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Analog Devices Inc./Maxim Integrated MAX17220ALT+T
- Part No.:
- MAX17220ALT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17220ALT+T.pdf
- Description:
- IC REG BOOST ADJ 225MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,397
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Product details
Overview
MAX17220ALT+T from Analog Devices is an ultra-low-quiescent-current synchronous boost DC-DC converter optimized for primary-cell and supercapacitor-powered wearable and IoT sensors. It delivers 1.8V–5V output via a single 1% resistor, supports 400mV minimum operating input, achieves 95% peak efficiency, and features True Shutdown™ with 0.5nA shutdown current - enabling multi-year battery life in optical heart-rate monitors and RTC backup systems.
For engineers reviewing the MAX17220ALT+T datasheet, MAX17220ALT+T pinout, MAX17220ALT+T application, or MAX17220ALT+T equivalent, key selection criteria include its 300nA quiescent supply current into OUT, 225mA peak inductor current limit, 0.88V minimum startup voltage, 2mm × 2mm μDFN-6 package, and enable transient protection (ETP) for stable operation down to 400mV input under load.
Technical Context
The MAX17220ALT+T implements 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 maximum switch on-time and 225mA peak inductor current limit are tightly coupled to achieve sub-μA quiescent operation while maintaining regulation at ultra-low input voltages.
True Shutdown™ uses internal MOSFETs to fully disconnect OUT from IN, eliminating reverse current across VOUT = 0V–5V and enabling zero-load leakage critical for energy harvesting and long-life battery systems. The RSEL pin enables resistor-based output voltage selection without continuous divider current, reducing system-level power overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current into OUT | 300nA typical - enables >10-year battery life in always-on sensor nodes |
| Shutdown Current | 0.5nA total (IN + LX) - preserves supercapacitor charge during system sleep |
| Input Voltage Range | 400mV to 5.5V - operates directly from partially discharged alkaline/coin cells or supercaps |
| Output Voltage Range | 1.8V to 5V, 100mV/step - set by single 1% resistor (e.g., open = 1.8V, 133kΩ = 3.0V) |
| Peak Inductor Current Limit | 225mA - matches compact 2.2µH inductors for minimal solution size in wearables |
| Minimum Startup Voltage | 0.88V typical - boots from near-dead primary cells without external assist |
| Package | 2mm × 2mm, 6-pin μDFN - fits <3mm² PCB area in space-constrained hearables |
Pinout & Package
MAX17220ALT+T is housed in a 2mm × 2mm, 6-pin µDFN package (package code L622+1C) with wettable flanks for automated optical inspection. Thermal resistance θJA = 223.6°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output | Connects to 10µF X5R ceramic capacitor; supplies power to MCU, sensor, or RF IC |
| 2 (LX) | Switching node | Drives external inductor; requires short, low-inductance trace to minimize EMI and losses |
| 3 (GND) | Power ground | Common reference for IN, OUT, SEL; must tie directly to input/output capacitor grounds |
| 4 (SEL) | Voltage select input | Reads single 1% resistor to set output; detection time ≤600µs; max 2pF trace capacitance |
| 5 (IN) | Input supply | Accepts 400mV–5.5V; connects to 10µF X5R capacitor; powers internal circuitry pre-startup |
| 6 (EN) | Active-high enable | Enables ETP function post-startup; allows operation down to 400mV input under load |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-input isolation and no reverse current up to 5V |
| Enable Transient Protection (ETP) | Maintains regulation at IN ≥400mV after startup - prevents brownout during battery voltage sag |
| RSEL Output Programming | Single 1% resistor sets 1.8V–5.0V output in 100mV steps - eliminates feedback divider leakage |
| PFM Control with Mode Switching | Automatically transitions between ULPM (11.5Hz min), LPM, and HPM to optimize efficiency across 10nA–200mA loads |
| NanoPower Operation | 300nA IQ into OUT + 0.5nA IQ into IN/LX - enables >10-year runtime on AAA alkaline in OHRM sensors |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
|
Use Scenario: Primary-cell-powered wrist-worn sensor driving pulsed LEDs and photodiode amplifier. IC Role / Device Role / Timing Role: Boosts 0.8–1.6V silver-oxide cell to stable 3.3V for LED driver and analog front-end. Use Value: 225mA peak current limit and ETP ensure uninterrupted LED pulses even as battery voltage drops below 1V. |
Use Scenario: Maintaining real-time clock and alarm buzzer during main power failure using 5.5V supercap. IC Role / Device Role / Timing Role: Regulates 3.3V output from decaying supercap (down to 400mV) with reverse-current blocking. Use Value: True Shutdown™ prevents supercap self-discharge; 0.5nA shutdown current extends backup duration beyond 30 days. |
| Tiny Low-Power IoT Sensor | Wearable Medical Equipment |
|
Use Scenario: Coin-cell-powered temperature/humidity node transmitting BLE beacons every 5 minutes. IC Role / Device Role / Timing Role: Generates 3.0V for BLE SoC and sensor ICs from 1.2V zinc-air cell with ultra-low IQ. Use Value: 300nA quiescent current into OUT reduces average system IQ to <1µA - enabling 7+ year battery life. |
Use Scenario: FDA-classified patch monitor measuring ECG or SpO₂ continuously for 72+ hours. IC Role / Device Role / Timing Role: Powers analog signal chain and low-power MCU from AAA alkaline with tight output accuracy. Use Value: ±1.5% output accuracy in LPM ensures consistent ADC reference and sensor biasing across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ALT+T | 500mA peak inductor current limit; identical package, pinout, and feature set | Better suited for higher-output-current loads (e.g., multi-LED OHRM or BLE + NFC) | Select when >200mA peak load current is required; same PCB layout and firmware |
| TPS61291DRVR | 400nA IQ into VOUT; 500mA ILIM; no ETP; 1.2V–5.5V input; 1.8V–5.5V output | Lacks enable transient protection and true shutdown reverse-current blocking | Use where lowest possible IQ is critical and input voltage remains >1V; verify reverse-current path in backup systems |
Compared with MAX17222ALT+T, the MAX17220ALT+T offers lower peak current and smaller inductor sizing for ultra-compact wearables; compared with TPS61291DRVR, it provides guaranteed 400mV operation and robust reverse-current isolation essential for supercapacitor backup integrity.
Availability
MAX17220ALT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and primary-cell IoT sensor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17220ALT+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 (acquired Maxim Integrated in 2021) designs precision analog, mixed-signal, and power management ICs for high-reliability industrial, medical, and automotive systems.
The MAX17220–MAX17225 family targets ultra-low-power battery-operated devices, delivering nano-power boost conversion with integrated True Shutdown™ and resistor-programmable outputs for minimal BOM count and longest possible runtime.
FAQ
What is the minimum input voltage required for MAX17220ALT+T to start up?
The MAX17220ALT+T has a typical minimum startup input voltage of 0.88V at +25°C with a 3kΩ load. It is guaranteed to start from 0.95V across -40°C to +125°C. Once started, it continues regulating down to 400mV input depending on load current - a key capability for deeply discharged primary cells. This behavior is enabled by the internal bootstrap circuit drawing current from the output rail during startup.
How does the RSEL pin set the output voltage on MAX17220ALT+T?
The MAX17220ALT+T uses the RSEL pin to detect a single standard 1% resistor connected to GND, selecting output voltage in 100mV steps from 1.8V to 5.0V. For example, leaving RSEL open sets 1.8V; a 133kΩ resistor sets 3.0V. The device samples RSEL for ≤600µs at startup with <2pF trace capacitance required for accurate detection - eliminating continuous divider current and saving µA-level power in always-on systems.
Does MAX17220ALT+T support True Shutdown™, and what does that mean for system design?
Yes, MAX17220ALT+T implements True Shutdown™, which fully disconnects the output from the input using internal MOSFETs. In shutdown, total current into IN and LX is just 0.5nA, and no reverse current flows even when VOUT is held at 0V–5V. This eliminates supercapacitor self-discharge and preserves battery charge during extended sleep - critical for multi-year IoT deployments and RTC backup circuits where leakage must be sub-nA.
What is Enable Transient Protection (ETP), and which versions of MAX17220ALT+T include it?
Enable Transient Protection (ETP) is a feature of the MAX17220ALT+T that maintains regulation even when input voltage sags to 400mV after startup - preventing brownout during battery voltage transients. It is exclusive to MAX17220/MAX17222/MAX17224 variants. ETP requires an external pullup resistor on EN and adds a small, calculable IQ_ETP current (e.g., ~61nA with 33MΩ pullup), but enables robust operation in variable-voltage primary-cell systems.
Can MAX17220ALT+T be used with supercapacitors, and how does it handle reverse current?
Yes, MAX17220ALT+T is explicitly designed for supercapacitor backup applications like RTC preservation and alarm buzzers. Its True Shutdown™ architecture blocks reverse current completely - no current flows from VOUT back to VIN even when VOUT exceeds VIN or drops to 0V. This prevents supercapacitor discharge through the IC during main power loss, ensuring reliable backup power delivery down to 400mV capacitor voltage.
MAX17220ALT+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):
- 0.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 225mA (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)
MAX17220ALT+T FAQ
1.How can I place an order for MAX17220ALT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17220ALT+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 MAX17220ALT+T reliable?
The price and inventory of MAX17220ALT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17220ALT+T is usually 5 days.
3.What payment methods are accepted for MAX17220ALT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17220ALT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17220ALT+T?
MAX17220ALT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17220ALT+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 MAX17220ALT+T?
For technical support, including MAX17220ALT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17220ALT+T requirements.
6.How does Aetrix verify that MAX17220ALT+T is sourced from the original manufacturer or authorized distributors?
All MAX17220ALT+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 MAX17220ALT+T meets industry standards.
7.What is the process for return or replacement of MAX17220ALT+T?
All MAX17220ALT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17220ALT+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 MAX17220ALT+T part is unused and in its original packaging.
Return procedure for MAX17220ALT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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