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Analog Devices Inc./Maxim Integrated MAX8518EUB+
- Part No.:
- MAX8518EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
MAX8518EUB+.pdf
- Description:
- IC REG LINEAR POS ADJ 1A 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:149
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Product details
Overview
MAX8518EUB+ from Maxim Integrated is a 1A, low-dropout linear regulator with PMOS pass transistor architecture, operating from 1.425V to 3.6V input and delivering adjustable output (0.5V to VIN − 0.2V) with ±1.4% accuracy over 0°C to +85°C. It features a 150ms power-on reset (POR) open-drain output, 200mV dropout at full load, and supports ceramic capacitors (1μF IN / 4.7μF OUT) for compact server and optical module power rails.
For engineers reviewing the MAX8518EUB+ datasheet, MAX8518EUB+ pinout, MAX8518EUB+ application, or MAX8518EUB+ equivalent, this page delivers verified technical context, validated pin functions, real-world transient response data (45mV deviation for 20mA→1A step), and confirmed alternative LDOs with POR functionality - all critical for post-regulator selection in space-constrained, thermally demanding embedded systems.
Technical Context
The MAX8518EUB+ uses an internal p-channel MOSFET pass device (100mΩ typ) enabling stable regulation down to 1.425V input without base-drive current penalties. Its feedback loop references a precise 500mV FB threshold (±7mV over temperature), supporting accurate adjustable outputs via external resistor dividers.
It integrates dedicated POR logic with 105–210ms rising delay and ±10% trip hysteresis (440–460mV falling threshold), independent of enable state. Thermal shutdown activates at +165°C junction temperature and recovers at +150°C, while short-circuit current limit holds at 1.6–2.4A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.425V to 3.6V - enables direct regulation from single Li-ion or multi-cell battery stacks and intermediate supply rails. |
| Output Current | 1A continuous - sufficient for powering FPGA I/O banks, ASIC cores, or high-speed SerDes transceivers. |
| Dropout Voltage | 200mV max at 1A - minimizes power loss and heat generation in low-headroom applications like 1.8V-to-1.5V post-regulation. |
| Output Accuracy | ±1.4% over load/line/temp (0°C to +85°C) - ensures reliable voltage margining for DDR memory or processor VDDQ rails. |
| POR Delay Time | 105–210ms (typ 150ms) - provides deterministic system reset timing aligned with power-rail stabilization. |
| Ground Current | 320μA typ at 100mA load; 340μA typ in dropout - enables low-quiescent operation in always-on subsystems. |
| Shutdown Current | <25μA - preserves battery life during deep-sleep modes in portable networking equipment. |
Pinout & Package
MAX8518EUB+ is housed in a 10-pin μMAX® package (3mm × 5mm) with exposed thermal pad (EP) soldered to PCB ground for optimal power dissipation. The package meets RoHS requirements (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | EN | Logic-enable input - pulled high to IN for normal operation; driven low to enter <25μA shutdown mode. |
| 2, 3 | IN | Main input supply - accepts 1.425V–3.6V; requires ≥1μF ceramic bypass to GND for stability. |
| 4, 10 | N.C. | No connection - pin 10 internally pulled down to GND via 10kΩ; must remain floating. |
| 6 | GND | Power and signal ground - dual-purpose thermal path; must connect to large PCB ground plane. |
| 7 | FB | Feedback reference node - senses 500mV threshold; sets output via R1/R2 divider (VOUT = 0.5V × (1 + R1/R2)). |
| 8, 9 | OUT | Regulated output - delivers up to 1A; requires ≥4.7μF low-ESR ceramic capacitor to GND for transient immunity. |
| 5 | POR | Open-drain power-on reset - transitions high 150ms after VOUT reaches 90% of target; requires external pullup to IN. |
| EP | GND (exposed pad) | Thermal conduction path - must be soldered to PCB ground plane with multiple vias for ≤45°C/W θJA. |
Key Features
| Feature | Design Value |
|---|---|
| PMOS Pass Transistor | 100mΩ typical on-resistance eliminates base-drive current, reducing ground current by >50% vs. PNP-based LDOs under heavy load. |
| Fast Transient Response | 45mV output deviation for 20mA→1A load step (with 4.7μF COUT) - maintains signal integrity in burst-mode processors and optical drivers. |
| Integrated POR Output | Dedicated 150ms reset timer with ±10% hysteresis - replaces discrete RC reset ICs and simplifies BOM for telecom base stations. |
| Ceramic Capacitor Compatibility | Stable with 1μF input / 4.7μF output ceramics - avoids bulkier, less reliable tantalum or electrolytic capacitors in high-reliability modules. |
| Thermal & Short-Circuit Protection | Auto-recovering shutdown at +165°C junction temp and 2A current limit - prevents catastrophic failure during sustained overload in sealed enclosures. |
Applications
| Optical Transceiver Modules | Server Memory Subsystems |
|---|---|
Use Scenario: Powering 25G/100G SFP28/CFP2 analog driver and TIA circuits requiring ultra-low noise and fast load response. IC Role / Device Role / Timing Role: Post-regulator for clean 1.2V/1.8V analog supply, synchronized with POR to hold laser bias until rail stabilization. Use Value: 45mV transient deviation and 150ms POR ensure bit-error-rate compliance during hot-plug events and link training sequences. |
Use Scenario: Supplying DDR4/DDR5 VPP or VDDQ rails in rack-mounted servers where thermal density exceeds 2W/cm². IC Role / Device Role / Timing Role: Low-dropout point-of-load regulator with exposed-pad thermal path, enabling 1A delivery in 3mm×5mm footprint. Use Value: 200mV dropout at 1A reduces power loss by 200mW vs. legacy LDOs, directly lowering board-level thermal load in air-cooled chassis. |
| 5G Radio Unit Power Management | Industrial Edge AI Accelerators |
Use Scenario: Regulating power for RF front-end FEMs and clock distribution ICs in outdoor macro base stations operating from -40°C to +85°C. IC Role / Device Role / Timing Role: Input-stage LDO preceding DC-DC converters, providing clean bias for PLLs and ADCs with POR-aligned startup sequencing. Use Value: ±1.4% output accuracy over full temperature range eliminates need for calibration compensation in field-deployed units. |
Use Scenario: Powering vision-processing SoCs (e.g., NVIDIA Jetson Orin) in factory-floor edge inference nodes with constrained PCB area. IC Role / Device Role / Timing Role: Compact 1A adjustable LDO with POR output used for controlled boot of GPU and memory controllers. Use Value: 10-pin μMAX package with EP allows >1.5W dissipation in <15mm² layout area - critical for fanless, sealed enclosure designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications with power-on reset functionality.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A8300RGRT | 2A output, 1.1V–3.35V input, 125mV dropout, no integrated POR - requires external reset IC. | Better suited for higher-current FPGA core rails but adds component count and timing complexity. | Select when >1A output or lower dropout is mandatory; accept added BOM cost and layout area for external POR. |
| ADP1740ARDZ-1.2-R7 | 1A output, 1.6V–3.6V input, 170mV dropout, 1.2V fixed output, no POR - lacks adjustability and reset function. | Ideal for cost-sensitive, fixed-voltage applications like sensor hubs where POR is handled elsewhere. | Choose only if output voltage is fixed at 1.2V and system-level reset is already implemented; avoid for adjustable or POR-dependent designs. |
Compared with MAX8518EUB+, TPS7A8300RGRT offers higher current and lower dropout but increases design complexity with external POR, while ADP1740ARDZ-1.2-R7 sacrifices adjustability and POR for lower unit cost - making MAX8518EUB+ the optimal balance of integration, precision, and thermal performance for compact, reset-critical LDO applications.
Availability
MAX8518EUB+ is available at Aetrix Electronics and suitable for optical modules, 5G radio units, server memory subsystems, industrial edge AI accelerators, and base station power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8518EUB+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.
The MAX8516/MAX8517/MAX8518 family was designed specifically for low-input-voltage, high-current post-regulation in space-constrained telecom and datacom systems where thermal efficiency, transient response, and integrated power-good/reset signaling are critical.
FAQ
What is the exact POR delay specification for MAX8518EUB+?
The MAX8518EUB+ POR output transitions high 105ms to 210ms after the regulated output rises above 90% of its nominal value, with a typical delay of 150ms. This timing is guaranteed over the full -40°C to +85°C operating temperature range and is independent of input voltage between 1.425V and 3.6V. The MAX8518EUB+ POR circuit includes built-in hysteresis to prevent chatter during marginal conditions.
Can MAX8518EUB+ operate with input voltage below 1.425V?
No - the MAX8518EUB+ has a hard input undervoltage lockout (UVLO) threshold of 1.32V to 1.38V (with 70mV hysteresis). Operation below 1.425V is not specified or guaranteed; attempting to power the MAX8518EUB+ below this minimum violates absolute maximum ratings and may cause unstable regulation or failure to start. The MAX8518EUB+ requires ≥1.425V to maintain ±1.4% output accuracy and full 1A capability.
What are the recommended capacitor values for MAX8518EUB+ in a 1A application?
For full 1A operation, the MAX8518EUB+ requires a minimum 1μF ceramic capacitor between IN and GND, and a minimum 4.7μF ceramic capacitor between OUT and GND. These values ensure stability across -40°C to +85°C and limit load-transient deviation to 45mV. For improved ripple suppression, larger output capacitors up to 50μF ceramic are supported. The MAX8518EUB+ is incompatible with high-ESR electrolytics for primary bypassing.
Does MAX8518EUB+ support adjustable output voltages, and what is the minimum achievable value?
Yes - the MAX8518EUB+ is fully adjustable via an external resistor divider connected to the FB pin, with output voltage calculated as VOUT = 0.5V × (1 + R1/R2). The minimum output is 0.5V (when R1 = 0Ω), and the maximum is VIN − 0.2V. This allows precise setting of common logic rails including 0.8V, 0.9V, 1.2V, 1.8V, and 2.5V. The FB pin's 500mV reference has ±7mV tolerance over temperature, ensuring tight output accuracy.
How does thermal protection work in MAX8518EUB+ during sustained overload?
The MAX8518EUB+ incorporates thermal-overload protection that disables the output when junction temperature reaches +165°C and re-enables it once temperature falls to +150°C. During fault conditions, current limiting holds output current at 1.6–2.4A. This auto-recovering cycle continues until the overload or short circuit is removed. The exposed pad (EP) must be soldered to a robust ground plane to achieve the rated 824mW power dissipation at +70°C ambient.
MAX8518EUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 3.4V
- Voltage Dropout (Max):
- 0.2V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 320 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Power Good
- Protection Features:
- Over Temperature, Short Circuit, Soft Start, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX-EP
MAX8518EUB+ FAQ
1.How can I place an order for MAX8518EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8518EUB+ 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 MAX8518EUB+ reliable?
The price and inventory of MAX8518EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8518EUB+ is usually 5 days.
3.What payment methods are accepted for MAX8518EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8518EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8518EUB+?
MAX8518EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8518EUB+ 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 MAX8518EUB+?
For technical support, including MAX8518EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8518EUB+ requirements.
6.How does Aetrix verify that MAX8518EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX8518EUB+ 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 MAX8518EUB+ meets industry standards.
7.What is the process for return or replacement of MAX8518EUB+?
All MAX8518EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8518EUB+, 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 MAX8518EUB+ part is unused and in its original packaging.
Return procedure for MAX8518EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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