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Analog Devices Inc./Maxim Integrated MAX17225ALT+T
- Part No.:
- MAX17225ALT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX17225ALT+T.pdf
- Description:
- IC REG BOOST ADJ 1A 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
MAX17225ALT+T from Analog Devices is a nanoPower synchronous boost DC-DC converter with True Shutdown™, 1A peak inductor current limit, 300nA quiescent supply current into OUT, and 1.8V–5V resistor-selectable output voltage. It operates from input voltages as low as 400mV post-startup and supports ultra-low-power wearable and medical sensor systems powered by primary cells or supercapacitors.
For engineers reviewing the MAX17225ALT+T datasheet, MAX17225ALT+T pinout, MAX17225ALT+T application, or MAX17225ALT+T equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases for battery-constrained designs, and validated alternative options for voltage boosting in sub-1µA standby systems.
Technical Context
The MAX17225ALT+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 maximum on-time and 1A peak inductor current limit enable efficient operation across wide input (400mV–5.5V) and output (1.8V–5V) ranges.
True Shutdown™ disconnects OUT from IN with 0.5nA total shutdown current and blocks reverse current over VOUT = 0V to 5V. The device uses a single 1% RSEL resistor for output voltage selection and supports enable transient protection (ETP) to maintain regulation down to 400mV input during active operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current (OUT) | 300nA typical - enables multi-year battery life in always-on IoT sensors |
| Shutdown Current | 0.5nA total into IN/LX - eliminates parasitic drain during system sleep |
| Input Voltage Range | 400mV to 5.5V - supports direct operation from depleted primary cells and supercapacitors |
| Output Voltage Range | 1.8V to 5V, 100mV/step via single 1% RSEL resistor - simplifies BOM and enables field-programmable output |
| Peak Inductor Current Limit | 1A - allows compact 2.2µH inductors while delivering >200mA at 3VOUT from 1.5VIN |
| Efficiency | 95% peak - maintains high conversion efficiency even at 10µA loads due to PFM architecture |
| Startup Input Voltage | 0.88V typical - boots from weak primary cells without external charge pump |
| Package | 2mm × 2mm, 6-pin µDFN - fits in space-constrained wearables and medical patches |
Pinout & Package
MAX17225ALT+T is housed in a 2mm × 2mm, 6-pin µDFN package (package code L622+1C) with wettable flank capability and RoHS-compliant finish.
| 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 suppression |
| 2 (OUT) | Regulated output | Delivers 1.8V–5V; connects to 10µF output capacitor and load; disconnected from IN in True Shutdown |
| 3 (GND) | Power ground | Low-impedance return path; must be tied directly to input/output capacitor grounds with minimal trace length |
| 4 (SEL) | Output voltage select | Reads single 1% resistor to GND during startup; CRSEL < 2pF required for accurate detection within 600µs |
| 5 (LX) | Switching node | Connects inductor between IN and LX; handles 1ARMS switching current; clamped internally to GND and OUT |
| 6 (EN) | Active-high enable | Drives internal startup sequence; MAX17225 supports push-pull GPIO control with no external pullup needed |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with full output-to-input isolation and reverse-current blocking up to 5V |
| Single-resistor output programming | Eliminates feedback divider network - saves board space and removes continuous resistor-divider current loss |
| Enable Transient Protection (ETP) | Maintains regulation down to 400mV input after startup, enabling robust operation during battery voltage sag |
| PFM control with 3-mode auto-switching | ULPM (11.5Hz min frequency), LPM, and HPM adapt dynamically to load - sustains >85% efficiency from 10µA to 200mA |
| Ultra-low start-up voltage | 0.88V typical startup threshold - powers from nearly exhausted silver-oxide or zinc-air cells without auxiliary circuitry |
| Thermal performance | θJA = 223.6°C/W on 4-layer board - supports continuous 1A peak current in compact layouts with minimal heatsinking |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Drivers | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
Use Scenario: Primary-cell-powered wearable monitors using pulsed green LEDs requiring stable 3.3V/5V rail during brief high-current bursts. IC Role / Device Role / Timing Role: Boost converter providing regulated output from 0.8V–1.6V primary cell; enables True Shutdown between measurement cycles. Use Value: 300nA quiescent current extends battery life beyond 2 years; 1A peak current supports 100mA LED pulses without voltage droop. |
Use Scenario: Real-time clock or alarm buzzer powered from supercapacitor charged by energy harvesting or trickle-charge circuit. IC Role / Device Role / Timing Role: Voltage regulator maintaining constant 3.3V/5V output as supercapacitor discharges from 5.5V down to 400mV. Use Value: True Shutdown prevents reverse current leakage into depleted supercapacitor; 400mV operating floor maximizes usable energy. |
| Primary-Cell Portable Systems | Tiny, Low-Power IoT Sensors |
Use Scenario: AAA/AA silver-oxide or alkaline-powered temperature/humidity sensors transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Main power rail generator stepping up 1.2V–1.5V battery voltage to 3.0V for MCU and radio during active transmission. Use Value: 0.88V startup and 300nA IQ allow operation until battery reaches 0.4V - extracting ~20% more capacity than conventional boosters. |
Use Scenario: Coin-cell or button-cell-powered environmental sensor node deployed in remote locations for >10-year maintenance-free operation. IC Role / Device Role / Timing Role: Always-on power management IC supplying regulated voltage to ultra-low-power MCU and analog front-end during deep-sleep and wake cycles. Use Value: ULPM PFM operation at 11.5Hz minimizes switching losses; single RSEL resistor reduces component count and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ALT+T | 500mA peak inductor current limit; identical package, pinout, and RSEL interface | Lower output current capability - suitable for ≤100mA loads where smaller inductor size is prioritized | Select when system peak load is <150mA and solution size optimization outweighs headroom need |
| Texas Instruments TPS61291DRVR | 400nA IQ, 1.8V–5.5V output, but only 600mA ILIM; no True Shutdown - exhibits reverse leakage above 100nA | Lacks output-to-input isolation in shutdown - unsuitable for supercapacitor backup or bidirectional energy storage systems | Consider only for cost-sensitive, non-isolation-critical applications where 600mA peak suffices |
Compared with MAX17225ALT+T, MAX17222ALT+T trades 1A current headroom for marginally lower solution cost, while TPS61291DRVR sacrifices reverse-current blocking and adds 200nA shutdown leakage - making MAX17225ALT+T the sole choice for true zero-drain backup and high-pulse-load wearables.
Availability
MAX17225ALT+T is available at Aetrix Electronics and suitable for optical heart-rate monitoring modules, supercapacitor-backed RTC systems, and primary-cell IoT sensor nodes requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX17225ALT+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 precision instrumentation, industrial automation, healthcare, and communications markets.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power battery-operated systems where nanocurrent operation, minimal solution footprint, and true output isolation are mandatory - targeting wearables, medical sensors, and energy-harvesting edge nodes.
FAQ
What is the minimum input voltage required for MAX17225ALT+T to start up?
The MAX17225ALT+T has a typical startup input voltage of 0.88V and is guaranteed to start from 0.95V across temperature. Once running, it continues operation down to 400mV input depending on load current - enabling full utilization of primary cells like silver-oxide and zinc-air batteries well beyond their nominal discharge endpoints. This behavior is confirmed in the Electrical Characteristics table under "Minimum Startup Input Voltage".
How does True Shutdown™ work in MAX17225ALT+T, and what is its leakage current?
True Shutdown™ in MAX17225ALT+T physically disconnects the output from the input using internal MOSFETs, eliminating forward and reverse current paths. Total shutdown current into IN and LX is specified at 0.5nA typical (max 100nA) at +25°C, with no reverse current flow observed from VOUT = 0V to 5V. This is measured and guaranteed per the "Total Shutdown Current into IN, LX" parameter in the datasheet's Electrical Characteristics section.
Can MAX17225ALT+T be used with a supercapacitor as the input source?
Yes - MAX17225ALT+T is explicitly validated for supercapacitor backup applications, including RTC preservation and alarm buzzer drive. Its 400mV–5.5V input range, True Shutdown reverse-current blocking, and ability to regulate down to 400mV make it ideal for maintaining stable 3.3V or 5V output as the supercapacitor discharges from 5.5V to near-zero. Application Figure 10 and Figure 11 in the datasheet confirm this usage with MAX14575 and DS1341.
What is the purpose of the SEL pin on MAX17225ALT+T, and how is it used?
The SEL pin on MAX17225ALT+T reads a single standard 1% resistor connected to GND during startup (within 600µs) to set the output voltage from 1.8V to 5.0V in 100mV steps - e.g., 133kΩ yields 3.0V. This eliminates traditional feedback dividers, reducing BOM count, PCB area, and standby current loss. The RSEL Selection Table (page 12–13 of datasheet) provides exact resistor values and confirms ±1% accuracy requirement.
Does MAX17225ALT+T support enable transient protection (ETP), and how does it affect quiescent current?
Yes - MAX17225ALT+T (as part of the MAX17224/MAX17225 variant group) includes Enable Transient Protection, allowing continued regulation down to 400mV input after startup. When driven by an open-drain EN with a 33MΩ pullup, ETP adds ~61nA to total system quiescent current (calculated per Figure 1 and Equation on datasheet page 9). This tradeoff enables robust operation during battery voltage sag without requiring external supervision circuitry.
MAX17225ALT+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)
MAX17225ALT+T FAQ
1.How can I place an order for MAX17225ALT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17225ALT+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 MAX17225ALT+T reliable?
The price and inventory of MAX17225ALT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17225ALT+T is usually 5 days.
3.What payment methods are accepted for MAX17225ALT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17225ALT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17225ALT+T?
MAX17225ALT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17225ALT+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 MAX17225ALT+T?
For technical support, including MAX17225ALT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17225ALT+T requirements.
6.How does Aetrix verify that MAX17225ALT+T is sourced from the original manufacturer or authorized distributors?
All MAX17225ALT+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 MAX17225ALT+T meets industry standards.
7.What is the process for return or replacement of MAX17225ALT+T?
All MAX17225ALT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17225ALT+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 MAX17225ALT+T part is unused and in its original packaging.
Return procedure for MAX17225ALT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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