| 引脚 5 | GND — Ground |
| 引脚 6 | Q2 — Auxiliary output 1 (100 mA) |
| 引脚 7 | Q1 — Main regulator output (450 mA) |
| 引脚 8 | GND — Ground |
| 引脚 9 | Q1 — Main regulator output sense |
| 引脚 10 | ADJ1 — Main output voltage adjust |
| 引脚 11 | RESET — Reset output (open collector) |
| 引脚 12 | DELAY — Reset delay capacitor |
| 引脚 13 | WDI — Watchdog input |
| 引脚 14 | WDO — Watchdog output |
| 引脚 15 | ROSC — Watchdog oscillator resistor |
| 引脚 16 | GND — Ground |
| 引脚 17 | NC — Not connected |
| 引脚 18 | NC — Not connected |
| 引脚 19 | NC — Not connected |
| 引脚 20 | EP — Exposed pad (thermal) |
典型应用
TLE4471GAUMA1 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： TLE4471GAUMA1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Triple-output integration with reset + watchdog （对比 TLE42644GHTMA1)
- AEC-Q100 Grade 0 over-temperature operation （对比 TLE42744DV50ATMA1)
- Tracked auxiliary outputs for MCU + sensor sequencing （对比 TLE4470G)
设计说明
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.
合规信息
AEC-Q100 qualified per Infineon datasheet. RoHS and REACH compliant per part marking. Halogen-free per Infineon OPTIREG family specification.
