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Analog Devices Inc./Maxim Integrated MAX1708EEE+T
- Part No.:
- MAX1708EEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1708EEE+T.pdf
- Description:
- IC REG BOOST ADJ 4.5A 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
The MAX1708EEE+T from Maxim Integrated is a high-frequency, high-power, low-noise step-up DC-DC converter with an integrated 5A RMS N-channel power MOSFET. It delivers up to 2A output at fixed 3.3V or 5V, or adjustable 2.5V–5.5V, from input voltages as low as 0.7V, and operates at a fixed 600kHz switching frequency for predictable noise filtering-ideal for battery-powered RF power amplifiers and local voltage conversion in routers and workstations.
For engineers reviewing the MAX1708EEE+T datasheet, MAX1708EEE+T pinout, MAX1708EEE+T application, or MAX1708EEE+T equivalent, key selection considerations include its programmable soft-start and current limit via SS/LIM pin, dual-mode output configuration (fixed or adjustable), external clock synchronization (350kHz–1MHz), ultra-low 1µA shutdown current, and QSOP-16 package thermal layout requirements.
Technical Context
The MAX1708EEE+T employs constant-frequency current-mode PWM control with internal 600kHz oscillator or external clock synchronization. Its Dual Mode™ architecture enables either fixed-output operation (3.3V/5V selected by 3.3/5 pin) or adjustable output (2.5V–5.5V) via FB resistor divider, with precise 1.24V reference voltage and ±0.6% load regulation.
It integrates a 5A RMS-rated N-channel switch with 30–80mΩ on-resistance, supports push-button on/off control via ONA/ONB logic with 0.15V hysteresis, and features undervoltage lockout (2.0–2.3V), programmable soft-start timing (tSS = 4ms + 110 × CSS), and adjustable current limit (1.8–4.0A) using an external resistor to SS/LIM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V to 5.0V - enables single- to 3-cell battery operation and compatibility with 2.5V/3.3V supply rails. |
| Output Voltage Options | Fixed 3.3V or 5.0V (via 3.3/5 pin), or adjustable 2.5V–5.5V (via FB divider) - supports multiple system rail requirements without redesign. |
| Switching Frequency | 600kHz internal (±80kHz), synchronizable 350kHz–1000kHz - ensures consistent EMI profile and enables noise-sensitive IF band avoidance. |
| Max Output Current | Up to 2A at VOUT = 5V from VIN = 3.3V - delivers 10W power with high efficiency in compact footprint. |
| Quiescent & Shutdown Current | 1mW quiescent power; 1µA shutdown current - extends battery life in portable and always-on systems. |
| RMS Switch Current Rating | 5A RMS - defines safe continuous conduction capability under thermal limits and ripple stress. |
| Reference Voltage Accuracy | 1.240V ±25mV (typical) - sets precision for feedback loop stability and output voltage tolerance. |
Pinout & Package
MAX1708EEE+T is housed in a 16-pin QSOP package (3.9mm × 4.9mm, 1.0mm height) with exposed thermal pad not connected internally; PGND pins (12–14) and LX pins (3–5) require wide copper traces for thermal and current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ONB) | Shutdown control input | Logic-high disables device when ONA = low; used with ONA for momentary push-button sequencing. |
| 2 (ONA) | Enable control input | Logic-high enables device regardless of ONB; supports microcontroller-driven latched on/off control. |
| 3–5 (LX) | Power switch drain node | Three paralleled pins carry high di/dt switching current; must connect to Schottky diode anode with minimal trace inductance. |
| 6, 9 (GND) | Analog ground reference | Provides signal return for REF, FB, CLK, and 3.3/5; separate from PGND to minimize noise coupling. |
| 7 (SS/LIM) | Soft-start timing & current limit programming | Capacitor to GND sets soft-start ramp time; resistor to GND scales current limit from 5A down to 1.8A. |
| 8 (REF) | 1.24V precision reference output | Bypassed with 0.22μF capacitor; supplies bias for external feedback dividers and must be loaded ≤50μA. |
| 10 (OUT) | IC power supply input | Powered from regulated output; bypassed with 0.1μF ceramic + 2Ω series resistor to damp supply resonance. |
| 11 (FB) | Feedback input | Regulates to 1.24V; tied to GND for fixed output, or connected to resistor divider for adjustable output. |
| 12–14 (PGND) | Power ground / MOSFET source | Three paralleled pins return high-current switch return path; must star-ground to input/output capacitors. |
| 15 (3.3/5) | Output voltage selection | Low = 3.3V, high = 5.0V when FB = GND; must be grounded if using external FB divider. |
| 16 (CLK) | Internal/external clock select | Connected to OUT for 600kHz internal operation; driven externally for synchronized switching (350kHz–1MHz). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A RMS power MOSFET | Eliminates external high-current switch, reduces BOM count, and simplifies layout for high-power boost applications. |
| Dual Mode™ output configuration | Enables rapid prototyping between fixed 3.3V/5V and adjustable 2.5V–5.5V outputs using same PCB footprint. |
| Programmable soft-start and current limit | Prevents inrush current and allows optimization of inductor size and efficiency across varying load conditions. |
| 600kHz fixed-frequency PWM with sync capability | Ensures repeatable EMI spectrum and enables co-location with other synchronized converters in dense systems. |
| Ultra-low 1µA shutdown current | Supports long-term battery standby in handheld communications devices without compromising wake-up responsiveness. |
Applications
| RF Power Amplifier Supply | Local 3.3V-to-5V Conversion |
|---|---|
Use Scenario: Providing clean, stable 5V supply to 3.6V or 5V RF PAs in cellular handsets and wireless modules. IC Role / Device Role / Timing Role: Step-up DC-DC converter generating regulated PA bias rail from single Li-ion cell or 3.3V system bus. Use Value: Delivers 2A peak current with <35mV output ripple (at 3.5A switch current) and 600kHz switching easily filtered outside IF bands. | Use Scenario: Generating 5V local supply from 3.3V backplane or motherboard rail in routers, servers, and card racks. IC Role / Device Role / Timing Role: High-efficiency boost regulator replacing discrete solutions for distributed 5V loads. Use Value: Achieves >88% efficiency at 1A load (VIN=3.3V, VOUT=5V) with minimal external components and small 2.2μH inductor. |
| Low-Voltage Battery Boost | Microcontroller System Rail Generation |
Use Scenario: Bootstrapping power from partially discharged 1-cell or 2-cell alkaline/NiMH batteries (down to 0.7V input). IC Role / Device Role / Timing Role: Primary power converter enabling operation below conventional LDO or buck-boost thresholds. Use Value: Starts reliably at 0.9V input (500mA load) and sustains regulation down to 0.7V once running-critical for extended battery runtime. | Use Scenario: Generating clean 3.3V or 5V supply for microcontrollers, sensors, and peripherals in portable industrial devices. IC Role / Device Role / Timing Role: System-level voltage translator with programmable soft-start to prevent brownout during MCU reset release. Use Value: Soft-start time configurable from 4ms upward via SS/LIM capacitor, ensuring controlled power-up sequence for digital subsystems. |
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 |
|---|---|---|---|
| MAX1709EEE+ | Higher 10A RMS switch rating; identical pinout, package, and feature set except current capability. | Suitable where peak load exceeds 2A or higher surge current margin is required (e.g., motor drivers, high-brightness LED arrays). | Select MAX1709EEE+ only if design requires >5A RMS switch current; otherwise MAX1708EEE+T offers optimal cost/performance balance. |
| TPS61088RHLR | 4.8A typical switch current; 2.7V–12V input; 2.5V–18.5V adjustable output; no dual-mode fixed-voltage option. | Better suited for wide-input industrial or automotive applications; lacks dedicated 3.3/5 pin and momentary push-button logic inputs. | Choose TPS61088RHLR when input exceeds 5V or output >5.5V needed; MAX1708EEE+T preferred for compact 3.3V/5V fixed-rail designs with low-VIN support. |
Compared with MAX1709EEE+, the MAX1708EEE+T provides identical functionality at lower current rating-reducing thermal stress and cost where 5A RMS is unnecessary. Against TPS61088RHLR, it offers simpler fixed-output selection and lower minimum input voltage (0.7V vs. 2.7V), but narrower output voltage range.
Availability
MAX1708EEE+T is available at Aetrix Electronics and suitable for RF power amplifier supplies, local 3.3V-to-5V conversion in networking equipment, and low-voltage battery boost applications requiring stable component supply and long-term production continuity.
Supply support for MAX1708EEE+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and consumer applications.
The MAX1708EEE+T belongs to Maxim's high-power boost converter product line, engineered specifically for space-constrained, noise-sensitive, battery-operated systems requiring efficient local voltage translation from sub-1V sources.
FAQ
What is the minimum input voltage required for startup of the MAX1708EEE+T?
The MAX1708EEE+T requires a minimum startup voltage of 0.9V to 1.1V (typical) at room temperature with light load (<1mA). Once operating, it sustains regulation down to 0.7V input due to bootstrap operation. Startup voltage increases with load and temperature-e.g., 1.5V at 85°C and 1A load per typical curves.
Can the MAX1708EEE+T generate both 3.3V and 5V outputs on the same board?
Yes-the MAX1708EEE+T supports dual fixed outputs via the 3.3/5 pin: pulling it low configures 3.3V output, pulling it high configures 5V output. Both configurations use internal feedback and require no external resistors. For boards needing both rails, two separate MAX1708EEE+T units can be deployed with independent 3.3/5 pin control.
How does the SS/LIM pin function in the MAX1708EEE+T?
The SS/LIM pin serves dual roles: connecting a capacitor to GND sets soft-start time (tSS = 4ms + 110 × CSS), while connecting a resistor to GND scales the current limit from 5A down to 1.8A. During shutdown, SS/LIM is internally pulled to GND to discharge the soft-start capacitor-ensuring reliable restart behavior.
Is the MAX1708EEE+T pin-compatible with the MAX1709EEE+?
Yes-the MAX1708EEE+T and MAX1709EEE+ share identical pinout, package (16-pin QSOP), and functional pin assignments. The sole difference is the internal power switch rating: 5A RMS for MAX1708EEE+T versus 10A RMS for MAX1709EEE+. No PCB changes are required when upgrading for higher current capability.
What layout practices are critical for stable operation of the MAX1708EEE+T?
Stable operation requires strict layout: (1) star-ground connection of PGND pins (12–14), input capacitor ground, and output capacitor ground; (2) wide, short traces for LX (pins 3–5) to Schottky diode and PGND; (3) 0.1μF ceramic + 2Ω series resistor on OUT pin; (4) FB trace shielded and kept extremely short; and (5) expanded PGND copper area or multiple vias to inner ground plane for thermal dissipation.
MAX1708EEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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:
- 4.5A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
MAX1708EEE+T FAQ
1.How can I place an order for MAX1708EEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1708EEE+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 MAX1708EEE+T reliable?
The price and inventory of MAX1708EEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1708EEE+T is usually 5 days.
3.What payment methods are accepted for MAX1708EEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1708EEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1708EEE+T?
MAX1708EEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1708EEE+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 MAX1708EEE+T?
For technical support, including MAX1708EEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1708EEE+T requirements.
6.How does Aetrix verify that MAX1708EEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1708EEE+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 MAX1708EEE+T meets industry standards.
7.What is the process for return or replacement of MAX1708EEE+T?
All MAX1708EEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1708EEE+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 MAX1708EEE+T part is unused and in its original packaging.
Return procedure for MAX1708EEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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