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onsemi NCP691MN50T2G
- Part No.:
- NCP691MN50T2G
- Manufacturer:
- onsemi
- Package:
- 6-VDFN Exposed Pad
- Datasheet:
-
NCP691MN50T2G.pdf
- Description:
- IC REG LINEAR 5V 1A 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
NCP691MN50T2G from onsemi is a fixed-output 5.0 V, 1 A CMOS low-dropout (LDO) voltage regulator in a DFN6 3×3 mm package. It features ±2% output voltage tolerance over −40°C to +125°C, 190 mV dropout at 1 A (VOUT = 2.5 V), active low enable pin, and integrated thermal/short-circuit protection - designed for space-constrained portable battery-powered systems requiring stable, low-noise power.
For engineers reviewing the NCP691MN50T2G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1 A output current with low ground current (145 µA at 1 A load), high PSRR (62 dB @ 120 Hz), 50 µVrms output noise, and compatibility with low-ESR ceramic capacitors without minimum ESR requirements.
Technical Context
The NCP691MN50T2G implements a PMOS pass transistor architecture with bandgap reference, active discharge, and internal current limiting. Its EN pin is active-low, enabling direct control by microcontroller GPIOs without level-shifting. The device operates across 1.5 V to 6.0 V input range and maintains regulation down to 1.5 V minimum input when delivering 5.0 V output.
Thermal shutdown activates at 175°C with 10°C hysteresis, and the DFN6 package provides 70°C/W junction-to-ambient thermal resistance on 64 mm² copper. Output sensing via SNS pin enables remote feedback for improved load regulation accuracy, while the adjustable version uses ADJ pin - not applicable to this fixed 5.0 V variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over −40°C to +125°C - ensures stable core logic supply for FPGA, DSP, and microprocessor I/O rails. |
| Max Output Current | 1 A continuous - supports single-rail powering of medium-power digital subsystems without external current boosting. |
| Dropout Voltage | 120 mV typical at 1 A (VOUT = 5.0 V) - enables operation from Li-ion (3.0–4.2 V) or dual-cell alkaline inputs with minimal headroom loss. |
| Ground Current | 145 µA at 1 A load - minimizes quiescent power draw critical for battery life in always-on portable applications. |
| PSRR | 62 dB @ 120 Hz - suppresses ripple from switching DC-DC pre-regulators feeding the LDO input. |
| Noise Voltage | 50 µVrms (200 Hz–100 kHz) - eliminates need for external bypass capacitor, simplifying layout and reducing BOM count. |
| Enable Logic | Active-low EN pin - allows direct interfacing with 3.3 V or 5 V microcontroller outputs for precise power sequencing control. |
Pinout & Package
Package: DFN6 3×3 mm, 0.95 mm pitch, exposed thermal pad (Case 506AH, MN suffix). Pin 1 marked by dot; pins 1 and 6 are parallel IN inputs for full current capability; pin 2 is GND with thermal pad connection; pin 3 is active-low EN; pin 4 is regulated OUT; pin 5 is SNS (sense) tied directly to OUT for precision regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 (IN) | Input voltage supply | Parallel input terminals - must be shorted externally to deliver full 1 A output current and minimize trace impedance. |
| 2 (GND) | Power ground | Die ground reference and primary thermal path - requires soldering exposed pad to ≥64 mm² copper for 70°C/W RJA. |
| 3 (EN) | Enable control | Active-low logic input - drives regulator ON when pulled ≤0.4 V; pulls high to VIN for default-enable operation. |
| 4 (OUT) | Regulated output | 5.0 V regulated rail - connects to load and SNS pin; requires ≥1 µF ceramic capacitor for stability. |
| 5 (SNS) | Voltage sense feedback | Remote sensing node - must be connected directly to OUT pin to compensate for PCB trace IR drop. |
Key Features
| Feature | Design Value |
|---|---|
| Active output discharge | Discharges OUT pin rapidly after disable - prevents floating voltage during power-down sequencing in multi-rail systems. |
| Enhanced ESD protection | 4 kV HBM / 200 V MM - improves robustness against handling and board-level ESD events without external TVS diodes. |
| Low-noise operation | 50 µVrms noise without bypass cap - eliminates noise-reduction capacitor and associated startup delay, enabling fast system wake-up. |
| Thermal shutdown with hysteresis | 175°C trip / 165°C recovery - protects against sustained overload or poor heatsinking while preventing thermal oscillation. |
| Ceramic capacitor compatible | Stable with ≥1 µF ceramic COUT - avoids costly tantalum or polymer capacitors and reduces footprint in space-limited designs. |
Applications
| Laptops and PCI Cards | Modem Banks and Telecom Boards |
|---|---|
Use Scenario: Powering USB controller, PCIe endpoint logic, and BIOS flash memory on compact laptop daughterboards. IC Role / Device Role / Timing Role: Primary 5.0 V LDO supplying I/O rails for high-speed serial interfaces with tight voltage tolerance. Use Value: ±2% output accuracy and 62 dB PSRR ensure signal integrity on USB 2.0/3.0 data lines under noisy DC-DC pre-regulator conditions. | Use Scenario: Providing clean 5.0 V bias to analog front-end (AFE) circuitry and line-driver ICs in DSL/Cable modem baseboards. IC Role / Device Role / Timing Role: Low-noise post-regulator for sensitive analog signal chains requiring minimal power-supply-induced jitter. Use Value: 50 µVrms noise floor prevents SNR degradation in 12-bit ADCs and DACs used in voice/data conversion stages. |
| DSP, FPGA, Microprocessor Boards | Hard Disk Drives |
Use Scenario: Delivering 5.0 V to FPGA configuration I/O banks and JTAG debug interfaces in embedded vision processing modules. IC Role / Device Role / Timing Role: Sequenced power rail enabled via microcontroller GPIO to coordinate FPGA configuration timing. Use Value: Active-low EN pin enables precise power-up/down coordination with FPGA DONE and INIT_B signals without additional logic. | Use Scenario: Supplying 5.0 V to HDD servo motor drivers and read-channel ASICs in 2.5-inch SATA drives. IC Role / Device Role / Timing Role: High-current LDO supporting transient motor startup currents up to 1 A with fast load-step response. Use Value: 190 mV dropout at 1 A allows operation from 5.5 V nominal supply even under brownout, maintaining spindle motor control during voltage dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-5002E/MB | 5.0 V fixed, 250 mA max output, 600 mV dropout at 250 mA - lower current rating and higher dropout than NCP691MN50T2G. | Suitable only for low-power peripherals (e.g., sensors, EEPROMs); insufficient for 1 A loads like FPGA I/O or HDD motors. | Select when board space is extremely constrained and load current remains ≤250 mA - not a functional replacement for 1 A use cases. |
| TPS7A2050PDBVR | 5.0 V fixed, 300 mA max, 175 mV dropout at 300 mA, 3.5 µVrms noise - ultra-low noise but ⅓ the current capacity of NCP691MN50T2G. | Targeted at RF/analog signal chains (e.g., PLLs, ADCs); lacks thermal/current robustness for digital load transients. | Choose for noise-sensitive analog rails where current demand is <300 mA; avoid for digital subsystems requiring 1 A burst capability. |
Compared with MCP1703T-5002E/MB and TPS7A2050PDBVR, the NCP691MN50T2G uniquely delivers 1 A output with 120–190 mV dropout and 50 µVrms noise in a thermally optimized DFN6 package - making it the only viable option among the three for portable systems needing both high current and low noise in a single LDO.
Availability
NCP691MN50T2G is available at Aetrix Electronics and suitable for laptops, telecom boards, and hard disk drive designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for NCP691MN50T2G 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP691MN50T2G belongs to onsemi's NCP69x CMOS LDO family, engineered for portable battery-powered applications demanding high PSRR, low quiescent current, and ceramic-capacitor compatibility in ultra-compact packages.
FAQ
What is the maximum input voltage rating for the NCP691MN50T2G?
The NCP691MN50T2G has an absolute maximum input voltage of 6.5 V. Its recommended operating input range is 1.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage per Absolute Maximum Ratings (Table 3), and operation below 1.5 V may fail to maintain regulation due to dropout constraints - especially critical when delivering 5.0 V output.
Does the NCP691MN50T2G require an external bypass capacitor for noise reduction?
No, the NCP691MN50T2G does not require an external bypass capacitor. Its 50 µVrms output noise (200 Hz–100 kHz) is achieved internally, eliminating the need for a noise-reduction capacitor. This simplifies layout, reduces component count, and enables fast 50 µs turn-on time - unlike traditional low-noise LDOs that rely on external caps and suffer slower startup.
How is the enable pin configured on the NCP691MN50T2G?
The NCP691MN50T2G features an active-low enable pin (EN). The regulator turns ON when EN is pulled ≤0.4 V and OFF when EN is ≥0.9 V. To enable the device by default, connect EN directly to VIN. For microcontroller control, drive EN with a 3.3 V or 5 V GPIO - no level-shifter needed due to its wide input voltage tolerance (−0.3 V to 6.5 V).
What thermal performance can be expected from the NCP691MN50T2G in a standard PCB layout?
With a 64 mm² copper area on FR4, the NCP691MN50T2G achieves 70°C/W junction-to-ambient thermal resistance (RJA). At 1 A load with 5.0 V output and 5.5 V input, power dissipation is ~500 mW - resulting in ~35°C junction rise above ambient. Full derating occurs above 125°C junction temperature, enforced by internal thermal shutdown at 175°C.
Can the NCP691MN50T2G be used with ceramic output capacitors smaller than 10 µF?
Yes, the NCP691MN50T2G is stable with as little as 1 µF ceramic output capacitance, per Applications Information. While 10 µF is recommended for optimal load transient response and noise rejection, the minimum 1 µF requirement reduces BOM cost and board area - particularly valuable in ultra-thin portable devices where capacitor height and footprint are constrained.
NCP691MN50T2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.21V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- 240 µA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (3x3)
NCP691MN50T2G FAQ
1.How can I place an order for NCP691MN50T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP691MN50T2G 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 NCP691MN50T2G reliable?
The price and inventory of NCP691MN50T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP691MN50T2G is usually 5 days.
3.What payment methods are accepted for NCP691MN50T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP691MN50T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP691MN50T2G?
NCP691MN50T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP691MN50T2G 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 NCP691MN50T2G?
For technical support, including NCP691MN50T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP691MN50T2G requirements.
6.How does Aetrix verify that NCP691MN50T2G is sourced from the original manufacturer or authorized distributors?
All NCP691MN50T2G 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 NCP691MN50T2G meets industry standards.
7.What is the process for return or replacement of NCP691MN50T2G?
All NCP691MN50T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP691MN50T2G, 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 NCP691MN50T2G part is unused and in its original packaging.
Return procedure for NCP691MN50T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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