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Analog Devices Inc./Maxim Integrated MAX8536EUA+
- Part No.:
- MAX8536EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8536EUA+.pdf
- Description:
- IC OR CTRLR N+1 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
MAX8536EUA+ from Maxim Integrated is a 3.3V/5V ORing MOSFET controller for redundant power supplies, featuring VCC + 5V charge-pump gate drive, programmable soft-start via TIMER pin, reverse-current detection (30 mV threshold), and open-drain FAULT output. It isolates failed supplies from the bus in <1 µs and operates across –40°C to +85°C in 8-pin µMAX® packaging.
For engineers reviewing the MAX8536EUA+ datasheet, MAX8536EUA+ pinout, MAX8536EUA+ application, or MAX8536EUA+ equivalent, key selection criteria include its 3.3V/5V bus compatibility, adjustable overvoltage/undervoltage thresholds, gate-drive current up to 33 µA (VCC = 5V), reverse-current blank time of 500 ms, and fault-latching behavior for OVP/IREVERSE conditions.
Technical Context
The MAX8536EUA+ implements a dual-mode TIMER input: a resistor-to-ground sets charge-pump frequency (100–500 kHz) for controlled MOSFET turn-on, while logic-level signals enable/disable gate drive. Its internal 1.25V reference supports externally adjustable UVP/OVP thresholds via resistor dividers on UVP and OVP pins.
It monitors forward current (VCC − CS > 10 mV typ) and reverse current (CS − VCC > 30 mV typ) with 500 ms startup blanking, detects internal VCC overvoltage (14.5 V max), and latches faults on OVP or IREVERSE - requiring VCC or TIMER cycle to reset. Gate discharge current reaches 300 mA at VCC + 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Input Range | 3.0 V to 5.5 V - supports direct connection to 3.3V or 5V system rails without external regulation. |
| Charge-Pump Output | VCC + 5 V - drives n-channel MOSFET gates above source voltage to ensure full enhancement in low-voltage ORing applications. |
| Reverse-Current Threshold | 30 mV (typ) - sets precise detection point for backfeed protection using external MOSFET RDS(ON). |
| Gate Drive Current | 33 µA (max, VCC = 5V, ITIMER = 0 µA) - sufficient to charge typical n-MOSFET gate capacitance with controlled slew rate. |
| Fault Response Time | <1 µs - isolates faulty supply before bus voltage collapse affects parallel units in N+1 redundant systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and telecom power subsystems with extended thermal margins. |
| FAULT Output Type | Open-drain logic-low - simplifies wired-OR fault bus implementation across multiple controllers. |
Pinout & Package
Package: 8-pin µMAX® (3mm × 3mm, 0.5mm pitch), thermally enhanced for high-current ORing applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | Charge-pump gate drive output | Drives n-MOSFET gate to VCC + 5V; bypass with 0.01 µF capacitor to GND for stability. |
| GND | Power and signal reference ground | Common return path for all internal circuits and external MOSFET source connections. |
| VCC | Main power supply input | Accepts 3.0–5.5 V; powers internal logic and charge pump; bypass with 0.1 µF capacitor. |
| UVP | Adjustable undervoltage protection input | Resistor-divider from VCC to GND sets trip threshold ≥2.5 V; left floating disables UVP. |
| TIMER | Programmable soft-start / enable control | Resistor-to-GND sets charge-pump frequency (100–500 kHz); logic-high enables max frequency (550 kHz); logic-low disables gate drive. |
| OVP | Adjustable overvoltage protection input | Resistor-divider from CS to GND sets trip threshold; tied to GND disables OVP. |
| FAULT | Open-drain fault indicator | Pulled low during OVP, UVP, or latched IREVERSE fault; requires external pull-up (≥50 kΩ). |
| CS | Current-sense input | Connected to positive bus rail; senses VDS across external MOSFET(s) to detect forward/reverse current flow. |
Key Features
| Feature | Design Value |
|---|---|
| ORing MOSFET Drive for 3.3V/5V Bus | Enables efficient replacement of lossy Schottky diodes in low-voltage redundant supplies, eliminating ~0.4 V forward drop and associated heat. |
| Sub-microsecond Fault Isolation | Shuts down gate drive in <1 µs upon reverse-current or overvoltage detection, preventing bus contamination in multi-supply architectures. |
| Programmable Soft-Start | Single external TIMER resistor controls MOSFET turn-on slew rate, reducing inrush current and avoiding bus droop during power-up. |
| Latched Fault Protection | OVP and IREVERSE faults persist until VCC or TIMER is cycled - ensures failed supply remains isolated until manual/system-initiated reset. |
| Integrated Charge Pump | Generates VCC + 5V locally - eliminates need for external high-side gate driver or bootstrap circuitry in n-MOSFET ORing designs. |
Applications
| Silver Box Power Supplies | Blade Server Redundant Power |
|---|---|
|
Use Scenario: Dual 5V Silver Box modules feeding shared motherboard bus in enterprise servers. IC Role / Device Role / Timing Role: ORing controller enabling seamless load sharing and automatic isolation of failed module. Use Value: Eliminates diode-based ORing losses (up to 3 W per rail), improves system efficiency by >1.5% at full load, and maintains bus voltage within ±25 mV during switchover. |
Use Scenario: Hot-swappable 3.3V power modules in telecom blade chassis with N+1 redundancy. IC Role / Device Role / Timing Role: Real-time reverse-current monitor and fast-shutdown actuator for individual module outputs. Use Value: Prevents backfeed into a removed or shorted module within 800 ns, preserving uptime of remaining modules and avoiding cascading failures. |
| Network Equipment Rectifiers | High-Availability Telecom Systems |
|
Use Scenario: DC-DC rectifier outputs paralleled at 5V for packet-switch fabric line cards. IC Role / Device Role / Timing Role: Voltage-drop sensing and gate control for n-channel MOSFETs replacing Schottky diodes. Use Value: Reduces conduction loss by 75% vs. 40V Schottky, lowering rectifier temperature rise by 18°C at 20 A and extending MTBF. |
Use Scenario: Dual 3.3V hot-swap power inputs to base station control unit with strict fault containment requirements. IC Role / Device Role / Timing Role: Latched fault manager that holds off failed supply until maintenance intervention. Use Value: Meets GR-1089 Class B immunity for conducted transients by limiting fault propagation to single power path, satisfying NEBS Level 3 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ORing MOSFET controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5050-1MMX/NOPB | Fixed 6V gate drive; no adjustable UVP/OVP; no latched IREVERSE; 12V VCC only. | Designed for 12V systems only; lacks programmable soft-start and reverse-current blanking. | Select when cost sensitivity outweighs flexibility; not suitable for 3.3V bus or latched-fault requirements. |
| TPS2410PWR | Supports 3–16.5V VCC; includes internal 5.5V LDO; non-latching reverse-current response; 2.5 µs fault response. | Broader input range but slower isolation; no internal charge pump - requires external gate driver for n-MOSFETs. | Prefer for mixed-voltage systems where integrated LDO simplifies biasing, but avoid where sub-µs isolation is mandatory. |
Compared with LM5050-1MMX/NOPB and TPS2410PWR, the MAX8536EUA+ uniquely delivers 3.3V/5V compatibility, VCC + 5V integrated charge pump, 500 ms reverse-current blanking, and latched OVP/IREVERSE - making it the only option meeting strict fault containment and low-voltage ORing requirements in telecom and server power subsystems.
Availability
MAX8536EUA+ is available at Aetrix Electronics and suitable for silver box power supplies, blade server redundant power, and network equipment rectifiers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MAX8536EUA+ 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 MAX8535/MAX8536/MAX8585 family was engineered specifically for high-reliability redundant power architectures - delivering ultrafast fault isolation, integrated gate driving, and minimal external component count in space-constrained systems.
FAQ
What is the maximum VCC voltage rating for MAX8536EUA+?
The MAX8536EUA+ has an absolute maximum VCC rating of +6 V. Its operational VCC range is 3.0 V to 5.5 V, optimized for 3.3V and 5V bus systems. Exceeding 6 V risks permanent damage, and operation above 5.5 V violates specified performance limits. The MAX8536EUA+ must be powered within this window to ensure correct charge-pump output (VCC + 5 V) and reliable fault detection.
How does the TIMER pin function in MAX8536EUA+?
The TIMER pin on the MAX8536EUA+ serves two roles: configuring soft-start slew rate and enabling/disabling gate drive. A resistor to ground sets charge-pump frequency (100–500 kHz), controlling MOSFET turn-on speed. Pulling TIMER below 0.5 V disables the charge pump and turns off the gate; pulling above 1.25 V enables maximum frequency (550 kHz). This dual functionality eliminates need for separate enable and timing components.
Does MAX8536EUA+ support latched or auto-retry fault behavior?
The MAX8536EUA+ implements latched fault behavior for overvoltage (OVP) and reverse-current (IREVERSE) conditions - once triggered, gate drive remains off until VCC or TIMER is cycled. Undervoltage (UVP) faults are non-latching and clear automatically when VCC rises above threshold. This ensures persistent isolation of faulty supplies in N+1 systems, preventing uncontrolled re-engagement without explicit reset.
What is the reverse-current detection threshold of MAX8536EUA+?
The MAX8536EUA+ detects reverse current when CS − VCC exceeds 30 mV (typical), with specification range of 20 mV to 40 mV over temperature. This threshold is fixed and referenced to the internal 1.25 V bandgap, enabling precise backfeed detection based solely on external MOSFET RDS(ON). Startup blanking lasts 500 ms (typ) to prevent false triggering during power-up transients.
Can MAX8536EUA+ drive both single and dual MOSFET configurations?
Yes - the MAX8536EUA+ supports both configurations. In dual-MOSFET setups (source-to-source), it monitors total VDS for forward/reverse current. In single-MOSFET mode (source to VCC, drain to CS), it functions without OVP capability - ideal for simplified ORing where overvoltage protection is handled upstream. Layout guidelines emphasize Kelvin sensing at MOSFET terminals to maintain accuracy in either topology.
MAX8536EUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- N+1 ORing Controller
- FET Type:
- N-Channel
- Ratio - Input:Output:
- N:1
- Internal Switch(s):
- No
- Delay Time - ON:
- -
- Delay Time - OFF:
- 200 ns
- Current - Output (Max):
- -
- Current - Supply:
- 2 mA
- Voltage - Supply:
- 3V ~ 5.5V
- Applications:
- Redundant Power Supplies, Telecom Infrastructure
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX8536EUA+ FAQ
1.How can I place an order for MAX8536EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8536EUA+ 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 MAX8536EUA+ reliable?
The price and inventory of MAX8536EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8536EUA+ is usually 5 days.
3.What payment methods are accepted for MAX8536EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8536EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8536EUA+?
MAX8536EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8536EUA+ 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 MAX8536EUA+?
For technical support, including MAX8536EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8536EUA+ requirements.
6.How does Aetrix verify that MAX8536EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX8536EUA+ 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 MAX8536EUA+ meets industry standards.
7.What is the process for return or replacement of MAX8536EUA+?
All MAX8536EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8536EUA+, 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 MAX8536EUA+ part is unused and in its original packaging.
Return procedure for MAX8536EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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