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Analog Devices Inc./Maxim Integrated MAX17224ALT+T
- Part No.:
- MAX17224ALT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17224ALT+T.pdf
- Description:
- IC REG BOOST ADJ 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
The MAX17224ALT+T from Analog Devices is a nanoPower synchronous boost DC-DC converter with 1A peak inductor current limit, True Shutdown™, and single-resistor-selectable output voltage (1.8V–5V). It operates from input voltages as low as 400mV post-startup and delivers up to 95% peak efficiency-enabling ultra-long battery life in optical heart-rate monitoring (OHRM) LED drivers and supercapacitor backup for RTCs.
For engineers reviewing the MAX17224ALT+T datasheet, MAX17224ALT+T pinout, MAX17224ALT+T application, or MAX17224ALT+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, package-specific thermal resistance data, and two rigorously cross-checked alternative parts for low-power portable systems.
Technical Context
The MAX17224ALT+T implements a fixed-on-time, current-limited PFM control scheme with automatic mode switching between ultra-low-power mode (ULPM), low-power mode (LPM), and high-power mode (HPM) based on load current. Its 300ns minimum on-time and 70–75% maximum duty cycle enable stable regulation down to 400mV input under light loads.
True Shutdown™ disconnects OUT from IN with ≤0.5nA total shutdown current and blocks reverse current across VOUT = 0V–5V. The device supports enable transient protection (ETP), maintaining regulation during input dips to 400mV after startup-enabled only in MAX17220/MAX17222/MAX17224 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current into OUT | 300nA typical at +25°C - enables multi-year operation on coin cells without measurable battery drain during standby. |
| Input Voltage Range | 400mV to 5.5V - supports direct operation from partially discharged primary cells (e.g., AAA/AA alkaline, silver oxide) and supercapacitors. |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set by single ±1% resistor (e.g., open = 1.8V, 133kΩ = 3.0V), eliminating feedback divider current loss. |
| Peak Inductor Current Limit | 0.8A–1.2A - optimized for 2.2μH inductors in compact wearable designs; higher than MAX17222 (0.5A) for increased output current capability. |
| Startup Input Voltage | 0.88V typical - allows cold-start from single-cell batteries at end-of-life or low-temperature conditions. |
| True Shutdown Current | 0.5nA total (IN + LX) - ensures zero-load system current remains sub-1nA when EN = 0V, critical for RTC backup applications. |
| Package Thermal Resistance θJA | 223.6°C/W (μDFN, 4-layer board) - defines maximum power dissipation (357.8mW at +70°C) for thermal design in space-constrained wearables. |
Pinout & Package
MAX17224ALT+T is supplied in a 2mm × 2mm, 6-pin μDFN package (package code L622+1C, outline 21-0164) with wettable flanks for automated optical inspection.
| 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 pin per layout guidelines. |
| 2 (LX) | Switching node | Drives external inductor; carries high di/dt; requires shortest possible trace to minimize EMI and voltage spikes (clamped internally to GND/OUT). |
| 3 (GND) | Power and signal reference | Primary ground return path; must connect directly to input/output capacitor grounds with minimal impedance (<10mΩ target). |
| 4 (SEL) | Output voltage selection input | Reads single 1% resistor to GND during 600μs startup window; capacitance >2pF causes detection failure; keep trace <5mm and unshielded. |
| 5 (IN) | Input supply node | Accepts 400mV–5.5V; connects to 10μF X5R capacitor; high-impedance input during True Shutdown prevents reverse leakage. |
| 6 (EN) | Active-high enable | Pulled high via 33MΩ resistor for ETP operation; open-drain GPIO compatible; threshold 250–900mV depending on temperature. |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-input isolation and reverse-current blocking from 0V to 5V VOUT. |
| Enable Transient Protection (ETP) | Maintains regulation during input voltage dips to 400mV after startup-critical for battery voltage sag during sensor bursts in wearables. |
| Single Resistor Output Selection (RSEL) | Eliminates feedback divider current loss and reduces BOM count; supports 33 standard output voltages from one footprint. |
| Ultra-Low-Power Mode (ULPM) | 11.5Hz minimum switching frequency at 1.49mA transition point-delivers <1μA system quiescent current in standby. |
| PFM Control with Fixed On-Time | 300ns minimum on-time and 75% max duty cycle enable stable operation at ultra-low VIN while preserving efficiency above 90%. |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Drivers | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
Use Scenario: Wearable OHRM sensors using pulsed green LEDs require stable 3.3V–5V supply from 0.8–1.6V primary cells (e.g., AAA, silver oxide) during brief high-current LED bursts. IC Role / Device Role / Timing Role: Boost converter providing regulated output with ETP to sustain LED drive despite battery voltage sag during pulse. Use Value: Enables >2-year battery life with 100% uptime during optical sensing; eliminates need for larger batteries or complex charge-pump alternatives. |
Use Scenario: Real-time clock (RTC) or alarm buzzer powered from supercapacitor charged by main battery; must maintain 3.3V/5V output as supercap voltage drops from 5.5V to 400mV. IC Role / Device Role / Timing Role: Ultra-low-IQ boost regulator with True Shutdown, preventing supercap self-discharge while preserving output regulation down to 400mV. Use Value: Extends RTC backup time beyond 7 days; eliminates reverse-current path that would otherwise discharge supercap through load. |
| Primary-Cell Portable Systems | Tiny, Low-Power IoT Sensors |
Use Scenario: Temperature/humidity sensors powered by single alkaline or zinc-air cells (0.9–1.6V); require 3.3V for MCU and radio during periodic BLE transmissions. IC Role / Device Role / Timing Role: NanoPower boost converter enabling direct operation from fresh-to-dead primary cells without intermediate storage or LDOs. Use Value: Reduces bill-of-materials by removing buck-boost ICs; achieves >10-year shelf life due to 300nA quiescent current into OUT. |
Use Scenario: Sub-mm³ environmental sensors in asset trackers or smart packaging; operate intermittently with microsecond wake-ups and nanosecond-level timing precision. IC Role / Device Role / Timing Role: Power management IC delivering fast, jitter-free voltage ramp-up (1.5ms soft-start) and precise output accuracy (±1.5% in LPM). Use Value: Guarantees reliable MCU boot within 2ms of wake-up; avoids brown-out resets during rapid transitions from deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ALT+T | 500mA peak inductor current limit (vs. 1A); identical package, pinout, and RSEL interface. | Lower output current capability limits use to <100mA loads; unsuitable for high-brightness OHRM LEDs or buzzer drivers. | Select MAX17222ALT+T only when load current stays below 80mA and solution size must match MAX17224ALT+T footprint. |
| TPS61291DRVR | 2.5μA quiescent current (vs. 300nA); 1.8V–5.5V output; no True Shutdown or ETP; 2mm × 2mm WSON-6 package. | Lacks reverse-current blocking and sub-1nA shutdown-unsuitable for supercapacitor backup or multi-year coin-cell applications. | Choose TPS61291DRVR only if higher IQ is acceptable and system already includes external reverse-blocking FET or discrete shutdown control. |
Compared with MAX17222ALT+T and TPS61291DRVR, the MAX17224ALT+T uniquely combines 1A current capability, 300nA IQ, True Shutdown, and ETP in a 2mm × 2mm μDFN-making it the sole option for high-current, ultra-low-power wearable and medical backup systems requiring guaranteed 400mV operation.
Availability
MAX17224ALT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring, supercapacitor RTC backup, and primary-cell IoT sensor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17224ALT+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 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 portable electronics-prioritizing nanoamp quiescent current, minimal solution size, and robust operation from near-dead batteries in wearables and medical devices.
FAQ
What is the minimum input voltage required for MAX17224ALT+T to start up?
The MAX17224ALT+T has a typical startup input voltage of 0.88V at +25°C, guaranteed to 0.95V over temperature. This allows cold-start from nearly depleted primary cells. Once running, it continues regulating down to 400mV input-provided load current remains within ETP limits. The startup voltage is measured with RL ≥ 3kΩ and the typical operating circuit.
How does True Shutdown™ work in MAX17224ALT+T, and what is its leakage performance?
True Shutdown™ in the MAX17224ALT+T physically disconnects the output from the input using internal switches, blocking both forward and reverse current. Total shutdown current into IN and LX is specified at 0.5nA typical at +25°C, with no dependence on output voltage (0V–5V). This ensures supercapacitor backup systems retain charge for weeks without degradation.
Can MAX17224ALT+T be used with a 1μH inductor, and what are the trade-offs?
Yes, the MAX17224ALT+T supports 1μH inductors-recommended for low-input-voltage applications (e.g., <1.2V). However, 1μH increases peak inductor current and ripple, reducing efficiency by ~2–3% versus 2.2μH. The datasheet explicitly advises against values <1μH or >4.7μH; 2.2μH remains optimal for most wearable designs balancing size, efficiency, and output current.
What is the purpose of the SEL pin on MAX17224ALT+T, and how accurate must the resistor be?
The SEL pin on MAX17224ALT+T reads a single external resistor to GND during a 600μs startup window to determine output voltage (1.8V–5.0V in 100mV steps). The resistor must be ±1% tolerance-tighter accuracy ensures output regulation stays within ±1.5% in LPM. Using a 5% resistor risks >50mV output error and potential system instability in precision-sensor applications.
Does MAX17224ALT+T support operation when input voltage exceeds output voltage?
Yes-when VIN exceeds VOUT by ~0.2–0.7V (diode drop), the MAX17224ALT+T clamps VOUT to VIN minus the internal rectifier drop. If VIN is within VOUT target ±0.7V, it operates in buck-like mode with reduced switching activity. This behavior is inherent to its synchronous rectifier architecture and requires no external components or configuration changes.
MAX17224ALT+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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (2x2)
MAX17224ALT+T FAQ
1.How can I place an order for MAX17224ALT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17224ALT+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 MAX17224ALT+T reliable?
The price and inventory of MAX17224ALT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17224ALT+T is usually 5 days.
3.What payment methods are accepted for MAX17224ALT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17224ALT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17224ALT+T?
MAX17224ALT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17224ALT+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 MAX17224ALT+T?
For technical support, including MAX17224ALT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17224ALT+T requirements.
6.How does Aetrix verify that MAX17224ALT+T is sourced from the original manufacturer or authorized distributors?
All MAX17224ALT+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 MAX17224ALT+T meets industry standards.
7.What is the process for return or replacement of MAX17224ALT+T?
All MAX17224ALT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17224ALT+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 MAX17224ALT+T part is unused and in its original packaging.
Return procedure for MAX17224ALT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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