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Analog Devices Inc./Maxim Integrated MAX17225ELT+T
- Part No.:
- MAX17225ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17225ELT+T.pdf
- Description:
- IC REG BOOST ADJ 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
MAX17225ELT+T from Analog Devices is a nanoPower synchronous boost DC-DC converter optimized for ultra-low-quiescent-current battery-powered systems, featuring 1A peak inductor current limit, True Shutdown™ with 0.5nA shutdown current, 400mV minimum operating input voltage, and resistor-selectable 1.8V–5V output. It enables long-life operation in optical heart-rate monitoring LED drivers and supercapacitor-backed RTCs.
For engineers reviewing the MAX17225ELT+T datasheet, MAX17225ELT+T pinout, MAX17225ELT+T application, or MAX17225ELT+T equivalent, key selection criteria include startup voltage (0.88V), post-startup input hold-up down to 400mV with ETP, single 1% RSEL resistor programming, 300nA quiescent supply current into OUT, and μDFN-6 (2mm × 2mm) package compatibility with space-constrained wearables.
Technical Context
The MAX17225ELT+T implements a fixed-on-time, current-limited PFM control scheme with three operational modes-ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM)-automatically selected based on load current. Its 300ns maximum switch on-time and 1A N-channel MOSFET current limit enable efficient light-load regulation and transient response.
True Shutdown™ disconnects OUT from IN with no forward or reverse current path, supported by internal clamping diodes on LX and guaranteed 0.5nA total shutdown current (IN + LX). The device supports VIN > VOUT operation via diode-clamp behavior and includes enable transient protection (ETP) for sustained regulation during input droop to 400mV after startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current into OUT | 300nA typical - minimizes battery drain during sensor sleep states |
| Shutdown Current (IN + LX) | 0.5nA typical - enables multi-year shelf life in sealed medical devices |
| Input Voltage Range | 400mV to 5.5V - supports primary cells (e.g., silver oxide, zinc air) from end-of-life to fresh |
| Output Voltage Range | 1.8V to 5V, 100mV/step - set by single ±1% resistor (RSEL), eliminating feedback divider current loss |
| Peak Inductor Current Limit | 1A - allows use of smaller inductors (e.g., 2.2µH) while delivering >200mA at 3VOUT from 1.5VIN |
| Minimum Startup Voltage | 0.88V typical - ensures reliable cold-start from depleted primary cells |
| Efficiency (Peak) | 95% - sustains high conversion efficiency across 10µA–200mA load range in ULPM/LPM/HPM |
Pinout & Package
MAX17225ELT+T is packaged in a 2mm × 2mm, 6-pin µDFN (Package Code L622+1C) with wettable flanks, compatible with standard reflow and AOI inspection. Thermal resistance θJA = 223.6°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply | Accepts 400mV–5.5V; requires ≥10µF X5R ceramic capacitor to ground for stability and EMI reduction |
| 2 (OUT) | Regulated output | Delivers 1.8V–5V; connects to 10µF output capacitor and load; isolated from IN in True Shutdown |
| 3 (GND) | Power ground | Low-impedance return path; must be short-connected to bottom pad of CIN and COUT for noise control |
| 4 (SEL) | Output voltage select | Reads single ±1% resistor to GND at startup (600µs detection time); no continuous current draw |
| 5 (LX) | Switching node | Drives external inductor; features internal clamp diodes to GND/OUT; RMS current rating ±1A |
| 6 (EN) | Enable input | Active-high; supports push-pull or open-drain GPIO; enables ETP for 400mV input hold-up post-startup |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-input isolation and reverse-current blocking up to 5V |
| Single-resistor output programming | RSEL pin reads ±1% resistor value at startup only - eliminates static feedback current and simplifies BOM |
| Enable Transient Protection (ETP) | Maintains regulation down to 400mV input after startup - prevents brownout shutdown during battery sag |
| Ultra-low-power PFM control | Three auto-switching modes (ULPM/LPM/HPM) with 11.5Hz min switching frequency at light loads |
| High-efficiency nanoPower operation | 95% peak efficiency with 300nA quiescent current into OUT - extends battery life in IoT sensors by years |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Drivers | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
|
Use Scenario: Wearable OHRM sensor using pulsed green LEDs powered from silver-oxide or zinc-air primary cell. IC Role / Device Role / Timing Role: Boost converter supplying stable 3.3V/5V LED drive voltage while operating down to 400mV input during battery depletion. Use Value: Enables >2-year battery life via 300nA quiescent current and ETP-supported operation through deep discharge cycles. |
Use Scenario: Real-time clock or alarm buzzer requiring uninterrupted 3.3V/5V supply during main power loss. IC Role / Device Role / Timing Role: Bidirectional energy manager: charges supercap from main rail, then boosts supercap voltage to regulated output when main fails. Use Value: Maintains RTC accuracy or consistent buzzer tone down to 400mV supercap voltage with zero reverse leakage. |
| Primary-Cell Portable Medical Sensors | Tiny Low-Power IoT Environmental Sensors |
|
Use Scenario: Disposable temperature patch using AAAA silver-oxide cell and MAX30205 sensor. IC Role / Device Role / Timing Role: NanoPower voltage booster enabling 1.8V microcontroller and sensor interface from sub-1V battery. Use Value: Achieves 5+ year shelf life and 12-month runtime via 0.5nA shutdown and 300nA active IQ. |
Use Scenario: Sub-gram soil moisture sensor deployed in remote agriculture nodes. IC Role / Device Role / Timing Role: Power management core converting 0.9–1.6V primary cell output to 3.0V for BLE SoC and ADC. Use Value: Supports 10-year deployment with coin-cell batteries by eliminating feedback resistor losses and minimizing switching losses at µA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ELT+T | 500mA peak inductor current limit; identical pinout, package, and feature set except lower ILIM | Suitable for ≤150mA loads; lower inductor stress and thermal rise at same output voltage | Select when output current requirement is <200mA and smaller inductor size is prioritized |
| Texas Instruments TPS61291DRVR | 400nA IQ, 1.8V–5.5V output, but 600mA ILIM and no ETP; requires dual-resistor feedback | Lacks 400mV post-startup hold-up and True Shutdown reverse-blocking; higher static feedback current | Choose only if RSEL simplicity is not required and ETP is unnecessary for the host system's input profile |
Compared with MAX17222ELT+T and TPS61291DRVR, the MAX17225ELT+T delivers highest output current headroom (1A ILIM) and unique ETP functionality for ultra-deep input droop tolerance - critical for primary-cell wearables where battery voltage collapses rapidly under load.
Availability
MAX17225ELT+T is available at Aetrix Electronics and suitable for optical heart-rate monitors, supercapacitor-backed RTCs, primary-cell medical patches, low-power IoT sensors, and wearable alarm buzzers requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX17225ELT+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 (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial, automotive, and healthcare markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power, space-constrained battery-operated devices - emphasizing nanoamp quiescent current, minimal external components, and robust operation from near-dead primary cells.
FAQ
What is the minimum input voltage required for MAX17225ELT+T to start up?
The MAX17225ELT+T has a typical minimum startup input voltage of 0.88V, guaranteed to 0.95V over temperature. This allows reliable cold-start from nearly depleted silver-oxide or zinc-air primary cells. Once started, it continues regulating down to 400mV input with Enable Transient Protection enabled - a key differentiator for long-life portable systems.
How does the RSEL pin configure the output voltage on MAX17225ELT+T?
The RSEL pin on MAX17225ELT+T reads a single ±1% resistor connected to GND during a 600µs detection window at startup - no continuous current draw. Resistor values from 0Ω (5.0V) to open (1.8V) select 100mV steps across 1.8V–5.0V. For example, a 133kΩ resistor sets 3.0V output per the RSEL Selection Table in the datasheet.
Does MAX17225ELT+T support True Shutdown™, and what is its shutdown current?
Yes, MAX17225ELT+T features True Shutdown™, which fully disconnects the output from the input with no forward or reverse current path. Its total shutdown current (IN + LX) is 0.5nA typical at +25°C - verified in the Electrical Characteristics table - enabling multi-year storage life in sealed medical or industrial sensors.
What package type and dimensions does MAX17225ELT+T use?
MAX17225ELT+T uses a 2mm × 2mm, 6-pin µDFN package (Package Code L622+1C, Outline Number 21-0164) with wettable flanks. It has a 0.5mm pitch and exposed thermal pad. This compact footprint supports high-density layouts in wearables and disposable medical patches where board area is at a premium.
Can MAX17225ELT+T operate with input voltage higher than output voltage?
Yes, MAX17225ELT+T operates in buck-like mode when VIN exceeds VOUT by ~0.2–0.7V (diode drop), clamping VOUT to VIN minus forward voltage. When VIN is between VOUT target and VOUT + VDIODE, it regulates normally. This behavior enables seamless transition during battery recharge or hybrid power-source designs without external diodes.
MAX17225ELT+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:
- 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+T FAQ
1.How can I place an order for MAX17225ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17225ELT+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 MAX17225ELT+T reliable?
The price and inventory of MAX17225ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17225ELT+T is usually 5 days.
3.What payment methods are accepted for MAX17225ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17225ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17225ELT+T?
MAX17225ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17225ELT+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 MAX17225ELT+T?
For technical support, including MAX17225ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17225ELT+T requirements.
6.How does Aetrix verify that MAX17225ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX17225ELT+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 MAX17225ELT+T meets industry standards.
7.What is the process for return or replacement of MAX17225ELT+T?
All MAX17225ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17225ELT+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 MAX17225ELT+T part is unused and in its original packaging.
Return procedure for MAX17225ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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