TLE4476D - 350mA/430mA Dual LDO Regulator | Infineon
MPN: TLE4476D ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.48 | $24.80 |
| 100 | $2.12 | $212.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.62 | $1,620.00 |
| 2,500 | $1.41 | $3,525.00 |
TLE4476D Overview
A low-dropout (LDO) linear regulator is a type of voltage regulator that maintains a stable output using a pass transistor operating in the linear region, even when the input-to-output differential is small (typically well under 1 V). LDOs are a subset of linear regulators within the broader voltage regulator family, which itself belongs to power management ICs. Compared with switching regulators, LDOs provide ultra-clean, low-noise output at the cost of efficiency equal to VOUT/VIN, so their best-fit roles are post-switcher filtering rails and lower-current analog/memory supplies where noise floor is the dominant constraint.
Key features of the TLE4476D include ±4% output voltage accuracy on both outputs, integrated protection against overload, short-circuit and overtemperature conditions, low quiescent current in the OFF state for battery-drained parked-vehicle scenarios, and the wide 42 V maximum input rating that absorbs load-dump transients on 12 V automotive rails. The reset/watchdog and early-warning functions in the Infineon OPTIREG family of parts provide an additional layer of MCU supervision that complements the regulator's basic protection suite.
Internally, the TLE4476D uses bipolar pass transistors with a precision bandgap reference. Each output stage is followed by separate compensation and current-limit loops, with thermal shutdown and reverse-polarity protection that allow the regulator to recover gracefully from wiring faults common in automotive harnesses. The PG-TO252-5 (DPAK) package provides a thermal resistance suited to multi-hundred-mA dissipation with a reasonable PCB copper area beneath the exposed tab.
Typical applications include automotive body and powertrain ECUs, where 3.3V powers the MCU core and 5V powers sensors and CAN transceivers; industrial PLCs requiring dual-rail supply from a 24 V bus; and battery-backed microcontroller modules in which the 5V rail can be shut down by the EN pin during deep-sleep to extend standby time. The 42 V input range also makes the part attractive for HVAC, lighting controllers and any system that must survive automotive transients.
When designing with the TLE4476D, derate the input-to-output differential carefully - at 12 V in and 5 V out at 430 mA the part dissipates roughly 3 W, demanding an exposed-pad copper pour of at least 1 square inch for reliable thermal performance. Place input and output ceramic capacitors close to the IC pins and respect the EN logic thresholds in the datasheet to guarantee clean power-up sequencing across operating-temperature corners.
This page synthesizes distributor inventory, drop-in alternatives and practical layout notes that complement the Infineon datasheet v02.60.
Drop-in alternatives for TLE4476D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE4276-2S
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLE4299G
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLE7270-2D
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLE4271-2S
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TLE4476D Maximum Ratings & Electrical Characteristics
| Topology | Dual LDO (Low-Dropout) Linear Regulator |
| Output 1 Voltage | 3.3 V ± 4% |
| Output 1 Current | 350 mA |
| Output 2 Voltage | 5.0 V ± 4% |
| Output 2 Current | 430 mA |
| Input Voltage Range | Up to 42 V |
| Enable Input | Yes (for Output 2 / 5V rail) |
| Quiescent Current (OFF state) | Low quiescent current in OFF state |
| Protection Features | Overload, short-circuit, overtemperature |
| Package | PG-TO252-5-11 (DPAK) |
| Mounting Type | Surface Mount |
| Application Category | Automotive / Industrial / Battery-powered microcontrollers |
TLE4476D Pin Configuration
| Pin 1 | IN — Input supply (up to 42 V) |
| Pin 2 | EN — Enable for Output 2 (5V) |
| Pin 3 | GND — Ground |
| Pin 4 | Q2 — 5.0 V output / 430 mA |
| Pin 5 | Q1 — 3.3 V output / 350 mA |
Typical Applications
TLE4476D is suitable for 6 applications: Automotive ECU Power Supply, Industrial 24V PLC Subsystem, Battery-Backed Microcontroller Module, HVAC and Climate Control Module, Automotive Lighting Controller, Accessory Power Module / Sensor Hub.
Automotive ECU Power Supply
The TLE4476D is well matched to automotive ECU power conditioning because it delivers both the 5 V CAN-transceiver/sensor rail and the 3.3 V MCU-core rail from a single 12 V bus, eliminating the dual-IC footprint. Its 42 V input withstands 12 V load-dump and 24 V jump-start transients without external preregulation, and the EN pin on Output 2 (5 V) lets the MCU cleanly switch off sensors during ignition-off to protect battery reserves. Compared with two discrete LDOs, the TLE4476D reduces PCB area, simplifies thermal design (one exposed pad for shared dissipation) and ensures both rails track within ±4% across temperature. Internal short-circuit, overload and overtemperature protection satisfy automotive ECU fault-tolerance requirements.
Recommended
Industrial 24V PLC Subsystem
In a 24 V industrial PLC backplane, the TLE4476D's 42 V maximum input tolerates 24 V industrial bus transients while its two fixed outputs (3.3 V/350 mA and 5 V/430 mA) power an MCU plus analog I/O directly. The regulated 5 V rail can drive opto-isolated digital inputs while the 3.3 V rail feeds logic-level ADC front-ends; both rails are protected against sustained overload and short-circuit conditions typical of miswired field wiring. Because the device integrates two LDOs with shared thermal management, designers can place it on one exposed-pad copper pour without the layout complexity of routing two separate regulators. The ±4% output tolerance satisfies most PLC logic tolerances without secondary regulation.
Recommended
Battery-Backed Microcontroller Module
For battery-backed or always-on microcontroller modules (e.g., body controllers, alarms, telematics units), the TLE4476D's EN pin on the 5 V rail allows the system MCU to power-gate peripheral sensors during deep-sleep, while the 3.3 V rail keeps the MCU core alive. The device's low OFF-state quiescent current minimizes battery drain, an essential parameter for parked-vehicle current budgets below 100 µA. With its 3.3 V + 5 V dual output, the part replaces two discrete LDOs, reducing BOM cost and board area. Automotive-grade temperature range and integrated overtemperature protection suit underhood and underbody module placement.
Recommended
HVAC and Climate Control Module
In automotive HVAC control modules, the TLE4476D supplies a 3.3 V MCU and a 5 V sensor/actuator rail directly from the 12 V battery rail. The 42 V transient withstand supports the harsh underhood electrical environment, and overload protection guards against actuator short circuits that can occur with stuck dampers or blower motors. Combined short-circuit and overtemperature protection lets the module survive field faults without external fuses, simplifying the BOM and improving manufacturability. The DPAK package dissipates 5V/430 mA continuous current comfortably with a modest copper pour beneath the exposed tab.
Recommended
Automotive Lighting Controller
LED lighting modules and headlamp controllers can use the TLE4476D to derive a logic 3.3 V MCU rail and a 5 V rail for FET drivers from the same 12 V battery line, with the 42 V input rating absorbing load-dump spikes that occur when nearby injectors or motors switch. The 5 V EN function supports PWM sequencing of daytime running lights and turn indicators, while the 3.3 V rail stays live to maintain controller state. Both outputs are short-circuit protected, which is important in lighting modules where field failures often involve pin-to-pin shorts in the harness. The DPAK footprint and exposed thermal pad keep junction temperature low under continuous drive.
Recommended
Accessory Power Module / Sensor Hub
Aftermarket telematics units and sensor hubs integrate an MCU plus 5 V sensors (GPS, accelerometers, cameras) and benefit from the TLE4476D's single-IC dual-rail architecture. The 3.3 V rail powers the MCU while the 5 V rail supplies GPS modems and MEMS sensors that prefer 5 V supply to maximize dynamic range; the EN-controlled 5 V rail lets the MCU shut down power-hungry peripherals during sleep. The 42 V maximum input survives jump-start transients on accessory battery hookups. Overtemperature shutdown and ±4% output accuracy suit production automotive tolerance stacks without secondary regulators.
Recommended
Recommended Products Summary
Engineering reference data for TLE4476D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE4276-2S | TLE4299G | TLE7270-2D | TLE4271-2S |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-TO252-5-11 (DPAK) | PG-TO252-5-11 (DPAK) - same | PG-TO252-5-11 (DPAK) - same | PG-TO252-5-11 (DPAK) - same | PG-TO252-5-11 (DPAK) - same |
| Output Count | 2 (3.3V + 5V) | 1 (5V) | 1 (5V) | 1 (5V) | 1 (5V) |
| Output Voltage | 3.3 V and 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
| Total Load Current | 780 mA (350 + 430) | 400 mA | 100 mA | 300 mA | 450 mA |
| Input Voltage Max | 42 V | 42 V | 42 V | 42 V | 42 V |
| Enable Pin | Yes (5V output) | No | Yes | Yes | No |
| Automotive Application | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Single-IC 3.3 V + 5 V dual output in DPAK (vs TLE4276-2S (5 V single))
- Higher total current capability than TLE4299G (vs TLE4299G (5 V/100 mA))
- EN pin on Output 2 enables sequenced power gating (vs TLE4271-2S (no EN))
Design Notes
Estimated: with VIN = 12 V, VOUT = 5 V, and IOUT = 430 mA continuous on the 5 V rail, dissipation is roughly (12 - 5) × 0.43 = 3.0 W. With the PG-TO252-5 exposed-pad copper pour and an ambient of 85 °C, junction temperature will rise well above the [DATA_NEEDED: TJ operating range] limit if the pour area is below ~1 square inch. Provide at least 1 in² of 2 oz copper under the tab, or add a small heatsink, when running both outputs at their maximum rated currents simultaneously.
Place the input ceramic capacitor (≥ 1 µF X7R) directly at the IN pin and the output capacitors at the Q1 (3.3 V) and Q2 (5 V) pins with shortest possible return paths to the exposed pad (GND). The DPAK tab is the primary thermal path; use thermal vias arrayed beneath the tab to conduct heat to the bottom layer. Avoid running switching traces under the package to prevent noise coupling into the analog rails.
Do not assume the EN pin on the TLE4476D controls Output 1 (3.3 V); only Output 2 (5 V) is gated, so the MCU rail stays live whenever VIN is present - design the system accordingly. Reverse-battery polarity protection is not internal; an external series Schottky or P-MOSFET is required if the part may be mis-wired during service. The ±4% output tolerance is acceptable for logic but not for ADC references; pair with a precision reference if a tight 3.3 V reference is needed.
Compliance Information
RoHS, REACH, AEC-Q100 and lead-free status were not stated in the verified distributor snippets; values default to "unknown" pending confirmation from the Infineon product-page Material Content Data Sheet.
