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Infineon Technologies IFX80471SKV50XUMA1
- Part No.:
- IFX80471SKV50XUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
IFX80471SKV50XUMA1.pdf
- Description:
- IC REG CTRLR BUCK 14DSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
IFX80471SKV50XUMA1 from Infineon Technologies is a fixed 5V step-down DC/DC controller driving an external P-channel MOSFET, supporting input voltages up to 60V, delivering up to 2.3A output current with ±3% output voltage accuracy, 360kHz fixed switching frequency, and integrated undervoltage reset (4.5–4.8V threshold) for automotive power rail monitoring.
For engineers reviewing the IFX80471SKV50XUMA1 datasheet, IFX80471SKV50XUMA1 pinout, IFX80471SKV50XUMA1 application, or IFX80471SKV50XUMA1 equivalent, key selection criteria include its 100% duty-cycle capability for low-dropout operation, SI_ENABLE-controlled SI_GND switching for battery-sense flexibility, SO/RO open-drain outputs with internal 20kΩ pull-up to VOUT, and PG-DSO-14 package compatibility with high-temperature (-40°C to +125°C) automotive environments.
Technical Context
The IFX80471SKV50XUMA1 implements a current-mode PWM/PFM hybrid control architecture that enables seamless transition between pulse-frequency modulation at light loads (quiescent current <120µA) and pulse-width modulation at higher loads-eliminating minimum load requirements while maintaining regulation across 1mA–2.3A. Its internal oscillator is fixed at 360kHz but can be synchronized externally via the SYNC pin.
It integrates dual comparators: one (SI/SI_GND/SO) for configurable low-battery sensing referenced to 1.25V, and another (FB/RO) for output undervoltage reset with 50mV hysteresis. The RO output is internally pulled up to VOUT (5V) via 20kΩ, enabling direct interfacing with microcontroller reset inputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±3% - eliminates external feedback divider, simplifies BOM and layout for stable 5V rail generation. |
| Input Voltage Range | 5V to 60V - supports wide automotive battery transients including cold-crank (6.5V) and load-dump (60V). |
| Max Output Current | 2.3A - defines maximum continuous load capability when paired with appropriately rated external P-MOSFET and passive components. |
| Switching Frequency | 360kHz fixed - enables use of compact surface-mount inductors (~2.2µH typical) and reduces EMI filter size. |
| UVLO Reset Threshold | 4.5V–4.8V with 50mV hysteresis - ensures reliable microcontroller reset assertion during brown-out conditions on 5V rail. |
| Quiescent Current | <120µA - maintains efficiency at light loads (e.g., vehicle sleep mode), minimizing standby power loss. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test requirements. |
Pinout & Package
IFX80471SKV50XUMA1 is housed in a PG-DSO-14 (Plastic Dual Small Outline) package, thermally enhanced with exposed pad, RoHS-compliant, and rated for industrial and automotive temperature ranges.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SI_ENABLE | Active-high enable for SI_GND switch | Controls connection of SI_GND to GND; when low, SI_GND floats-enabling flexible battery-sense resistor network configuration. |
| 2 FB | Internal feedback node | Internally connected to 5V output via precision divider; no external connection required-reduces component count and layout sensitivity. |
| 3 VOUT | Buck output voltage sense & bias supply | Provides internal bias for regulators and references; must connect directly to output capacitor for stability and accurate reset monitoring. |
| 4 GND | Analog ground reference | Primary signal return for feedback, sense, and comparator circuits-requires low-impedance connection to power ground plane. |
| 5 SYNC | External clock synchronization input | Accepts TTL/CMOS clock signal to lock switching frequency-critical for noise-sensitive systems or multi-regulator EMI coordination. |
| 6 SI_GND | Switchable ground for SI comparator | Connected to GND only when SI_ENABLE = high; allows shared resistor divider between multiple battery-sense channels. |
| 7 SI | Sense comparator input | Compares external voltage (e.g., battery tap) against internal 1.25V reference-SO asserts low when input falls below threshold. |
| 8 COMP | Loop compensation node | Connects RC network to GND to stabilize control loop-determines phase margin and transient response of buck regulator. |
| 9 SO | Sense comparator open-drain output | Pulled up to VOUT (5V) via 20kΩ; sinks current when SI < 1.25V-directly drives MCU interrupt or status LED. |
| 10 RO | Reset comparator open-drain output | Pulled up to VOUT (5V) via 20kΩ; asserts low when VOUT drops below 4.5–4.8V-meets standard µC reset timing requirements. |
| 11 BDS | Buck driver supply | Provides clamped gate-source voltage for P-MOSFET drive; requires ceramic capacitor to VS for charge reservoir and noise suppression. |
| 12 GDRV | Gate drive output | Swings between VS and BDS to fully enhance P-MOSFET; peak current limited internally-no external gate resistor needed. |
| 13 VS | Main supply input | Accepts 5–60V input; requires local 220nF ceramic + bulk tantalum capacitor-ensures low-impedance path for high di/dt switching currents. |
| 14 CS | Current sense input | Monitors voltage drop across external sense resistor between VS and CS-sets peak current limit and enables cycle-by-cycle overcurrent protection. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout voltage as low as RDS(on) × ILOAD, critical for maintaining 5V output during cold-crank (6.5V input) in automotive systems. |
| Integrated undervoltage reset (RO) | Eliminates need for external reset IC-reduces BOM cost and PCB area while ensuring deterministic reset behavior tied directly to regulated 5V rail. |
| SI_ENABLE-controlled SI_GND | Allows dynamic reconfiguration of battery-sense networks-supports multi-battery monitoring or shared divider topologies without additional switches. |
| Current-mode PWM/PFM control | Reduces light-load quiescent current to <120µA while preserving fast transient response-ideal for always-on vehicle modules with strict sleep-current budgets. |
| Thermal shutdown & overcurrent protection | Internally monitors junction temperature and peak switch current-prevents destructive failure during overload or thermal runaway without external circuitry. |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Supply |
|---|---|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in door modules, seat controllers, and lighting nodes. IC Role / Device Role / Timing Role: Primary 5V system rail controller with integrated reset and battery monitoring for fault-tolerant operation. Use Value: Enables single-chip 5V generation with validated UVLO reset and SI-based battery state-of-charge indication-reducing component count by ≥3 vs. discrete solutions. | Use Scenario: Providing clean, regulated 5V to display drivers, audio codecs, and USB peripherals in head units and digital clusters. IC Role / Device Role / Timing Role: High-efficiency buck controller with SYNC input for EMI-controlled switching aligned to display refresh cycles. Use Value: Fixed 5V output and 360kHz frequency allow optimized LC filter design-meeting CISPR-25 Class 5 radiated emissions limits without shielding. |
| ADAS Camera Power Management | Commercial Vehicle Telematics Unit |
Use Scenario: Delivering stable 5V to image sensors and ISP processors in rear-view and surround-view camera modules. IC Role / Device Role / Timing Role: Input-transient-hardened DC/DC controller with 60V max rating and -40°C to +125°C operation. Use Value: Withstands 60V load-dump pulses per ISO 7637-2 Pulse 5a-eliminating need for upstream TVS or active clamp circuits. | Use Scenario: Powering GPS/GNSS receivers, cellular modems, and data loggers in fleet management telematics boxes. IC Role / Device Role / Timing Role: Low-quiescent-current 5V supply with SI_ENABLE-gated battery sense for battery-backed memory and real-time clock supervision. Use Value: <120µA IQ and programmable SI_GND enable >1-year backup runtime on coin-cell-meeting EN 50155 long-term storage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | Wide-input (3–65V) synchronous buck controller with integrated high-side FET driver; requires external low-side MOSFET; no integrated reset or battery sense. | Lacks RO/SO comparators-requires external reset IC and voltage monitor for equivalent functionality. | Choose when synchronous rectification is mandatory for >90% efficiency at full load, and external monitoring is acceptable. |
| TPS54240DGQR | 3.5–40V adjustable-output buck controller; 2.5A max; no integrated reset or battery sense; 2.2MHz max frequency. | Lower max input voltage (40V vs. 60V); no SI/SO/RO functions-unsuitable for load-dump hardened or battery-monitoring designs. | Choose for cost-sensitive non-automotive applications where 40V input ceiling and absence of monitoring features are acceptable. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, IFX80471SKV50XUMA1 uniquely integrates 5V-fixed regulation, automotive-grade 60V input tolerance, dual comparators (SO/RO), and SI_ENABLE-controlled grounding-reducing total solution size and validation effort for safety-critical 5V rails.
Availability
IFX80471SKV50XUMA1 is available at Aetrix Electronics and suitable for automotive body electronics, infotainment power supplies, ADAS camera modules, and commercial vehicle telematics requiring stable component supply across extended temperature and high-reliability environments.
Supply support for IFX80471SKV50XUMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and qualification to AEC-Q100 and IATF 16949 standards.
The IFX80471 product line delivers highly integrated step-down controllers for automotive power systems-designed specifically to replace discrete regulator + monitor + reset solutions in body, chassis, and infotainment domains.
FAQ
What is the purpose of the SI_ENABLE pin on IFX80471SKV50XUMA1?
The SI_ENABLE pin controls the internal switch connecting SI_GND to system ground. When high, SI_GND is actively pulled to GND, completing the voltage divider for the SI comparator. When low, SI_GND floats-allowing shared resistor networks across multiple battery-sense inputs or enabling selective channel activation in multi-rail systems.
Can IFX80471SKV50XUMA1 operate with input voltage below 5V?
No. The device requires a minimum input voltage of 5V to ensure proper internal biasing and regulation. Operation below 5V will result in loss of output regulation, disabled reset functionality, and undefined behavior on SO and RO outputs-per Absolute Maximum Ratings section 4.1.1.
How does the RO output behave during startup and fault conditions?
RO is an open-drain output pulled up to VOUT (5V) via an internal 20kΩ resistor. It remains high until VOUT reaches ≥4.8V, then stays high as long as VOUT stays above 4.5V. During startup, RO asserts low until VOUT stabilizes; during undervoltage, it pulls low again-providing clean, hysteresis-filtered reset signaling without external components.
Is external compensation required for stable operation?
Yes. A Type II compensation network (resistor + capacitor + optional second capacitor) must be connected between COMP and GND. The values depend on output capacitance, inductance, and desired phase margin-typical design uses 10kΩ, 1nF, and 100pF per Figure 21 in the datasheet to achieve ≥45° phase margin across 1mA–2.3A load range.
IFX80471SKV50XUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 5V ~ 60V
- Frequency - Switching:
- 360kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Reset
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-DSO-14-1
IFX80471SKV50XUMA1 FAQ
1.How can I place an order for IFX80471SKV50XUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for IFX80471SKV50XUMA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IFX80471SKV50XUMA1 reliable?
The price and inventory of IFX80471SKV50XUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IFX80471SKV50XUMA1 is usually 5 days.
3.What payment methods are accepted for IFX80471SKV50XUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IFX80471SKV50XUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IFX80471SKV50XUMA1?
IFX80471SKV50XUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IFX80471SKV50XUMA1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IFX80471SKV50XUMA1?
For technical support, including IFX80471SKV50XUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IFX80471SKV50XUMA1 requirements.
6.How does Aetrix verify that IFX80471SKV50XUMA1 is sourced from the original manufacturer or authorized distributors?
All IFX80471SKV50XUMA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IFX80471SKV50XUMA1 meets industry standards.
7.What is the process for return or replacement of IFX80471SKV50XUMA1?
All IFX80471SKV50XUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with IFX80471SKV50XUMA1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IFX80471SKV50XUMA1 part is unused and in its original packaging.
Return procedure for IFX80471SKV50XUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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