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onsemi NCP5173MNR2
- Part No.:
- NCP5173MNR2
- Manufacturer:
- onsemi
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
NCP5173MNR2.pdf
- Description:
- IC REG BST FLYBACK ADJ 1.5A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
NCP5173MNR2 from onsemi is a 1.5 A, 560 kHz–1.0 MHz current-mode boost regulator IC with integrated NPN power switch, operating from 2.7 V to 30 V input and delivering regulated positive output voltage via external inductor/diode. It supports boost, flyback, SEPIC, forward, and inverting topologies and is used in flat-panel display power supplies requiring low-profile, high-frequency switching.
For engineers reviewing the NCP5173MNR2 datasheet, pinout, applications, or equivalent options, key selection considerations include its 1.276 V feedback reference, 50 µA shutdown current, thermal shutdown with 25°C hysteresis, frequency synchronization capability up to 1.0 MHz, and QFN-8 (5×6 mm) package with isolated thermal pad.
Technical Context
The NCP5173MNR2 implements peak-current-mode control using an internal 63 mΩ emitter-sense resistor and transconductance error amplifier (550 µS typ), enabling precise cycle-by-cycle current limiting and stable loop compensation. Its oscillator provides ±18% frequency accuracy at 560 kHz base, with programmable frequency shift down to 104 kHz under overload and external sync up to 1.0 MHz.
It integrates thermal shutdown (150°C trip, 25°C hysteresis), frequency foldback during overcurrent, soft-start via VC pin clamping, and dual ground separation (AGND for analog circuitry, PGND for high-current switch return), ensuring noise isolation and robust operation across automotive, industrial, and display power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 30 V - supports wide-input industrial and automotive supply rails without pre-regulation |
| Switch Current Limit | 1.5 A guaranteed - enables compact inductor selection for ≤1.5 A output in boost topology |
| Feedback Reference Voltage | 1.276 V ±2.7% - sets output regulation point with 0.03%/V line regulation for stable setpoint accuracy |
| Base Switching Frequency | 560 kHz ±18% - allows use of small, low-ESR ceramic capacitors and sub-10 mm inductors |
| Shutdown Current | ≤60 µA at VCC ≤30 V - ensures ultra-low quiescent power in standby mode for battery-backed systems |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - prevents latch-up and enables automatic recovery after cooling |
| Sync Frequency Range | 640 kHz to 1.0 MHz - enables EMI reduction via synchronized multi-rail power systems |
| Max Duty Cycle | 90% - supports high step-up ratios (e.g., 5 V → 24 V) in boost configuration |
Pinout & Package
Package: QFN-8 (5 mm × 6 mm, 1.0 mm max height), case 505AC, with electrically isolated thermal pad (not connected to IC substrate or pins).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Loop compensation & current limit control | Error amplifier output; clamped between 0.5 V and 1.7 V; external RC network sets compensation poles/zeros and adjusts current limit |
| 2 - FB | Positive voltage feedback input | Senses regulated output via resistive divider; 1.276 V reference; drops below 0.4 V to trigger 20% frequency foldback during startup/overload |
| 3 - Test | Internal test logic interface | Must be left floating or grounded; voltage 2.0–6.0 V disables oscillator and holds switch ON - not for normal operation |
| 4 - SS | Sync input / shutdown control | TTL-compatible: low = shutdown (≤60 µA); rising edge synchronizes oscillator up to 1.0 MHz |
| 5 - VCC | Power supply input | Supplies internal circuitry; requires local bypass capacitor to AGND; operates from 2.7 V to 30 V |
| 6 - AGND | Analog ground reference | Clean ground for error amp, FB, VC; connects to IC substrate; must be separated from high-current PGND path |
| 7 - PGND | Power switch emitter return | High-current ground for 1.5 A switch; connects to external ground plane; isolated from AGND to prevent noise coupling |
| 8 - VSW | Switch collector node | Connects to inductor/diode junction; withstands up to 40 V; trace must be short to minimize EMI and voltage spikes |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.5 A NPN switch | Eliminates external transistor and driver, reducing BOM count and PCB area in boost/flyback designs |
| Current-mode architecture | Enables inherent pulse-by-pulse current limiting, fast line/load transient response, and simplified loop compensation |
| Frequency foldback under overload | Reduces minimum duty cycle and switch stress during short-circuit or startup, improving reliability without external circuitry |
| Separate AGND and PGND pins | Prevents switching noise from corrupting feedback sensing, enabling stable regulation in noisy environments |
| Thermal shutdown with hysteresis | Guarantees safe thermal recovery (125°C re-enable) without oscillation or manual reset requirement |
| Low 1.0 mm profile QFN | Meets mechanical constraints in space-constrained applications like LCD backlight modules and portable displays |
Applications
| Flat Panel Display Power | Industrial DC-DC Conversion |
|---|---|
Use Scenario: Generating 24 V bias for TFT-LCD source drivers from a 5 V or 12 V rail in commercial monitors. IC Role / Device Role / Timing Role: Primary controller in non-isolated boost topology; regulates output via FB pin; switches at 560 kHz to minimize filter size. Use Value: Enables <10 mm² solution size with ceramic output caps and 4.7 µH inductor; 1.5 A switch supports up to 1.2 A load at 24 V. | Use Scenario: Providing isolated 15 V auxiliary supply for PLC I/O modules powered from 24 V field bus. IC Role / Device Role / Timing Role: Controller in flyback configuration; uses PGND/AGND separation and frequency sync to reduce EMI in dense control cabinets. Use Value: Wide 2.7–30 V input accommodates brownout conditions; thermal hysteresis prevents cycling during sustained overload. |
| Automotive Infotainment | Portable Medical Instrumentation |
Use Scenario: Boosting 9–16 V vehicle battery to 19 V for LCD backlight in head-unit displays. IC Role / Device Role / Timing Role: High-efficiency boost regulator with shutdown controlled by microcontroller via SS pin. Use Value: 50 µA shutdown current extends battery life in sleep mode; 150°C thermal shutdown meets AEC-Q100 ambient requirements. | Use Scenario: Generating stable 5 V rail from single-cell Li-ion (3.0–4.2 V) for portable ultrasound front-end ASICs. IC Role / Device Role / Timing Role: SEPIC converter for buck-boost operation; uses VC pin for soft-start to limit inrush into sensitive analog circuitry. Use Value: 1.276 V reference ensures ±1% output accuracy over temperature; low-profile QFN fits in handheld enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3478MM/NOPB | External MOSFET required; 1.25 V reference; no integrated thermal shutdown hysteresis; 1 MHz max frequency | Requires discrete high-side switch and separate thermal protection circuitry | Preferred when higher efficiency >90% is needed with synchronous rectification and lower RDS(on) MOSFETs |
| TPS40210DRCT | Current-mode controller only; no integrated switch; 1.22 V reference; supports up to 1.2 MHz sync | Needs external N-channel MOSFET and gate driver; broader VIN range (4.5–52 V) | Chosen for higher input voltage systems (>30 V) or where layout flexibility for discrete power stage is prioritized |
Compared with LM3478MM/NOPB and TPS40210DRCT, the NCP5173MNR2 delivers faster time-to-market for medium-power boost designs due to its fully integrated switch, built-in thermal protection, and minimal external component count - though it trades off maximum efficiency and input voltage headroom for integration density and ease of use.
Availability
NCP5173MNR2 is available at Aetrix Electronics and suitable for flat panel display power, industrial DC-DC conversion, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant QFN packaging.
Supply support for NCP5173MNR2 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP5173MNR2 belongs to onsemi's high-frequency DC-DC controller product line, designed specifically for compact, high-efficiency non-isolated and isolated power supplies in space- and thermal-constrained applications such as displays and portable electronics.
FAQ
What is the maximum output current supported by the NCP5173MNR2 in boost topology?
The NCP5173MNR2 integrates a 1.5 A guaranteed current-limit NPN switch. In boost configuration with typical layout and thermal management, it reliably delivers up to 1.2 A at 24 V output from a 12 V input. Peak switch current is limited to 1.5 A minimum (2.2 A max at 25°C), and actual output current depends on duty cycle, inductor DCR, diode VF, and thermal derating - full 1.5 A continuous output requires careful heatsinking and low-ESR components.
Does the NCP5173MNR2 support synchronous rectification?
No, the NCP5173MNR2 does not support synchronous rectification. It is designed for use with an external Schottky or ultrafast recovery diode in boost, flyback, and SEPIC topologies. The VSW pin drives the anode/cathode node of that diode, and the IC's internal NPN switch operates in standard asynchronous mode. Synchronous operation would require an external MOSFET gate driver and complementary control logic not present in the NCP5173MNR2.
How is thermal shutdown implemented in the NCP5173MNR2?
The NCP5173MNR2 features thermal shutdown with a 150°C trip point and 25°C hysteresis (re-enables at ~125°C). This is implemented via on-die temperature sensing and internal comparator circuitry - no external components are required. During thermal fault, the IC ceases switching, reduces ICC to ≤60 µA, and holds the power switch OFF until die temperature falls below the hysteresis threshold, ensuring safe automatic recovery without system intervention.
Can the NCP5173MNR2 be used in flyback topology with primary-side regulation?
Yes, the NCP5173MNR2 supports flyback topology with primary-side regulation. Its current-mode control, wide input range (2.7–30 V), and VSW rating up to 40 V allow direct connection to the primary winding. Regulation is achieved by reflecting output voltage to the FB pin via an auxiliary winding and resistive divider. The IC's frequency foldback and thermal shutdown enhance reliability during overload or short-circuit events common in flyback designs.
What is the purpose of the Test pin (Pin 3) on the NCP5173MNR2?
The Test pin (Pin 3) on the NCP5173MNR2 connects to internal factory test logic and is not intended for end-user functionality. It must be left floating or tied to AGND in normal operation. Applying 2.0–6.0 V to this pin disables the internal oscillator and forces the power switch into continuous conduction - a condition that can damage external components and must be avoided in deployed systems. No external circuitry should drive or load this pin.
NCP5173MNR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- 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):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 560kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (5x6)
NCP5173MNR2 FAQ
1.How can I place an order for NCP5173MNR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP5173MNR2 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 NCP5173MNR2 reliable?
The price and inventory of NCP5173MNR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP5173MNR2 is usually 5 days.
3.What payment methods are accepted for NCP5173MNR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP5173MNR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP5173MNR2?
NCP5173MNR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP5173MNR2 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 NCP5173MNR2?
For technical support, including NCP5173MNR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP5173MNR2 requirements.
6.How does Aetrix verify that NCP5173MNR2 is sourced from the original manufacturer or authorized distributors?
All NCP5173MNR2 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 NCP5173MNR2 meets industry standards.
7.What is the process for return or replacement of NCP5173MNR2?
All NCP5173MNR2 units undergo pre-shipment inspection (PSI). If there is an issue with NCP5173MNR2, 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 NCP5173MNR2 part is unused and in its original packaging.
Return procedure for NCP5173MNR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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