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Analog Devices Inc./Maxim Integrated MAX1724ELT33+
- Part No.:
- MAX1724ELT33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX1724ELT33+.pdf
- Description:
- IC REG BOOST 3.3V 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,522
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Product details
Overview
MAX1724ELT33+ 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, 0.1μA shutdown current, ±1% output voltage accuracy over temperature, and internal EMI suppression. It operates from 0.8V to 5.5V input and delivers up to 150mA output current, optimized for single-cell alkaline/NiMH or Li+ battery-powered portable devices.
For engineers reviewing the MAX1724ELT33+ datasheet, MAX1724ELT33+ pinout, MAX1724ELT33+ application, or MAX1724ELT33+ equivalent, key selection considerations include guaranteed 0.91V startup voltage, integrated damping switch for LX ringing reduction, TSOT/µDFN package compatibility, fixed 3.3V output with no external feedback resistors required, and absence of external diode or FETs.
Technical Context
The MAX1724ELT33+ employs a forced discontinuous, current-limited pulse-frequency-modulation (PFM) control scheme with no oscillator-switching frequency varies dynamically with load. Its internal N-channel power switch (RDS(ON) = 0.5Ω typ) and P-channel synchronous rectifier eliminate external diode losses, while the dedicated BATT pin powers the low-voltage startup circuit to ensure reliable operation down to 0.91V.
A built-in damping switch connected to the BATT pin suppresses inductor ringing at the LX node, reducing EMI without degrading efficiency or increasing board area. The device integrates a precision 1.235V reference and error comparator for tight output regulation, and its SHDN pin accepts logic-level inputs up to 6V independent of supply rails.
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 microcontrollers or sensors. |
| Input Voltage Range | 0.8V to 5.5V - supports single-cell Li+, alkaline, or NiMH batteries across full discharge curve without external LDO pre-regulation. |
| Quiescent Current | 1.5μA into OUT - enables >1-year battery life in always-on IoT sensors drawing <10μA average system current. |
| Shutdown Current | 0.01μA at +25°C - reduces standby drain to negligible levels in remote controls or medical wearables during sleep mode. |
| Startup Voltage | 0.91V at +25°C (guaranteed) - allows operation from deeply discharged 1.2V alkaline cells or aging NiMH packs before cutoff. |
| Max Output Current | 150mA at VIN = 1.5V, VOUT = 3.3V - sufficient to power BLE radios, small displays, or ADCs in compact handheld instruments. |
| Package | 6-pin µDFN (2mm × 2mm × 0.75mm) - enables ultra-compact PCB layouts where TSOT height (0.9mm) is unacceptable. |
Pinout & Package
MAX1724ELT33+ uses a 6-pin µDFN package (2mm × 2mm × 0.75mm, land pattern 90-0004), RoHS-compliant, with wettable flanks for automated optical inspection. Pin 1 marked by dot; exposed thermal pad (EP) soldered to PCB ground for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Battery input and damping switch connection | Primary power path; supplies startup circuit and activates internal damping switch to suppress LX ringing during light-load PFM operation. |
| SHDN | Active-low shutdown control input | Drives low (≤75mV) to enter 0.01μA shutdown; tolerates up to 6V regardless of VBATT/VOUT, enabling direct MCU GPIO control. |
| GND | Analog and power ground reference | Common return for all internal circuits; must be tied directly to low-impedance PCB ground plane within 5mm of CIN/COUT grounds. |
| FB | Feedback input (not used on MAX1724) | No connection required - internally tied to reference; pin left floating per datasheet; not functional in fixed-output variant. |
| OUT | Regulated power output and bootstrap supply | Delivers 3.3V to load; also powers internal gate drivers - requires low-ESR ceramic capacitor (≥10μF) placed adjacent to pin. |
| LX | Switch node (N-MOSFET drain / P-MOSFET drain) | Connects to inductor; high dv/dt node requiring shortest possible trace to minimize EMI; damping switch active only when BATT is present. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET replaces external Schottky diode - reduces BOM count, saves 0.5mm² board area, and improves light-load efficiency by 8–12%. |
| Internal EMI suppression | Damping switch activated via BATT pin - cuts LX ringing amplitude by >50% vs. MAX1723, easing EMC compliance in wireless transmitters without added ferrites. |
| Ultra-low quiescent current | 1.5μA supply current into OUT - extends shelf life of battery-powered pagers and remote controls beyond 5 years with CR2032 cells. |
| Guaranteed low-voltage startup | 0.91V minimum start-up voltage - enables use with single NiMH cells down to 0.95V under load, avoiding premature system shutdown. |
| Fixed-output architecture | 3.3V output trimmed at wafer test - eliminates resistor tolerance errors and layout sensitivity of adjustable variants, improving production yield. |
Applications
| Remote Wireless Transmitters | Pagers |
|---|---|
|
Use Scenario: Compact UHF ISM-band transmitter modules powered by single AA alkaline cells, transmitting sensor data every 5 minutes. IC Role / Device Role: Primary 3.3V power rail generator stepping up from 1.0–1.5V battery voltage to stable 3.3V for RF IC and microcontroller. Use Value: 0.91V startup ensures operation until battery reaches 0.95V; 1.5μA quiescent current minimizes self-discharge during 4.95-minute sleep intervals. |
Use Scenario: Legacy two-way pagers with monochrome LCD and vibration motor, operating from one AAA NiMH cell. IC Role / Device Role: High-efficiency boost converter supplying regulated 3.3V to baseband processor and display driver ICs. Use Value: Internal damping switch reduces conducted EMI into pager's sensitive receiver front-end; µDFN footprint fits narrow PCB width constraints. |
| Personal Medical Devices | Low-Power Hand-Held Instruments |
|
Use Scenario: FDA-cleared glucose meter using disposable CR2032 coin cell, requiring 3.3V for analog front-end and Bluetooth LE radio. IC Role / Device Role: Single-chip power solution delivering precise 3.3V with ±1% accuracy across -20°C to +50°C operating range. Use Value: 0.1μA shutdown current preserves battery capacity during 30-day shelf life; fixed output avoids calibration drift from external resistor aging. |
Use Scenario: Portable multimeter with auto-ranging ADC, OLED display, and USB-C charging, powered by single 18650 Li+ cell. IC Role / Device Role: Secondary boost stage generating clean 3.3V from partially discharged Li+ cell (3.0–4.2V) to power digital subsystem. Use Value: Synchronous rectification maintains >85% efficiency at 50mA load even at 3.0V input, extending runtime between charges. |
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 |
|---|---|---|---|
| MAX1724ELT30+ | Fixed 3.0V output; identical quiescent current, shutdown, package, and EMI features. | Used where 3.0V logic interface or lower power consumption at same load is required. | Select when system ICs tolerate 3.0V supply or require margin below 3.3V absolute maximum ratings. |
| TPS61200DRCR | Adjustable output (1.2–5.5V); higher 2.5μA quiescent current; no integrated damping switch; same 6-pin SON package. | Preferred for designs needing programmable output or tighter ripple specs via external compensation. | Choose if output voltage flexibility outweighs 1.0μA quiescent current penalty and EMI mitigation requirements. |
Compared with MAX1724ELT33+, the MAX1724ELT30+ offers identical form-factor and efficiency but targets 3.0V systems, while the TPS61200DRCR trades ultra-low IQ and EMI suppression for output adjustability-making it suitable only when fixed 3.3V regulation is not mandatory.
Availability
MAX1724ELT33+ is available at Aetrix Electronics and suitable for remote wireless transmitters, personal medical devices, and low-power hand-held instruments requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX1724ELT33+ 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, medical, and consumer applications.
The MAX1722/MAX1723/MAX1724 family was engineered specifically for ultra-low-power, space-constrained battery-powered devices-prioritizing sub-2μA quiescent current, sub-1V startup, and integrated EMI control without external components.
FAQ
What is the guaranteed minimum startup voltage for MAX1724ELT33+?
The MAX1724ELT33+ guarantees startup at 0.91V (typical 0.83V) at +25°C with no load, enabled by its dedicated BATT pin powering the internal startup circuit. This specification is validated across production lots and holds over the full -40°C to +85°C operating temperature range per datasheet Table 1.
Does MAX1724ELT33+ require external feedback resistors to set the output voltage?
No. The MAX1724ELT33+ is a fixed-output variant with 3.3V trimmed at wafer test; the FB pin is unused and must remain unconnected. Unlike the adjustable MAX1722/MAX1723, this eliminates resistor tolerance errors, layout sensitivity, and BOM cost-ensuring ±1% output accuracy without external components.
How does the internal damping switch in MAX1724ELT33+ reduce EMI?
The MAX1724ELT33+ damping switch connects between BATT and LX during inductor flyback, providing a low-impedance path to dissipate resonant energy that would otherwise cause high-frequency ringing. This cuts peak LX dv/dt by >50%, directly lowering radiated emissions without affecting output ripple or efficiency.
What is the maximum continuous output current capability of MAX1724ELT33+?
The MAX1724ELT33+ delivers up to 150mA continuous output current when stepping up from 1.5V input to 3.3V output, as verified in Figure toc04 of the datasheet. At lower input voltages (e.g., 1.0V), maximum output current decreases to ~80mA due to duty-cycle limitations and internal switch RDS(ON).
Can MAX1724ELT33+ be used with a single-cell Li+ battery?
Yes. The MAX1724ELT33+ supports input voltages from 0.8V to 5.5V, fully covering the 2.5V–4.2V discharge curve of a single Li+ cell. Its 1.5μA quiescent current and 0.1μA shutdown current maximize usable capacity, while the 3.3V fixed output matches standard logic and RF IC requirements.
MAX1724ELT33+ 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+ FAQ
1.How can I place an order for MAX1724ELT33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1724ELT33+ 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+ reliable?
The price and inventory of MAX1724ELT33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1724ELT33+ is usually 5 days.
3.What payment methods are accepted for MAX1724ELT33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1724ELT33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1724ELT33+?
MAX1724ELT33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1724ELT33+ 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+?
For technical support, including MAX1724ELT33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1724ELT33+ requirements.
6.How does Aetrix verify that MAX1724ELT33+ is sourced from the original manufacturer or authorized distributors?
All MAX1724ELT33+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1724ELT33+?
All MAX1724ELT33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1724ELT33+, 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+ part is unused and in its original packaging.
Return procedure for MAX1724ELT33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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