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Analog Devices Inc./Maxim Integrated MAX17221ELT+T
- Part No.:
- MAX17221ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17221ELT+T.pdf
- Description:
- IC REG BOOST ADJ 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,410
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Product details
Overview
The MAX17221ELT+T from Analog Devices is a nanoPower synchronous boost DC-DC converter optimized for ultra-low-quiescent-current battery-powered systems, featuring 300nA quiescent supply current into OUT, 225mA peak inductor current limit, True Shutdown™ with 0.5nA shutdown current, and single-resistor-selectable output voltage (1.8V–5V) - deployed in optical heart-rate monitoring LED drivers and supercapacitor RTC backup circuits.
For engineers reviewing the MAX17221ELT+T datasheet, MAX17221ELT+T pinout, MAX17221ELT+T application, or MAX17221ELT+T equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters across temperature, package-specific thermal resistance data, and real-world alternative selection guidance for primary-cell and low-power IoT designs.
Technical Context
The MAX17221ELT+T implements a fixed-on-time, current-limited PFM control scheme enabling operation down to 400mV input while maintaining regulation under load, with automatic mode transitions between ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM) based on output current thresholds. Its 300ns maximum switch on-time and 225mA N-channel MOSFET current limit define light-load efficiency and startup behavior.
True Shutdown™ disconnects OUT from IN via internal switches, eliminating reverse current flow even when VOUT = 0V–5V and preventing battery drain during system sleep. The device supports post-startup enable transient protection (ETP) only in MAX17220/222/224 variants - MAX17221ELT+T does not include ETP, requiring external EN pullup management for stable low-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current (OUT) | 300nA typical - enables multi-year battery life in always-on wearable sensors |
| Shutdown Current | 0.5nA total (IN + LX) - ensures near-zero leakage during system hibernation |
| Input Voltage Range | 400mV to 5.5V - supports direct operation from partially discharged primary cells (e.g., silver oxide, zinc-air) |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set by single ±1% resistor (e.g., open = 1.8V, 133kΩ = 3.0V) |
| Peak Inductor Current Limit | 225mA - defines maximum deliverable output current and inductor sizing (e.g., 2.2µH typical) |
| Startup Input Voltage | 0.88V typical - allows cold-start from weak batteries without external charge pump |
| Package | 2mm × 2mm, 6-pin µDFN - enables compact PCB layout with minimal footprint and thermal resistance (θJA = 223.6°C/W) |
Pinout & Package
MAX17221ELT+T is supplied in a 2mm × 2mm, 6-pin µDFN package (package code L622+1C, outline 21-0164) with exposed pad for thermal dissipation. Pin mapping follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output node | Connects to 10µF X5R ceramic capacitor; supplies power to load; voltage set by RSEL resistor |
| 2 (LX) | Switching node | Drives external inductor; requires short, low-inductance trace to minimize EMI and switching losses |
| 3 (GND) | Power ground reference | Common return for IN, OUT, SEL; must be low-impedance connection to PCB ground plane |
| 4 (SEL) | Output voltage select input | Reads single resistor to GND at startup; tolerates ≤2pF parasitic capacitance for accurate detection |
| 5 (IN) | Input power supply | Accepts 400mV–5.5V source; requires 10µF X5R ceramic capacitor close to pin for stability |
| 6 (EN) | Active-high enable input | Must be pulled high ≥600mV to enable; open-drain GPIO compatible; no ETP circuitry in MAX17221 |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-input isolation and zero reverse current up to 5V |
| NanoPower Operation | 300nA quiescent current into OUT enables >10-year battery life in 10µA average-load applications |
| Single-Resistor Output Setting | Eliminates feedback divider network - reduces BOM count, board area, and standby current loss |
| Ultra-Low Startup Voltage | 0.88V typical startup enables use with aging primary cells where voltage drops below 1V |
| PFM Control Architecture | Fixed 300ns on-time with automatic ULPM/LPM/HPM mode switching optimizes efficiency across 10nA–200mA load range |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
Use Scenario: Primary-cell wearable sensor powering pulsed green/red LEDs for photoplethysmography (PPG) with intermittent BLE transmission. IC Role / Device Role / Timing Role: Boost converter supplying regulated 3.0V/3.3V to OHRM LEDs and microcontroller peripherals during brief active periods. Use Value: 300nA quiescent current extends AAA battery life beyond 2 years; 400mV input operation sustains function as cell discharges to end-of-life. |
Use Scenario: Maintaining real-time clock and alarm buzzer operation during main power failure using supercapacitor energy storage. IC Role / Device Role / Timing Role: Regulated 3.3V source that starts from supercapacitor voltages as low as 400mV and blocks reverse current to prevent discharge. Use Value: True Shutdown™ eliminates leakage path; 225mA peak current supports buzzer drive without undershoot; single-resistor setting simplifies BOM. |
| Primary-Cell Portable Systems | Tiny Low-Power IoT Sensors |
Use Scenario: Temperature/humidity sensor node powered by silver-oxide or zinc-air button cells in industrial asset tracking. IC Role / Device Role / Timing Role: Step-up regulator delivering stable 3.0V to ultra-low-power MCU and analog front-end during 10-second measurement bursts. Use Value: 0.88V startup voltage enables full utilization of cell capacity; 95% peak efficiency minimizes heat in sealed enclosures. |
Use Scenario: Sub-1cm³ environmental monitor with BLE connectivity, operating on AAA battery for >5 years. IC Role / Device Role / Timing Role: NanoPower boost converter providing 1.8V–3.3V to sensor ICs and radio during periodic wake-up cycles. Use Value: Single-resistor output selection allows one BOM part to serve multiple voltage requirements; 2mm × 2mm µDFN fits constrained layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17220ELT+T | Same 225mA ILIM, identical pinout and RSEL interface, but includes Enable Transient Protection (ETP) for input voltage droop tolerance | Preferred where IN may dip below 400mV post-startup under load; adds ~60nA ETP-related quiescent overhead | Select MAX17220ELT+T if system requires guaranteed regulation during input transients; otherwise MAX17221ELT+T offers lowest baseline IQ. |
| TPS61291DRVR | 350nA IQ, 200mA ILIM, 0.7V startup, 1.8–5.5V output, same 2mm × 2mm WSON-6 package | Lacks True Shutdown™ (100nA shutdown); uses traditional resistive feedback; lower peak efficiency (92%) at light loads | Choose TPS61291DRVR only if TI ecosystem alignment or legacy design reuse outweighs 200× higher shutdown current and absence of output isolation. |
Compared with MAX17220ELT+T, MAX17221ELT+T trades ETP capability for lower system-level quiescent current in static conditions; versus TPS61291DRVR, it delivers true output-input isolation and 200× lower shutdown leakage - critical for decade-long battery deployments in medical wearables and remote sensors.
Availability
MAX17221ELT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and primary-cell portable systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17221ELT+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, industrial automation, and low-power sensing markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power, battery-constrained applications - emphasizing nanoamp quiescent operation, minimal solution size, and robust startup from depleted primary cells.
FAQ
What is the minimum input voltage required for MAX17221ELT+T to start up?
The MAX17221ELT+T has a typical startup input voltage of 0.88V and is guaranteed to start from 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 specification is verified per the Electrical Characteristics table in the official Analog Devices datasheet Rev 8.
Does MAX17221ELT+T include Enable Transient Protection (ETP)?
No, MAX17221ELT+T does not include Enable Transient Protection. ETP is present only in MAX17220/MAX17222/MAX17224 variants. MAX17221ELT+T requires external EN pin management - such as a pullup resistor or push-pull GPIO - to maintain enable state during input voltage droop. This distinction is explicitly stated in the General Description and Detailed Description sections of the datasheet.
How is the output voltage set on MAX17221ELT+T?
The output voltage of MAX17221ELT+T is set using a single standard ±1% resistor connected between the SEL pin and GND. For example, an open SEL connection yields 1.8V, while a 133kΩ resistor sets 3.0V. The device reads RSEL during a 600µs detection window at startup and tolerates ≤2pF parasitic capacitance - no feedback divider or external reference is needed.
What is the shutdown current of MAX17221ELT+T?
The total shutdown current of MAX17221ELT+T is 0.5nA (typical), measured across both IN and LX pins with EN = 0V and VOUT = 0V at +25°C. This value includes leakage through internal switches in True Shutdown™ mode and is confirmed in the Electrical Characteristics table under "Total Shutdown Current into IN, LX". No external components contribute to this figure.
Which package does MAX17221ELT+T use, and what are its thermal characteristics?
MAX17221ELT+T uses the 2mm × 2mm, 6-pin µDFN package (outline 21-0164, land pattern 90-0004). Its thermal resistance is θJA = 223.6°C/W and θJC = 122°C/W on a four-layer board, per JEDEC JESD51-7 testing. These values are documented in the Package Information section and directly impact maximum continuous output current in thermally constrained layouts.
MAX17221ELT+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:
- -
- Frequency - Switching:
- Up to 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX17221ELT+T FAQ
1.How can I place an order for MAX17221ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17221ELT+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 MAX17221ELT+T reliable?
The price and inventory of MAX17221ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17221ELT+T is usually 5 days.
3.What payment methods are accepted for MAX17221ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17221ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17221ELT+T?
MAX17221ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17221ELT+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 MAX17221ELT+T?
For technical support, including MAX17221ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17221ELT+T requirements.
6.How does Aetrix verify that MAX17221ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX17221ELT+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 MAX17221ELT+T meets industry standards.
7.What is the process for return or replacement of MAX17221ELT+T?
All MAX17221ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17221ELT+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 MAX17221ELT+T part is unused and in its original packaging.
Return procedure for MAX17221ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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