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Analog Devices Inc./Maxim Integrated MAX17220ELT+T
- Part No.:
- MAX17220ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17220ELT+T.pdf
- Description:
- IC REG BOOST ADJ 225MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,693
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Product details
Overview
MAX17220ELT+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 voltage, features 300nA quiescent current into OUT, and integrates 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 MAX17220ELT+T datasheet, MAX17220ELT+T pinout, MAX17220ELT+T application, or MAX17220ELT+T equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (2mm × 2mm μDFN-6), real-world efficiency curves, and two rigorously cross-checked alternative parts - all grounded in the official Analog Devices MAX17220–MAX17225 datasheet Rev 8 (10/21).
Technical Context
The MAX17220ELT+T implements a fixed-on-time, current-limited PFM control scheme with three operational modes: Ultra-Low-Power Mode (ULPM) at <1.49mA load, Low-Power Mode (LPM) up to ~20mA, and High-Power Mode (HPM) in CCM. Its 300ns maximum switch on-time and 225mA peak inductor current limit are tightly coupled to startup reliability down to 0.88V and sustained regulation at 400mV input under light loads.
True Shutdown™ uses internal back-to-back MOSFETs to fully disconnect IN from OUT, eliminating reverse current across VOUT = 0–5V and enabling zero-load leakage below 0.5nA. The RSEL pin reads a single 1% resistor during a 600μs detection window to set output voltage in 100mV steps - avoiding continuous divider current and supporting field-programmable voltage configuration without BOM changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current (OUT) | 300nA typical - enables >10-year shelf life in coin-cell-powered devices with no active discharge path. |
| Shutdown Current | 0.5nA total (IN + LX) - ensures negligible drain during system sleep, critical for energy-harvesting nodes. |
| Input Voltage Range | 400mV to 5.5V - supports direct operation from partially discharged alkaline/zinc-air cells and supercapacitors. |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set by one standard 1% resistor (e.g., open = 1.8V, 133kΩ = 3.0V), eliminating feedback network power loss. |
| Peak Inductor Current Limit | 225mA - matches low-profile 2.2μH inductors for minimal solution size in space-constrained wearables. |
| Startup Input Voltage | 0.88V typical - guarantees reliable cold-start from weak primary cells before load switching. |
| Package | 2mm × 2mm, 6-pin μDFN (L622+1C) - compatible with automated SMT assembly and achieves θJA = 223.6°C/W on 4-layer board. |
Pinout & Package
MAX17220ELT+T is housed in a 2mm × 2mm, 6-pin μDFN package (package code L622+1C, outline 21-0164) with wettable flanks for automated optical inspection. Thermal resistance is 223.6°C/W (junction-to-ambient, 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output node | Connects to 10μF X5R ceramic capacitor; supplies regulated voltage to load; must be decoupled within 2mm of GND pin. |
| 2 (LX) | Switching node | Drives external inductor; carries high di/dt; requires shortest possible trace to minimize EMI and parasitic inductance. |
| 3 (GND) | Power and signal reference | Primary ground return for IN, OUT, SEL; must connect directly to power plane with multiple vias to reduce impedance. |
| 4 (SEL) | Output voltage selection input | Reads single 1% resistor to GND during 600μs startup window; trace capacitance must stay <2pF to avoid misread. |
| 5 (IN) | Input supply node | Accepts 400mV–5.5V; connects to 10μF X5R capacitor; high-impedance path when True Shutdown is active. |
| 6 (EN) | Active-high enable control | Pulled high internally after startup; supports ETP (Enable Transient Protection) to maintain regulation down to 400mV input. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full IN–OUT isolation and zero reverse current across 0–5V VOUT range. |
| Single-resistor output programming | Eliminates continuous divider current loss; supports 1.8V–5.0V in 100mV steps using ±1% resistors (e.g., 133kΩ = 3.0V). |
| Enable Transient Protection (ETP) | Maintains regulation at input voltages as low as 400mV post-startup - critical for primary-cell voltage sag during pulse loads. |
| Ultra-low-power PFM control | Three-mode operation (ULPM/LPM/HPM) with 11.5Hz min switching frequency at no load - maximizes efficiency at microamp loads. |
| Fixed 300ns on-time architecture | Enables predictable startup timing and stable light-load regulation without external compensation components. |
Applications
| Optical Heart-Rate Monitoring (OHRM) | Supercapacitor RTC Backup |
|---|---|
|
Use Scenario: Primary-cell-powered wrist-worn sensor driving green/red/IR LEDs with pulsed 50mA peaks. IC Role / Device Role / Timing Role: Boost converter supplying stable 3.3V to LED driver IC while operating from 0.9–1.5V silver-oxide cell. Use Value: 300nA quiescent current extends battery life beyond 2 years; ETP prevents dropout during LED pulses when cell voltage sags to 400mV. |
Use Scenario: Maintaining 3.3V RTC supply during main power failure using 5.5V/0.1F supercapacitor. IC Role / Device Role / Timing Role: Regulated step-up converter that starts from 400mV supercap voltage and blocks reverse current to preserve charge. Use Value: True Shutdown™ isolates supercap from RTC load during main power presence; 0.5nA shutdown current minimizes self-discharge over months. |
| Tiny Low-Power IoT Sensor Node | Wearable Medical Patch |
|
Use Scenario: Coin-cell-powered environmental sensor (temp/humidity) transmitting BLE packets every 5 minutes. IC Role / Device Role / Timing Role: Supplies 3.0V to BLE SoC and sensor during 15ms transmit burst; sleeps at ULPM between transmissions. Use Value: 11.5Hz min switching frequency and 300nA IQ reduce average current to <1μA, enabling >5-year operation on CR2032. |
Use Scenario: Disposable ECG patch powered by AAA alkaline cell, requiring FDA-grade reliability and 90-day shelf life. IC Role / Device Role / Timing Role: Provides 2.7V to analog front-end and low-power MCU; maintains regulation during electrode impedance shifts. Use Value: 0.88V startup voltage ensures operation even after 3+ years of storage; ±1.5% output accuracy in LPM meets medical signal-chain requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nano-power boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61291DRVR | 350nA IQ, 200mA ILIM, 1.8–5.5V output, WSON-6 package (2mm × 2mm) | Lacks True Shutdown™; exhibits 100nA reverse leakage at VOUT=0V; requires dual-resistor feedback. | Choose for cost-sensitive designs where reverse current blocking is handled externally and 50nA higher IQ is acceptable. |
| Analog Devices MAX17222ELT+T | Same family, 500mA ILIM, identical pinout/package, 300nA IQ, same RSEL interface and ETP capability | Higher peak current supports larger sensors or faster BLE transmission bursts; same PCB layout. | Choose when design requires >225mA peak load current but retains identical footprint, firmware, and bill-of-materials flexibility. |
Compared with TPS61291DRVR, MAX17220ELT+T delivers superior reverse-current blocking and lower system-level leakage; compared with MAX17222ELT+T, it offers tighter inductor sizing and lower EMI for sub-200mA wearable loads - making it optimal for ultra-miniaturized, long-life primary-cell applications.
Availability
MAX17220ELT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and tiny low-power IoT sensors requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX17220ELT+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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and health-tech markets since 1965.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power, space-constrained battery-powered systems - prioritizing nanocurrent operation, single-resistor configurability, and robust startup from depleted primary cells.
FAQ
What is the minimum input voltage required for MAX17220ELT+T to start up?
The MAX17220ELT+T has a typical startup input voltage of 0.88V and is guaranteed to start from 0.95V across temperature. This allows reliable cold-start from weak alkaline, zinc-air, or silver-oxide cells commonly used in wearables and medical patches - a key differentiator versus competitors requiring ≥1.8V startup.
How does MAX17220ELT+T achieve 0.5nA shutdown current?
The MAX17220ELT+T achieves 0.5nA total shutdown current (IN + LX) through True Shutdown™ - an integrated back-to-back MOSFET structure that physically disconnects IN from OUT while clamping leakage paths. This is measured with RL = 3kΩ, VEN = 0V, and TA = +25°C per the official datasheet Electrical Characteristics table.
Can MAX17220ELT+T operate with input voltage higher than output voltage?
Yes - when VIN exceeds VOUT by ~0.2–0.7V (diode drop), the MAX17220ELT+T operates in pass-through mode, clamping VOUT to VIN minus forward voltage. If VIN is closer to the target VOUT (e.g., VOUT_target + 0.7V > VIN > VOUT_target), it functions like a buck converter, improving efficiency in mixed-source systems.
What is the purpose of the SEL pin on MAX17220ELT+T?
The SEL pin on MAX17220ELT+T reads a single 1% resistor to GND during a 600μs window at startup to configure output voltage in 100mV steps (1.8V–5.0V). This eliminates continuous divider current, reduces BOM count, and enables field-voltage reconfiguration - a core feature distinguishing MAX17220ELT+T from traditional feedback-based boost converters.
Is MAX17220ELT+T pin-compatible with other members of the MAX17220–MAX17225 family?
Yes - MAX17220ELT+T shares identical 2mm × 2mm μDFN-6 pinout and footprint with MAX17222ELT+T and MAX17224ELT+T. This allows drop-in replacement for higher-current variants without PCB revision, provided thermal and inductor current limits are verified for the target application load profile.
MAX17220ELT+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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX17220ELT+T FAQ
1.How can I place an order for MAX17220ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17220ELT+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 MAX17220ELT+T reliable?
The price and inventory of MAX17220ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17220ELT+T is usually 5 days.
3.What payment methods are accepted for MAX17220ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17220ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17220ELT+T?
MAX17220ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17220ELT+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 MAX17220ELT+T?
For technical support, including MAX17220ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17220ELT+T requirements.
6.How does Aetrix verify that MAX17220ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX17220ELT+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 MAX17220ELT+T meets industry standards.
7.What is the process for return or replacement of MAX17220ELT+T?
All MAX17220ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17220ELT+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 MAX17220ELT+T part is unused and in its original packaging.
Return procedure for MAX17220ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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