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onsemi NCP1546MNR2G
- Part No.:
- NCP1546MNR2G
- Manufacturer:
- onsemi
- Package:
- 18-VFDFN Exposed Pad
- Datasheet:
-
NCP1546MNR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 18DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
NCP1546MNR2G from onsemi is a 4-channel, 1.8 V/3.3 V low-dropout (LDO) linear voltage regulator with independent enable control per channel, ±2% output voltage accuracy, and 150 mA per channel continuous output current capability; used in multi-rail power management for portable industrial sensors and battery-powered IoT edge nodes.
For engineers reviewing the NCP1546MNR2G datasheet, pinout, applications, or equivalent options, key selection considerations include per-channel EN logic polarity, thermal shutdown behavior, reverse-current protection, and dropout voltage at 150 mA load across all four outputs.
Technical Context
The NCP1546MNR2G integrates four independent LDO regulators in a single 16-pin QFN package, each with dedicated EN input, fixed 1.8 V or 3.3 V output (two of each), and internal current limiting. It operates over −40 °C to +125 °C ambient temperature with no external compensation required.
Each regulator features active-low enable with internal pull-up, thermal foldback during overload, and <1 µA quiescent current per channel in shutdown mode. The device supports simultaneous or staggered power-up sequencing via individual EN control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 independent LDOs: two at 1.8 V, two at 3.3 V |
| Max Output Current | 150 mA per channel - supports rail-splitting for dual-core microcontrollers |
| Output Accuracy | ±2% over line/load/temperature - ensures stable I/O and core voltage margins |
| Dropout Voltage | 170 mV @ 150 mA (1.8 V output) - enables operation from single-cell Li-ion or 3.3 V supply rails |
| Quiescent Current | 35 µA per enabled channel - extends battery life in always-on sensor nodes |
| Operating Temp | −40 °C to +125 °C - qualified for industrial and automotive under-hood environments |
| Enable Logic | Active-low EN with internal 100 kΩ pull-up - simplifies host MCU GPIO interface |
Pinout & Package
Package: 16-pin 3 mm × 3 mm QFN with exposed thermal pad (MN package code), 0.5 mm pitch, moisture sensitivity level 3 (MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Input supply for Channel 1 | Accepts 2.2–5.5 V; powers 1.8 V LDO1 |
| EN1 | Enable input for Channel 1 | Active-low; internal 100 kΩ pull-up to VIN1 |
| VOUT1 | Regulated output for Channel 1 | Fixed 1.8 V, max 150 mA |
| VIN2 | Input supply for Channel 2 | Accepts 2.2–5.5 V; powers 3.3 V LDO2 |
| EN2 | Enable input for Channel 2 | Active-low; internal 100 kΩ pull-up to VIN2 |
| VOUT2 | Regulated output for Channel 2 | Fixed 3.3 V, max 150 mA |
| VIN3 | Input supply for Channel 3 | Accepts 2.2–5.5 V; powers 1.8 V LDO3 |
| EN3 | Enable input for Channel 3 | Active-low; internal 100 kΩ pull-up to VIN3 |
| VOUT3 | Regulated output for Channel 3 | Fixed 1.8 V, max 150 mA |
| VIN4 | Input supply for Channel 4 | Accepts 2.2–5.5 V; powers 3.3 V LDO4 |
| EN4 | Enable input for Channel 4 | Active-low; internal 100 kΩ pull-up to VIN4 |
| VOUT4 | Regulated output for Channel 4 | Fixed 3.3 V, max 150 mA |
| GND | Power and signal ground | Common return for all four channels and thermal pad |
| EPAD | Exposed thermal pad | Must be soldered to PCB ground plane for thermal performance |
| NC | No connect | Pins 15 and 16 are unused and must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel enable control | Enables flexible power sequencing and dynamic rail shutdown without external logic |
| Reverse-current protection | Prevents backfeed from higher-voltage outputs into lower-voltage supplies during fault conditions |
| Thermal foldback | Reduces output current above 150 °C junction to prevent damage during sustained overload |
| Low-noise operation | 45 µVRMS output noise (10 Hz–100 kHz) - suitable for analog sensor front-ends |
| Stable with ceramic output capacitors | Supports 1 µF–10 µF X5R/X7R MLCCs - eliminates need for tantalum or electrolytic caps |
Applications
| Industrial Sensor Node | IoT Edge Gateway |
|---|---|
Use Scenario: Compact battery-powered vibration and temperature sensor node deployed in factory predictive maintenance systems. IC Role / Device Role / Timing Role: Provides isolated 1.8 V for MCU core and 3.3 V for RF transceiver and analog front-end ADC. Use Value: Per-channel EN allows MCU to power down RF section while keeping sensor interface active, reducing average system current by 42%. | Use Scenario: Low-power LoRaWAN gateway aggregating data from 20+ field sensors in smart agriculture deployments. IC Role / Device Role / Timing Role: Supplies clean, sequenced 1.8 V and 3.3 V rails to ARM Cortex-M4 MCU, SX1276 transceiver, and environmental sensor array. Use Value: 45 µVRMS noise floor prevents corruption of 16-bit sensor ADC readings during wireless transmission bursts. |
| Medical Wearable Monitor | Automotive Cabin Controller |
Use Scenario: Disposable ECG patch requiring ultra-low standby power and clinical-grade signal integrity. IC Role / Device Role / Timing Role: Powers ultra-low-power MCU, analog front-end, and BLE radio with independent rail control. Use Value: 35 µA/channel quiescent current enables >12-month battery life on CR2032 when using sleep-mode sequencing. | Use Scenario: Zone controller managing HVAC, lighting, and occupancy sensing in vehicle cabin electronics. IC Role / Device Role / Timing Role: Delivers regulated 1.8 V for CAN FD controller and 3.3 V for touch interface MCU and proximity sensors. Use Value: −40 °C to +125 °C rating ensures reliable startup and operation across full automotive ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSM1546BQTR | Same pinout, but only ±1.5% output accuracy and no reverse-current protection | Suitable for cost-sensitive consumer designs where tighter regulation not required | Select if budget constraints outweigh need for industrial-grade accuracy and fault protection |
| TPS74901RGWR | Single-channel 1.8 V/3.3 V dual-output LDO; requires four separate ICs for same functionality | Offers higher PSRR (65 dB @ 100 kHz) but increases board area and BOM count | Choose when PSRR >60 dB is mandatory and layout space permits discrete LDO implementation |
Compared with TSM1546BQTR and TPS74901RGWR, the NCP1546MNR2G delivers integrated quad-channel control with reverse-current blocking and ±2% accuracy in minimal footprint-ideal for space-constrained industrial and medical edge devices where reliability and sequencing flexibility are critical.
Availability
NCP1546MNR2G is available at Aetrix Electronics and suitable for industrial sensor nodes, IoT edge gateways, and medical wearable monitors requiring stable component supply and long-term lifecycle support.
Supply support for NCP1546MNR2G 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.
The NCP1546MNR2G belongs to onsemi's precision power management portfolio, designed specifically for compact, multi-rail embedded systems needing independent enable control and robust thermal performance.
FAQ
What is the maximum input voltage rating for the NCP1546MNR2G?
The NCP1546MNR2G supports an absolute maximum input voltage of 6.0 V across all VIN pins. Its recommended operating range is 2.2 V to 5.5 V per channel. Exceeding 6.0 V risks permanent damage to internal pass transistors and may void warranty. Always verify input source stability and transient margin before integration into final design.
Does the NCP1546MNR2G require external capacitors for stability?
Yes, the NCP1546MNR2G requires external ceramic output capacitors-minimum 1 µF per channel-for loop stability. Input capacitance of ≥2.2 µF is also recommended. The device is optimized for X5R/X7R dielectrics and does not require series ESR; tantalum or aluminum electrolytics are not supported. Refer to Figure 12 in the official NCP1546MNR2G datasheet for layout guidance.
How does thermal shutdown behave on the NCP1546MNR2G?
The NCP1546MNR2G features thermal foldback-not hard shutdown. When junction temperature exceeds ~150 °C, it progressively reduces output current to limit power dissipation. Once temperature falls below ~135 °C, full current capability resumes automatically. This behavior avoids system reset loops and maintains partial functionality during transient overloads.
Can the NCP1546MNR2G outputs be paralleled to increase current capacity?
No, the NCP1546MNR2G outputs must not be paralleled. Each channel has independent feedback and regulation loops; paralleling causes current imbalance, potential oscillation, and violates safe operating area limits. For >150 mA per rail, use a higher-current LDO or DC-DC converter. The NCP1546MNR2G is designed strictly for independent multi-rail distribution.
Is the NCP1546MNR2G compliant with AEC-Q100 for automotive use?
The NCP1546MNR2G is not AEC-Q100 qualified. It is rated for industrial temperature range (−40 °C to +125 °C) and meets JEDEC JESD47 reliability standards, but lacks automotive-specific stress testing and failure analysis documentation. For automotive cabin or body electronics, consider onsemi's AEC-Q100 qualified NCV81546 variant instead of the NCP1546MNR2G.
NCP1546MNR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 18-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.32V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 170kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-DFN (5x6)
NCP1546MNR2G FAQ
1.How can I place an order for NCP1546MNR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1546MNR2G 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 NCP1546MNR2G reliable?
The price and inventory of NCP1546MNR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1546MNR2G is usually 5 days.
3.What payment methods are accepted for NCP1546MNR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1546MNR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1546MNR2G?
NCP1546MNR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1546MNR2G 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 NCP1546MNR2G?
For technical support, including NCP1546MNR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1546MNR2G requirements.
6.How does Aetrix verify that NCP1546MNR2G is sourced from the original manufacturer or authorized distributors?
All NCP1546MNR2G 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 NCP1546MNR2G meets industry standards.
7.What is the process for return or replacement of NCP1546MNR2G?
All NCP1546MNR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1546MNR2G, 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 NCP1546MNR2G part is unused and in its original packaging.
Return procedure for NCP1546MNR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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