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Analog Devices Inc./Maxim Integrated MAX16550BGPN+
- Part No.:
- MAX16550BGPN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 18-VFQFN
- Datasheet:
-
MAX16550BGPN+.pdf
- Description:
- IC PROTECTION 12V BUS PMBUS
- Quantity:
- Payment:
- Shipping:
Inventory:236
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Product details
Overview
MAX16550BGPN+ from Analog Devices is a monolithic 12V power-distribution protection IC integrating a 1.9mΩ N-channel MOSFET, lossless current sensing, SMBus/PMBus telemetry, and programmable three-level overcurrent protection (startup OCP = 16A, moderate OCP = 15–35A, severe OCP < 5µs isolation). It delivers controlled monotonic startup, input/output UVLO monitoring, and real-time analog/digital current reporting for server and networking 12V bus applications.
For engineers reviewing the MAX16550BGPN+ datasheet, MAX16550BGPN+ pinout, MAX16550BGPN+ application, or MAX16550BGPN+ equivalent, this page provides verified technical context, validated pin functions, confirmed 18-pin FCQFN package mapping, exact soft-start timing (1–75nF CSS), and two production-validated alternative parts with documented functional trade-offs.
Technical Context
The MAX16550BGPN+ implements a source-follower pass-FET architecture with integrated charge-pump gate drive (VBST) and internal 1.8V LDO (VDD) for self-biasing. Its lossless current sense achieves ±1.8% accuracy at 30A across temperature using analog ILOAD output (5µA/A gain) and digital READ_IOUT (±2% at 30A).
Protection logic includes three independent OCP tiers: programmable moderate OCP (15–35A, 12.5µs–250ms timeout), digitally scalable severe OCP (< 5µs turn-off), and fail-safe safe OCP (< 250ns isolation). UVLO thresholds are resistor-programmable on EN/UVLO (8V default) and SMBus-configurable for PWRGD (11V default) and VBST (0.8–1.6V above VOUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Continuous Current | 30A - Sustained load current capability without thermal shutdown under 200LFM airflow at +70°C ambient. |
| RDS(ON) | 1.9mΩ - Total on-resistance including package, limiting conduction loss to ≤1.7W at 30A. |
| Startup OCP Threshold | 16A - Fixed current limit during soft-start to prevent inrush damage; specific to MAX16550B variant. |
| ILOAD Reporting Accuracy | ±1.8% at 30A - Analog current-sense error bound enabling precise system-level power budgeting. |
| PMBus Telemetry Resolution | READ_IOUT (0.125A LSB) - Digital current reporting granularity supporting closed-loop power management. |
| Package Thermal Resistance | θJC = 0.31°C/W - Enables direct heatsink mounting for high-power derating in dense server PCB layouts. |
| Soft-Start Capacitor Range | 0–75nF - External CSS value sets monotonic ramp time (1ms minimum) and controls peak di/dt during startup. |
Pinout & Package
MAX16550BGPN+ uses an 18-pin 4mm × 4.5mm FCQFN package (P184A4F+1) with exposed thermal pad. Pin 1 is top-left corner (SMBUS_CLK), pins 5–6 and 7–8 are dual-source VOUT/VIN power pads, and pin 9 is GND ground plane connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SMBUS_CLK) | SMBus clock input | Drives synchronous communication with host controller; supports up to 400kHz operation. |
| 2 (ILOAD) | Analog current monitor output | Provides 5µA/A proportional current signal; requires external 8.64kΩ resistor to ground for 1.35V full-scale voltage. |
| 3 (SS) | Soft-start timing control | Charged by 20–39µA internal current source; capacitor value directly sets ramp duration and inrush control. |
| 4 (VBST) | Gate-boost supply | Charges to 1.8V above VOUT via internal charge pump; powers FET gate driver for low RDS(ON). |
| 5–6 (VOUT) | 12V output power path | Dual 1.2mm × 2.5mm copper pads carrying load current to downstream circuitry; low-inductance layout critical. |
| 7–8 (VIN) | 12V input power path | Dual 1.2mm × 2.5mm copper pads accepting upstream 12V supply; designed for minimal voltage drop. |
| 9 (GND) | IC reference ground | Must connect to PCB ground plane via ≥4 thermal vias to maintain thermal performance and noise immunity. |
| 10 (EN/UVLO) | Enable & input UVLO sense | Resistor-divider node setting 8V VIN_UVLO threshold; also serves as hardware enable/disable control. |
| 11 (SMBUS_ALERT) | Open-drain fault alert | Asserts low on any latched fault (OCP, OTP, UVLO); requires external pullup to system bias rail. |
| 12 (FAULT) | Bidirectional fault interface | Active-low open-drain pin used for both fault reporting and external latch-reset signaling. |
| 13 (PWRGD) | Power-good status indicator | Asserts low if VOUT < 11V or VIN < 8V; 5V-tolerant output with 3.2µs propagation delay. |
| 14 (ROCP) | Moderate OCP threshold set | Connects to GND via 28–360kΩ resistor to program 15–35A trip point; no other components allowed. |
| 15 (SMBUS_DATA) | SMBus data bidirectional | Open-drain I/O supporting PMBus commands (READ_IOUT, READ_VIN, OPERATIONS) and telemetry. |
| 16 (SMBUS_ID) | Address programming & hysteresis flag | Resistor-to-GND selects SMBus address; later repurposed as current-hysteresis status indicator. |
| 17 (N.C.) | No-connect terminal | Internally unconnected; must tie to GND via 10kΩ resistor per datasheet layout guidance. |
| 18 (VDD) | Internal 1.8V LDO output | Supplies all internal circuitry; requires ≥1µF ceramic capacitor to GND; no external loading permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.9mΩ MOSFET | Eliminates discrete FET + driver + sense resistor, reducing board area by >75% vs. conventional solutions. |
| Lossless current sensing | Enables ±1.8% analog current reporting at 30A without shunt resistor losses or thermal drift errors. |
| Three-tier OCP architecture | Allows simultaneous fast fault isolation (<250ns), moderate overload tolerance (100µs), and startup inrush limiting (16A). |
| PMBus/SMBus telemetry | Supports real-time READ_IOUT, READ_VIN, READ_PIN, and READ_TEMPERATURE_1 for system health monitoring. |
| Programmable soft-start | Configurable 0–75nF CSS capacitor enables precise inrush control and eliminates need for external timers. |
| VIN-to-VOUT short detection | Self-check procedure verifies pass-FET integrity before startup, preventing catastrophic failure during hot-swap events. |
Applications
| Server 12V Distribution | Network Switch Power Rail |
|---|---|
Use Scenario: Protecting 12V backplane distribution in dual-socket Xeon servers with multiple VRMs and PCIe slots. IC Role / Device Role / Timing Role: Acts as primary eFuse and telemetry hub between midplane and load VRMs; monitors total rail current and reports via PMBus to BMC. Use Value: Enables dynamic power capping and predictive failure analysis using ±1.8% current accuracy and 100kHz analog bandwidth. | Use Scenario: Securing 12V power delivery to ASICs and PHYs in 10G/25G Ethernet switches with hot-swap capability. IC Role / Device Role / Timing Role: Functions as hot-swap controller and fault isolator; initiates monotonic startup while detecting VIN-to-VOUT shorts within 2.2s. Use Value: Guarantees <250ns safe-OCP response to catastrophic faults, preventing board-level damage during field maintenance. |
| Storage Controller Power Management | AC/DC PSU Secondary-Side Monitoring |
Use Scenario: Managing 12V power to NVMe SSD controllers and DRAM buffers in enterprise storage enclosures. IC Role / Device Role / Timing Role: Serves as intelligent power switch with programmable UVLO (8V) and PWRGD (11V) thresholds aligned to storage subsystem brownout requirements. Use Value: Provides analog ILOAD output for real-time thermal throttling decisions and digital energy reporting (READ_EIN) for power usage accounting. | Use Scenario: Monitoring and protecting the 12V output stage of modular AC/DC power supplies used in telecom rectifiers. IC Role / Device Role / Timing Role: Integrates as secondary-side protector with lossless current sensing, replacing shunt-based solutions to improve efficiency. Use Value: Reduces conduction losses by eliminating 2mΩ shunt resistor, improving overall PSU efficiency by 0.3% at 30A full load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12V eFuse and power-monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16550AGPN+ | Lower startup OCP (8A vs. 16A); identical RDS(ON), package, and PMBus feature set. | Better suited for systems with lower inrush loads (e.g., fan-only modules) where 16A startup headroom is unnecessary. | Select MAX16550AGPN+ when startup current demands are ≤8A and cost optimization is prioritized over higher inrush margin. |
| TPS25982LVR | 40V max VIN, 3.5mΩ RDS(ON), no integrated LDO or analog ILOAD; uses I2C (not PMBus) with fewer telemetry registers. | Targeted at industrial 24V systems requiring wider input range but lacking server-grade telemetry and lossless sensing. | Choose TPS25982LVR for non-PMBus designs needing higher VIN tolerance and simpler I2C integration, accepting reduced current accuracy and no analog output. |
Compared with MAX16550AGPN+, the MAX16550BGPN+ offers double the startup OCP headroom for high-capacitance loads, while versus TPS25982LVR it delivers superior 12V-specific accuracy, integrated biasing, and richer telemetry-critical for datacenter power management compliance.
Availability
MAX16550BGPN+ is available at Aetrix Electronics and suitable for server motherboard design, network switch power distribution, and enterprise storage controller applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX16550BGPN+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The MAX16550B belongs to Analog Devices' Power Protection IC product line, engineered specifically for high-density, telemetry-enabled 12V bus protection in cloud infrastructure and networking equipment.
FAQ
What is the maximum continuous current rating for the MAX16550BGPN+?
The MAX16550BGPN+ supports 30A continuous current under specified thermal conditions (200LFM airflow, +70°C ambient). This rating is enabled by its 1.9mΩ RDS(ON) and 0.31°C/W junction-to-case thermal resistance. Derating is required above +70°C ambient or with reduced airflow; full 30A operation is validated per Analog Devices' thermal evaluation data (Figure 21, datasheet p.12).
How does the MAX16550BGPN+ implement lossless current sensing?
The MAX16550BGPN+ uses Analog Devices' proprietary integrated current-sense technique that measures MOSFET channel voltage drop without external shunts. It delivers ±1.8% accuracy at 30A via analog ILOAD output (5µA/A gain) and ±2% digital READ_IOUT reporting. This eliminates shunt resistor power loss and thermal drift, directly improving system efficiency and measurement stability.
Can the MAX16550BGPN+ be used in hot-swap applications?
Yes, the MAX16550BGPN+ is explicitly designed for hot-swap use. Its integrated 1.8V LDO (VDD) enables self-biasing without external supplies, and features like VIN-to-VOUT short detection, programmable soft-start (CSS), and <250ns safe-OCP response ensure robust insertion into live 12V backplanes. The datasheet includes dedicated hot-swap startup waveforms (Figures 13, 14) confirming reliable operation.
What is the function of the ROCP pin on the MAX16550BGPN+?
The ROCP pin on the MAX16550BGPN+ sets the moderate overcurrent protection threshold by connecting to GND through a resistor (28–360kΩ). This configures the trip point from 15A to 35A with ±12% accuracy. The pin has no other function-no capacitors or additional components are permitted, as stated in the Pin Description (p.14) and Electrical Characteristics (p.4) of the datasheet.
Does the MAX16550BGPN+ support both SMBus and PMBus protocols?
Yes, the MAX16550BGPN+ fully supports both SMBus 3.0 and PMBus 1.3 protocols via its SMBUS_CLK and SMBUS_DATA pins. It implements mandatory PMBus commands (READ_IOUT, READ_VIN, READ_VOUT, OPERATIONS) and optional ones (STORE_DEFAULT_ALL, RESTORE_DEFAULT_ALL), enabling full digital configuration, telemetry, and fault logging in compliant systems.
MAX16550BGPN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 18-VFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Communications Controller
- Interface:
- SMBus
- Voltage - Supply:
- 10.8V ~ 13.2V
- Supplier Device Package:
- 18-FCQFN (4x4.5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX16550BGPN+ FAQ
1.How can I place an order for MAX16550BGPN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16550BGPN+ 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 MAX16550BGPN+ reliable?
The price and inventory of MAX16550BGPN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16550BGPN+ is usually 5 days.
3.What payment methods are accepted for MAX16550BGPN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16550BGPN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16550BGPN+?
MAX16550BGPN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16550BGPN+ 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 MAX16550BGPN+?
For technical support, including MAX16550BGPN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16550BGPN+ requirements.
6.How does Aetrix verify that MAX16550BGPN+ is sourced from the original manufacturer or authorized distributors?
All MAX16550BGPN+ 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 MAX16550BGPN+ meets industry standards.
7.What is the process for return or replacement of MAX16550BGPN+?
All MAX16550BGPN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16550BGPN+, 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 MAX16550BGPN+ part is unused and in its original packaging.
Return procedure for MAX16550BGPN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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