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Monolithic Power Systems Inc. NB650AGL-Z
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- Part No.:
- NB650AGL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 17-VFQFN Exposed Pad
- Datasheet:
-
NB650AGL-Z.pdf
- Description:
- IC REG BUCK ADJ 6A 17QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,340
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Product details
Overview
NB650AGL-Z from Monolithic Power Systems is a fully-integrated, synchronous step-down DC/DC converter with 6A continuous output current, 4.5V–28V input range, and dynamic 2-bit VID voltage scaling. It uses Constant-On-Time (COT) control for fast transient response in notebook I/O power and distributed systems, featuring internal 50mΩ/18mΩ MOSFETs, programmable soft-start, and comprehensive protection including OCP, SCP, OVP, UVP, and thermal shutdown.
For engineers reviewing the NB650AGL-Z datasheet, NB650AGL-Z pinout, NB650AGL-Z application, or NB650AGL-Z equivalent, key selection criteria include its QFN17 (3mm×4mm) package, 0.6V–13V adjustable output, 150kHz–1MHz frequency programming, ±20mV/μs FB slew rate during VID transitions, and latch-off OCP behavior under sustained overcurrent.
Technical Context
The NB650AGL-Z implements Constant-On-Time (COT) control with feed-forward VIN dependency to maintain stable switching frequency across input voltage variations. Its internal high-side and low-side MOSFETs (50mΩ/18mΩ) enable high-efficiency operation from 4.5V to 28V input while supporting CCM and skip-mode light-load operation.
Dynamic output voltage adjustment is achieved via two active-low VID pins controlling parallel FB-divider resistors (R2A/R2B/R2C), enabling four discrete output levels without external controller intervention. Protection logic includes cycle-by-cycle current limiting (8–10A threshold), 50μs OCP hold-off timer, 0.8V OVP and 0.4V UVP thresholds referenced to 600mV FB, and non-latching thermal shutdown at 150°C with ~25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide industrial and computing rail inputs including 5V, 12V, and 24V systems. |
| Output Current | 6A continuous - delivers full rated load without derating at TA = +25°C with proper PCB thermal layout. |
| Feedback Voltage | 600mV ±6mV - sets precise output regulation point; enables 0.6V–13V output via external resistor divider and VID scaling. |
| Switching Frequency | 150kHz to 1MHz - programmable via resistor on FREQ pin; higher frequencies allow smaller LC filter components. |
| VID Resolution | 2-bit (4 levels) - supports on-the-fly output voltage changes without reset or reconfiguration of control logic. |
| Thermal Shutdown | 150°C with ~25°C hysteresis - protects die from permanent damage; automatic soft-start resumes at ~125°C junction temperature. |
| OCP Threshold | 8A to 10A - cycle-by-cycle current limit prevents MOSFET overstress; latches off after 50μs sustained fault. |
Pinout & Package
Package: QFN17 (3mm × 4mm) with exposed thermal pad on underside - requires solder paste stencil optimization and thermal via array for θJA = 52°C/W performance on 4-layer PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | High-current path connecting internal HS/LS MOSFETs; must use wide copper traces and low-inductance layout to minimize ringing and EMI. |
| 3 BST | Bootstrap supply | Connects to SW through 0.1μF ceramic capacitor to generate floating gate drive voltage for high-side MOSFET. |
| 4 PG | Power Good open-drain | Signals valid output (FB ≥ 90% VREF) after 0.5ms delay; requires external pull-up to VCC or system rail. |
| 5 EN | Enable control | Active-high logic input; tie to VIN via 100kΩ resistor for automatic startup; 0.4V/2V logic thresholds ensure noise immunity. |
| 6,7 VID1, VID2 | VID select inputs | Active-low 2-bit interface controlling internal FB-divider resistor switching; supports four discrete output voltages without external DAC or microcontroller. |
| 8 VCC | Internal LDO output | Provides regulated bias for control circuitry; decouple with 1μF ceramic capacitor close to pin. |
| 9,10 GND | Power ground | Main return path for high-current loops; connect directly to exposed thermal pad and minimize impedance to reduce ground bounce. |
| 11 IN | Main input supply | Accepts 4.5V–28V; requires local 10μF–22μF ceramic input capacitor with low ESR to suppress high-frequency ripple. |
| 12 AGND | Analog ground | Reference for FB, SS, and internal reference; separate from power GND but tied at single point near IC for noise isolation. |
| 13 FB | Feedback input | Monitors output via resistor divider; 600mV reference enables accurate regulation; sensitive to noise-route away from SW and inductors. |
| 14,15 RFB2, RFB1 | VID switch drains | Connect to external FB divider low-side resistors (R2A/R2B/R2C); internal switches route VID-selected resistance to FB node. |
| 16 SS | Soft-start timing | Capacitor-connected node controlling ramp rate of output voltage; 10μA internal current source sets tSS = CSS × 0.6V / 10μA. |
| 17 FREQ | Frequency set | Resistor-connected pin determining ON-time and thus switching frequency; supports 150kHz–1MHz range with VIN-dependent scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary switching loss reduction | Minimizes conduction and switching losses across load range, enabling >92% peak efficiency at 12V→1.05V/6A with ceramic output caps. |
| Constant-On-Time (COT) control | Delivers <5μs load transient response with no external compensation required-ideal for CPU/GPU core and I/O rail applications. |
| Programmable soft-start time | Adjustable via external capacitor (e.g., 47nF = 28ms ramp) to prevent inrush current and ensure controlled power sequencing. |
| Integrated 50mΩ/18mΩ MOSFETs | Eliminates need for external power stages-reduces BOM count, PCB area, and layout complexity in space-constrained notebooks and STBs. |
| 2-bit VID with ±20mV/μs FB slew | Enables seamless voltage scaling between four preset rails (e.g., 1.0V/1.1V/1.2V/1.35V) during dynamic power states without interrupting operation. |
Applications
| Notebook I/O Power | Networking System Rails |
|---|---|
Use Scenario: Supplies 1.05V/6A to PCIe switch, USB controller, and SATA PHY in ultrabook platforms with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering dynamically scaled I/O voltage with VID-controlled transitions during link training and power state changes. Use Value: Eliminates need for external VID DAC and reduces solution size by 35% versus discrete controller+MOSFET designs while maintaining <10mV load regulation. | Use Scenario: Powers 3.3V/6A auxiliary rails in 1U rack-mounted Ethernet switches requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-current intermediate bus converter operating in CCM mode with robust OCP/SCP handling for PoE midspan and management subsystems. Use Value: Internal MOSFETs and thermal shutdown ensure uninterrupted operation under sustained 85°C ambient; 52°C/W θJA enables fanless design. |
| Digital Set-Top Box SoC Core | Flat-Panel Display Logic Supply |
Use Scenario: Delivers 1.2V/6A to ARM-based media processor in cable/satellite STBs with bursty video decode workloads. IC Role / Device Role / Timing Role: Fast-transient buck regulator using COT control to suppress output droop during 2A–6A load steps within 2μs. Use Value: 1% reference voltage and ±20mV/μs FB slew support sub-15mV total output deviation-meets SoC VDD tolerance specs without post-regulation LDO. | Use Scenario: Generates 5V/6A logic supply for display timing controller (TCON) and LVDS transmitter in 4K monitors. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 12V input rail with programmable soft-start to coordinate panel power-up sequence. Use Value: Programmable frequency (up to 1MHz) allows use of 1.0μH inductor and compact 1206-size capacitors-reducing board area by 40% vs. 500kHz solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4569GQB-A | 6A, 4.5V–36V input, 1.2MHz fixed frequency, no VID, integrated compensation | Lacks dynamic voltage scaling; suited for fixed-output applications where simplicity outweighs flexibility | Select when VID functionality is unnecessary and higher switching frequency improves filter size. |
| RT7297BGSP | 6A, 4.5V–32V input, 600kHz–1.2MHz programmable, no VID, external MOSFETs required | Requires external high-side/low-side MOSFETs and gate drivers-increases BOM and layout complexity | Choose only if higher thermal margin is needed via discrete FETs or if custom gate drive timing is required. |
Compared with MPQ4569GQB-A and RT7297BGSP, the NB650AGL-Z uniquely integrates 2-bit VID control and internal MOSFETs in a 3mm×4mm QFN, making it optimal for space-constrained, multi-rail systems requiring dynamic voltage scaling-where alternatives either omit VID or increase design overhead.
Availability
NB650AGL-Z is available at Aetrix Electronics and suitable for notebook I/O power, networking system rails, and digital set-top box SoC core applications requiring stable component supply and long-term production continuity.
Supply support for NB650AGL-Z 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The NB650AGL-Z belongs to MPS's NB-series high-current synchronous buck converters, designed specifically for compact, high-efficiency power delivery in portable computing and consumer electronics with dynamic voltage requirements.
FAQ
What does "NOT RECOMMENDED FOR NEW DESIGNS" mean for NB650AGL-Z?
This designation indicates MPS has superseded the NB650AGL-Z with newer-generation parts offering improved efficiency, lower quiescent current, or enhanced protection features. However, the NB650AGL-Z remains fully supported for existing designs, with guaranteed supply and full documentation through Aetrix Electronics' lifecycle management program.
Can NB650AGL-Z operate with ceramic output capacitors below 100μF?
Yes-it supports low-ESR ceramic capacitors down to 47μF when used with the external ramp compensation network (R4/C4). The device's COT architecture requires careful ramp slope design per Equation 10; insufficient ramp causes subharmonic oscillation, especially at light loads.
How is the 2-bit VID function implemented internally?
VID1 and VID2 are active-low inputs that control three internal NMOS switches connecting R2B and R2C in parallel with R2A. This creates four distinct FB-divider ratios, enabling four discrete output voltages (e.g., 0.6V, 0.9V, 1.2V, 1.5V) without changing R1 or external components.
What is the minimum recommended soft-start capacitor value?
The minimum soft-start capacitor is 4.7nF when output capacitance exceeds 330μF. Smaller values risk excessive inrush current and overshoot; larger values extend startup time linearly (tSS ≈ CSS × 60ms/nF). For 12V→1.05V/6A designs, 22nF provides ~1.3s ramp with <1% overshoot.
Does NB650AGL-Z support forced PWM mode?
No-it automatically transitions between CCM and skip mode based on load current. There is no pin or register to force continuous switching; light-load efficiency is prioritized via valley-switching and tri-state LS-FET driver, reducing quiescent current to 400μA.
What is the maximum allowable input voltage for reliable operation?
The absolute maximum VIN is 28V, but the recommended operating maximum is 22.5V per datasheet Section 3. Exceeding 22.5V risks accelerated degradation of internal MOSFET oxide layers and reduced long-term reliability-even if thermal limits are not breached.
How does the power-good (PG) signal behave during thermal shutdown?
During thermal shutdown, PG remains asserted (high) until FB drops below 90% of 600mV (i.e., 540mV). Once shutdown occurs and output collapses, PG deasserts after the standard 0.5ms delay. PG does not indicate thermal status-it only reflects regulated output voltage presence.
NB650AGL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 17-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 22.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 6A
- Frequency - Switching:
- 150kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 17-QFN (3x4)
NB650AGL-Z FAQ
1.How can I place an order for NB650AGL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for NB650AGL-Z 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 NB650AGL-Z reliable?
The price and inventory of NB650AGL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NB650AGL-Z is usually 5 days.
3.What payment methods are accepted for NB650AGL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NB650AGL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NB650AGL-Z?
NB650AGL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NB650AGL-Z 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 NB650AGL-Z?
For technical support, including NB650AGL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NB650AGL-Z requirements.
6.How does Aetrix verify that NB650AGL-Z is sourced from the original manufacturer or authorized distributors?
All NB650AGL-Z 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 NB650AGL-Z meets industry standards.
7.What is the process for return or replacement of NB650AGL-Z?
All NB650AGL-Z units undergo pre-shipment inspection (PSI). If there is an issue with NB650AGL-Z, 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 NB650AGL-Z part is unused and in its original packaging.
Return procedure for NB650AGL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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