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onsemi NCV5171EDR2G
- Part No.:
- NCV5171EDR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCV5171EDR2G.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
NCV5171EDR2G from onsemi is an automotive-grade, current-mode boost switching regulator IC with integrated 1.5 A NPN power switch, 280 kHz fixed switching frequency, 2.7 V to 30 V input range, and 1.276 V precision feedback reference - designed for compact, high-efficiency DC-DC conversion in vehicle infotainment power rails, LED driver bias supplies, and body control module auxiliary rails.
For engineers reviewing the NCV5171EDR2G datasheet, pinout, applications, or equivalent options, key selection considerations include its AEC-Q100 qualification, thermal shutdown with hysteresis, frequency foldback under overload, external synchronization capability, and pin-to-pin compatibility with LT1372 for drop-in replacement in legacy designs.
Technical Context
The NCV5171EDR2G implements peak-current-mode control using an internal 63 mΩ emitter-sense resistor and transconductance error amplifier (550 μS typ) referenced to a 1.276 V bandgap. Its oscillator is trimmed to ±18% accuracy at 280 kHz and supports external sync up to 500 kHz via the SS pin.
It integrates frequency shift (to 52 kHz min) when FB falls below 0.4 V, enabling safe startup and short-circuit recovery; soft-start is implemented via VC pin clamping and external RC network; thermal shutdown activates at 180°C with 25°C hysteresis, and PGND/AGND separation isolates switching noise from analog circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 1.5 A guaranteed - enables direct driving of medium-power boost stages without external MOSFETs |
| Input Voltage Range | 2.7 V to 30 V - supports cold-crank (≥4.5 V) and load-dump (≤40 V transient) conditions in automotive systems |
| Switching Frequency | 280 kHz nominal - balances EMI performance and inductor size for space-constrained modules |
| Feedback Reference | 1.276 V ±2.7% - provides stable output regulation across −40°C to +125°C junction temperature |
| Shutdown Current | ≤60 µA at 30 V VCC - ensures ultra-low quiescent consumption during vehicle sleep mode |
| Thermal Shutdown | 180°C activation with 25°C hysteresis - prevents latch-up and enables automatic recovery after fault clearance |
| Max VSW Rating | 40 V - accommodates boost outputs up to ~39.5 V with Schottky diode (0.5 V VF) |
Pinout & Package
NCV5171EDR2G is housed in an SOIC-8 (Case 751) Pb-free package with exposed thermal pad (not electrically connected), optimized for automotive PCB layouts requiring creepage/clearance compliance and thermal dissipation up to 1.2 W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Loop compensation & current limit control | Output of transconductance error amplifier; clamped 0.5–1.7 V; sets soft-start time and peak switch current via external RC |
| 2 - FB | Positive voltage feedback input | Senses regulated output via resistive divider; triggers 5× frequency reduction when <0.4 V for overload protection |
| 3 - Test | Internal test logic interface | Must be left floating or grounded; applying 2–6 V disables oscillator and holds switch ON - not for normal operation |
| 4 - SS | Sync input / shutdown control | TTL-compatible: low = shutdown (≤60 µA IQ); rising edge synchronizes to external clock up to 500 kHz |
| 5 - VCC | Main power supply input | Accepts 2.7–30 V; requires local 1 µF ceramic bypass to AGND; powers internal LDO and gate driver |
| 6 - AGND | Analog ground reference | Clean return for FB, VC, and error amp; must be star-connected away from power currents to avoid noise coupling |
| 7 - PGND | Power ground return | High-current path for switch emitter; connects to PCB ground plane under IC for minimal loop inductance |
| 8 - VSW | Switch collector node | Drives external inductor/diode; withstands 40 V; layout demands shortest possible trace to reduce EMI and voltage spikes |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN switch | Eliminates external transistor and drive circuitry - reduces BOM count and layout area by ≥4 components |
| Current-mode architecture | Enables inherent cycle-by-cycle current limiting and fast line/load transient response without external compensation |
| Frequency foldback | Reduces minimum duty cycle during overloads - protects inductor, diode, and IC from thermal stress without external circuitry |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C operation with PPAP support - meets functional safety requirements for ASIL-B systems |
| Pin-to-pin compatible with LT1372 | Enables direct upgrade path from industrial LT1372 designs to automotive-qualified NCV5171EDR2G with no PCB change |
Applications
| Automotive Infotainment Power Supply | LED Backlight Bias Rail |
|---|---|
|
Use Scenario: Generating 12 V/1.2 A from 5 V USB-C or 12 V battery rail to power LCD display controllers and audio amplifiers in head units. IC Role / Device Role / Timing Role: Primary boost controller managing dynamic load steps (e.g., screen brightness changes) with <100 µs response and <50 mV overshoot. Use Value: Integrated current limit and thermal shutdown prevent damage during hot-plug events or display cable shorts - eliminating need for external fuse or resettable PTC. |
Use Scenario: Providing constant-current bias for 4–6 series white LEDs in instrument cluster backlighting, operating from 8–16 V vehicle battery. IC Role / Device Role / Timing Role: Regulated current source via FB-controlled PWM dimming; frequency synchronized to system clock to suppress beat-frequency EMI. Use Value: 280 kHz operation allows use of ≤10 µH shielded inductors and 22 µF ceramic output caps - achieving <1 mm profile in tight dashboard space. |
| Body Control Module Auxiliary Rail | Telematics GPS/GLONASS LNA Supply |
|
Use Scenario: Deriving isolated 3.3 V/500 mA rail from 12 V battery for microcontroller peripherals, CAN transceivers, and sensor interfaces in door modules. IC Role / Device Role / Timing Role: High-efficiency boost converter with shutdown controlled by MCU GPIO to meet ISO 16750-2 sleep current targets (<100 µA). Use Value: 60 µA shutdown current and wide VIN ensure compliance with OEM battery drain specs over 10-year vehicle life. |
Use Scenario: Generating clean 3.0 V/200 mA supply for GPS front-end low-noise amplifier (LNA), where RF sensitivity degrades with >10 µV RMS ripple. IC Role / Device Role / Timing Role: Low-noise boost regulator with AGND/PGND separation and VC-based loop compensation to achieve <30 µV RMS output ripple. Use Value: Internal 1.276 V reference stability (±0.03%/V line regulation) maintains LNA gain accuracy across battery voltage swings (9–16 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1372CS8#PBF | Same pinout, 1.5 A switch, 250 kHz base frequency; lacks AEC-Q100 qualification and automotive temp range (−40°C to +85°C only) | Valid for industrial/commercial designs but not automotive production; no PPAP documentation or extended temperature validation | Select NCV5171EDR2G for new automotive programs; LT1372CS8#PBF only for non-automotive prototyping or legacy board reuse |
| TPS61088RHLR | 5.5 V max VIN, 12 A switch, 500 kHz/1 MHz selectable; no sync/shutdown pin, different compensation scheme, QFN-20 package | Targeted at high-current portable electronics (e.g., tablets); incompatible pinout and control interface - requires full schematic/layout redesign | Not a drop-in alternative; consider only if redesigning for higher current or lower VIN; NCV5171EDR2G remains optimal for 2.7–30 V automotive boost |
Compared with LT1372CS8#PBF, NCV5171EDR2G adds automotive qualification and extended temperature operation at identical footprint; versus TPS61088RHLR, it trades higher current capability for broader VIN range, smaller package, and automotive-compliant features - making it the sole qualified solution for 280 kHz boost in vehicle ECUs.
Availability
NCV5171EDR2G is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and telematics hardware requiring stable component supply across multi-year production cycles and stringent automotive quality standards.
Supply support for NCV5171EDR2G 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
onsemi is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - with leadership in power management, imaging, and intelligent sensing.
The NCV5171EDR2G belongs to onsemi's automotive-qualified power management portfolio, engineered specifically for robust, high-reliability DC-DC conversion in harsh-temperature vehicle subsystems where AEC-Q100 compliance and long-term supply assurance are mandatory.
FAQ
What is the maximum output voltage achievable with NCV5171EDR2G in boost topology?
The NCV5171EDR2G supports VSW up to 40 V, so maximum regulated output voltage depends on the external Schottky diode forward voltage (typically 0.5 V). For example, with a 0.5 V VF diode, the practical maximum output is 39.5 V. Layout parasitics and transient spikes must remain within this rating - use TVS clamping if output exceeds 36 V under load dump conditions. The NCV5171EDR2G itself does not regulate beyond its VSW absolute maximum.
Does NCV5171EDR2G require an external bootstrap capacitor?
No, the NCV5171EDR2G does not require a bootstrap capacitor because it uses a grounded-emitter NPN power switch driven directly by an internal bipolar driver stage - unlike high-side NMOS controllers. The VCC pin supplies all internal circuitry including the gate driver, and no floating voltage rail is needed. This simplifies design and eliminates bootstrap diode/capacitor placement constraints common in MOSFET-based regulators.
Can NCV5171EDR2G operate in discontinuous conduction mode (DCM)?
Yes, the NCV5171EDR2G operates reliably in both continuous (CCM) and discontinuous conduction modes. Its current-mode control inherently adapts to DCM transitions - the peak current limit remains active, and frequency foldback engages below 0.4 V on FB to maintain stability during light loads or startup. Typical DCM operation occurs below ~150 mA output current at 12 V input/24 V output, depending on inductor value and switching frequency.
How is soft-start implemented on NCV5171EDR2G?
Soft-start on the NCV5171EDR2G is implemented via the VC pin: an external RC network (e.g., 5 kΩ + 0.01 µF) between VC and AGND controls ramp rate. As VC charges, it limits peak switch current and gradually increases duty cycle - preventing inrush into output capacitors. The internal VC clamp (0.5–1.7 V) and transconductance amplifier define the soft-start duration. No dedicated SS pin function is used; soft-start is intrinsic to VC-based loop compensation.
Is NCV5171EDR2G compatible with ceramic output capacitors?
Yes, the NCV5171EDR2G is fully compatible with low-ESR ceramic output capacitors. Its current-mode control and VC-based compensation allow stable operation with 10–47 µF X7R/X5R ceramics - provided the zero from R1–C1 network is placed near the ESR zero of the output cap (typically ~100 kHz for 22 µF/10 mΩ). Ceramic use reduces output ripple, improves transient response, and avoids electrolytic aging issues critical for 15-year automotive service life.
NCV5171EDR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Flyback, Forward Converter, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.276V
- Voltage - Output (Max):
- 28.2V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 280kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
NCV5171EDR2G FAQ
1.How can I place an order for NCV5171EDR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV5171EDR2G 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 NCV5171EDR2G reliable?
The price and inventory of NCV5171EDR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV5171EDR2G is usually 5 days.
3.What payment methods are accepted for NCV5171EDR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV5171EDR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV5171EDR2G?
NCV5171EDR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV5171EDR2G 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 NCV5171EDR2G?
For technical support, including NCV5171EDR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV5171EDR2G requirements.
6.How does Aetrix verify that NCV5171EDR2G is sourced from the original manufacturer or authorized distributors?
All NCV5171EDR2G 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 NCV5171EDR2G meets industry standards.
7.What is the process for return or replacement of NCV5171EDR2G?
All NCV5171EDR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCV5171EDR2G, 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 NCV5171EDR2G part is unused and in its original packaging.
Return procedure for NCV5171EDR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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