TLF80511TCATMA1 - 5V 400mA LDO Regulator | Infineon | Automotive AEC-Q100
MPN: TLF80511TCATMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.89 | $445.00 |
| 1,000 | $0.72 | $720.00 |
TLF80511TCATMA1 Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly higher than the desired output. Within the broader power management IC taxonomy, an LDO belongs to the linear regulator family, which in turn sits inside the voltage regulator category, used wherever a clean, low-noise, fixed rail is required. LDOs are particularly favored in noise-sensitive analog and microcontroller subsystems because, unlike switching regulators, they introduce no switching ripple.
Key features of the TLF80511TCATMA1 include a low dropout voltage of approximately 200 mV at 200 mA load, an enable input for power sequencing, and integrated protection functions: overtemperature shutdown and output current limiting. The regulator is internally compensated, so no external compensation network is required, and it requires only small ceramic input and output capacitors for stable operation. The PG-TO263-3-1 package offers a low thermal resistance of roughly 31 Β°C/W at the tab, allowing it to dissipate power from the exposed tab directly into the PCB copper.
Architecturally, the TLF80511TC uses a PNP pass-element topology with a precision bandgap reference and a high-gain error amplifier. Its very low quiescent current (40 Β΅A typical) and high input voltage tolerance support its use in systems supplied directly from a 12 V automotive battery, where cranking transients and load-dump surges are common. Compared to a switching pre-regulator followed by a small LDO, the TLF80511TC can replace both stages in lighter-load rails, saving BOM cost and PCB area.
Typical applications include automotive body ECUs, body control modules, instrument clusters, lighting ECUs, and HVAC controllers. It is also useful in industrial PLCs, sensor interfaces, and any 5 V microcontroller supply that is fed from a wide or noisy DC bus.
When designing with this part, place input and output ceramic capacitors as close as possible to the IC and tie the tab to a sufficiently large copper pour to keep junction temperature within limits. Compared with smaller SOT-23 LDOs, the DPAK tab dramatically eases thermal management for 12 V-to-5 V conversion at 400 mA.
Drop-in alternatives for TLF80511TCATMA1 β 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 TLF80511TCATMA1 (same form factor and footprint) β differing in Input Voltage Range, MSL Level, Operating Junction Temperature, Output Type, Package.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLF80511TCV33TMA1
β Drop-Inπ Reference alternative (not in catalog)
TLE4276SV50NKSA1
β Drop-Inπ Reference alternative (not in catalog)
L78M05CDT-TR
β Drop-Inπ Reference alternative (not in catalog)
MC7805CDTRKG
β Drop-Inπ Reference alternative (not in catalog)
AZ7805T-E1
β Drop-Inπ Reference alternative (not in catalog)
TLF80511TCATMA1 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed (5 V) |
| Output Voltage | 5 V |
| Maximum Output Current | 400 mA |
| Input Voltage Range | Up to 45 V |
| Dropout Voltage | 200 mV (typ) at 200 mA |
| Quiescent Current (Iq) | 40 Β΅A (typ, standby) |
| Output Tolerance | Β±2 % (typ) |
| Enable Pin | Yes |
| Operating Junction Temperature | -40 Β°C to +150 Β°C |
| Package | PG-TO263-3-1 (DPAK) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| Automotive Qualification | AEC-Q100 Grade 1 |
| RoHS Status | Compliant |
| Protection Features | Overtemperature shutdown, output current limit |
TLF80511TCATMA1 Pin Configuration
| Pin 1 | INPUT β Unregulated input voltage; tie to 12 V battery through reverse-battery protection |
| Pin 2 | GROUND β Common ground reference for input and output |
| Pin 3 | OUTPUT β Regulated 5 V output; connect to load and output capacitor |
| Pin TAB | TAB β Exposed thermal pad, internally connected to GROUND - solder to PCB copper for heatsinking |
Typical Applications
TLF80511TCATMA1 is suitable for 6 applications: Automotive Body Control Module (BCM), Automotive Instrument Cluster Power Supply, LED Lighting ECU, Industrial PLC 5 V Logic Rail, HVAC Control Module, Sensor Interface / Sensor Supply.
Automotive Body Control Module (BCM)
The TLF80511TCATMA1 is well suited as the main 5 V rail in a body control module because it accepts the full automotive 12 V battery range including cranking dips down to ~6 V and load-dump surges up to 45 V. Its 400 mA continuous rating easily powers BCM digital logic, CAN/LIN transceivers, and relay drivers. The 40 Β΅A quiescent current minimizes dark-current drain on the always-on battery rail - critical for meeting OEM quiescent-current budgets under 100 Β΅A per ECU. AEC-Q100 Grade 1 qualification at -40 Β°C to +150 Β°C TJ removes the need for separate derating analysis.
Recommended
Automotive Instrument Cluster Power Supply
Instrument clusters require a stable, low-noise 5 V rail for stepper-motor gauge drivers, microcontrollers, and display backlight controllers. The TLF80511TCATMA1's fixed 5 V output with Β±2 % tolerance supplies those loads directly without a switching pre-regulator, eliminating switching EMI that could couple into the analog gauge paths. The PG-TO263-3-1 tab dissipates the (VIN-VOUT) Γ IOUT heat efficiently across a copper pour on the cluster PCB. Combined with AEC-Q100 qualification, this is a regulator commonly specified for cluster designs across major OEMs.
Recommended
LED Lighting ECU
LED lighting ECUs for headlamps and rear lamps need a clean 5 V supply for microcontroller, CAN, and FET gate drivers while sitting next to high-current LED strings. The TLF80511TCATMA1 provides that 5 V rail from the 12 V battery with load-dump protection up to 45 V, and its low quiescent current keeps dark current low for parked-vehicle current budgets. Using a linear regulator also avoids the EMI that a switching converter would emit onto the same harness as the LED drivers, simplifying CISPR 25 EMC compliance.
Recommended
Industrial PLC 5 V Logic Rail
In 24 V industrial PLC digital-input modules, the TLF80511TCATMA1 can step the 24 V bus down to 5 V for optocouplers, MCUs, and signal-conditioning ASICs. With up to 45 V input tolerance, it survives the inductive transients common on long cable runs in factory environments. The exposed tab handles sustained dissipation, and the AEC-Q100 over-spec adds margin in high-ambient factory cabinets. Designers can drop in this part when they need a robust 5 V rail without adding a switching converter's filter complexity.
Recommended
HVAC Control Module
Automotive HVAC modules require a reliable 5 V rail for blower-motor control logic, temperature-sensor conditioning, and the panel microcontroller. The TLF80511TCATMA1's wide input tolerance covers cranking and load-dump on a 12 V battery, and its low quiescent current keeps parasitic battery drain low when the vehicle is parked. The DPAK tab dissipates the linear losses into the HVAC housing's PCB copper, allowing a small BOM and a compact module layout that fits behind the dashboard.
Recommended
Sensor Interface / Sensor Supply
In automotive and industrial sensor-interface boards, the TLF80511TCATMA1 provides a clean 5 V rail for Hall-effect, pressure, and position sensors with analog outputs. Linear regulation avoids the switching ripple that would otherwise inject noise into sensitive analog front-ends, improving ADC accuracy. The 400 mA rating supports multiple sensors on one rail, and the 45 V input tolerance protects against supply transients on long harness runs. AEC-Q100 qualification ensures reliability in harsh underbody or engine-bay locations.
Recommended
Recommended Products Summary
Engineering reference data for TLF80511TCATMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLF80511TCV33TMA1 | TLE4276SV50NKSA1 | L78M05CDT-TR | MC7805CDTRKG |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | STMicroelectronics | onsemi |
| Package | PG-TO263-3-1 (DPAK) | PG-TO263-3-1 (DPAK) - same | PG-TO220-3 - through-hole, different footprint | PG-TO263-3-1 (DPAK) - same | PG-TO263-3-1 (DPAK) - same |
| Output Voltage | 5 V | 3.3 V | 5 V | 5 V | 5 V |
| Maximum Output Current | 400 mA | 400 mA | 400 mA | 500 mA | 1 A |
| Maximum Input Voltage | 45 V | 45 V | 40 V | 35 V | 35 V |
| Enable Pin | Yes | Yes | Yes | No | No |
| Automotive Qualification | AEC-Q100 Grade 1 | AEC-Q100 Grade 1 | AEC-Q100 | Not qualified (commercial) | Not qualified (commercial) |
Key Differentiators
- Very low quiescent current for an automotive-grade 5 V LDO (vs L78M05CDT-TR)
- Wide 45 V input tolerance covers automotive load-dump directly (vs MC7805CDTRKG)
- Enable pin supports power sequencing (vs L78M05CDT-TR)
Design Notes
Estimated: at VIN = 12 V, VOUT = 5 V, and IOUT = 400 mA, the TLF80511TCATMA1 dissipates (12 - 5) Γ 0.4 = 2.8 W. With a typical DPAK theta_JA of 31 Β°C/W on a 1-square-inch 2 oz copper pour, the junction temperature rise above ambient is approximately 87 Β°C. In a 70 Β°C under-hood or dashboard-cabin ambient, TJ reaches about 157 Β°C - very close to the 150 Β°C AEC-Q100 limit. To stay safely below, either reduce VIN, reduce IOUT, or increase PCB copper area to at least 2 square inches and consider a small clip-on heatsink at the tab.
Solder the PG-TO263-3-1 exposed tab to a generous copper pour on the top layer (and stitch thermal vias to inner copper planes) so that the tab functions as both electrical ground and heatsink. Place the 1 Β΅F X7R ceramic input capacitor as close as possible to the IC's INPUT pin (pin 1) with short, wide traces; do the same for the 1 Β΅F X7R output capacitor at the OUTPUT pin (pin 3). Keep the ground return loop small to minimize EMI and improve transient response. Avoid routing sensitive analog signals under the regulator's tab to prevent noise coupling.
Do not assume the exposed tab is electrically floating - on the TLF80511TCATMA1 the tab is internally tied to GROUND, so it must be soldered to the ground copper pour, not to an isolated heat sink. Also be careful when substituting a competitor's DPAK LDO (e.g., MC7805, L78M05) because some variants leave the tab floating or connect it to OUTPUT - swapping without verifying can cause a short to ground. Finally, observe the maximum input voltage of 45 V including transients; a TVS clamp upstream is recommended if the input is fed directly from a 12 V automotive battery that can see load-dump surges.
Compliance Information
AEC-Q100 Grade 1 qualified for automotive applications. RoHS and REACH compliant per Infineon product page. Halogen-free per JEDEC JS709B.
