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Analog Devices Inc./Maxim Integrated MAX618EEE+
- Part No.:
- MAX618EEE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX618EEE+.pdf
- Description:
- IC REG BOOST ADJ 1.4A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:669
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Product details
Overview
The MAX618EEE+ from Analog Devices is a CMOS PWM step-up DC-DC converter with an integrated 28V, 2A internal N-channel MOSFET switch, operating from +3V to +28V input and delivering up to +28V output at 500mA (at +12V). It features 250kHz fixed-frequency switching, Idle Mode™ for light-load efficiency optimization, and a thermally enhanced 16-pin QSOP package rated for 1W dissipation. It is used in industrial +24V systems, LCD displays, and palmtop computers.
For engineers reviewing the MAX618EEE+ datasheet, MAX618EEE+ pinout, MAX618EEE+ application, or MAX618EEE+ equivalent, key selection criteria include its wide 3–28V input range, 1.5V feedback reference, 500μA no-load supply current, adaptive slope compensation, and compatibility with boost/SEPIC/flyback topologies - all critical for battery-powered and high-voltage rail generation designs.
Technical Context
The MAX618EEE+ employs a dual-loop control architecture: a voltage-controlled loop dominates low-frequency error regulation, while a current-controlled loop enhances stability across wide VIN/VOUT ranges. Its 250kHz oscillator drives continuous-conduction PWM at medium-to-heavy loads and transitions to cycle-skipping Idle Mode below ~0.02–0.25A (depending on VIN/VOUT), reducing inductor current and minimizing switching losses.
Internal circuitry includes a 3.1V LDO regulator (VL) with 100mV dropout, powering bias circuits and enabling dual-supply operation; VL must be ≥2.7V for undervoltage lockout release. The LX pin supports up to 28V drain-source voltage and 2.2A peak switch current, with 0.3Ω typical on-resistance and adaptive slope compensation implemented via a single external capacitor (CCOMP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3V to +28V - supports direct connection to industrial 24V rails and wide-battery inputs without pre-regulation. |
| Output Voltage Range | Adjustable up to +28V - set via external resistor divider; FB threshold is precisely 1.50V (±30mV) for stable regulation. |
| Switch Current Limit | 2.2A typical - limits peak inductor current to protect internal MOSFET and maintain safe SOA under transient overload. |
| No-Load Supply Current | 500μA typical - enables >93% efficiency at light loads and extends battery life in standby mode. |
| Shutdown Current | 3μA typical - reduces system quiescent draw during inactive periods; output falls to VIN minus diode drop. |
| Switching Frequency | 250kHz (200–300kHz range) - allows compact 470μH inductors and ceramic output capacitors without audible noise. |
| LX On-Resistance | 0.3Ω typical - minimizes conduction loss and thermal rise in high-current boost paths. |
| Operating Temperature | -40°C to +85°C - qualified for industrial ambient environments without derating up to +70°C. |
Pinout & Package
The MAX618EEE+ is housed in a 16-pin QSOP package (3.9mm × 4.9mm, 1.0mm height) with exposed thermal pad equivalent in footprint to an industry-standard 8-pin SO but capable of dissipating up to 1W with proper copper layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 12, 16) | Analog and digital ground reference | Common return for feedback, bias, and logic; must be tied to PGND at single-point star ground to minimize noise coupling. |
| LX (Pins 2, 3, 4) | Drain of internal N-channel MOSFET | Connects to inductor; handles full switching current and 28V max voltage; requires low-inductance routing to reduce EMI. |
| SHDN (Pin 5) | Active-low shutdown control input | Pulling low disables regulator and reduces IN current to 3μA; must not exceed VL voltage (max 5.5V). |
| COMP (Pin 6) | Compensation node for error amplifier | Bypassed to GND with CCOMP (40–400nF); sets dominant pole and stabilizes loop across input/output variations. |
| FB (Pin 7) | Feedback input for output voltage sensing | Monitors resistor-divider output; 1.5V threshold enables precise VOUT setting (e.g., R1 = 100kΩ, R2 = 10kΩ → 16.5V). |
| IN (Pin 10) | Main power input for LDO and switch driver | Accepts 3–28V; bypassed with 1μF ceramic capacitor near pins 10/12 to suppress high-frequency ripple. |
| VL (Pin 11) | 3.1V LDO regulator output | Powers internal circuitry; requires 4.7μF ceramic bypass; can be overdriven by external 2.7–5.5V supply to improve gate drive efficiency. |
| PGND (Pins 13, 14, 15) | Power ground for internal switch source | Carries high pulsed currents; must be routed separately from analog GND and connected to GND at single point near LX/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2A, 28V MOSFET switch | Eliminates need for external high-voltage power FETs, reducing BOM count and PCB area in boost converters. |
| Idle Mode™ operation | Automatically switches from PWM to discontinuous-cycle mode below ~0.05–0.25A, cutting no-load current to 500μA and maintaining >85% efficiency at 1mA load. |
| Adaptive slope compensation | Stabilizes current-mode control across wide VIN/VOUT ratios using only one external capacitor (CCOMP), simplifying design vs. fixed-compensation ICs. |
| Thermally enhanced 16-pin QSOP | Dissipates up to 1W at +70°C ambient (15mW/°C derating above), enabling higher output power than standard 8-pin SO packages. |
| Dual-supply configuration support | Allows VL to be powered externally (2.7–5.5V) while IN supplies inductor voltage up to 28V - improves efficiency and decouples logic/bias from power path. |
| 3μA shutdown current | Enables ultra-low-power system sleep states; output collapses to VIN − VF(diode), preventing backfeed into source. |
Applications
| Industrial +24V Systems | LCD Displays |
|---|---|
Use Scenario: Generating regulated +28V bias for industrial PLC I/O modules powered from unregulated 24V DC rails. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing isolated high-voltage rail with tight line/load regulation and thermal robustness. Use Value: Eliminates need for external MOSFET and gate driver; 1W package dissipation supports continuous 500mA output without heatsink. | Use Scenario: Powering TFT-LCD backlight drivers and gate drivers requiring stable +12V to +20V from a single-cell Li-ion or 3.3V logic rail. IC Role / Device Role / Timing Role: High-efficiency boost converter with 250kHz switching to minimize EMI near sensitive display timing circuits. Use Value: 93% peak efficiency and 500μA quiescent current extend battery runtime; Idle Mode maintains >80% efficiency down to 1mA load. |
| Palmtop Computers | Portable Medical Instruments |
Use Scenario: Generating +15V for analog front-end op-amps and ADC references in handheld diagnostic devices. IC Role / Device Role / Timing Role: Compact, low-noise boost regulator with fast transient response for mixed-signal subsystems. Use Value: 16-pin QSOP fits space-constrained layouts; 2μs/div switching waveforms ensure clean power delivery without interfering with 12-bit ADC sampling. | Use Scenario: Providing isolated +24V for piezoelectric transducer drivers in portable ultrasound probes. IC Role / Device Role / Timing Role: High-voltage step-up controller supporting flyback topology with precise current limiting for safe energy delivery. Use Value: 2.2A switch current limit and thermal shutdown prevent device damage during probe coupling transients; -40°C to +85°C rating ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467EMS#TRPBF | Fixed 1.3MHz switching frequency; 40V internal switch; 1.25V FB reference; no Idle Mode | Better suited for ultra-compact designs needing smaller magnetics; less efficient below 10mA due to fixed-frequency operation | Select when board space is constrained and high-frequency EMI filtering is acceptable; avoid if <1mA quiescent current is required. |
| TPS61088RHLR | 12V max switch voltage; 8A peak current; 500kHz–2.2MHz programmable frequency; integrated soft-start | Optimized for USB PD and high-current consumer apps; insufficient for 28V output or industrial 24V input | Choose for cost-sensitive, high-output-current applications ≤12V; not viable for MAX618EEE+'s 28V output or 24V input use cases. |
Compared with LT3467EMS#TRPBF and TPS61088RHLR, the MAX618EEE+ uniquely balances wide 3–28V input, 28V output capability, sub-1mA quiescent operation, and thermal robustness in a mature industrial-grade package - making it irreplaceable for legacy +24V system upgrades and high-voltage portable instrumentation.
Availability
MAX618EEE+ is available at Aetrix Electronics and suitable for industrial +24V systems, LCD display power supplies, and palmtop computer auxiliary rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX618EEE+ 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, headquartered in Wilmington, MA.
The MAX618EEE+ belongs to Analog Devices' legacy high-voltage DC-DC converter product line, designed specifically for industrial, medical, and portable equipment requiring reliable boost conversion from wide-input rails with minimal external components.
FAQ
What is the maximum output voltage achievable with the MAX618EEE+?
The MAX618EEE+ supports an adjustable output voltage up to +28V, limited by its internal 28V-rated MOSFET switch and LX pin voltage rating. Output is set via an external resistor divider on the FB pin, where VOUT = 1.5V × (1 + R1/R2). Exceeding 28V risks permanent damage to the LX switch and violates absolute maximum ratings.
Can the MAX618EEE+ operate from a 3.3V input to generate 12V output?
Yes, the MAX618EEE+ operates from +3V to +28V input, including 3.3V. At VIN = 3.3V and VOUT = 12V, typical maximum output current is ~0.20A (per Table 3), limited by switch current and package thermal dissipation. Efficiency remains >85% at medium loads, supported by Idle Mode operation below ~50mA.
What is the purpose of the VL pin on the MAX618EEE+ and how should it be bypassed?
The VL pin is the 3.1V output of an internal LDO regulator that powers internal bias circuitry. It must be bypassed with a 4.7μF ceramic capacitor placed as close as possible to VL and GND pins. VL can also be overdriven by an external 2.7–5.5V supply to improve gate drive and efficiency - a key feature enabling dual-supply configurations in the MAX618EEE+.
Does the MAX618EEE+ support SEPIC or flyback topologies, or only boost?
The MAX618EEE+ supports boost, SEPIC, and flyback configurations per its detailed description and operating configurations section. Its current-mode control, adaptive slope compensation, and 28V LX rating make it suitable for all three - unlike basic boost-only controllers. Figure 1 shows boost; Figures 3 and 4 illustrate dual-supply variants applicable to SEPIC/flyback with appropriate transformer/inductor selection.
How does Idle Mode™ improve efficiency in the MAX618EEE+ at light loads?
Idle Mode™ in the MAX618EEE+ improves light-load efficiency by disabling continuous PWM switching and initiating cycles only when output voltage droop is detected. This reduces switching losses, gate drive losses, and inductor core/copper losses. At 1mA load, Idle Mode cuts supply current to ~500μA and maintains >80% efficiency - versus <50% for fixed-frequency operation at same load.
MAX618EEE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1.4A (Switch)
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX618EEE+ FAQ
1.How can I place an order for MAX618EEE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX618EEE+ 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 MAX618EEE+ reliable?
The price and inventory of MAX618EEE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX618EEE+ is usually 5 days.
3.What payment methods are accepted for MAX618EEE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX618EEE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX618EEE+?
MAX618EEE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX618EEE+ 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 MAX618EEE+?
For technical support, including MAX618EEE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX618EEE+ requirements.
6.How does Aetrix verify that MAX618EEE+ is sourced from the original manufacturer or authorized distributors?
All MAX618EEE+ 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 MAX618EEE+ meets industry standards.
7.What is the process for return or replacement of MAX618EEE+?
All MAX618EEE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX618EEE+, 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 MAX618EEE+ part is unused and in its original packaging.
Return procedure for MAX618EEE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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