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Analog Devices Inc./Maxim Integrated MAX1722ELT+
- Part No.:
- MAX1722ELT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX1722ELT+.pdf
- Description:
- IC REG BOOST ADJ 400MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,443
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Product details
Overview
MAX1722ELT+ from Maxim Integrated is an adjustable-output, high-efficiency step-up DC-DC converter optimized for single-cell alkaline/NiMH or Li+ battery operation. It delivers up to 150mA output current with ±1% output voltage accuracy, 1.5μA quiescent supply current, and guaranteed startup at 0.91V input - ideal for ultra-low-power portable medical devices and remote wireless transmitters.
For engineers reviewing the MAX1722ELT+ datasheet, MAX1722ELT+ pinout, MAX1722ELT+ application, or MAX1722ELT+ equivalent, key selection criteria include its 0.8V–5.5V input range, 2V–5.5V adjustable output, internal synchronous rectification eliminating external diodes, TSOT/µDFN package compatibility, and EMI-suppressing damping switch functionality.
Technical Context
The MAX1722ELT+ employs a forced discontinuous, current-limited pulse-frequency-modulation (PFM) control scheme with no oscillator - switching frequency varies dynamically with load to maintain ultra-low quiescent current. Its N-channel power switch features 0.5Ω on-resistance, and the integrated P-channel synchronous rectifier eliminates external Schottky diode requirements.
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 inductor ringing at the LX node to reduce EMI without compromising efficiency. The device operates across –40°C to +85°C and supports output adjustment via external resistor divider on the FB pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 5.5V - supports single-cell alkaline (0.8V cutoff), NiMH, or Li+ batteries without external LDO pre-regulation. |
| Output Voltage Range | 2.0V to 5.5V (adjustable via FB pin) - enables flexible rail generation for sensors, RF ICs, or microcontrollers requiring non-standard voltages. |
| Quiescent Supply Current | 1.5μA - minimizes battery drain during standby, extending shelf life and operational runtime in intermittent-use applications. |
| Startup Input Voltage | 0.91V (typ) at +25°C - ensures reliable power-up even as primary cells deplete below 1.0V under light load. |
| Output Accuracy | ±1% - maintains tight regulation for precision analog circuits or ADC references without trimming. |
| Max Output Current | 150mA at VOUT = 3.3V, VIN = 1.5V - sufficient to drive BLE radios, OLED displays, or low-power microcontrollers directly. |
| Efficiency | Up to 90% - achieved via synchronous rectification and optimized PFM control, reducing thermal stress and PCB area vs. diode-based boosters. |
Pinout & Package
MAX1722ELT+ is housed in a 6-pin µDFN package (2mm × 2mm × 0.75mm), RoHS-compliant and lead(Pb)-free, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback input | Connects to resistor divider to set output voltage; 1.235V reference enables precise 2V–5.5V adjustment with ≤20nA bias current. |
| 2 - BATT | Battery input & damping switch connection | Primary input path for battery source; powers startup circuit and enables internal damping switch for EMI suppression at LX node. |
| 3 - GND | Ground reference | System ground return for all internal circuitry; must be tied to low-impedance ground plane within 5mm of input/output capacitors. |
| 4 - OUT | Power output & bootstrap supply | Delivers regulated output; also supplies bootstrap voltage to internal gate drivers - requires low-ESR ceramic capacitor (≥10μF) directly at pin. |
| 5 - N.C. | No connect | Unbonded pin; must remain floating - no routing or soldering permitted to avoid parasitic coupling or reliability risk. |
| 6 - LX | Switch node | Drain of internal N-channel MOSFET and P-channel synchronous rectifier; connects to inductor; critical for EMI control and layout-sensitive node. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diode - reduces BOM count, board space, and conduction losses by replacing ~0.3V diode drop with <0.2V MOSFET RDS(ON) loss. |
| Internal damping switch | Actively suppresses LX node ringing caused by LC resonance - lowers radiated EMI without increasing output ripple or sacrificing efficiency. |
| Ultra-low quiescent current | 1.5μA into OUT pin - enables >1-year battery life in wake-on-event sensor nodes powered by CR2032 coin cells. |
| Guaranteed low-voltage startup | 0.91V minimum input at +25°C - ensures reliable power-up from partially discharged alkaline cells before system brownout. |
| Adjustable output architecture | FB pin accepts resistor divider - allows field-programmable output voltage without changing bill-of-materials or PCB layout. |
Applications
| Remote Wireless Transmitter | Personal Medical Device |
|---|---|
Use Scenario: Battery-powered sub-GHz ISM band transmitter sending periodic vital-sign telemetry from wearable patch sensor. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V rail for RF transceiver and MCU from single 1.5V alkaline cell. Use Value: 1.5μA quiescent current extends 10-year shelf life; 0.91V startup ensures operation until battery reaches 0.85V; EMI suppression avoids interference with sensitive analog front-end. |
Use Scenario: Handheld glucose meter using disposable AAA alkaline battery with LCD display and electrochemical sensor interface. IC Role / Device Role / Timing Role: Supplies regulated 3.0V for precision ADC reference and 5.0V for LCD bias from single 1.5V cell. Use Value: ±1% output accuracy guarantees measurement repeatability; synchronous rectification enables compact 2-layer PCB; TSOT/µDFN footprint fits handheld form factor. |
| Digital Still Camera | Low-Power Hand-Held Instrument |
Use Scenario: Compact point-and-shoot camera with flash LED and image sensor requiring dual rails (3.3V logic, 5.0V sensor bias). IC Role / Device Role / Timing Role: Adjustable boost converter configured for 5.0V output to drive white LED flash and sensor analog block. Use Value: Up to 90% efficiency minimizes heat near optical components; 150mA output supports brief high-current flash pulses without voltage sag. |
Use Scenario: Portable multimeter or environmental sensor logger operating from two AA cells with Bluetooth LE connectivity. IC Role / Device Role / Timing Role: Generates 3.3V system rail and 2.5V reference for 16-bit sigma-delta ADC from 1.2–3.0V input range. Use Value: 0.8V–5.5V input range accommodates full battery discharge curve; internal damping switch meets Class B EMC requirements without shielding. |
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 |
|---|---|---|---|
| MAX1724ELT33+ | Fixed 3.3V output; includes SHDN pin and damping switch; same µDFN package. | Eliminates external feedback resistors but lacks output flexibility - suitable only where 3.3V is mandatory. | Select when board space is constrained and fixed 3.3V simplifies design; verify shutdown timing matches host controller requirements. |
| Texas Instruments TPS61200DRCR | 0.3V–5.5V input; 1.8V–5.5V adjustable output; 1.2μA quiescent current; 6-pin WSON package. | Lower IQ and wider input range, but no integrated damping switch - may require external EMI filtering in noise-sensitive designs. | Prefer for longest battery life in deep-sleep IoT nodes; confirm LX node layout meets TI's stricter loop-area recommendations for EMI control. |
Compared with MAX1722ELT+, MAX1724ELT33+ trades adjustability for reduced component count and guaranteed 3.3V accuracy, while TPS61200DRCR offers lower quiescent current but requires external EMI mitigation - making MAX1722ELT+ optimal for cost-sensitive, EMI-constrained designs needing flexible output voltage.
Availability
MAX1722ELT+ is available at Aetrix Electronics and suitable for remote wireless transmitters, personal medical devices, and low-power hand-held instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX1722ELT+ 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 communications applications.
The MAX1722/MAX1723/MAX1724 family was engineered specifically for ultra-low-power, space-constrained battery-operated systems - prioritizing sub-2μA quiescent current, sub-1V startup, and integrated EMI reduction without external components.
FAQ
What is the minimum input voltage required for MAX1722ELT+ to start up?
The MAX1722ELT+ guarantees startup at 0.91V input voltage at +25°C with no load, and operates continuously down to 0.8V. This capability is enabled by a dedicated low-voltage startup circuit powered from the BATT pin, allowing reliable operation from deeply discharged alkaline or NiMH cells. Startup voltage increases slightly under load and at temperature extremes - see Figure toc05 and toc07 in the datasheet for full characterization.
Does MAX1722ELT+ include a shutdown function?
No, the MAX1722ELT+ does not include a shutdown pin - it is the non-SHDN variant in the MAX1722/MAX1723/MAX1724 family. The MAX1723ELT+ and MAX1724ELT+ variants provide active-low SHDN functionality with 0.1μA shutdown current. For MAX1722ELT+, system-level power control must be implemented externally, such as via a load switch upstream of the BATT pin.
How is the output voltage set on MAX1722ELT+?
The MAX1722ELT+ output voltage is set using an external resistor divider connected between OUT, FB, and GND. With a 1.235V internal reference at the FB pin, the output is calculated as VOUT = 1.235V × (1 + R1/R2). Feedback resistor values should be selected between 100kΩ and 1MΩ to minimize error from FB leakage current (≤20nA). Example: R1 = 1.24MΩ and R2 = 2.37MΩ yields 3.3V output.
What package type is used for MAX1722ELT+?
MAX1722ELT+ uses a 6-pin µDFN package (2mm × 2mm × 0.75mm) with exposed thermal pad, designated as package code L622+1 per Maxim's ordering guide. It is RoHS-compliant and lead(Pb)-free, with land pattern number 90-0004. This differs from the 5-pin TSOT version (e.g., MAX1722EZK+) and provides improved thermal performance for higher ambient temperature operation.
Does MAX1722ELT+ integrate EMI suppression features?
Yes, MAX1722ELT+ integrates an internal damping switch connected to the BATT pin that actively suppresses inductor ringing at the LX node - a primary source of radiated EMI in boost converters. This feature is confirmed in the "BATT/Damping Switch (MAX1722/MAX1724)" section and Figures 4–6 of the datasheet. It reduces EMI without increasing output ripple or requiring external snubbers or ferrite beads.
MAX1722ELT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 400mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX1722ELT+ FAQ
1.How can I place an order for MAX1722ELT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1722ELT+ 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 MAX1722ELT+ reliable?
The price and inventory of MAX1722ELT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1722ELT+ is usually 5 days.
3.What payment methods are accepted for MAX1722ELT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1722ELT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1722ELT+?
MAX1722ELT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1722ELT+ 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 MAX1722ELT+?
For technical support, including MAX1722ELT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1722ELT+ requirements.
6.How does Aetrix verify that MAX1722ELT+ is sourced from the original manufacturer or authorized distributors?
All MAX1722ELT+ 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 MAX1722ELT+ meets industry standards.
7.What is the process for return or replacement of MAX1722ELT+?
All MAX1722ELT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1722ELT+, 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 MAX1722ELT+ part is unused and in its original packaging.
Return procedure for MAX1722ELT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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