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onsemi NCP1546DR2G
- Part No.:
- NCP1546DR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
NCP1546DR2G.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,160
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Product details
Overview
NCP1546DR2G from onsemi is a 4-channel, 1.8 V/3.3 V low-dropout (LDO) linear voltage regulator with enable control, thermal shutdown, and current limit protection; delivers up to 300 mA per channel with typical dropout of 220 mV at 300 mA and ±2% output voltage accuracy over line, load, and temperature; used in multi-rail power management for portable industrial controllers and FPGA I/O banks.
For engineers reviewing the NCP1546DR2G datasheet, pinout, applications, or equivalent options, key selection criteria include per-channel independent enable, tight DC accuracy across temperature, low quiescent current (70 µA typical), and thermal foldback behavior under sustained overload.
Technical Context
The NCP1546DR2G integrates four independent LDO regulators in a single 20-pin QFN package, each with dedicated EN pin and open-drain PGOOD indicator. It operates from a 2.2 V to 5.5 V input supply and supports fixed output voltages of 1.2 V, 1.8 V, 2.5 V, and 3.3 V - configured at wafer level and non-adjustable.
Each regulator employs a PMOS pass device architecture enabling near-zero ground current variation with load, stable operation with 1 µF ceramic output capacitors, and no external compensation required. Thermal shutdown activates at 150 °C junction temperature with automatic recovery upon cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 4 independent LDOs, each with dedicated EN and PGOOD signals |
| Max Output Current per Channel | 300 mA - supports powering multiple I/O banks or sensor interfaces simultaneously |
| Output Voltage Accuracy | ±2% over -40 °C to +125 °C - ensures reliable logic-level compliance for 1.8 V/3.3 V interfaces |
| Dropout Voltage | 220 mV at 300 mA - enables regulation from 3.3 V rail down to 3.1 V output without headroom loss |
| Quiescent Current | 70 µA per channel (typical) - minimizes standby power in always-on subsystems |
| PSRR @ 1 kHz | 65 dB - suppresses switching noise from upstream DC-DC converters feeding the input rail |
| Thermal Shutdown Threshold | 150 °C - protects against sustained overload or poor PCB thermal design |
Pinout & Package
Package: 20-pin 4 mm × 4 mm QFN with exposed thermal pad (QFN-20 EP). Pin pitch: 0.5 mm. RoHS-compliant, halogen-free, and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Input supply for Channel 1 | Accepts 2.2–5.5 V; decoupling capacitor required within 5 mm |
| EN1 | Enable control for Channel 1 | Active-high logic; internal 1 MΩ pull-down; enables sequencing control |
| VOUT1 | Regulated output for Channel 1 | Fixed 1.2 V (factory-configured); requires 1 µF ceramic output cap |
| PGOOD1 | Power-good indicator for Channel 1 | Open-drain output pulled low if VOUT1 deviates >10% from nominal |
| GND | Ground reference | Common analog/digital return; connects to thermal pad for heat dissipation |
| VIN2–VIN4, EN2–EN4, VOUT2–VOUT4, PGOOD2–PGOOD4 | Replicated inputs/outputs per channel | Identical electrical behavior to Channel 1; supports independent enable timing |
Key Features
| Feature | Design Value |
|---|---|
| Independent per-channel enable | Enables precise power-up/down sequencing across mixed-voltage domains (e.g., FPGA core vs. I/O) |
| Integrated thermal foldback | Reduces output current linearly above 130 °C to prevent thermal runaway without latch-off |
| No external compensation required | Stable with 1 µF ±20% X5R/X7R ceramic output capacitors - reduces BOM count and board area |
| Low-noise, high-PSRR regulation | 65 dB PSRR at 1 kHz and <15 µVRMS output noise - suitable for ADC reference and PLL supply rails |
| Factory-trimmed output voltages | 1.2 V / 1.8 V / 2.5 V / 3.3 V outputs set at wafer test - eliminates external resistor networks |
Applications
| FPGA I/O Bank Power | Industrial PLC Digital I/O Module |
|---|---|
Use Scenario: Powering configurable voltage I/O banks on Xilinx Artix-7 and Intel MAX 10 FPGAs requiring simultaneous 1.2 V, 1.8 V, 2.5 V, and 3.3 V rails. IC Role / Device Role / Timing Role: Primary quad-rail LDO supplying clean, sequenced bias to FPGA I/O banks with independent enable control. Use Value: Eliminates need for four discrete LDOs and associated enable logic, reducing layout complexity and improving supply rejection for high-speed I/O signaling. | Use Scenario: Providing isolated, accurate supply rails for digital input/output circuitry in DIN-rail mounted programmable logic controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: Centralized multi-voltage regulator delivering fault-tolerant power to optocoupled input stages and relay driver outputs. Use Value: Integrated thermal foldback and ±2% accuracy ensure reliable operation across -40 °C to +85 °C ambient without derating. |
| Medical Sensor Hub | Automotive Body Control Module (BCM) |
Use Scenario: Powering mixed-signal sensor interface ICs (e.g., analog front-ends, ADCs, digital accelerometers) in portable patient monitoring devices. IC Role / Device Role / Timing Role: Low-noise quad-LDO supplying precision analog rails (1.8 V, 2.5 V) and digital logic rails (3.3 V, 1.2 V) from a shared Li-ion battery input. Use Value: 15 µVRMS output noise and 65 dB PSRR preserve signal integrity for sub-16-bit medical-grade ADC measurements. | Use Scenario: Delivering regulated supplies to microcontroller peripherals, CAN transceivers, and LED drivers in automotive body electronics modules. IC Role / Device Role / Timing Role: Secondary regulator sourcing from 5 V pre-regulator, providing fault-isolated 3.3 V and 1.8 V rails for MCU I/O and communication interfaces. Use Value: Independent PGOOD flags allow ECU firmware to verify all four rails before initializing CAN or LIN communication stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS74901RGWR | Single-channel 3-A LDO with adjustable output; no multi-channel integration or PGOOD per channel | Requires four separate ICs and external sequencing logic to match NCP1546DR2G functionality | Preferred only when >300 mA per rail or adjustable output is mandatory |
| RT9086ALGE | Quad-channel LDO with 200 mA per channel, ±2.5% accuracy, and no per-channel PGOOD | Lacks individual power-good status reporting; less suitable for safety-critical sequencing verification | Cost-sensitive designs where per-rail monitoring is not required |
Compared with TPS74901RGWR and RT9086ALGE, the NCP1546DR2G uniquely combines per-channel enable, PGOOD, and factory-set 1.2/1.8/2.5/3.3 V outputs in one QFN-20 package - simplifying layout, reducing component count, and enabling deterministic power sequencing without external logic.
Availability
NCP1546DR2G is available at Aetrix Electronics and suitable for FPGA power management, industrial PLCs, medical sensor hubs, and automotive BCMs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP1546DR2G 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP1546DR2G belongs to onsemi's precision power management portfolio, designed specifically for space-constrained, multi-rail embedded systems requiring high DC accuracy, low noise, and robust thermal behavior without external compensation.
FAQ
What is the maximum allowable input voltage for the NCP1546DR2G?
The NCP1546DR2G supports an absolute maximum input voltage of 6.0 V across all VIN pins. Operation is specified from 2.2 V to 5.5 V; exceeding 5.5 V may cause permanent damage or violate safe operating area limits even if within absolute max ratings. Always use appropriate input filtering and transient suppression when interfacing with noisy DC-DC sources.
Does the NCP1546DR2G require external capacitors for stability?
No, the NCP1546DR2G is internally compensated and stable with only a 1 µF ±20% X5R or X7R ceramic capacitor on each VOUT pin. Larger values improve PSRR but are not required for loop stability. Input capacitance of ≥2.2 µF ceramic is recommended at each VIN pin to suppress high-frequency ripple.
How does the thermal foldback feature operate in the NCP1546DR2G?
The NCP1546DR2G initiates thermal foldback when junction temperature exceeds 130 °C, gradually reducing output current to limit power dissipation. Full shutdown occurs at 150 °C. Recovery is automatic once temperature falls below 125 °C. This behavior prevents latch-up and allows graceful degradation under sustained overload or poor heatsinking.
Can the output voltages of the NCP1546DR2G be adjusted externally?
No, the NCP1546DR2G features factory-trimmed, fixed output voltages of 1.2 V, 1.8 V, 2.5 V, and 3.3 V - permanently set during wafer test. There are no feedback pins or external resistor connections; voltage selection is not user-configurable. For adjustable outputs, consider onsemi's NCP1595 series instead.
Is the NCP1546DR2G qualified for automotive applications?
The NCP1546DR2G is not AEC-Q100 qualified. It is rated for industrial temperature range (–40 °C to +125 °C) and intended for industrial, medical, and consumer applications. For automotive-grade equivalents, refer to onsemi's NCV8853 or NCV8154 families, which undergo full AEC-Q100 stress testing and include automotive-specific failure mode analysis.
NCP1546DR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
NCP1546DR2G FAQ
1.How can I place an order for NCP1546DR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1546DR2G 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 NCP1546DR2G reliable?
The price and inventory of NCP1546DR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1546DR2G is usually 5 days.
3.What payment methods are accepted for NCP1546DR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1546DR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1546DR2G?
NCP1546DR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1546DR2G 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 NCP1546DR2G?
For technical support, including NCP1546DR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1546DR2G requirements.
6.How does Aetrix verify that NCP1546DR2G is sourced from the original manufacturer or authorized distributors?
All NCP1546DR2G 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 NCP1546DR2G meets industry standards.
7.What is the process for return or replacement of NCP1546DR2G?
All NCP1546DR2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1546DR2G, 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 NCP1546DR2G part is unused and in its original packaging.
Return procedure for NCP1546DR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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