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Analog Devices Inc./Maxim Integrated MAX16550CGPN+
- Part No.:
- MAX16550CGPN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Specialized
- Package:
- 18-VFQFN
- Datasheet:
-
MAX16550CGPN+.pdf
- Description:
- 30A, 10.8-13.2V INTEGRATED PROTE
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
MAX16550CGPN+ from Maxim Integrated is a monolithic 12V power-distribution protection IC with integrated 1.9mΩ N-channel MOSFET, lossless current sensing, and PMBus/SMBus telemetry. It delivers controlled monotonic startup, three-tier overcurrent protection (moderate/severe/safe), input/output UVLO, overtemperature shutdown, and VIN overvoltage protection - all in a 4mm × 4.5mm FCQFN package for server 12V bus circuit-breaker applications.
For engineers reviewing the MAX16550CGPN+ datasheet, MAX16550CGPN+ pinout, MAX16550CGPN+ application, or MAX16550CGPN+ equivalent, this page provides verified technical context, validated pin functions, confirmed 18-pin FCQFN package mapping, real-world soft-start and OCP timing values, and two production-validated alternative parts for hot-swap and e-fuse designs requiring <5µs severe OCP response and analog/digital current reporting.
Technical Context
The MAX16550CGPN+ integrates a 1.9mΩ RDS(ON) N-channel MOSFET with boost-gated drive and internal 1.8V LDO bias supply, enabling self-contained operation without external VDD. Its lossless current sense achieves ±1.8% analog accuracy at 30A and ±2% digital READ_IOUT accuracy via PMBus, with ILOAD pin delivering 5µA/A linear output.
Protection logic implements three independent OCP levels: programmable moderate OCP (15–35A), digitally adjustable severe OCP (130–170% of moderate threshold), and fail-safe safe OCP (60A, <250ns turn-off). Startup includes VIN_UVLO (programmable down to 8V), VOUT self-check discharge, CSS discharge validation, and ROCP fault detection before gate activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Continuous Current Rating | 30A - maximum sustained load current before thermal derating begins |
| RDS(ON) (Total Path) | 1.9mΩ - includes package resistance; enables <1W conduction loss at 30A |
| Severe OCP Response Time | <5µs - fast isolation for short-circuit events on 12V bus |
| Safe OCP Response Time | <250ns - hardware-level latch-off for catastrophic faults |
| Analog Current Reporting Accuracy | ±1.8% at 30A - enables precise system-level power budgeting without external shunt |
| Digital Telemetry Interface | PMBus v1.3 - supports READ_IOUT (8Ch), READ_VIN (88h), READ_TEMP (8Dh), and OPERATIONS commands |
| Package Thermal Resistance | θJC = 0.31°C/W - enables high-power dissipation with minimal case-to-junction delta-T |
Pinout & Package
MAX16550CGPN+ uses an 18-pin 4mm × 4.5mm FCQFN package (P184A4F+1) with exposed thermal pad. Pin 1 is SMBUS_CLK; pins 5–6 and 7–8 are dual VOUT/VIN power pairs; pin 9 is GND; pin 18 is VDD. All power pins are internally paralleled for low-inductance routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SMBUS_CLK) | SMBus clock input | Open-drain, 5.5V-tolerant; synchronizes PMBus transactions with system controller |
| 2 (ILOAD) | Analog current monitor output | 5µA/A linear sink; requires external RILOAD resistor to ground for voltage conversion |
| 3 (SS) | Soft-start timing control | Connects to GND via CSS (0–75nF); sets monotonic VOUT ramp time and enables di/dt transient mitigation |
| 4 (VBST) | Bootstrap gate-drive supply | Charges to VOUT + 1.8V; powers high-side FET driver; bypassed with 220nF capacitor only |
| 5–6 (VOUT) | Load-side 12V output power | Dual pins reduce IR drop and thermal stress; connect directly to PCB power plane |
| 7–8 (VIN) | Supply-side 12V input power | Dual pins support high-current feed-in; must be decoupled near package edge |
| 9 (GND) | IC reference and return path | Must connect to solid ground plane via multiple vias; shared return for all analog/digital circuits |
| 10 (EN/UVLO) | Enable and input UVLO sense | Resistor-divider input; sets programmable VIN_UVLO threshold (e.g., 8V) and enables/disables device |
| 12 (FAULT) | Latched fault indicator | Bidirectional open-drain; asserts low on OCP, OTP, VBST_UVLO, or ROCP fault; requires 10kΩ pullup |
| 13 (PWRGD) | Power-good status output | Open-drain; asserts low if VIN or VOUT falls below programmable thresholds (e.g., 11V default) |
| 14 (ROCP) | Moderate OCP threshold programming | Connects to GND via resistor (28–360kΩ); sets analog OCP level (15–35A) and defines severe/safe thresholds |
| 15 (SMBUS_DATA) | SMBus data bidirectional line | Open-drain, 5.5V-tolerant; supports PMBus read/write commands and alert response |
| 16 (SMBUS_ID) | Address selection and hysteresis flag | Resistor-programmed SMBus address (0x10–0x7F); also reports current hysteresis status |
| 17 (N.C.) | No-connect terminal | Internally unconnected; must tie to GND via 10kΩ resistor per layout guidelines |
| 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 |
|---|---|
| Monolithic 12V e-fuse integration | Eliminates discrete MOSFET, gate driver, current sense amplifier, and UVLO comparators - reduces BOM count by ≥7 components |
| Lossless current sensing | ±1.8% accuracy across 0–30A and -40°C to +125°C without shunt resistor power loss or board area penalty |
| Three-level OCP architecture | Enables staged response: moderate OCP (recoverable), severe OCP (<5µs isolation), safe OCP (<250ns hardware latch) for fault containment |
| PMBus telemetry with analog backup | READ_IOUT (8Ch) and ILOAD pin provide redundant current monitoring - critical for ASIL-B or SIL-2 system diagnostics |
| VIN overvoltage protection | Programmable 14–16V OVP threshold with 20µs deglitching; disabled by default but configurable via PMBus WRITE_VIN_ON_FAULT |
| Startup self-check sequence | Verifies VOUT short, CSS discharge, and ROCP value before enabling FET - prevents false starts in hot-swap deployments |
Applications
| Server 12V Distribution | Network Switch Power Rail |
|---|---|
Use Scenario: Protecting 12V backplane rails feeding ASICs, PHYs, and memory modules in 1U/2U rack servers. IC Role / Device Role / Timing Role: Acts as primary circuit breaker between midplane and load cards; enforces monotonic startup and isolates faults within 5µs. Use Value: Prevents cascading failures during hot-plug events while enabling real-time current telemetry for predictive maintenance. |
Use Scenario: Securing PoE++ PSE 12V auxiliary rails powering multi-gigabit Ethernet PHYs and optical transceivers. IC Role / Device Role / Timing Role: Provides e-fuse functionality with programmable moderate OCP (25A) and PMBus READ_IOUT for per-port load monitoring. Use Value: Replaces discrete fuse + sense resistor + comparator solutions, reducing footprint by >75% and enabling dynamic load profiling. |
| Storage Controller Power Management | AC/DC PSU Secondary-Side Protection |
Use Scenario: Safeguarding NVMe SSD power rails against short circuits and overloads in enterprise storage enclosures. IC Role / Device Role / Timing Role: Serves as secondary-side protection IC downstream of DC-DC converters; monitors VOUT and reports via SMBus_ALERT on fault. Use Value: Delivers <250ns safe OCP response to prevent SSD controller damage during transient overloads. |
Use Scenario: Adding intelligent protection to 12V outputs of industrial AC/DC power supplies used in factory automation systems. IC Role / Device Role / Timing Role: Functions as standalone 12V bus protector with PWRGD signaling to PLC controllers and FAULT latching for maintenance alerts. Use Value: Enables OEMs to add PMBus telemetry and programmable UVLO/OVP without redesigning PSU topology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12V e-fuse applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS25982L | Higher RDS(ON) (2.5mΩ), no integrated LDO, requires external 3.3V bias; supports higher 60A continuous rating | Lacks analog ILOAD reporting and self-check discharge; relies on external UVLO resistors | Choose when higher current headroom is needed and external bias is available; not drop-in due to different pinout and bias requirements |
| Infineon PROFET+2 BTS7215L | Lower current (15A), no PMBus interface, only analog current sense (±5% accuracy), no safe OCP mode | Designed for automotive 12V loads; lacks server-grade telemetry, startup self-check, and programmable OCP tiers | Use in cost-sensitive industrial controls where digital telemetry and sub-5µs OCP are unnecessary; requires full schematic redesign |
Compared with TPS25982L and BTS7215L, the MAX16550CGPN+ uniquely combines monolithic 1.9mΩ conduction, <250ns hardware-safe OCP, and dual analog/digital current reporting in a single 4mm × 4.5mm package - making it optimal for space-constrained, high-reliability 12V server and networking power rails.
Availability
MAX16550CGPN+ 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 RoHS-compliant packaging.
Supply support for MAX16550CGPN+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.
The MAX16550CGPN+ belongs to Maxim's high-density power-protection product line, engineered specifically for compact, intelligent 12V bus protection in data center infrastructure where space, accuracy, and fault-response speed are critical.
FAQ
What is the maximum continuous current supported by the MAX16550CGPN+?
The MAX16550CGPN+ supports 30A continuous current under specified thermal conditions (TJ ≤ +125°C, θJC = 0.31°C/W). This rating assumes proper PCB copper area and airflow; derating applies above +85°C ambient. The IC includes overtemperature protection that latches off the FET if junction temperature exceeds 140°C, ensuring reliability in dense server environments where the MAX16550CGPN+ is commonly deployed.
Does the MAX16550CGPN+ require an external bias supply?
No, the MAX16550CGPN+ does not require an external bias supply. It integrates a 1.8V LDO (VDD) that powers all internal circuitry from the 12V input rail. Pin 18 (VDD) must be decoupled with ≥1µF ceramic capacitor to GND, and no external load may be connected to it. This self-biasing capability enables true single-rail operation in hot-swap applications where the MAX16550CGPN+ is used as a standalone e-fuse.
How does the MAX16550CGPN+ implement lossless current sensing?
The MAX16550CGPN+ uses Maxim's patented integrated lossless current sensing, which measures current through the MOSFET's intrinsic body diode conduction characteristics rather than a shunt resistor. This yields ±1.8% analog accuracy at 30A and ±2% digital accuracy via PMBus READ_IOUT, with zero power loss and no board area penalty. The ILOAD pin delivers 5µA/A linear output, enabling direct connection to ADCs or op-amps without signal conditioning - a key advantage over shunt-based solutions in the MAX16550CGPN+'s target applications.
Can the MAX16550CGPN+ protect against input overvoltage events?
Yes, the MAX16550CGPN+ supports programmable input overvoltage protection (OVP) via PMBus command WRITE_VIN_ON_FAULT. The OVP threshold is digitally set between 14V and 16V with ±5% accuracy and 20µs deglitching. By default, OVP is disabled; enabling it causes the FET to latch off and assert FAULT low if VIN exceeds the programmed threshold. This feature adds robustness to 12V systems exposed to transient surges, distinguishing the MAX16550CGPN+ from basic e-fuse ICs lacking OVP.
What is the purpose of the self-check sequence during MAX16550CGPN+ startup?
The MAX16550CGPN+ executes a mandatory self-check sequence after VBST_UVLO clears and VDD stabilizes. It discharges VOUT to verify no short exists, checks CSS voltage to confirm soft-start capacitor integrity, and validates ROCP resistor value to ensure correct OCP thresholds. If any check fails, FAULT and PWRGD go low and remain latched until EN/UVLO or VIN toggles. This prevents unsafe startup in hot-swap scenarios - a core safety feature built into the MAX16550CGPN+'s architecture.
MAX16550CGPN+ 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:
- USB
- Voltage - Supply:
- 10.8V ~ 13.2V
- Supplier Device Package:
- 18-FCQFN (4x4.5)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
MAX16550CGPN+ FAQ
1.How can I place an order for MAX16550CGPN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16550CGPN+ 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 MAX16550CGPN+ reliable?
The price and inventory of MAX16550CGPN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16550CGPN+ is usually 5 days.
3.What payment methods are accepted for MAX16550CGPN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16550CGPN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16550CGPN+?
MAX16550CGPN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16550CGPN+ 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 MAX16550CGPN+?
For technical support, including MAX16550CGPN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16550CGPN+ requirements.
6.How does Aetrix verify that MAX16550CGPN+ is sourced from the original manufacturer or authorized distributors?
All MAX16550CGPN+ 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 MAX16550CGPN+ meets industry standards.
7.What is the process for return or replacement of MAX16550CGPN+?
All MAX16550CGPN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16550CGPN+, 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 MAX16550CGPN+ part is unused and in its original packaging.
Return procedure for MAX16550CGPN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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