TLE8366EVXUMA1 - 1.8A 45V Step-Down DC/DC | Infineon
MPN: TLE8366EVXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.99 | $1.99 |
| 10 | $1.85 | $18.50 |
| 100 | $1.62 | $162.00 |
| 500 | $1.38 | $690.00 |
| 1,000 | $1.18 | $1,180.00 |
TLE8366EVXUMA1 Overview
A buck converter (also called step-down switching regulator) is a switched-mode power supply topology that uses an inductor, a synchronous or asynchronous switch, and a control loop to convert a higher DC input voltage into a lower, well-regulated DC output voltage with efficiencies typically above 90 %. Within the power management hierarchy, the TLE8366 sits between a high-voltage battery or bus rail and downstream point-of-load regulators, providing an isolated, regulated intermediate rail for analog, microcontroller, or sensor subsystems.
Key features of this variant include 4.75 V to 45 V wide input range (suitable for 12 V and 24 V automotive buses with load-dump transients), adjustable output from 0.6 V to 16 V via external resistor divider, integrated 1.8 A power switch, PWM current-mode control, cycle-by-cycle current limiting, over-temperature shutdown, input undervoltage lockout, and an enable pin that drops quiescent current below 2 µA in shutdown. The switching frequency is fixed, allowing predictable EMI filter design.
The TLE8366 uses current-mode control with internal slope compensation, providing excellent line and load transient response. The exposed thermal pad allows direct PCB heat-sinking, supporting continuous 1.8 A output across the automotive -40 °C to +150 °C junction temperature range with proper board layout.
Typical applications include automotive ECUs, body control modules, instrument clusters, HVAC controllers, sensor power supplies, industrial 24 V bus systems, and any point-of-load regulation downstream of a noisy or wide-ranging input rail. The wide input voltage range also makes it suitable for battery-powered equipment with deeply discharged cells.
When designing with this device, choose the inductor, output capacitor, and bootstrap capacitor per the manufacturer datasheet's reference design values. Place the input ceramic capacitor as close as possible to the VIN and PGND pins to minimize switching-node ringing, and use sufficient copper area on the exposed pad for thermal dissipation at maximum load.
This page synthesizes Infineon product-page data, distributor pricing, parametric cross-references, and practical design considerations to give engineers a single, citable reference that complements the manufacturer datasheet.
Drop-in alternatives for TLE8366EVXUMA1 — 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 TLE8366EVXUMA1 (same form factor and footprint) — differing in Package, Input Voltage Range, Operating Temperature Range, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TLE8366EV33XUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
TLE8366EV50XUMA1
✅ Drop-In📋 Reference alternative (not in catalog)
TLE94110ESXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.45 / Unit
View Datasheet →SL8366
✅ Drop-In📋 Reference alternative (not in catalog)
TLS810B1LDV50XUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.34 / Unit
View Datasheet →TLE8366EVXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Buck (Step-Down) Synchronous PWM |
| Input Voltage Range | 4.75 V to 45 V |
| Output Voltage Range | 0.6 V to 16 V (adjustable) |
| Output Current | 1.8 A |
| Reference Voltage | 0.6 V (feedback) |
| Quiescent Current (Shutdown) | < 2 µA |
| Control Method | Current-Mode PWM |
| Current Limit | Cycle-by-cycle |
| Protection Features | Over-temperature shutdown, Input UVLO, Cycle-by-cycle current limit |
| Enable Pin | Yes (active-high, shutdown < 2 µA) |
| Operating Temperature (Junction) | -40 °C to +150 °C (automotive) |
| Package | PG-DSO-8 with Exposed Pad (3.90 mm body width) |
| Mounting Type | Surface Mount |
| MSL Level | MSL per JEDEC J-STD-020 (verify per reel label) |
| RoHS Status | Compliant |
| Automotive Qualified | Yes (AEC-Q100 grade targeted, automotive use) |
TLE8366EVXUMA1 Pin Configuration
| Pin 1 | VIN — Input supply voltage (4.75 V to 45 V) |
| Pin 2 | EN — Enable (active-high; < 2 µA shutdown when low) |
| Pin 3 | FB — Feedback (0.6 V reference; connect to VOUT divider) |
| Pin 4 | GND — Analog ground |
| Pin 5 | BST — Bootstrap capacitor for high-side gate drive |
| Pin 6 | SW — Switch node (to external inductor) |
| Pin 7 | PGND — Power ground (return for high-side switch) |
| Pin 8 | NC — Not connected (per datasheet) |
| Pin EP | Exposed Pad — Thermal pad, must be soldered to PCB ground plane |
Typical Applications
TLE8366EVXUMA1 is suitable for 6 applications: Automotive ECU Power Supply, Body Control Module (BCM) Rails, Industrial 24 V Sensor Power, Instrument Cluster Power, HVAC Controller Power, Battery-Powered Portable Equipment.
Automotive ECU Power Supply
The TLE8366EVXUMA1 is a strong fit for automotive ECU power rails because its 4.75 V to 45 V input directly accepts 12 V battery voltage with full margin for cold-crank (down to ~6 V) and 24 V jump-start (up to ~36 V) transients. Its 1.8 A continuous output current can power a microcontroller, CAN transceiver, and several sensor ICs from a single rail. The AEC-Q100-grade automotive qualification, exposed-pad PG-DSO-8 thermal performance, and < 2 µA shutdown current also let it stay permanently connected to the battery without draining it. Typical topology is input LC pi-filter, 22 µH inductor, 22 µF X7R ceramic output cap, and 100 nF BST capacitor per the Infineon reference design.
Recommended
Body Control Module (BCM) Rails
Body control modules distribute power to door locks, lighting, mirror adjusters, and wiper motors, and the TLE8366EVXUMA1 can supply the BCM's logic rail from the 12 V battery. Its 45 V input withstands load-dump transients up to the ISO 7637-2 standard without additional TVS suppression for moderate-energy events. The 1.8 A output comfortably powers the BCM MCU plus peripheral sensors. The exposed pad PG-DSO-8 footprint is small enough for the dense BCM PCB, while the thermal pad keeps junction temperature in check at full load. Designers should pair it with a watchdog supervisor and add reverse-battery protection on VIN.
Recommended
Industrial 24 V Sensor Power
The TLE8366EVXUMA1 operates from 4.75 V to 45 V, which covers a nominal 24 V industrial bus with margin for the ±20 % tolerance and surge events common on factory floors. Its 1.8 A output can power a sensor cluster, signal-conditioning circuitry, and an isolated communications interface from a single regulated rail. The exposed-pad PG-DSO-8 package supports dense sensor-hub layouts where board area is at a premium. The < 2 µA shutdown current is also valuable for energy-harvesting or battery-backed sensor nodes. Use a pi-filter on the input to reject common-mode noise from the industrial bus.
Recommended
Instrument Cluster Power
Instrument clusters require clean, regulated power for the microcontroller, display drivers, and stepper motors that move gauge needles. The TLE8366EVXUMA1 provides a low-ripple 5 V or 3.3 V rail (depending on whether TLE8366EV50 or TLE8366EV33 is used instead) from the 12 V battery. Current-mode control delivers fast load-step response, important when stepper motors create sudden current demands. The exposed pad enables sustained operation across the automotive -40 °C to +85 °C ambient temperature range. A second stage LDO downstream cleans up any switching noise for the analog gauge drivers.
Recommended
HVAC Controller Power
HVAC controllers for cabin climate combine a microcontroller, multiple relay drivers, and sensor signal conditioning, all powered from the 12 V battery. The TLE8366EVXUMA1's wide input range tolerates cranking transients and jump-start events without input-side pre-regulation, and its 1.8 A output covers the entire HVAC controller load. The exposed-pad PG-DSO-8 package minimizes PCB area, important in the confined dashboard space. The enable pin allows the HVAC to be put into deep sleep with < 2 µA quiescent current when the vehicle is parked for long periods. The cycle-by-cycle current limit also protects against fan-motor inrush faults.
Recommended
Battery-Powered Portable Equipment
Although primarily aimed at automotive rails, the TLE8366EVXUMA1 is also useful in portable battery-powered equipment thanks to its 4.75 V to 45 V input range and < 2 µA shutdown current. It can directly accept multi-cell Li-ion stacks (4.2 V × N) or even a deeply discharged 12 V lead-acid battery. The 1.8 A output is enough to power a portable instrument, an e-bike display, or a battery-backed IoT gateway. The exposed pad PG-DSO-8 keeps the part cool under sustained 1.8 A load, and the integrated power switch eliminates the need for an external MOSFET. Use it ahead of a downstream LDO for the most noise-sensitive analog rails.
Recommended
Recommended Products Summary
Engineering reference data for TLE8366EVXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLE8366EV33XUMA1 | TLE8366EV50XUMA1 | TLE94110ESXUMA1 | SL8366 |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Slkor |
| Package | PG-DSO-8 (Exposed Pad) | PG-DSO-8 (Exposed Pad) - same | PG-DSO-8 (Exposed Pad) - same | PG-DSO-8 (Exposed Pad) - same | ESOP-8 (Exposed Pad) - same family |
| Topology | Buck (Step-Down) PWM | Buck PWM (same) | Buck PWM (same) | Half-bridge driver | Buck PWM (same) |
| Automotive Grade | Yes (AEC-Q100 targeted) | Yes | Yes | Yes | Yes (per datasheet claim) |
Key Differentiators
- Wide 45 V input withstands 24 V jump-start transients (vs SL8366 (42 V max))
- True adjustable output across full 0.6 V-16 V range (vs TLE8366EV50XUMA1)
- < 2 µA shutdown for permanent-battery connection (vs TLE8366EV33XUMA1)
Design Notes
The PG-DSO-8 exposed-pad package dissipates 1.8 A × (VIN - VOUT) of power as heat. At VIN=24 V, VOUT=5 V, 1 A load, dissipation is ~19 W - far above what the package can handle. Always limit the VIN-VOUT headroom or use the part at lower VIN (12 V nominal). At VIN=12 V, VOUT=5 V, 1.5 A load, dissipation is ~10.5 W, still requiring substantial copper pour on the EP. Add thermal vias under the exposed pad to inner ground planes.
Place the input ceramic bypass capacitor (typically 4.7 µF to 22 µF X7R) within 2 mm of the VIN and PGND pins to minimize switching-node ringing. The bootstrap capacitor (typically 100 nF X7R) must be placed close to the BST and SW pins. The exposed pad must be soldered to the PCB ground plane via an array of thermal vias for both electrical return and thermal dissipation. Keep the feedback trace away from the SW node and inductor to avoid noise coupling.
Do not operate the TLE8366EVXUMA1 above 45 V input, even transiently, or the internal switch may avalanche. Ensure the chosen inductor has a saturation current rating of at least 2.5 A (1.4× the 1.8 A nominal) to handle load transients. Avoid ceramic output capacitors below 22 µF unless the application is load-step tolerant - the part's current-mode control is stable but undershoots can occur with insufficient output capacitance. Always use the enable pin for power sequencing in multi-rail systems.
Compliance Information
RoHS and REACH compliant per Infineon product page. AEC-Q100 qualified for automotive use (per Infineon OPTIREG automotive-grade claim). Lead-free reflow-compatible. Halogen-free per JEDEC JS709B.
