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Analog Devices Inc./Maxim Integrated MAX1722ELT+T
- Part No.:
- MAX1722ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX1722ELT+T.pdf
- Description:
- IC REG BOOST ADJ 400MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,846
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Product details
Overview
The MAX1722ELT+T from Maxim Integrated is an adjustable-output, synchronous step-up DC-DC converter in a 6-pin µDFN package, featuring 1.5μA quiescent current, 0.91V guaranteed startup, and ±1% output voltage accuracy over temperature. It operates from 0.8V to 5.5V input and delivers up to 150mA at adjustable outputs from 2V to 5.5V - ideal for single-cell alkaline/NiMH or Li+ battery-powered medical sensors and low-power instrumentation.
For engineers reviewing the MAX1722ELT+T datasheet, MAX1722ELT+T pinout, MAX1722ELT+T application, or MAX1722ELT+T equivalent, this page provides verified technical context, validated pin functions, confirmed EMI-suppressing damping switch behavior, real-world efficiency curves at light loads, and precise selection guidance between fixed vs. adjustable variants within the MAX1722/MAX1723/MAX1724 family.
Technical Context
The MAX1722ELT+T uses a forced discontinuous, current-limited 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 diodes, while a dedicated BATT-connected low-voltage startup circuit ensures reliable operation down to 0.91V input.
A built-in damping switch suppresses LX node ringing and reduces EMI without affecting output ripple or efficiency. Unlike the MAX1723/MAX1724, the MAX1722ELT+T lacks shutdown logic but includes the damping switch and supports adjustable output via FB pin with 1.235V reference and ≤20nA bias current.
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 pre-regulation. |
| Guaranteed Startup Voltage | 0.91V at +25°C - enables operation even as battery discharges below 1.0V under light load. |
| Quiescent Current | 1.5μA into OUT - preserves battery life in always-on sensor nodes with multi-year runtime. |
| Output Voltage Accuracy | ±1% over -40°C to +85°C - ensures stable MCU core or RF transceiver supply across industrial temperature range. |
| N-Channel Switch RDS(ON) | 0.5Ω typical - limits conduction loss during high-current pulses, supporting >100mA continuous output. |
| Feedback Reference Voltage | 1.235V ±0.012V - sets precision for external resistor-divider output adjustment from 2V to 5.5V. |
| Switch Current Limit | 400–600mA - protects internal FET during short-circuit or heavy transient loads without external sensing. |
Pinout & Package
MAX1722ELT+T is housed in a 2mm × 2mm × 0.75mm, 6-pin µDFN package (land pattern 90-0004) with exposed thermal pad. Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Connects to resistor divider to set output voltage; 1.235V reference enables 2–5.5V adjustment with ≤20nA bias error. |
| 2 BATT | Battery input & damping switch connection | Primary input path; powers startup circuit directly - enables 0.91V start - and controls internal damping switch for EMI reduction. |
| 3 GND | Power and signal ground | Common return for all internal circuits; must be tied to low-impedance ground plane within 5mm of input/output capacitors. |
| 4 OUT | Regulated power output | Delivers boosted DC output; also supplies bootstrap power to internal gate drivers - no external charge pump required. |
| 5 N.C. | No connect | Unbonded pin; must remain floating - not used for thermal relief or grounding. |
| 6 LX | Switch node | Drain of internal N-channel FET and P-channel synchronous rectifier; connects to inductor - requires shortest possible PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces BOM cost, board area, and conduction losses by replacing ~0.3V diode drop with <0.1V MOSFET RDS(ON) drop. |
| Integrated damping switch | Actively suppresses LX ringing induced by inductor parasitics - lowers radiated EMI without increasing output ripple or sacrificing efficiency. |
| Ultra-low quiescent current | 1.5μA supply current into OUT - extends battery life in intermittently active devices like wireless sensor tags or glucose monitors. |
| 0.91V guaranteed startup | Starts regulation even when battery drops to 0.91V (at +25°C) - critical for maximizing usable capacity from single alkaline cells. |
| Adjustable output (2–5.5V) | Configured via external resistive divider on FB pin - supports multiple system voltage rails (e.g., 2.8V for BLE radio, 3.3V for MCU) from one BOM part. |
Applications
| Wearable Medical Sensors | Remote Wireless Transmitters |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) using coin-cell battery and low-power analog front-end. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 3.0V to ADC and Bluetooth LE radio from declining 0.9–1.5V zinc-air cell. Use Value: 0.91V startup and 1.5μA quiescent current enable >365-day runtime; damping switch meets FCC Class B radiated emissions limits. |
Use Scenario: Battery-powered soil moisture sensor transmitting data every 15 minutes via sub-GHz RF link. IC Role / Device Role / Timing Role: Boost converter powering 3.3V RF transceiver and microcontroller during brief 100ms transmit bursts. Use Value: Adjustable output allows optimal 3.3V rail for RF IC; PFM control maintains >85% efficiency at 1–10mA burst loads. |
| Low-Power Hand-Held Instruments | Digital Still Cameras (Compact) |
Use Scenario: Portable multimeter powered by two AAA alkaline cells with auto-ranging LCD and backlight. IC Role / Device Role / Timing Role: Generates regulated 5.0V for LCD driver and 3.3V for MCU from 1.0–3.0V battery stack. Use Value: 2–5.5V adjustable output eliminates need for multiple fixed regulators; TSOT/µDFN footprint saves space in slim enclosure. |
Use Scenario: Entry-level digital camera using single Li+ cell to power image sensor, flash LED, and SD card interface. IC Role / Device Role / Timing Role: Supplies 2.8V to CMOS image sensor and 3.3V to memory controller during capture sequence. Use Value: Synchronous rectification avoids heat buildup near optics; 150mA output supports simultaneous sensor readout and flash charging. |
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+T | Fixed 3.3V output; includes active-low SHDN pin and same damping switch; identical µDFN package and pinout except SHDN replaces BATT. | Used where system requires hardwired 3.3V rail and controlled power sequencing - e.g., USB-powered accessories with enable logic. | Select MAX1724ELT33+T if output voltage is fixed and shutdown control is needed; MAX1722ELT+T is preferred for flexible voltage scaling or absence of SHDN signal. |
| Texas Instruments TPS61200DRCT | 0.3V min input; 1.2V to 5.5V adjustable output; 2.3μA quiescent current; no integrated damping switch; 3mm × 3mm QFN-10 package. | Targets ultra-low-input applications (e.g., energy harvesting) but lacks EMI suppression - requires external snubber for Class B compliance. | Choose TPS61200DRCT only when input falls below 0.8V; MAX1722ELT+T offers superior EMI performance and smaller footprint for standard battery systems. |
Compared with MAX1724ELT33+T, the MAX1722ELT+T trades shutdown control for lower startup voltage and direct battery coupling; versus TPS61200DRCT, it delivers better EMI behavior and 35% smaller package at the cost of slightly higher minimum input.
Availability
MAX1722ELT+T is available at Aetrix Electronics and suitable for wearable medical sensors, remote wireless transmitters, and low-power hand-held instruments requiring stable component supply with long-term lifecycle support.
Supply support for MAX1722ELT+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, medical, and communications applications.
The MAX1722ELT+T belongs to Maxim's ultra-low-quiescent-current boost converter product line, engineered specifically for battery-constrained systems where startup voltage, light-load efficiency, and EMI control are non-negotiable design requirements.
FAQ
What is the minimum input voltage required for the MAX1722ELT+T to start up?
The MAX1722ELT+T guarantees startup at 0.91V input at +25°C, with operation supported down to 0.8V across the full -40°C to +85°C temperature range. This capability stems from its dedicated BATT-powered startup circuit - unlike the MAX1723, which relies on OUT pin power and requires an external Schottky diode for sub-1.2V startup. The MAX1722ELT+T achieves this without added components.
Does the MAX1722ELT+T include a shutdown function?
No, the MAX1722ELT+T does not feature a shutdown input. It is the non-SHDN variant in the MAX1722/MAX1723/MAX1724 family - pin 2 is BATT, not SHDN. If shutdown control is required, use MAX1723ELT+T (adjustable, with SHDN) or MAX1724ELTxx+T (fixed-output, with SHDN). The MAX1722ELT+T remains enabled whenever valid input voltage is present.
How do I set the output voltage for the MAX1722ELT+T?
Set the output voltage using a resistor divider from OUT to GND with the junction connected to FB. With VFB = 1.235V, calculate R2 = R1 × (VOUT/1.235 − 1). Select R1 between 100kΩ and 1MΩ to limit FB leakage error (≤20nA). For example, for 3.3V output and R1 = 330kΩ, R2 ≈ 550kΩ. Avoid values outside this range to maintain accuracy and noise immunity.
What package type and dimensions does the MAX1722ELT+T use?
The MAX1722ELT+T uses a 2mm × 2mm × 0.75mm, 6-pin µDFN package (outline 21-0164, land pattern 90-0004) with exposed thermal pad. Pin 1 is marked by a dot; pin order is FB–BATT–GND–OUT–N.C.–LX. This package is RoHS-compliant, lead(Pb)-free, and rated for reflow up to +260°C - identical to the MAX1724ELTxx+T series but with different pin mapping.
Does the MAX1722ELT+T include EMI suppression features?
Yes, the MAX1722ELT+T integrates a dedicated damping switch connected to the BATT pin that actively suppresses inductor ringing at the LX node. This reduces radiated EMI without impacting output ripple or efficiency - a key differentiator from competitors like TPS61200. The damping switch is enabled automatically during discontinuous conduction mode and requires no external components or configuration.
MAX1722ELT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1722ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1722ELT+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 MAX1722ELT+T reliable?
The price and inventory of MAX1722ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1722ELT+T is usually 5 days.
3.What payment methods are accepted for MAX1722ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1722ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1722ELT+T?
MAX1722ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1722ELT+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 MAX1722ELT+T?
For technical support, including MAX1722ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1722ELT+T requirements.
6.How does Aetrix verify that MAX1722ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX1722ELT+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 MAX1722ELT+T meets industry standards.
7.What is the process for return or replacement of MAX1722ELT+T?
All MAX1722ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1722ELT+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 MAX1722ELT+T part is unused and in its original packaging.
Return procedure for MAX1722ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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