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Analog Devices Inc./Maxim Integrated MAX17225ELT+
- Part No.:
- MAX17225ELT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17225ELT+.pdf
- Description:
- IC REG BOOST ADJ 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
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Product details
Overview
The MAX17225ELT+ from Analog Devices is a nanoPower synchronous boost DC-DC converter with 1A peak inductor current limit, True Shutdown™ (0.5nA shutdown current), and single-resistor-selectable output voltage (1.8V–5.0V). It operates from 400mV input down to startup at 0.88V, delivers up to 95% peak efficiency, and targets ultra-low-power battery systems such as optical heart-rate monitors and supercapacitor-backed RTCs.
For engineers reviewing the MAX17225ELT+ datasheet, MAX17225ELT+ pinout, MAX17225ELT+ application, or MAX17225ELT+ equivalent, key selection criteria include its 1A current limit variant, 2mm × 2mm μDFN-6 package, 300nA quiescent supply current into OUT, and enable transient protection (ETP) for stable operation during input voltage sag to 400mV post-startup.
Technical Context
The MAX17225ELT+ implements a fixed-on-time, current-limited PFM control scheme with 300ns maximum switch on-time and 1A N-channel MOSFET peak current limit. It supports three operating modes-ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM)-automatically transitioning based on load current to maintain regulation across 11.5Hz–2.5MHz switching frequency range.
True Shutdown disconnects OUT from IN with no forward or reverse current flow; LX leakage is ≤400nA at 125°C, and RSEL detection occurs within 600μs using ≤200μA. The device bootstraps from its output to sustain operation below 1V input, enabling use with primary cells (e.g., silver oxide, zinc air) and supercapacitors discharging to 400mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 400mV to 5.5V - enables direct operation from near-dead primary cells and supercapacitors. |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set by single ±1% resistor (RSEL), eliminating feedback divider current loss. |
| Peak Inductor Current Limit | 1A - supports higher output power and larger inductors for improved efficiency under medium-to-heavy loads. |
| Quiescent Supply Current (OUT) | 300nA typical - minimizes battery drain during sensor sleep cycles in wearable medical devices. |
| Shutdown Current | 0.5nA total (IN + LX) - ensures negligible system leakage when disabled, critical for multi-year battery life. |
| Startup Input Voltage | 0.88V typical - allows reliable cold-start from weak energy sources without external bias. |
| Package | 2mm × 2mm, 6-pin μDFN - provides compact footprint and thermal performance (θJA = 223.6°C/W). |
Pinout & Package
MAX17225ELT+ is packaged in a 2mm × 2mm, 6-pin μDFN (package code L622+1C) with exposed pad for thermal dissipation. Pinout follows standard layout: Pin 1 = OUT, Pin 2 = LX, Pin 3 = GND, Pin 4 = SEL, Pin 5 = IN, Pin 6 = EN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Regulated output node | Connects to 10μF X5R ceramic capacitor; supplies regulated voltage to load (e.g., BLE radio, OHRM LED driver). |
| LX | Switching node | Drives external inductor; internal N-channel switch with 31mΩ RDS(ON); requires short, low-inductance PCB trace. |
| GND | Power and signal reference | Must be connected to low-impedance ground plane; shared return path for IN, OUT, and SEL capacitors. |
| SEL | Output voltage selection input | Reads single 1% resistor to set VOUT; detection completes in ≤600μs with <2pF parasitic capacitance. |
| IN | Input power source | Accepts 400mV–5.5V; connects to 10μF input capacitor; supports primary/secondary batteries and supercapacitors. |
| EN | Active-high enable control | Enables ETP functionality; must be pulled high via ≥33MΩ resistor for 400mV input hold-up post-startup. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with complete input-output isolation and reverse-current blocking up to 5V. |
| Single-Resistor Output Selection | RSEL pin reads ±1% resistor to configure 1.8V–5.0V output - eliminates feedback divider current and reduces BOM count. |
| Enable Transient Protection (ETP) | Maintains regulation with input voltage as low as 400mV after startup - prevents brownout-induced reset in primary-cell wearables. |
| NanoPower Quiescent Operation | 300nA IQ into OUT enables >10-year battery life in intermittent-sensing IoT nodes (e.g., temperature loggers). |
| Ultra-Low Startup Voltage | 0.88V typical startup enables direct use with aging alkaline, silver oxide, or discharged supercapacitors. |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Driver | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
Use Scenario: Primary-cell wearable monitors heart rate using pulsed green LEDs requiring stable 3.3V/5V supply. IC Role / Device Role / Timing Role: Boost converter supplies regulated voltage to OHRM LEDs while operating from 0.8–1.6V silver oxide cell. Use Value: 1A current limit supports high-brightness LED pulses; ETP sustains output during cell voltage sag between pulses. | Use Scenario: Real-time clock or alarm buzzer retains function during main power failure using supercapacitor energy store. IC Role / Device Role / Timing Role: Regulates 3.3V/5V output from supercapacitor discharging from 5.5V down to 400mV. Use Value: True Shutdown blocks reverse current into depleted supercapacitor; 0.5nA shutdown current preserves stored charge for months. |
| Primary-Cell Portable Systems | Tiny, Low-Power IoT Sensors |
Use Scenario: AAA/AA-powered environmental sensor node transmits data intermittently via BLE or LoRa. IC Role / Device Role / Timing Role: Powers microcontroller and radio from single 1.5V alkaline cell; starts at 0.88V and runs down to 400mV. Use Value: 300nA quiescent current extends battery life beyond 5 years in 10-second wake-up intervals. | Use Scenario: Coin-cell-powered temperature/humidity sensor logs data every 60 seconds and transmits hourly. IC Role / Device Role / Timing Role: Supplies 3.0V to ultra-low-power MCU and sensor IC from CR2032 (2.0–3.0V range). Use Value: Single RSEL resistor simplifies design reuse across multiple sensor variants; μDFN-6 fits sub-10mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17224ELT+ | Same 1A peak current limit, identical μDFN-6 package and pinout, but lacks Enable Transient Protection (ETP). | Not suitable where input voltage may sag below 0.95V post-startup (e.g., primary-cell OHRM). | Select MAX17224ELT+ only if ETP is unnecessary and lowest possible system IQ is required (no ETP current penalty). |
| TPS61291DRVR | 1.2A peak current, 350nA IQ, but requires dual-resistor feedback and has 600mV minimum input - no 400mV operation. | Cannot replace MAX17225ELT+ in supercapacitor backup or sub-0.95V primary-cell designs. | Choose TPS61291DRVR only for higher-current secondary-cell applications where 600mV+ input is guaranteed. |
Compared with MAX17224ELT+, the MAX17225ELT+ adds ETP for robustness in voltage-sag-prone primary-cell systems; compared with TPS61291DRVR, it enables deeper discharge utilization and eliminates feedback resistor current loss via RSEL architecture.
Availability
MAX17225ELT+ is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor backup power, and primary-cell portable systems requiring stable component supply over extended production lifecycles.
Supply support for MAX17225ELT+ 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power battery-operated applications demanding nanocurrent operation, minimal solution size, and reliable startup from near-dead energy sources.
FAQ
What is the minimum input voltage required for MAX17225ELT+ to start up?
The MAX17225ELT+ has a typical startup input voltage of 0.88V and is guaranteed to start from 0.95V across temperature. It continues operating down to 400mV input post-startup when enabled with ETP, making it ideal for deeply discharged primary cells and supercapacitors. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics section of the datasheet.
How does the RSEL pin configure the output voltage on MAX17225ELT+?
The RSEL pin on MAX17225ELT+ reads a single ±1% resistor connected to GND to set the output voltage from 1.8V to 5.0V in 100mV steps - for example, 133kΩ yields 3.0V. Detection occurs within 600μs at startup using ≤200μA, eliminating continuous divider current and enabling one-BOM flexibility across multiple voltage requirements.
Does MAX17225ELT+ support True Shutdown™, and what is its shutdown current?
Yes, MAX17225ELT+ features True Shutdown™, which fully disconnects the output from the input with no forward or reverse current flow. Its total shutdown current (IN + LX) is 0.5nA typical at +25°C, verified in the Electrical Characteristics table. This enables multi-year battery life in always-off states for medical and IoT edge devices.
What package type and dimensions does MAX17225ELT+ use?
MAX17225ELT+ uses a 2mm × 2mm, 6-pin μDFN package (outline number 21-0164, land pattern 90-0004) with exposed thermal pad. It is RoHS-compliant and optimized for low thermal resistance (θJA = 223.6°C/W on four-layer board), supporting high-density wearable and sensor PCB layouts.
Is Enable Transient Protection (ETP) active on MAX17225ELT+, and how does it affect system design?
Yes, MAX17225ELT+ includes ETP, allowing sustained regulation even when input voltage drops to 400mV post-startup - critical for primary-cell wearables experiencing pulse-load sag. To activate ETP, EN must be pulled high via ≥33MΩ resistor; this adds ~61nA ETP current, detailed in the Detailed Description section.
MAX17225ELT+ 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:
- 1A (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)
MAX17225ELT+ FAQ
1.How can I place an order for MAX17225ELT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17225ELT+ 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 MAX17225ELT+ reliable?
The price and inventory of MAX17225ELT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17225ELT+ is usually 5 days.
3.What payment methods are accepted for MAX17225ELT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17225ELT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17225ELT+?
MAX17225ELT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17225ELT+ 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 MAX17225ELT+?
For technical support, including MAX17225ELT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17225ELT+ requirements.
6.How does Aetrix verify that MAX17225ELT+ is sourced from the original manufacturer or authorized distributors?
All MAX17225ELT+ 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 MAX17225ELT+ meets industry standards.
7.What is the process for return or replacement of MAX17225ELT+?
All MAX17225ELT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17225ELT+, 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 MAX17225ELT+ part is unused and in its original packaging.
Return procedure for MAX17225ELT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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