TLE4276DVATMA2 - 400mA, 40V LDO Regulator | Infineon OPTIREG
MPN: TLE4276DVATMA2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.59 | $2.59 |
| 10 | $2.33 | $23.30 |
| 100 | $1.95 | $195.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.35 | $1,350.00 |
TLE4276DVATMA2 Overview
An LDO (low-dropout regulator) is a type of linear voltage regulator that maintains a stable output voltage even when the input-to-output voltage headroom is very small. LDOs belong to the broader class of voltage regulators, which sit within the power management IC (PMIC) hierarchy in a typical electronic system. Unlike switching converters, LDOs introduce no switching noise, trading efficiency for clean, ripple-free output - a critical advantage for analog, sensor and microcontroller supply rails.
Key specifications include a 400 mA maximum output current, a typical quiescent current below 100 microamps in normal operation, and an inhibit (enable) input that drops current consumption to less than 10 microamps in standby. Built-in protection features include short-circuit current limit, reverse-polarity protection, thermal shutdown, and an integrated reset/watchdog circuit for microcontroller supply supervision. The wide 40 V input range supports direct connection to 12 V or 24 V automotive bus rails without pre-regulation.
Architecturally, the TLE4276DV combines a bandgap reference, an error amplifier, an N-channel MOSFET pass element and a thermal-regulation loop, all trimmed at wafer level to deliver a tight 4% output accuracy across line, load and temperature. The exposed tab provides a low thermal resistance path, enabling sustained 400 mA output at elevated ambient temperatures with a properly sized copper land.
Typical applications include automotive body and chassis ECUs, sensor and actuator supplies, industrial 24 V bus regulators, and any 12 V/24 V system that needs a clean, well-protected auxiliary rail. The AEC-Q100 qualification also makes it suitable for under-hood and battery-management subsystems.
When designing with this part, always connect the exposed tab to a sufficient copper pour to keep the junction within the SOA. Place input/output ceramic capacitors as close as possible to the device to suppress input transients on automotive load-dump events.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the Infineon datasheet, providing an engineer-ready reference for sourcing and second-sourcing decisions.
Drop-in alternatives for TLE4276DVATMA2 — 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 TLE4276DVATMA2 (same form factor and footprint) — differing in Output Voltage Accuracy, Package, Protection Features, Mounting Type, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE4276DVATMA1
✅ Drop-In📋 Reference alternative (not in catalog)
TLE4276V50
✅ Drop-In📋 Reference alternative (not in catalog)
TLE4276V85
✅ Drop-In📋 Reference alternative (not in catalog)
TLE4276V10
✅ Drop-In📋 Reference alternative (not in catalog)
TLE42764DVATMA1
✅ Drop-In✓ In Stock
$0.74 / Unit
View Datasheet →TLS810B1LDV50XUMA1
✅ Drop-In✓ In Stock
$0.34 / Unit
View Datasheet →TLE4276DVATMA2 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Family | OPTIREG Linear |
| Regulator Type | LDO (Low-Dropout), Positive Adjustable |
| Number of Outputs | 1 |
| Output Voltage Range | Adjustable (typ. 2.5 V to 20 V via external divider) |
| Maximum Output Current | 400 mA |
| Input Voltage (max) | 40 V |
| Quiescent Current (Iq) | < 100 µA typical (operating) |
| Standby Current (Inhibit) | < 10 µA |
| Output Voltage Accuracy | ±4% |
| PSRR | 54 dB at 100 Hz (per Alibaba listing mirror) |
| Inhibit / Enable Pin | Yes (active-high, IQ drops below 10 µA) |
| Reset Output | Yes (integrated reset/watchdog for MCU supervision) |
| Protection Features | Short-circuit, reverse polarity, thermal shutdown, overtemperature |
| Package | PG-TO252-5-11 (DPAK, 5 leads + tab, surface mount) |
| Mounting Type | Surface Mount (DPAK/TO-252) |
| Operating Temperature | -40 °C to +150 °C Tj (automotive grade) |
| Automotive Qualification | AEC-Q100 |
| RoHS Status | Compliant |
TLE4276DVATMA2 Pin Configuration
| Pin 1 | IN — Input voltage (up to 40 V); bypass with 100 nF to GND |
| Pin 2 | INH — Inhibit (enable) input; high = standby, low = enable |
| Pin 3 | GND — Ground (also tied to tab) |
| Pin 4 | ADJ/Q — Adjustable feedback / output sense (DV variant); tie to VOUT divider |
| Pin 5 | TAB — Exposed thermal tab / ground; solder to copper pour |
Typical Applications
TLE4276DVATMA2 is suitable for 6 applications: Automotive Body Control Module (BCM) ECU, Industrial 24 V Sensor / Actuator Supply, Battery-Connected Always-On Telematics, Reverse-Battery and Load-Dump Protected Auxiliary Rail, LED Driver Auxiliary Rail, Power Supply for MCU with Reset Supervision.
Automotive Body Control Module (BCM) ECU
The TLE4276DVATMA2's 40 V input range and AEC-Q100 qualification make it an ideal post-protection 5 V rail source for automotive BCMs that operate directly from the 12 V battery bus. The IC sustains load-dump transients up to 40 V and regulates down to 5 V at up to 400 mA, feeding sensors, relays, LIN/CAN transceivers and a host MCU. Its integrated reset output supervises the MCU's VCC rail and asserts a clean power-good signal during cold-crank events, while reverse-polarity and short-circuit protection prevent ECU damage from jump-start or wiring faults. Compared to a switching pre-regulator, the LDO adds no EMI on the analog sensor rails and simplifies CISPR 25 emissions compliance.
Recommended
Industrial 24 V Sensor / Actuator Supply
Factory-automation PLCs frequently derive 5 V or 3.3 V rails from a 24 V industrial bus, which is exposed to inductive kickback from solenoids and contactors. The TLE4276DVATMA2 handles continuous input up to 40 V and load transients consistent with IEC 61131-2, while its adjustable output (set via R1/R2 divider) lets the same PCB support 5 V sensor rails or 3.3 V MCU rails by changing two resistors. The integrated thermal shutdown and foldback current limit protect the module if a downstream sensor shorts. The PG-TO252-5-11 DPAK package is well suited to through-hole-style screw-terminal PLC modules where the exposed tab is bolted to a copper area for heat spreading.
Recommended
Battery-Connected Always-On Telematics
Telematics control units (TCUs) must stay connected even when the ignition is off, drawing only microamps from the 12 V lead-acid battery to avoid deep discharge. The TLE4276DVATMA2's standby current below 10 microamps in inhibit mode lets the TCU gate the regulator from the MCU, sleeping at single-digit microamps while keeping key-off parasitic drain within the OEM < 100 µA budget. The wide 40 V VIN rating survives double-battery jump-start events, and the integrated reset pin provides clean MCU wake-up sequencing. Compared to discrete regulators, the part combines OVP/short-circuit/thermal protection in a single DPAK, saving PCB area in space-constrained telematics hardware.
Recommended
Reverse-Battery and Load-Dump Protected Auxiliary Rail
Truck and commercial-vehicle electrical systems routinely see 24 V nominal with load-dump transients above 35 V, while accidental reverse-battery hookups happen in service environments. The TLE4276DVATMA2 includes integrated reverse-polarity protection on VIN, sustaining -40 V transients without external MOSFETs, plus short-circuit-proof output for wiring faults. The 400 mA envelope is sufficient for camera modules, lighting controllers, or auxiliary sensor hubs, and the AEC-Q100 qualification simplifies PPAP documentation. The exposed tab provides a low thermal-resistance path for the (VIN-VOUT) x IOUT dissipation typical at high battery voltages.
Recommended
LED Driver Auxiliary Rail
Automotive interior and exterior LED drivers often need a clean 5 V logic rail alongside a switching LED current source. The TLE4276DVATMA2 supplies that 5 V rail directly from the 12 V battery, providing up to 400 mA for an LED controller IC, diagnostics MCU, and LIN/CAN interface - all while rejecting battery ripple at 54 dB PSRR (100 Hz). Because the LDO does not switch, it adds no EMI on the LED PWM frequency bands, simplifying CISPR 25 compliance for rear-lamp and DRL modules. The DPAK footprint matches industry-standard LED-driver PCBs, enabling drop-in upgrades from commercial-grade LDOs.
Recommended
Power Supply for MCU with Reset Supervision
The TLE4276DVATMA2 integrates a voltage supervisor that holds the MCU in reset until VOUT stabilizes above the threshold, eliminating the need for a standalone reset IC and saving PCB area in compact designs. The reset delay is programmable via an external capacitor, allowing the MCU vendor's POR timing to be matched precisely. This makes the part especially attractive for safety-critical ECUs (ASIL-B capable designs) where deterministic power-on sequencing is mandated. Combined with the inhibit pin for key-off shutdown, the regulator enables a complete MCU power tree in a single 5-pin DPAK - significantly reducing BOM cost and board area compared to discrete LDO + supervisor solutions.
Recommended
Recommended Products Summary
Engineering reference data for TLE4276DVATMA2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE4276DVATMA1 | TLE4276V50 | TLE4276V85 | TLE4276V10 | TLE42764DV | TLS810B1LDV50 |
|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-TO252-5-11 (DPAK-5) | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5-11 (DPAK-5) - same | PG-TO252-5 (DPAK-5) - same |
| Output Voltage | Adjustable | Adjustable | 5.0 V fixed | 8.5 V fixed | 10 V fixed | Adjustable | 5.0 V fixed |
| Max Output Current | 400 mA | 400 mA | 400 mA | 400 mA | 400 mA | 400 mA | 500 mA |
| Input Voltage (max) | 40 V | 40 V | 40 V | 40 V | 40 V | 40 V | 40 V |
| Inhibit / Enable Pin | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Reset Output | Yes | Yes | Yes | Yes | Yes | Yes (varied delay) | No |
| AEC-Q100 | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Adjustable output in the same DPAK-5 footprint as fixed-voltage siblings (vs TLE4276V50)
- Integrated reset / watchdog supervision in a single 5-pin package (vs TLS810B1LDV50)
- Reverse-polarity and load-dump tolerant up to 40 V (vs TLE4276DVATMA1 (same die))
Design Notes
Estimated: at VIN = 24 V nominal truck bus, VOUT = 5 V and IOUT = 400 mA, the TLE4276DVATMA2 dissipates approximately (24 - 5) × 0.4 = 7.6 W. The PG-TO252-5-11 DPAK has a typical θJA of around 50 °C/W on a 1 sq. inch copper pour, yielding a junction temperature rise of roughly 380 °C above ambient - well above the 150 °C Tj limit. Either (a) reduce VIN via upstream pre-regulation (e.g. a 12 V switching converter feeding this LDO), (b) drop IOUT below ~150 mA at high VIN, or (c) increase copper area / add a top-side heatsink. For 12 V battery designs, dissipation stays manageable below 200 mA load.
Place a 100 nF X7R ceramic bypass capacitor as close as possible to the IN pin and a 1 µF to 22 µF low-ESR ceramic at the OUT pin (per Infineon application note recommendation). The exposed tab must be soldered to a contiguous copper plane of at least 1 sq. inch to achieve the rated thermal performance. Use a star-ground topology that ties the LDO ground pin and tab to the power-ground island before joining the analog ground at a single point, preventing high-di/dt load currents from modulating the regulator reference.
Three pitfalls to avoid when designing with the TLE4276DVATMA2. First, do not float the inhibit pin - if unused, it must be tied to GND to enable the regulator; leaving it floating can cause intermittent startup. Second, when using the adjustable DV variant, choose 1% (or better) resistors for the feedback divider, and keep the parallel sum of R1||R2 below ~50 kΩ to minimize bias-current-induced output error. Third, the input pin is reverse-battery protected to -40 V, but a series-input fuse or PTC is still recommended for sustained overcurrent fault conditions; the IC's reverse protection is for transients, not indefinite reverse wiring.
Route the ADJ feedback trace as a short, guarded pair away from switching nodes and the IN/OUT power paths. Keep the thermal tab copper plane clear of signal traces that would be lifted by solder-mask-defined (SMD) pads - the tab requires a flooded, exposed land. On double-sided boards, add thermal vias in a 3x3 grid under the tab to reduce θJA; on four-layer boards with an internal ground plane, the plane itself provides adequate spreading if placed directly under the DPAK footprint.
Compliance Information
AEC-Q100 qualified per Infineon OPTIREG family page; RoHS and lead-free confirmed by Heisener product listing. REACH and conflict-mineral status inferred from Infineon automotive grade certification - request CFSI/CFIC from manufacturer for full traceability.
