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Analog Devices Inc./Maxim Integrated MAX17222ELT+
- Part No.:
- MAX17222ELT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17222ELT+.pdf
- Description:
- IC REG BOOST ADJ 500MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,582
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Product details
Overview
MAX17222ELT+ from Analog Devices is a nanoPower synchronous boost DC-DC converter optimized for ultra-low-quiescent-current battery-powered systems. It delivers 3V output from 1.5V input, supports 500mA peak inductor current limit, features True Shutdown™ with 0.5nA shutdown current, and uses a single 1% resistor for output voltage selection - enabling long-life operation in optical heart-rate monitoring (OHRM) LED drivers and wearable medical sensors.
For engineers reviewing the MAX17222ELT+ datasheet, MAX17222ELT+ pinout, MAX17222ELT+ application, or MAX17222ELT+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters at +25°C (IN = 1.5V, OUT = 3V, L = 2.2μH, CIN/COUT = 10μF), and real-world alternative selection guidance for primary- and secondary-cell portable systems.
Technical Context
The MAX17222ELT+ implements a fixed-on-time, current-limited PFM control scheme with 300ns maximum switch on-time and 500mA peak inductor current limit. It operates across 400mV–5.5V input range and supports 1.8V–5V output via RSEL resistor, entering ultra-low-power mode (ULPM) below 1.49mA load with 11.5Hz minimum switching frequency.
True Shutdown disconnects OUT from IN with no reverse current over 0V–5V VOUT range, while Enable Transient Protection (ETP) maintains regulation down to 400mV VIN after startup. Its 2mm × 2mm μDFN-6 package integrates synchronous rectification with N-channel RDS(ON) = 62mΩ and P-channel RDS(ON) = 150mΩ at VOUT = 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current (OUT) | 300nA typical - enables multi-year battery life in always-on IoT sensors. |
| Shutdown Current | 0.5nA total (IN + LX) - eliminates parasitic drain during system sleep. |
| Input Voltage Range | 400mV to 5.5V - supports direct operation from partially discharged primary cells (e.g., AAA/AA silver oxide). |
| Output Voltage Range | 1.8V to 5V in 100mV steps - set by single 1% resistor (e.g., 133kΩ for 3.0V), eliminating feedback divider current loss. |
| Peak Inductor Current Limit | 500mA - matches Coilcraft XFL4020-222 (2.2μH) for optimal size/efficiency tradeoff in wearable designs. |
| Startup Input Voltage | 0.88V typical - allows cold-start from supercapacitor backup or weak primary cells. |
| Package | 2mm × 2mm, 6-pin μDFN (L622+1C) - surface-mount footprint compatible with high-density wearable PCB layouts. |
Pinout & Package
MAX17222ELT+ is supplied in a 2mm × 2mm, 6-pin μDFN package (package code L622+1C, outline 21-0164). Thermal resistance θJA = 223.6°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 400mV–5.5V; requires ≥10μF X5R ceramic capacitor to ground for stability and low ESR. |
| 2 (OUT) | Regulated output node | Delivers 1.8V–5V; connects to 10μF output capacitor and load; isolated from IN in True Shutdown mode. |
| 3 (GND) | Power ground reference | Low-impedance return path; must be connected with minimal trace length to both input and output capacitors. |
| 4 (SEL) | Output voltage select input | Reads single 1% resistor to GND (e.g., 133kΩ → 3.0V); detection time ≤600μs; capacitance <2pF required. |
| 5 (LX) | Switching node | Connects inductor between IN and LX; handles 500mA peak current; internal clamps to GND/OUT limit voltage swing. |
| 6 (EN) | Active-high enable control | EN ≥600mV (typ) enables operation; supports ETP for sustained regulation down to 400mV VIN post-startup. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-to-input isolation and zero reverse current over 0–5V VOUT range. |
| Enable Transient Protection (ETP) | Maintains regulated 3V output even when input drops to 400mV after startup - critical for primary-cell voltage sag during sensor bursts. |
| NanoPower PFM Control | 300nA quiescent current into OUT and 11.5Hz minimum switching frequency in ULPM - extends battery life in intermittent-sensing applications. |
| Single-Resistor Output Selection | Eliminates feedback divider current loss and reduces BOM count; supports 1.8V–5V in 100mV steps using standard 1% resistors. |
| Synchronous Rectification | N-channel RDS(ON) = 62mΩ and P-channel RDS(ON) = 150mΩ at 3.3V - achieves 95% peak efficiency without external diode. |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Drivers | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
Use Scenario: Driving pulsed green/red LEDs in wrist-worn wearables powered by AAA silver oxide cells (0.9–1.6V). IC Role / Device Role / Timing Role: Boosts cell voltage to stable 3.0V for LED bias and MCU I/O, maintaining regulation during deep discharge. Use Value: Enables >2-year battery life via 300nA quiescent current and ETP support down to 400mV VIN during LED pulse intervals. |
Use Scenario: Providing regulated 3.3V/5V output from supercapacitor (2.3–5.5V) during main power failure in real-time clocks or alarm buzzers. IC Role / Device Role / Timing Role: Acts as reverse-current-blocking, low-dropout boost regulator that sustains output as supercap voltage decays to 400mV. Use Value: Guarantees uninterrupted RTC timekeeping or uniform buzzer tone without brownout - validated per Figure 10/11 application circuits. |
| Primary-Cell Portable Systems | Tiny, Low-Power IoT Sensors |
Use Scenario: Powering Bluetooth LE temperature sensors (e.g., MAX30205 + Cortex-M4) running on zinc-air or silver-oxide cells. IC Role / Device Role / Timing Role: Generates 3V rail from 0.88V startup; supplies MCU, radio, and sensor with ETP-enabled hold-up during RF transmission. Use Value: Eliminates need for voltage supervisor or backup battery; supports cold-start and deep-discharge operation per Figure 7 design. |
Use Scenario: Supplying 1.8–3.3V to MEMS accelerometers or environmental sensors in coin-cell–powered asset trackers. IC Role / Device Role / Timing Role: Provides regulated output with <1.5μA total system quiescent current (including ETP overhead) in ULPM. Use Value: Achieves 10+ year battery life by minimizing standby current and enabling sub-μA wake-up-triggered measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17220ELT+ | 225mA peak inductor current limit; same 300nA IQ_OUT and True Shutdown, but lower ILIM restricts max output current. | Suitable for <100mA loads (e.g., simple RTC backup); insufficient for OHRM LED pulsing or BLE radio bursts. | Select MAX17220ELT+ only when load current stays below 80mA and solution size is prioritized over drive capability. |
| MAX17224ELT+ | 1A peak inductor current limit; identical pinout, package, and feature set, but higher ILIM increases conduction losses at light loads. | Better for high-pulse-current applications (e.g., 5V buzzer drivers or multi-LED arrays), but draws ~15% more IQ_OUT in ULPM. | Choose MAX17224ELT+ when peak load exceeds 200mA and thermal margin allows higher RMS inductor current. |
Compared with MAX17220ELT+ and MAX17224ELT+, the MAX17222ELT+ offers optimal balance: sufficient 500mA ILIM for BLE/OHRM burst loads while retaining ultra-low 300nA quiescent current and identical μDFN-6 footprint - making it the default choice for mid-power wearable and sensor applications.
Availability
MAX17222ELT+ is available at Aetrix Electronics and suitable for optical heart-rate monitoring (OHRM) LED drivers, supercapacitor-backed RTC/alarm systems, and primary-cell portable wearables requiring stable component supply across extended production lifecycles.
Supply support for MAX17222ELT+ 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, small-footprint boost conversion in battery-constrained devices - emphasizing nanoPower quiescent current, True Shutdown isolation, and single-resistor configurability for rapid wearable and medical sensor development.
FAQ
What is the minimum input voltage required for MAX17222ELT+ to start up?
The MAX17222ELT+ has a typical startup input voltage of 0.88V at +25°C with the Typical Operating Circuit (RL ≥ 3kΩ). This allows reliable cold-start from nearly depleted primary cells or low-voltage supercapacitors, as confirmed in the Electrical Characteristics table under "Minimum Startup Input Voltage".
How does MAX17222ELT+ achieve 0.5nA shutdown current?
The MAX17222ELT+ achieves 0.5nA total shutdown current (ISD_TOTAL) by fully disconnecting the output from the input via True Shutdown™, disabling internal bias networks, and minimizing leakage paths in both IN and LX terminals - verified in the Electrical Characteristics table under "Total Shutdown Current into IN, LX".
Can MAX17222ELT+ operate with input voltage higher than output voltage?
Yes - when VIN exceeds VOUT by ~0.2–0.7V (diode drop), the MAX17222ELT+ clamps VOUT to VIN minus forward voltage, effectively acting as a low-loss pass element. This behavior is documented in the "Operation with VIN > VOUT" section and validated in typical operating characteristics.
What is the purpose of the SEL pin on MAX17222ELT+?
The SEL pin on MAX17222ELT+ reads a single 1% resistor to ground to set output voltage from 1.8V to 5V in 100mV steps (e.g., 133kΩ → 3.0V). It consumes <200μA only for ≤600μs during startup, eliminating continuous divider current loss - a key advantage over traditional feedback networks.
Which inductor is specified for MAX17222ELT+ in the typical application circuit?
The typical operating circuit for MAX17222ELT+ specifies Coilcraft® XFL4020-222 - a 2.2μH shielded power inductor in 4.0mm × 2.0mm × 1.8mm footprint. This value balances efficiency, size, and 500mA peak current handling, as explicitly stated in the "Typical Operating Circuit" and "Inductor Selection" sections.
MAX17222ELT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Strip
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX17222ELT+ FAQ
1.How can I place an order for MAX17222ELT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17222ELT+ 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 MAX17222ELT+ reliable?
The price and inventory of MAX17222ELT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17222ELT+ is usually 5 days.
3.What payment methods are accepted for MAX17222ELT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17222ELT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17222ELT+?
MAX17222ELT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17222ELT+ 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 MAX17222ELT+?
For technical support, including MAX17222ELT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17222ELT+ requirements.
6.How does Aetrix verify that MAX17222ELT+ is sourced from the original manufacturer or authorized distributors?
All MAX17222ELT+ 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 MAX17222ELT+ meets industry standards.
7.What is the process for return or replacement of MAX17222ELT+?
All MAX17222ELT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17222ELT+, 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 MAX17222ELT+ part is unused and in its original packaging.
Return procedure for MAX17222ELT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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