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Analog Devices Inc./Maxim Integrated MAX1724ELT33+T
- Part No.:
- MAX1724ELT33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX1724ELT33+T.pdf
- Description:
- IC REG BOOST 3.3V 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,528
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Product details
Overview
MAX1724ELT33+T from Maxim Integrated is a fixed-output 3.3V, synchronous step-up DC-DC converter in a 6-pin µDFN package (2mm × 2mm × 0.75mm), featuring 1.5μA quiescent current, ±1% output voltage accuracy over temperature, 0.91V guaranteed startup, and integrated EMI suppression. It delivers up to 150mA output current from input voltages as low as 0.8V and is optimized for single-cell alkaline/NiMH or Li+ battery-powered portable electronics.
For engineers reviewing the MAX1724ELT33+T datasheet, MAX1724ELT33+T pinout, MAX1724ELT33+T application, or MAX1724ELT33+T equivalent, key selection criteria include ultra-low IQ for battery life extension, fixed 3.3V output without external feedback resistors, shutdown current of 0.001µA at +25°C, TSOT/µDFN footprint compatibility, and internal damping switch for EMI control in space-constrained designs.
Technical Context
The MAX1724ELT33+T employs a forced discontinuous, current-limited PFM control scheme with no oscillator-switching frequency varies dynamically with load. Its N-channel power switch exhibits 0.5Ω typical on-resistance, and the integrated synchronous rectifier uses a P-channel MOSFET to eliminate external diode losses.
A dedicated low-voltage startup circuit powered from the BATT pin enables reliable operation down to 0.91V input, while an internal damping switch suppresses LX node ringing to reduce radiated EMI without degrading efficiency or output ripple performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +85°C - eliminates need for external feedback divider and ensures stable rail for 3.3V logic/systems. |
| Quiescent Current | 1.5μA into OUT - enables multi-year battery life in always-on, low-duty-cycle applications like remote sensors. |
| Shutdown Current | 0.001μA into BATT at +25°C - reduces standby drain to negligible levels during system sleep modes. |
| Input Voltage Range | 0.8V to 5.5V - supports operation from one depleted alkaline cell (0.8V) through fully charged Li+ (4.2V) or boosted sources. |
| Startup Voltage | 0.91V minimum at +25°C - guarantees reliable turn-on even with heavily discharged primary cells. |
| Output Current | Up to 150mA at VOUT = 3.3V - sufficient to power microcontrollers, RF transceivers, and small displays from single-cell sources. |
| Package | 6-pin µDFN (2mm × 2mm × 0.75mm) - ultra-compact footprint ideal for wearables and hearing aids where board area is critical. |
Pinout & Package
MAX1724ELT33+T is housed in a lead(Pb)-free, RoHS-compliant 6-pin µDFN package (outline 21-0164, land pattern 90-0004), measuring 2.0mm × 2.0mm × 0.75mm with exposed thermal pad. The package supports reflow soldering at +260°C (lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Battery input and damping switch connection | Primary power input; also powers low-voltage startup circuit-enables 0.91V start and provides path for damping energy dissipation. |
| SHDN | Active-low shutdown control | Drives IC into ultra-low-power state (<0.001μA BATT current); logic-compatible with 0.075–0.4V low threshold and 0.5–0.8V high threshold. |
| GND | Analog and power ground reference | Common return for all internal circuits; must be connected to low-impedance ground plane within 5mm of input/output capacitors. |
| FB | Feedback input | Not connected (NC) on MAX1724ELT33+T-output is internally trimmed to 3.3V; pin is reserved but unused in fixed-output variants. |
| OUT | Regulated power output and bootstrap supply | Delivers 3.3V to load; also supplies internal gate drive-requires low-ESR ceramic capacitor (≥10μF) placed adjacent to pin. |
| LX | Switch node (N-channel drain / P-channel drain) | Connects to external inductor; internal damping switch clamps ringing here to reduce EMI-critical for FCC/CE compliance in portable devices. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET replaces external Schottky diode-reduces component count, board area, and conduction losses by >30% vs. diode-based solutions. |
| Internal damping switch | Actively suppresses inductor ringing at LX node-lowers radiated EMI without requiring ferrite beads or snubbers, simplifying EMC design. |
| Ultra-low quiescent current | 1.5μA supply current into OUT-preserves battery capacity in intermittently active systems such as IR remotes and medical telemetry. |
| Guaranteed low-voltage startup | 0.91V minimum input at +25°C-ensures reliable operation across full battery discharge curve of alkaline/NiMH cells. |
| Fixed 3.3V output accuracy | ±1% over -40°C to +85°C-meets tight tolerance requirements for MCU I/O, ADC references, and digital interface rails without calibration. |
Applications
| Remote Wireless Transmitters | Pagers |
|---|---|
Use Scenario: Battery-powered 433MHz ISM-band transmitters sending periodic sensor data from industrial sites. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V rail for RF IC and microcontroller from single AA alkaline cell. Use Value: 0.91V startup and 1.5μA IQ extend usable battery life beyond 2 years; EMI suppression avoids interference with transmitted signal integrity. |
Use Scenario: Legacy alphanumeric pagers operating on button-cell batteries with strict size constraints. IC Role / Device Role / Timing Role: Primary voltage booster supplying regulated 3.3V to display driver and baseband processor from 1.5V silver-oxide cell. Use Value: 2mm × 2mm µDFN footprint fits narrow pager PCBs; fixed 3.3V output eliminates resistor placement error and improves yield. |
| Digital Still Cameras | Personal Medical Devices |
Use Scenario: Compact point-and-shoot cameras using single Li+ cell to power image sensor, flash LED driver, and SD card interface. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 150mA at 3.3V for memory and logic subsystems during burst capture. Use Value: Up to 90% efficiency at 50mA load minimizes thermal rise in sealed plastic housing; shutdown current <0.001μA preserves standby time between shots. |
Use Scenario: Portable glucose meters powered by coin-cell batteries requiring long shelf life and consistent measurement accuracy. IC Role / Device Role / Timing Role: Precision 3.3V supply for analog front-end, LCD controller, and BLE radio-stable across battery voltage decay. Use Value: ±1% output accuracy ensures ADC reference stability; 0.8V–5.5V input range accommodates full CR2032 discharge profile (3.0V → 2.0V). |
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 |
|---|---|---|---|
| TPS61200DRCT | Adjustable output (0.9V–5.5V), 1.2μA IQ, 3.3V achievable via external resistors; no integrated damping switch. | Requires feedback network layout and external EMI mitigation; better for multi-rail or programmable systems. | Select when adjustable output or lower IQ is prioritized over fixed-voltage simplicity and built-in EMI control. |
| SP6641A-3.3 | Fixed 3.3V output, 2.5μA IQ, 0.95V startup, SOT-23-5 package; lacks synchronous rectification and damping. | Needs external Schottky diode; higher conduction loss and larger solution size; less suitable for EMI-sensitive environments. | Select for cost-sensitive, non-EMI-critical applications where µDFN footprint is not required and 1.5μA IQ is not mandatory. |
Compared with TPS61200DRCT and SP6641A-3.3, the MAX1724ELT33+T uniquely combines fixed 3.3V precision, lowest IQ among alternatives, integrated damping for EMI reduction, and smallest package-making it optimal for miniaturized, battery-life-critical, and regulatory-compliant portable designs.
Availability
MAX1724ELT33+T is available at Aetrix Electronics and suitable for remote wireless transmitters, personal medical devices, and digital still cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1724ELT33+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and consumer applications.
The MAX1722/MAX1723/MAX1724 family was designed specifically for ultra-low-power, single-cell battery-powered portable electronics-emphasizing minimal quiescent current, compact packaging, and robust low-voltage operation without external components.
FAQ
What is the guaranteed startup voltage for MAX1724ELT33+T at room temperature?
The MAX1724ELT33+T guarantees startup at 0.91V input voltage at +25°C, enabled by its dedicated BATT-powered startup circuit. This allows reliable operation even with deeply discharged alkaline or NiMH cells. Startup voltage rises slightly with temperature-e.g., ~0.95V at +85°C-but remains well below 1.0V across the full -40°C to +85°C operating range. The MAX1724ELT33+T maintains regulation down to 0.8V input once started.
Does MAX1724ELT33+T require external feedback resistors to set the output voltage?
No, the MAX1724ELT33+T does not require external feedback resistors. It is a fixed-output variant with the 3.3V regulation point trimmed internally during manufacturing. Pin 4 (FB) is a no-connect (NC) on this part-no external components are needed for voltage setting. This eliminates resistor tolerance errors, saves PCB area, and improves production yield compared to adjustable boost converters like the MAX1722/MAX1723.
How does the internal damping switch in MAX1724ELT33+T reduce EMI?
The internal damping switch in the MAX1724ELT33+T provides a controlled discharge path for resonant energy at the LX node after each switching cycle, suppressing high-frequency ringing caused by inductor-capacitor interaction. This reduces radiated EMI without increasing output ripple or lowering efficiency. Unlike external RC snubbers, it requires no additional components or board space-making the MAX1724ELT33+T especially valuable for FCC/CE-certified portable products where EMI margins are tight.
What is the maximum continuous output current capability of MAX1724ELT33+T?
The MAX1724ELT33+T delivers up to 150mA of continuous output current at 3.3V under typical conditions (VIN ≥ 1.5V, TA = +25°C, 10μH inductor, 10μF ceramic output capacitor). Output current decreases at lower input voltages-for example, ~100mA at VIN = 1.0V-and is limited by peak inductor current, efficiency, and thermal dissipation. The device's 0.5Ω N-channel switch and synchronous rectifier enable this performance in the thermally constrained 2mm × 2mm µDFN package.
Is MAX1724ELT33+T pin-compatible with other members of the MAX1722/MAX1723/MAX1724 family in the same package?
Yes, the MAX1724ELT33+T shares identical pinout and µDFN package dimensions (2mm × 2mm × 0.75mm) with other ELT-suffix variants like MAX1722ELT+T and MAX1723ELT+T. However, functional differences exist: MAX1722ELT+T has adjustable output (FB used), MAX1723ELT+T adds shutdown but omits damping, and MAX1724ELT33+T integrates both shutdown and damping with fixed 3.3V output. PCB layout is interchangeable, but schematic connections must match the specific variant's functionality.
MAX1724ELT33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.91V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX1724ELT33+T FAQ
1.How can I place an order for MAX1724ELT33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1724ELT33+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 MAX1724ELT33+T reliable?
The price and inventory of MAX1724ELT33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1724ELT33+T is usually 5 days.
3.What payment methods are accepted for MAX1724ELT33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1724ELT33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1724ELT33+T?
MAX1724ELT33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1724ELT33+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 MAX1724ELT33+T?
For technical support, including MAX1724ELT33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1724ELT33+T requirements.
6.How does Aetrix verify that MAX1724ELT33+T is sourced from the original manufacturer or authorized distributors?
All MAX1724ELT33+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 MAX1724ELT33+T meets industry standards.
7.What is the process for return or replacement of MAX1724ELT33+T?
All MAX1724ELT33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1724ELT33+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 MAX1724ELT33+T part is unused and in its original packaging.
Return procedure for MAX1724ELT33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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