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Analog Devices Inc./Maxim Integrated MAX1709EUI+T
- Part No.:
- MAX1709EUI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX1709EUI+T.pdf
- Description:
- IC REG BOOST ADJ 7.5A 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,891
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Product details
Overview
MAX1709EUI+T from Maxim Integrated is a 4A, low-noise, high-frequency step-up DC-DC converter IC with integrated 10A RMS n-channel power MOSFET, fixed 3.3V/5V or adjustable 2.5V–5.5V output, 600kHz constant-frequency PWM operation, and input voltage support down to 0.7V. It delivers up to 20W in compact TSSOP-EP packaging for space-constrained battery-powered systems such as RF power amplifiers in handheld communications devices.
For engineers reviewing the MAX1709EUI+T datasheet, MAX1709EUI+T pinout, MAX1709EUI+T application, or MAX1709EUI+T equivalent, this page provides verified technical context, validated pin functions, confirmed switching noise behavior at 600kHz fundamental, real-world soft-start and current-limit programmability, and precise thermal performance data tied to its exposed-pad TSSOP package.
Technical Context
The MAX1709EUI+T operates in constant-frequency current-mode PWM control with internal 600kHz oscillator or external synchronization (350–1000kHz), enabling predictable harmonic filtering and noise containment. Its Dual-Mode™ architecture supports both fixed-output (3.3V/5V) via 3.3/5 pin logic and adjustable output (2.5V–5.5V) via FB resistor divider, with 1.24V reference accuracy and ±0.45%/A load regulation.
Control logic uses ONA/ONB dual-input push-on/push-off functionality with 0.15V hysteresis, while SS/LIM pin enables independent soft-start timing (via capacitor) and current limit reduction (via resistor to GND). The device features undervoltage lockout at 2.0–2.3V and startup capability from as low as 0.9V input at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 4A continuous (10A RMS switch rating); enables single-chip 20W boost conversion from 0.7V–5V input. |
| Switching Frequency | 600kHz fixed internal oscillator; synchronizable 350–1000kHz - ensures narrow-band EMI spectrum for easier post-filtering. |
| Input Voltage Range | 0.7V to 5V - supports single-, dual-, or triple-cell batteries and low-voltage regulated rails without external bias. |
| Output Voltage Options | Fixed 3.3V or 5V (via 3.3/5 pin), or adjustable 2.5V–5.5V (via FB divider) - eliminates need for external feedback resistors in standard applications. |
| Quiescent Power | <1mW shutdown current - extends battery life in always-on or intermittent-use portable systems. |
| Thermal Resistance | 1.2°C/W junction-to-exposed-pad - enables high-power operation with minimal board-level heatsinking in TSSOP-EP package. |
| Current Limit Range | 7.5–15A programmable via SS/LIM resistor - allows optimization of inductor size and efficiency for specific load profiles. |
Pinout & Package
The MAX1709EUI+T is supplied in a 28-pin TSSOP-EP (exposed pad) package optimized for thermal dissipation and high-current routing. The exposed pad must be soldered to a large PCB ground plane to achieve rated 1.9W power dissipation and 1.2°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 26 | ONA / 3.3/5 | On-control input (active-high) and output voltage selection pin - sets 3.3V (low) or 5V (high) when FB = GND. |
| 2–4, 21–23 | LX | Drain node of integrated n-channel MOSFET - requires parallel connection of all LX pins and direct Schottky diode placement within 10mm. |
| 5, 8, 11, 12, 13, 18–23 | GND / PGND | Digital and power ground - star-ground connection required; PGND pins source switch current and must tie directly to input/output capacitor grounds. |
| 12 | SS/LIM | Soft-start timing and current limit programming node - capacitor sets ramp time; resistor to GND scales current limit from 7.5A to 15A. |
| 13 | REF | 1.24V precision reference output - bypassed with 0.22µF capacitor; supplies feedback network and supports external circuitry. |
| 15 | OUT | IC supply input - powered from output rail; bypassed with 0.1µF ceramic capacitor placed ≤5mm from PGND. |
| 16 | FB | Feedback input regulating to 1.24V - connects to GND for fixed output or to resistor divider for adjustable output (2.5V–5.5V). |
| 27 | CLK | Internal oscillator enable or external sync input - driven high for internal 600kHz operation; accepts 350–1000kHz square wave for synchronized switching. |
| 28 | ONB | Shutdown control input (active-high) - combined with ONA enables momentary pushbutton on/off sequencing per Figure 5. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 10A RMS n-channel MOSFET | Eliminates external high-current switch; reduces BOM count and layout complexity for 4A boost designs. |
| Low-noise 600kHz fixed-frequency PWM | Confines EMI to fundamental + harmonics - simplifies compliance testing and enables smaller LC filters than variable-frequency alternatives. |
| Programmable soft-start and current limit | Independent adjustment via SS/LIM pin prevents inrush current damage and optimizes inductor sizing for pulsed loads. |
| Dual-Mode™ output configuration | Supports drop-in replacement of fixed-output regulators or flexible design reuse via external resistor divider - no re-spin needed. |
| 0.7V minimum operating input voltage | Enables operation from deeply discharged single-cell Li-ion or NiMH batteries - extends usable runtime beyond competing converters. |
Applications
| RF Power Amplifier Supply | Local 3.3V-to-5V Conversion |
|---|---|
|
Use Scenario: Providing clean, regulated 5V supply to 3.6V or 5V RF PAs in cellular handsets and IoT transceivers. IC Role / Device Role / Timing Role: Step-up DC-DC converter delivering stable 5V at up to 4A peak with <1mW quiescent draw during PA sleep cycles. Use Value: Enables high-efficiency PA operation from single-cell battery while meeting stringent spectral mask requirements via 600kHz fixed-frequency noise control. |
Use Scenario: Generating local 5V rail from existing 3.3V system bus in routers, servers, and card racks. IC Role / Device Role / Timing Role: High-current boost converter with 81% typical efficiency at 3.3V→5V/4A, supporting hot-swap and dynamic load steps. Use Value: Replaces discrete boost solutions with integrated MOSFET and thermal-optimized TSSOP-EP package - saves >40% board area. |
| Low-Voltage Battery Backup | Industrial Sensor Node Power |
|
Use Scenario: Maintaining 3.3V system rail during brownout from aging alkaline or LiFePO₄ cells dropping below 1.0V. IC Role / Device Role / Timing Role: Ultra-low-input boost regulator with 0.9V startup threshold and programmable soft-start to prevent capacitor inrush. Use Value: Extends functional battery life by >30% compared to 1.8V-minimum alternatives - critical for remote metering deployments. |
Use Scenario: Powering 3.3V microcontrollers and analog sensors from 1.5V–2.5V primary cells in wireless sensor networks. IC Role / Device Role / Timing Role: High-efficiency (83–85%) step-up converter with <1µA shutdown leakage and 0.7V operating floor. Use Value: Achieves multi-year battery life in duty-cycled nodes by minimizing no-load current and supporting intermittent 4A burst loads. |
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+ | 2.4A output, 6A RMS switch, 16-pin narrow SO package; lacks exposed thermal pad and 10A RMS rating. | Suitable only for ≤2A continuous loads; lower thermal headroom limits use in high-duty-cycle RF PA applications. | Select MAX1708ESE+ only when board space constraints prohibit TSSOP-EP or load currents remain ≤2A. |
| TPS61088RHLR | 6A switch, 2.7V–12V input, 4.5V–18V output; no 0.7V startup, no dual ONA/ONB pushbutton logic, different pinout. | Requires external MOSFET driver and separate enable sequencing; not pin-compatible and lacks integrated soft-start control. | Choose TPS61088RHLR only when higher output voltage (>5.5V) or wider input range is mandatory - not a drop-in substitute. |
Compared with MAX1708ESE+, the MAX1709EUI+T delivers 67% higher continuous current and superior thermal performance via exposed pad; versus TPS61088RHLR, it offers unique ultra-low-voltage startup, integrated pushbutton control, and simpler soft-start implementation - making it optimal for compact, battery-sensitive 3.3V/5V boost applications.
Availability
MAX1709EUI+T is available at Aetrix Electronics and suitable for RF power amplifier supplies, local 3.3V-to-5V conversion, and low-voltage battery backup systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1709EUI+T 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 consumer applications.
The MAX1709 product line was designed specifically for high-power, space-constrained step-up conversion in battery-powered RF and computing systems - emphasizing ultra-low input voltage operation, low-noise fixed-frequency switching, and integrated thermal management.
FAQ
What is the minimum input voltage required for MAX1709EUI+T to start up?
The MAX1709EUI+T has a guaranteed startup voltage of 0.9V at +25°C (1.1V max), enabling operation from deeply discharged single-cell batteries. Once running, it sustains regulation down to 0.7V input due to bootstrap operation - a key differentiator from most boost converters requiring ≥1.8V startup. This behavior is confirmed in the Electrical Characteristics table under "Minimum Startup Voltage".
Can MAX1709EUI+T be synchronized to an external clock, and what is the supported frequency range?
Yes, the MAX1709EUI+T supports external clock synchronization via the CLK pin across 350kHz to 1000kHz. When an external clock signal is applied, the device locks within two cycles and maintains tight phase alignment - critical for noise-sensitive applications like RF front-ends. Internal oscillator resumes automatically within ~40µs if the external clock stops, as documented in the Detailed Description section.
How does the SS/LIM pin function in MAX1709EUI+T, and what design flexibility does it provide?
The SS/LIM pin on MAX1709EUI+T serves dual purposes: connecting a capacitor to GND sets soft-start ramp time (C3 = 3.2 × tSS µF), while adding a resistor to GND scales the current limit from 7.5A down to 3.5A. This allows designers to independently optimize inrush protection and inductor sizing - for example, reducing current limit to 4A for a 2A continuous load improves efficiency by 2–3% and permits smaller magnetics.
What is the thermal performance advantage of the TSSOP-EP package used by MAX1709EUI+T?
The MAX1709EUI+T's TSSOP-EP package features an exposed thermal pad with 1.2°C/W junction-to-pad thermal resistance - over 28× better than the narrow SO variant's ~34°C/W. This enables 1.9W continuous power dissipation at +70°C ambient, supporting 4A output without forced air cooling. Board layout must connect the pad to ≥1 in² of 1oz copper with multiple thermal vias for full benefit.
Does MAX1709EUI+T support momentary pushbutton on/off control, and how is it implemented?
Yes, MAX1709EUI+T implements true push-on/push-off using ONA and ONB inputs with built-in hysteresis. As shown in Figure 5, grounding ONA and toggling ONB through a momentary switch enables single-button control: press to turn on, hold to allow host MCU to assert ONA high, then release; second press pulls ONA low and releases ONB to shut down. This eliminates need for external logic or microcontroller GPIO dedicated solely to power sequencing.
MAX1709EUI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1709EUI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1709EUI+T 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+T reliable?
The price and inventory of MAX1709EUI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1709EUI+T is usually 5 days.
3.What payment methods are accepted for MAX1709EUI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1709EUI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1709EUI+T?
MAX1709EUI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1709EUI+T 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+T?
For technical support, including MAX1709EUI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1709EUI+T requirements.
6.How does Aetrix verify that MAX1709EUI+T is sourced from the original manufacturer or authorized distributors?
All MAX1709EUI+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX1709EUI+T?
All MAX1709EUI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1709EUI+T, 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+T part is unused and in its original packaging.
Return procedure for MAX1709EUI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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