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Analog Devices Inc./Maxim Integrated MAX17221ENT+T
- Part No.:
- MAX17221ENT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-XFBGA, WLBGA
- Datasheet:
-
MAX17221ENT+T.pdf
- Description:
- IC REG BOOST ADJ 6WLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,725
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Product details
Overview
The MAX17221ENT+T from Analog Devices is a nanoPower synchronous boost DC-DC converter optimized for ultra-low-quiescent-current battery-powered systems. It delivers 225mA peak inductor current, supports 400mV–5.5V input and 1.8V–5V resistor-selectable output, and features True Shutdown™ with 0.5nA shutdown current-enabling multi-year operation in optical heart-rate monitoring (OHRM) LED drivers and wearable medical sensors.
For engineers reviewing the MAX17221ENT+T datasheet, MAX17221ENT+T pinout, MAX17221ENT+T application, or MAX17221ENT+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world efficiency curves, and two rigorously cross-checked alternative parts for low-power boost conversion in primary-cell and supercapacitor backup designs.
Technical Context
The MAX17221ENT+T implements a fixed-on-time, current-limited PFM control scheme with three automatic power modes (ULPM/LPM/HPM) to maintain high efficiency from 300nA quiescent load to full 225mA output. Its 300ns minimum on-time and 90–150ns minimum off-time enable stable regulation down to 400mV input under light loads.
True Shutdown™ disconnects OUT from IN using internal MOSFETs, eliminating reverse current flow even when VOUT = 0V–5V and ensuring zero leakage path during system sleep. The single RSEL resistor interface reads voltage setting in ≤600μs at startup with ±1% accuracy, avoiding continuous feedback resistor current drain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current (OUT) | 300nA typical - enables >10-year battery life in always-on IoT sensors |
| Shutdown Current | 0.5nA total (IN + LX) - eliminates parasitic drain in long-term storage |
| Input Voltage Range | 400mV to 5.5V - starts from near-dead primary cells (e.g., silver oxide, zinc air) |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set by single ±1% resistor, no feedback divider needed |
| Peak Inductor Current Limit | 225mA - matches compact 2.2μH inductors for minimal solution size |
| Startup Input Voltage | 0.88V typical - boots from residual charge in supercapacitors or weak batteries |
| Peak Efficiency | 95% - sustains high conversion efficiency across 1μA–200mA load range |
Pinout & Package
MAX17221ENT+T uses a 2mm × 2mm, 6-pin μDFN package (package code L622+1C) with wettable flank capability for automated optical inspection. All pins are surface-mount with 0.5mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output node | Connects to 10μF X5R ceramic capacitor; supplies regulated voltage to load |
| 2 (LX) | Switching node | Drives external inductor; requires short, low-inductance PCB trace to minimize EMI |
| 3 (GND) | Power ground reference | Must tie directly to input/output capacitor grounds with minimal trace length |
| 4 (SEL) | Output voltage selection | Accepts single ±1% resistor to GND; detection completes in ≤600μs at startup |
| 5 (IN) | Input supply rail | Accepts 400mV–5.5V; requires 10μF X5R ceramic capacitor for stability |
| 6 (EN) | Active-high enable | Pulled high internally after startup; compatible with open-drain or push-pull GPIO |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with bidirectional isolation between IN and OUT |
| NanoPower PFM Control | Three auto-switching modes (ULPM/LPM/HPM) maintain 95% peak efficiency from 1μA to 200mA |
| Single-Resistor Output Setting | RSEL interface eliminates feedback divider current loss and reduces BOM count by one resistor |
| Ultra-Low Startup Voltage | 0.88V typical startup enables use with depleted primary cells and supercapacitors below 1V |
| Integrated Protection | No reverse current flow when VOUT = 0V–5V; LX clamped internally to GND and OUT |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
Use Scenario: Primary-cell wearable sensor powering pulsed OHRM LEDs at 3.3V from 0.9–1.6V silver oxide battery. IC Role / Device Role / Timing Role: Boost converter providing stable 3.3V rail with <300nA quiescent draw during sensor idle periods. Use Value: Extends battery life beyond 2 years by minimizing standby current and enabling deep discharge utilization. |
Use Scenario: Maintaining 3.3V RTC supply during main power loss using 5.5V/100mF supercapacitor. IC Role / Device Role / Timing Role: Regulating constant 3.3V output while drawing <0.5nA from supercap during retention. Use Value: Preserves timekeeping for >72 hours after main power failure without reverse current leakage. |
| Primary-Cell Portable Systems | Tiny Low-Power IoT Sensors |
Use Scenario: AAA/AA-powered environmental sensor logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Generating 3.0V system rail from 1.2V alkaline cell with 0.88V startup capability. Use Value: Enables full utilization of battery capacity down to 400mV, increasing usable energy by ~25%. |
Use Scenario: Sub-1cm³ soil moisture node powered by coin-cell, transmitting data via BLE once per hour. IC Role / Device Role / Timing Role: Providing 1.8V microcontroller supply with 300nA quiescent current during 59-minute sleep cycles. Use Value: Achieves >5-year field lifetime by eliminating feedback resistor losses and optimizing light-load efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | 350nA IQ_OUT, 500mA ILIM, 0.7V startup, WSON-6 package | Higher peak current but 150mV higher minimum input; less suitable for sub-0.9V primary cells | Select when higher output current (>225mA) is required and input stays ≥0.7V |
| SPV1040EDTR | 250nA IQ, 1.2A ILIM, 0.3V startup, QFN-16 package | Lower startup voltage but larger footprint and no True Shutdown; reverse current not blocked | Select for ultra-low-voltage energy harvesting where reverse isolation is not critical |
Compared with TPS61291DRVR and SPV1040EDTR, the MAX17221ENT+T uniquely combines 0.5nA shutdown, True Shutdown isolation, and 0.88V startup in a 2mm × 2mm μDFN-making it optimal for space-constrained, long-life primary-cell wearables requiring absolute zero leakage during sleep.
Availability
MAX17221ENT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring (OHRM) LED drivers, supercapacitor RTC backup systems, and primary-cell portable systems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX17221ENT+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and low-power sensing markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power battery and supercapacitor applications where nanocurrent operation, sub-1V startup, and true output isolation are mandatory-targeting next-generation wearables and maintenance-free IoT endpoints.
FAQ
What is the minimum input voltage required for the MAX17221ENT+T to start up?
The MAX17221ENT+T has a typical startup input voltage of 0.88V and guarantees operation down to 0.95V across temperature. It can continue regulating down to 400mV after startup depending on load current, making it ideal for deeply discharged primary cells like silver oxide or zinc air batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Startup Input Voltage" and "Minimum Input Voltage" parameters.
How does the MAX17221ENT+T achieve 0.5nA shutdown current?
The MAX17221ENT+T achieves 0.5nA total shutdown current (ISD_TOTAL) by fully disconnecting both IN and LX from internal circuitry during True Shutdown™ mode, with no active bias paths. This value includes leakage from IN and LX pins only-no external pullup resistors-and is measured at TA = +25°C with RL = 3kΩ and VEN = 0V, as specified in the Electrical Characteristics table.
Can the MAX17221ENT+T be used with a supercapacitor for RTC backup?
Yes-the MAX17221ENT+T is explicitly validated for supercapacitor RTC backup applications, supporting input voltages from 400mV to 5.5V and providing reverse current blocking to prevent RTC battery drain. Figure 10 in the datasheet shows a complete MAX1722x/MAX14575/DS1341 solution preserving 3.3V RTC supply down to 400mV supercap voltage with no reverse leakage.
What is the function of the SEL pin on the MAX17221ENT+T?
The SEL pin on the MAX17221ENT+T accepts a single ±1% resistor to ground to set the output voltage from 1.8V to 5.0V in 100mV steps. It draws up to 200μA for ≤600μs during startup to detect resistance value, then enters high-impedance state-eliminating continuous current loss unlike traditional feedback dividers. Resistor values are listed in the RSEL Selection Table (page 12).
Does the MAX17221ENT+T include enable transient protection (ETP)?
No-the MAX17221ENT+T does not include Enable Transient Protection (ETP). ETP is only present in the MAX17220, MAX17222, and MAX17224 variants. The MAX17221ENT+T uses an EN pin compatible with push-pull or open-drain GPIO but lacks the internal circuitry that allows continued regulation when input drops to 400mV post-startup. This distinction is clearly stated in the General Description and Benefits sections.
MAX17221ENT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-XFBGA, WLBGA
- 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):
- 0.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 5V
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLP (1.42x0.89)
MAX17221ENT+T FAQ
1.How can I place an order for MAX17221ENT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17221ENT+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 MAX17221ENT+T reliable?
The price and inventory of MAX17221ENT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17221ENT+T is usually 5 days.
3.What payment methods are accepted for MAX17221ENT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17221ENT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17221ENT+T?
MAX17221ENT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17221ENT+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 MAX17221ENT+T?
For technical support, including MAX17221ENT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17221ENT+T requirements.
6.How does Aetrix verify that MAX17221ENT+T is sourced from the original manufacturer or authorized distributors?
All MAX17221ENT+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 MAX17221ENT+T meets industry standards.
7.What is the process for return or replacement of MAX17221ENT+T?
All MAX17221ENT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17221ENT+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 MAX17221ENT+T part is unused and in its original packaging.
Return procedure for MAX17221ENT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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