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Analog Devices Inc./Maxim Integrated MAX17222ALT+
- Part No.:
- MAX17222ALT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17222ALT+.pdf
- Description:
- IC REG BOOST ADJ 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
The MAX17222ALT+ from Analog Devices is an ultra-low-quiescent-current synchronous boost DC-DC converter optimized for primary-cell and supercapacitor-powered systems. It delivers up to 500mA peak inductor current, supports 400mV–5.5V input, provides 1.8V–5V resistor-selectable output, and features True Shutdown™ with 0.5nA shutdown current - enabling multi-year battery life in optical heart-rate monitors and wearable medical sensors.
For engineers reviewing the MAX17222ALT+ datasheet, MAX17222ALT+ pinout, MAX17222ALT+ application, or MAX17222ALT+ equivalent, this page delivers verified technical context, validated pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and application-level differences - all grounded in the official MAX17220–MAX17225 datasheet Rev 8 (10/21).
Technical Context
The MAX17222ALT+ employs a fixed-on-time, current-limited PFM control scheme with automatic mode switching between ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM) based on load current. Its 300ns minimum on-time and 500mA peak inductor current limit enable stable regulation down to 400mV input under light loads.
True Shutdown™ disconnects OUT from IN via internal MOSFETs, eliminating reverse current across VOUT = 0V–5V and reducing system shutdown current to 0.5nA. The device uses a single 1% resistor on the SEL pin to set output voltage in 100mV steps from 1.8V to 5V - no feedback divider required.
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) - preserves supercapacitor charge during RTC backup. |
| 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 5V, resistor-selectable in 100mV steps - eliminates BOM variants for multiple voltage rails. |
| Peak Inductor Current Limit | 500mA - balances efficiency and solution size for 2.2µH inductors in wearable OHRM designs. |
| Startup Input Voltage | 0.88V typical - ensures reliable boot from partially discharged batteries. |
| Efficiency (Peak) | 95% - minimizes thermal rise in sealed wearables and compact medical enclosures. |
Pinout & Package
MAX17222ALT+ is supplied in a 2mm × 2mm, 6-pin µDFN package (package code L622+1C) with wettable flank capability for automated optical inspection. Pin mapping is validated per Maxim/Analog Devices datasheet Rev 8, Figure 11 (µDFN top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Power Supply | Accepts 400mV–5.5V; requires ≥10µF X5R ceramic capacitor for stability and EMI reduction. |
| 2 (OUT) | Regulated Output | Delivers 1.8V–5V; connects to 10µF output capacitor and load - no external feedback needed. |
| 3 (GND) | Power Ground | Low-impedance return path; must be tied directly to input/output capacitor grounds with minimal trace length. |
| 4 (SEL) | Output Voltage Select | Single 1% resistor to GND sets VOUT; detection time ≤600µs avoids startup delay penalties. |
| 5 (LX) | Switching Node | Connects inductor between IN and LX; high dv/dt node - keep trace short and away from sensitive analog paths. |
| 6 (EN) | Enable Input | Active-high logic; supports ETP (enable transient protection) - maintains regulation if VIN drops to 400mV post-startup. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-input isolation - critical for RTC/sensor backup systems. |
| Post-Startup Enable Transient Protection (ETP) | Maintains regulation at VIN ≥400mV after startup - prevents brownout resets in primary-cell wearables during pulse loads. |
| Single-Resistor Output Selection (RSEL) | Eliminates feedback divider network - reduces BOM count, PCB area, and quiescent current waste in nano-power designs. |
| Ultra-Low-Power Mode (ULPM) | 11.5Hz minimum switching frequency at 1.49mA transition point - extends battery life by minimizing switching losses at standby. |
| Fixed 300ns On-Time Architecture | Enables stable operation at sub-1V inputs without external compensation - simplifies design for low-VIN energy harvesting. |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
|
Use Scenario: Primary-cell wearable sensor powering green/red/IR LEDs for photoplethysmography (PPG) with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Boost converter supplying regulated 3.3V to LED driver and microcontroller from 0.8V–1.6V silver-oxide cell. Use Value: 300nA quiescent current and 400mV operational input extend battery life beyond 2 years; ETP prevents LED flicker during RF transmit bursts. |
Use Scenario: Maintaining real-time clock and alarm buzzer functionality during main power loss using a 5.5V supercapacitor. IC Role / Device Role / Timing Role: Regulating stable 3.3V output from decaying supercap voltage (5.5V → 400mV) while blocking reverse current. Use Value: True Shutdown™ ensures zero reverse leakage into supercap; 0.5nA shutdown current preserves charge for >100 days of RTC hold-up. |
| Primary-Cell Portable Sensors | Tiny Low-Power IoT Sensors |
|
Use Scenario: AAA/AA-powered environmental sensor node (temperature/humidity) with intermittent BLE advertising. IC Role / Device Role / Timing Role: Providing 3.0V rail to MCU and sensor ICs from 1.0V–1.5V alkaline/zinc-air battery under pulsed 20mA loads. Use Value: 500mA peak current limit supports fast sensor wake-up; 95% peak efficiency minimizes thermal impact in sealed plastic enclosures. |
Use Scenario: Coin-cell-powered soil moisture sensor transmitting data every 12 hours via LoRaWAN. IC Role / Device Role / Timing Role: Generating 3.3V from CR2032 (2.0V–3.0V) only during active measurement and radio transmission phases. Use Value: RSEL resistor selection allows one BOM part to serve multiple sensor variants; ULPM extends shelf life to >5 years before deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17220ALT+ | 225mA peak inductor current limit; same 300nA IQ, 0.5nA ISD, and True Shutdown™. | Better suited for <10mA average-load applications (e.g., NFC tags, simple RTC backup) where lower ILIM reduces inductor size/cost. | Select MAX17220ALT+ when peak load current ≤200mA and solution size is prioritized over headroom. |
| MAX17224ALT+ | 1A peak inductor current limit; identical package, pinout, and RSEL interface. | Required for high-pulse-load applications (e.g., 500mA LED flash, motor drivers) where MAX17222ALT+ would enter current-limit foldback. | Choose MAX17224ALT+ when sustained output current exceeds 250mA or peak pulses exceed 400mA. |
Compared with MAX17220ALT+ and MAX17224ALT+, the MAX17222ALT+ offers optimal balance of current capability, quiescent power, and solution size for mid-range wearable and sensor applications - delivering 500mA headroom without overdesigning inductor or PCB footprint.
Availability
MAX17222ALT+ is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and primary-cell portable sensors requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX17222ALT+ 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 (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and healthcare markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power battery and energy-harvesting applications - emphasizing nanoamp quiescent current, sub-1V startup, and minimal external components to enable decade-long operation in wearables and remote sensors.
FAQ
What is the minimum input voltage required for MAX17222ALT+ to start up?
The MAX17222ALT+ has a typical startup input voltage of 0.88V and is guaranteed to start from 0.95V across temperature. Once running, it continues regulating down to 400mV input depending on load - making it ideal for deeply discharged primary cells like silver oxide or zinc air batteries used in wearables and medical devices. This behavior is confirmed in the Electrical Characteristics table (VIN_STARTUP parameter) and supported by the Typical Operating Characteristics plots.
How does the RSEL pin work on MAX17222ALT+, and what resistor values are supported?
The RSEL pin on MAX17222ALT+ accepts a single standard 1% resistor to ground to set output voltage in 100mV increments from 1.8V to 5.0V. For example, a 133kΩ resistor yields 3.0V, while an open circuit gives 1.8V and a short yields 5.0V. The device samples RSEL for ≤600µs at startup - no continuous current draw - preserving battery life. Full resistor values are listed in the RSEL Selection Table (page 12 of datasheet Rev 8).
Does MAX17222ALT+ support True Shutdown™, and what is its shutdown current?
Yes, MAX17222ALT+ features True Shutdown™, which fully disconnects the output from the input using internal MOSFETs - eliminating forward and reverse current flow. Its total shutdown current (ISD_TOTAL) is 0.5nA (typical) across IN and LX pins at +25°C, as specified in the Electrical Characteristics table. This enables ultra-long hold-up times in supercapacitor backup circuits and zero-load battery drain in always-off systems.
What is Enable Transient Protection (ETP), and which versions of the MAX1722x family include it?
Enable Transient Protection (ETP) is a feature exclusive to MAX17220ALT+, MAX17222ALT+, and MAX17224ALT+ that maintains regulation even if input voltage drops to 400mV after startup - preventing brownout resets during pulsed loads. It operates by biasing the EN pin internally and adds a small ETP-related quiescent current dependent on pull-up resistance and efficiency. MAX17221/23/25 lack ETP and require stable VIN above 0.95V post-startup.
What package type and footprint does MAX17222ALT+ use, and is it RoHS compliant?
MAX17222ALT+ is packaged in a 2mm × 2mm, 6-pin µDFN (package code L622+1C, outline 21-0164) with wettable flanks for automated optical inspection. It is RoHS compliant and lead-free, as indicated by the "+" suffix in the package code. Land pattern requirements are defined in Land Pattern Number 90-0004, and thermal performance (θJA = 223.6°C/W) is characterized on a four-layer board per JEDEC JESD51-7.
MAX17222ALT+ 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):
- 0.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX17222ALT+ FAQ
1.How can I place an order for MAX17222ALT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17222ALT+ 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 MAX17222ALT+ reliable?
The price and inventory of MAX17222ALT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17222ALT+ is usually 5 days.
3.What payment methods are accepted for MAX17222ALT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17222ALT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17222ALT+?
MAX17222ALT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17222ALT+ 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 MAX17222ALT+?
For technical support, including MAX17222ALT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17222ALT+ requirements.
6.How does Aetrix verify that MAX17222ALT+ is sourced from the original manufacturer or authorized distributors?
All MAX17222ALT+ 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 MAX17222ALT+ meets industry standards.
7.What is the process for return or replacement of MAX17222ALT+?
All MAX17222ALT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17222ALT+, 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 MAX17222ALT+ part is unused and in its original packaging.
Return procedure for MAX17222ALT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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