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Analog Devices Inc./Maxim Integrated MAX1709EUI+
- Part No.:
- MAX1709EUI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX1709EUI+.pdf
- Description:
- IC REG BOOST ADJ 7.5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
MAX1709EUI+ from Maxim Integrated is a high-frequency, low-noise step-up DC-DC converter IC with integrated 10A RMS n-channel power MOSFET, delivering up to 4A output current at 3.3V or 5V (fixed) or adjustable 2.5V–5.5V, operating from input as low as 0.7V, and featuring 600kHz fixed-frequency PWM for predictable noise filtering - used in routers, servers, and RF power amplifier local conversion.
For engineers reviewing the MAX1709EUI+ datasheet, MAX1709EUI+ pinout, MAX1709EUI+ application, or MAX1709EUI+ equivalent, key selection considerations include RMS switch current rating (10ARMS), TSSOP-EP thermal performance (1.2°C/W junction-to-pad), dual-mode output configuration (3.3/5 pin + FB), soft-start/current-limit programmability via SS/LIM, and external clock synchronization range (350–1000kHz).
Technical Context
The MAX1709EUI+ implements constant-frequency current-mode PWM control with internal 600kHz oscillator or external synchronization capability. Its architecture integrates a 10ARMS-rated n-channel switch, reference voltage (1.24–1.28V), and dual-mode feedback (internal 3.3V/5V or external resistor-divider from 2.5V to 5.5V).
Control logic uses ONA/ONB inputs with ~0.15V hysteresis for push-button or logic-level on/off sequencing; soft-start and current limit are independently set via capacitor/resistor on SS/LIM pin, enabling design flexibility for battery-powered systems requiring controlled inrush and load-matching current limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 4A continuous, enabled by 10ARMS on-chip n-channel MOSFET - supports high-power local conversion without external switch. |
| Input Voltage Range | 0.7V to 5.0V - enables direct operation from single-cell LiFePO₄, NiMH, or regulated 1.2V/2.5V/3.3V rails. |
| Switching Frequency | Fixed 600kHz (±100kHz) or externally synchronized 350–1000kHz - ensures deterministic EMI spectrum for post-filtering in noise-sensitive RF PA supplies. |
| Output Voltage Options | Internally fixed 3.3V or 5.0V (via 3.3/5 pin), or adjustable 2.5V–5.5V using external resistor divider at FB - supports multi-rail system flexibility. |
| Quiescent Power | <1mW shutdown current - extends battery life in always-on or intermittent-use portable infrastructure equipment. |
| Thermal Resistance | 1.2°C/W junction-to-exposed-pad - enables high continuous power delivery when mounted on ≥1in² copper with thermal vias. |
| Soft-Start Control | Capacitor-programmable rise time on SS/LIM pin - prevents inrush current damage to input capacitors and upstream regulators. |
Pinout & Package
The MAX1709EUI+ is housed in a 28-pin TSSOP-EP (exposed pad) package optimized for thermal dissipation, with pins 2–4, 18–23, and EP internally connected to LX and PGND respectively for high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ONA | On-control input | Active-high enable: device powers on when ONA = high OR ONB = low - supports momentary pushbutton interface with microcontroller coordination. |
| ONB | Shutdown input | Active-high disable: device shuts down only when ONA = low AND ONB = high - enables robust logic-level off sequencing. |
| LX (Pins 2,3,4) | Switch drain node | High-current switching output tied to external Schottky diode anode - requires short, wide traces to minimize ringing and EMI. |
| PGND (Pins 11,12,13,14,15,16,17,24,25) | Power ground return | Source connection for internal MOSFET - must be star-connected to input/output capacitor grounds to avoid ground bounce in high-dI/dt paths. |
| SS/LIM | Soft-start & current-limit adjust | Capacitor sets soft-start time; resistor to GND scales current limit from 7.5A down to 3.5A - enables safe startup into large capacitive loads. |
| 3.3/5 | Output voltage select | Logic level selects internal 3.3V (low) or 5.0V (high) regulation - eliminates external feedback resistors when fixed output is sufficient. |
| CLK | External clock input | Accepts 350–1000kHz square wave for synchronized switching - critical for avoiding beat frequencies in multi-converter systems. |
| FB | Feedback input | Regulates to 1.24V reference - connects to GND for fixed output or to resistor divider for adjustable output (2.5V–5.5V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10ARMS n-channel switch | Eliminates need for external high-current MOSFET and gate driver - reduces BOM count and PCB area in space-constrained server/rack modules. |
| Dual-mode output configuration | Supports both fixed 3.3V/5V and adjustable 2.5V–5.5V outputs via same footprint - simplifies design reuse across multiple voltage rail requirements. |
| Programmable soft-start & current limit | Independent capacitor/resistor control on SS/LIM pin - allows precise inrush management and dynamic load adaptation without firmware changes. |
| Low-noise 600kHz fixed-frequency operation | Constrains EMI to fundamental + harmonics - enables compact LC filtering for RF PA bias supplies where spectral purity is critical. |
| 0.7V minimum input voltage | Enables direct regulation from depleted single-cell batteries or ultra-low-voltage sources - extends runtime in portable telecom infrastructure. |
Applications
| Router Local Conversion | Server Board Power |
|---|---|
Use Scenario: Converting 3.3V backplane supply to 5V for PCIe slot peripherals in enterprise routers. IC Role / Device Role / Timing Role: Primary step-up regulator supplying stable 5V at up to 4A with low output ripple. Use Value: Enables compact, high-efficiency local regulation without discrete FET + controller solution - reduces thermal density on dense router line cards. | Use Scenario: Generating 3.3V from 1.2V CPU core rail to power DDR memory termination in high-end servers. IC Role / Device Role / Timing Role: High-current boost converter delivering 4A at 3.3V with tight load regulation (±0.45%/A). Use Value: Supports fast transient response during memory burst access - maintains VTT stability within ±3% under 2A step load changes. |
| RF PA Bias Supply | Workstation GPU Auxiliary Rail |
Use Scenario: Providing clean 5V bias to 3.6V or 5V RF power amplifiers in handheld communications equipment. IC Role / Device Role / Timing Role: Low-noise, synchronizable boost converter operating at 600kHz or externally locked frequency. Use Value: Predictable harmonic placement avoids IF band interference - meets spectral mask requirements for cellular transceivers. | Use Scenario: Delivering 4A at 3.3V to GPU auxiliary circuits (e.g., VRM controllers, sensor interfaces) in professional workstations. IC Role / Device Role / Timing Role: High-RMS-current DC-DC converter with exposed-pad thermal path for sustained 4A operation. Use Value: Maintains <85°C junction temperature under full load with standard 1in² copper - avoids thermal throttling in fanless workstation enclosures. |
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 |
|---|---|---|---|
| MAX1708ESE+ | Lower 2.4A output rating, 6ARMS switch, narrow SO-16 package, no exposed pad - reduced thermal capacity and peak current capability. | Suitable only for ≤2A continuous loads; cannot sustain 4A output without derating or forced cooling. | Select MAX1708ESE+ only when board space is constrained and output current requirement is ≤2A - not a drop-in replacement for MAX1709EUI+. |
| TPS61088RHLR | 10A switch current, 6.5V max output, 2.7–12V input, 600kHz/1.2MHz selectable frequency - wider input range but no 0.7V startup capability. | Requires ≥2.7V input; unsuitable for single-cell battery or ultra-low-voltage applications where MAX1709EUI+ excels. | Choose TPS61088RHLR for higher-input industrial systems needing >5V output or dual-frequency flexibility - not interchangeable in sub-1V input designs. |
Compared with MAX1708ESE+ and TPS61088RHLR, the MAX1709EUI+ uniquely combines 0.7V startup, 10ARMS capability in TSSOP-EP, and dual-mode output selection - making it the only option for high-current, ultra-low-input, thermally demanding local conversion in telecom and computing infrastructure.
Availability
MAX1709EUI+ is available at Aetrix Electronics and suitable for routers, servers, and RF power amplifier bias supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1709EUI+ 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 MAX1709 product line delivers high-efficiency, high-current step-up conversion with integrated power switches and advanced control features - engineered specifically for space-constrained, thermally sensitive local power delivery in networking and infrastructure equipment.
FAQ
What is the minimum input voltage required for MAX1709EUI+ startup?
The MAX1709EUI+ requires a minimum startup voltage of 0.9V to 1.1V (typical 1.0V) at room temperature with light load. Once started, it sustains operation down to 0.7V input due to bootstrap operation - a key differentiator for single-cell battery and ultra-low-voltage rail applications. This behavior is confirmed in the Electrical Characteristics table (Note 4 and Note 5) and Typical Operating Characteristics (Figure TOC07).
Can MAX1709EUI+ operate with an external clock signal, and what is the supported frequency range?
Yes, the MAX1709EUI+ supports external clock synchronization via the CLK pin over 350kHz to 1000kHz. It locks to the external signal within two cycles and reverts to its internal 600kHz oscillator within ~40µs if the clock stops. This capability is explicitly specified in the Electrical Characteristics table and Detailed Description section - enabling EMI management in multi-converter systems.
How is output voltage configured on MAX1709EUI+, and what are the options?
The MAX1709EUI+ supports dual-mode output: fixed 3.3V (3.3/5 = GND) or 5.0V (3.3/5 = VOUT), or adjustable 2.5V–5.5V using external resistor divider at FB pin. The FB pin regulates to 1.24V, and the 3.3/5 pin must be grounded when using external feedback. This configuration method is fully documented in the Pin Description and Operation sections of the datasheet.
What is the RMS current rating of the internal switch in MAX1709EUI+, and how does it compare to MAX1709ESE?
The MAX1709EUI+ has a confirmed 10ARMS internal n-channel switch rating, while the MAX1709ESE is rated for 6ARMS - both stated in the General Description, Ordering Information, and Detailed Description sections. This 67% higher RMS rating enables continuous 4A output in the MAX1709EUI+ under typical thermal conditions, whereas the ESE variant is limited to 2.4A continuous.
Does MAX1709EUI+ include soft-start functionality, and how is it implemented?
Yes, the MAX1709EUI+ provides programmable soft-start via the SS/LIM pin: connecting a capacitor to GND controls ramp time (C3 ≈ 3.2 × tSS µF), while adding a resistor to GND scales current limit from 7.5A down to 3.5A. This dual-function pin is detailed in the Pin Description, Operation, and Design Procedure sections - enabling safe startup into large capacitive loads without external circuitry.
MAX1709EUI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Programmable)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5V
- Voltage - Output (Min/Fixed):
- 2.5V (3.3V, 5V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 7.5A (Switch)
- Frequency - Switching:
- 350kHz ~ 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
MAX1709EUI+ FAQ
1.How can I place an order for MAX1709EUI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1709EUI+ 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 MAX1709EUI+ reliable?
The price and inventory of MAX1709EUI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1709EUI+ is usually 5 days.
3.What payment methods are accepted for MAX1709EUI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1709EUI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1709EUI+?
MAX1709EUI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1709EUI+ 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 MAX1709EUI+?
For technical support, including MAX1709EUI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1709EUI+ requirements.
6.How does Aetrix verify that MAX1709EUI+ is sourced from the original manufacturer or authorized distributors?
All MAX1709EUI+ 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 MAX1709EUI+ meets industry standards.
7.What is the process for return or replacement of MAX1709EUI+?
All MAX1709EUI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1709EUI+, 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 MAX1709EUI+ part is unused and in its original packaging.
Return procedure for MAX1709EUI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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