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Analog Devices Inc./Maxim Integrated MAX17220ELT+
- Part No.:
- MAX17220ELT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17220ELT+.pdf
- Description:
- IC REG BOOST ADJ 225MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,221
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Product details
Overview
The MAX17220ELT+ from Analog Devices is an ultra-low-quiescent-current (300nA) synchronous boost DC-DC converter with True Shutdown™, 225mA peak inductor current limit, 0.88V minimum startup voltage, and resistor-selectable output (1.8V–5V). It operates from 400mV input down to battery depletion and delivers regulated power for optical heart-rate monitoring LEDs and supercapacitor-backed RTCs.
For engineers reviewing the MAX17220ELT+ datasheet, MAX17220ELT+ pinout, MAX17220ELT+ application, or MAX17220ELT+ equivalent, this page provides verified technical context, validated pin functions, confirmed nanoPower performance metrics, and real-world wearable/medical use cases - all specific to the MAX17220ELT+ variant in 2mm × 2mm μDFN-6 package.
Technical Context
The MAX17220ELT+ uses a fixed 300ns on-time, current-limited PFM control scheme enabling ultra-low quiescent operation across load ranges. Its True Shutdown™ disconnects output from input with 0.5nA total shutdown current and blocks reverse current up to 5V at VOUT.
It features post-startup Enable Transient Protection (ETP), sustaining regulation down to 400mV input under load, and employs single-resistor (RSEL) output selection with ±1% accuracy - eliminating feedback divider current loss critical for nanocurrent systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current | 300nA into OUT - enables multi-year battery life in always-on sensors |
| Input Voltage Range | 400mV to 5.5V - supports primary cells (e.g., silver oxide, zinc-air) down to end-of-life |
| Startup Voltage | 0.88V (typ) - boots from near-dead batteries without external charge pump |
| Output Voltage Range | 1.8V to 5.0V, selectable via single 1% resistor - reduces BOM count and PCB area vs. dual-resistor feedback |
| Peak Inductor Current Limit | 225mA - optimized for compact 2.2µH inductors in space-constrained wearables |
| True Shutdown Current | 0.5nA total (IN + LX) - eliminates leakage paths during system sleep, preserving backup energy |
| Package | 2mm × 2mm, 6-pin μDFN (L622+1C) - compatible with high-density wearable PCB layouts |
Pinout & Package
MAX17220ELT+ is packaged in a 2mm × 2mm, 6-pin μDFN (package code L622+1C) with wettable flanks for automated optical inspection. Thermal resistance θJA = 223.6°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output node | Connects to 10µF X5R ceramic capacitor; supplies stable voltage to load (e.g., OHRM LED driver) |
| 2 (LX) | Switching node | Drives external inductor; requires short, low-inductance trace to minimize EMI and switching losses |
| 3 (GND) | Power ground reference | Must tie directly to input/output capacitor grounds with minimal trace length to ensure stability |
| 4 (SEL) | Output voltage select input | Accepts single 1% resistor to GND; detection time ≤600µs avoids startup delay in wake-from-sleep systems |
| 5 (IN) | Input supply connection | Accepts 400mV–5.5V sources; requires local 10µF X5R capacitor to suppress battery impedance ripple |
| 6 (EN) | Active-high enable control | Enables ETP mode when pulled high; open-drain or push-pull GPIO compatible per variant-specific circuit rules |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with bidirectional blocking - preserves supercapacitor charge and prevents battery drain during storage |
| Enable Transient Protection (ETP) | Maintains regulation at IN ≥400mV post-startup - eliminates brownout resets in primary-cell wearables during pulse loads |
| NanoPower PFM Control | Fixed 300ns on-time + current limiting - achieves 95% peak efficiency while sustaining 11.5Hz min. switching frequency at 1.49mA transition |
| Single-Resistor Output Selection | RSEL pin reads ±1% resistor in ≤600µs - enables one-BOM-part flexibility across 1.8V–5V designs without feedback divider current loss |
| Ultra-Low-Power Mode (ULPM) | Output biased +2.5% in standby - improves transient response headroom for sensor wake events without sacrificing quiescent current |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
Use Scenario: Primary-cell wearable monitors heart rate using pulsed green LEDs requiring stable 3.3V supply. IC Role / Device Role / Timing Role: Boost converter supplying regulated 3.3V to LED driver IC (e.g., MAX30101) from 0.8–1.6V silver-oxide cell. Use Value: 300nA quiescent current extends battery life beyond 2 years; ETP sustains LED pulses even as cell voltage drops to 400mV. |
Use Scenario: Real-time clock retains time during main power loss using supercapacitor energy. IC Role / Device Role / Timing Role: Regulates 3.3V output from decaying supercapacitor (400mV–5.5V) to power DS1341 RTC. Use Value: True Shutdown blocks reverse current, preventing supercapacitor self-discharge; 0.88V startup ensures RTC remains powered until capacitor depletes fully. |
| Primary-Cell Portable Sensors | Low-Power Wireless Beacons |
Use Scenario: AAAA/AAA alkaline-powered temperature sensor transmits data via Bluetooth LE every 5 minutes. IC Role / Device Role / Timing Role: Supplies 3.0V to BLE SoC (e.g., nRF52832) and analog sensor (MAX30205) from 0.9–1.6V input. Use Value: 400mV operating floor allows full utilization of battery capacity; RSEL simplifies firmware-agnostic hardware reuse across voltage variants. |
Use Scenario: Coin-cell-powered beacon broadcasts location using BLE advertising packets. IC Role / Device Role / Timing Role: Generates stable 3.3V for RF transceiver during 10ms transmit bursts, drawing peak current from 2.2µH inductor. Use Value: 225mA peak current limit matches typical BLE burst requirements; 95% peak efficiency minimizes thermal rise in sealed enclosures. |
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, 0.7V startup, 1.8–5.5V output, no ETP, 5-pin SOT-23 | Lacks enable transient protection; requires dual-resistor feedback; larger footprint | Choose for cost-sensitive, non-ETP designs where 0.7V startup suffices and layout space permits SOT-23 |
| MAX17222ELT+ | 500mA ILIM, same package/features, higher peak current | Suitable for higher-output-current loads (e.g., multi-LED arrays, 5V USB peripherals) | Choose when load exceeds 150mA continuous or requires >225mA pulse capability - identical pinout and RSEL interface |
Compared with TPS61291DRVR, MAX17220ELT+ delivers superior low-voltage robustness (0.88V vs. 0.7V startup) and ETP for primary-cell reliability; compared with MAX17222ELT+, it trades peak current for tighter inductor sizing and lower EMI in ultra-compact wearables.
Availability
MAX17220ELT+ is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and primary-cell portable sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX17220ELT+ 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 aerospace applications.
The MAX17220–MAX17225 family targets ultra-low-power battery-operated systems - specifically engineered to extend runtime in wearables, medical sensors, and energy-harvesting devices where every nanoamp matters.
FAQ
What is the minimum input voltage required for MAX17220ELT+ to start up?
The MAX17220ELT+ has a typical startup 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 silver-oxide or zinc-air primary cells nearing end-of-life. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics section of the official datasheet.
Does MAX17220ELT+ support true output disconnect during shutdown?
Yes, MAX17220ELT+ implements True Shutdown™, which physically disconnects the output from the input with no forward or reverse current path. Total shutdown current is specified at 0.5nA (IN + LX), and reverse current is blocked across VOUT = 0V to 5V - critical for preserving supercapacitor charge or preventing battery drain in storage mode.
How is the output voltage set on MAX17220ELT+?
The MAX17220ELT+ uses a single 1% resistor (RSEL) connected from the SEL pin to GND to set output voltage from 1.8V to 5.0V in 100mV steps. The device samples RSEL during a ≤600µs detection window at startup - eliminating continuous divider current and enabling one-BOM-part flexibility across multiple voltage requirements.
What package does MAX17220ELT+ use, and is it RoHS-compliant?
MAX17220ELT+ is supplied in a 2mm × 2mm, 6-pin μDFN package (outline 21-0164, land pattern 90-0004, code L622+1C). It is RoHS-compliant and features wettable flanks for reliable solder joint inspection. Thermal resistance θJA is 223.6°C/W on a standard 4-layer PCB - documented in the Package Information section of the datasheet.
Is MAX17220ELT+ pin-compatible with other members of the MAX17220–MAX17225 family?
Yes, all MAX17220–MAX17225 variants - including MAX17220ELT+, MAX17222ELT+, and MAX17224ELT+ - share identical 6-pin μDFN pinout and RSEL-based output configuration. Differences are limited to peak inductor current limit (225mA/500mA/1A) and ETP inclusion (MAX17220/2/4 only), allowing drop-in upgrades without PCB changes.
MAX17220ELT+ 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:
- 225mA (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)
MAX17220ELT+ FAQ
1.How can I place an order for MAX17220ELT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17220ELT+ 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 MAX17220ELT+ reliable?
The price and inventory of MAX17220ELT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17220ELT+ is usually 5 days.
3.What payment methods are accepted for MAX17220ELT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17220ELT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17220ELT+?
MAX17220ELT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17220ELT+ 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 MAX17220ELT+?
For technical support, including MAX17220ELT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17220ELT+ requirements.
6.How does Aetrix verify that MAX17220ELT+ is sourced from the original manufacturer or authorized distributors?
All MAX17220ELT+ 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 MAX17220ELT+ meets industry standards.
7.What is the process for return or replacement of MAX17220ELT+?
All MAX17220ELT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17220ELT+, 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 MAX17220ELT+ part is unused and in its original packaging.
Return procedure for MAX17220ELT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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