My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX17221ENT+
- Part No.:
- MAX17221ENT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-XFBGA, WLBGA
- Datasheet:
-
MAX17221ENT+.pdf
- Description:
- IC REG BOOST ADJ 6WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,611
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX17221ENT+ from Analog Devices is a nanoPower synchronous boost DC-DC converter optimized for ultra-low-quiescent-current battery-powered systems, featuring 300nA quiescent supply current into OUT, 225mA peak inductor current limit, True Shutdown™ with 0.5nA shutdown current, and single-resistor-selectable output voltage (1.8V–5V) in a 2mm × 2mm μDFN-6 package. It enables long-life operation in optical heart-rate monitoring LED drivers and supercapacitor-backed RTCs.
For engineers reviewing the MAX17221ENT+ datasheet, MAX17221ENT+ pinout, MAX17221ENT+ application, or MAX17221ENT+ equivalent, key selection considerations include its 400mV minimum operating input voltage, 0.88V startup threshold, post-startup enable transient protection (ETP), 95% peak efficiency, and compatibility with primary-cell and low-voltage secondary-cell power sources.
Technical Context
The MAX17221ENT+ 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 switch on-time and 225mA N-channel MOSFET peak current limit define light-load regulation behavior and inductor sizing constraints.
True Shutdown™ disconnects OUT from IN with no forward or reverse current path, supported by internal clamping diodes on LX and validated leakage specs: 0.3nA LX leakage at 1.5V (25°C), 0.5nA total shutdown current into IN/LX. The RSEL pin enables output voltage configuration via a single ±1% resistor-no feedback divider required-reducing solution size and static current loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Supply Current (OUT) | 300nA typical - enables multi-year battery life in always-on IoT sensors without compromising regulation. |
| Shutdown Current | 0.5nA total into IN/LX - eliminates parasitic drain during system sleep, critical for coin-cell and primary-cell applications. |
| Input Voltage Range | 400mV to 5.5V - supports operation down to near-dead battery states (e.g., 0.4V silver-oxide or zinc-air cells). |
| Startup Input Voltage | 0.88V typical - allows reliable cold-start from weak or partially discharged batteries without external charge pump. |
| Output Voltage Range | 1.8V to 5.0V in 100mV steps - set precisely via single ±1% resistor (e.g., open = 1.8V, 133kΩ = 3.0V, short = 5.0V). |
| Peak Inductor Current Limit | 225mA - defines maximum deliverable output current and constrains inductor selection (e.g., 2.2µH standard value). |
| Efficiency (Peak) | 95% - achieved at medium loads; maintains >85% efficiency down to µA-level loads due to ULPM/HPM transition logic. |
| Package | 2mm × 2mm, 6-pin µDFN (L622+1C) - surface-mount footprint compatible with high-density wearable PCB layouts. |
Pinout & Package
MAX17221ENT+ uses the 2mm × 2mm, 6-pin µDFN package (package code L622+1C, outline 21-0164), optimized for minimal board area and thermal performance (θJA = 223.6°C/W on 4-layer board). Pin assignments are verified per Maxim/Analog Devices functional diagram and pin configuration drawing.
| 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 during True Shutdown™. |
| 3 (GND) | Power Ground | Common reference for all circuitry; must be tied directly to input/output capacitor grounds with minimal trace length. |
| 4 (SEL) | Output Voltage Select | Reads single ±1% resistor to GND at startup (600µs detection time); no continuous current draw in regulation. |
| 5 (LX) | Switching Node | Connects inductor between IN and LX; carries pulsed current up to 225mA peak; requires tight layout to minimize EMI. |
| 6 (EN) | Enable Input | Active-high logic input; MAX17221 variant supports direct push-pull GPIO drive (VIH = 600–900mV, VIL = 150–500mV). |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | 0.5nA total shutdown current with complete output-to-input isolation - prevents battery drain and reverse current flow even when VOUT = 0V. |
| Single-Resistor Output Selection | RSEL pin reads ±1% resistor value at startup only - eliminates feedback divider losses and reduces BOM count vs. dual-resistor solutions. |
| Enable Transient Protection (ETP) | Validated for MAX17221 - maintains regulation down to 400mV input after startup, enabling robust operation during battery voltage sag. |
| PFM Control with Mode Switching | Automatically transitions between ULPM (11.5Hz min frequency), LPM, and HPM based on load - sustains >85% efficiency from 1µA to 100mA output. |
| Ultra-Low Startup Voltage | 0.88V typical startup threshold - enables use with aging primary cells (e.g., AAA/AA silver-oxide) where voltage drops below 1V. |
| Integrated Synchronous Rectification | N-channel + P-channel MOSFETs with RDS(ON) of 124mΩ/300mΩ (N/P) at 3.3V - eliminates external Schottky loss and improves light-load efficiency. |
Applications
| Optical Heart-Rate Monitoring (OHRM) LED Drivers | Supercapacitor Backup for RTC/Alarm Buzzers |
|---|---|
|
Use Scenario: Wearable OHRM sensor using green/red LEDs powered from a single silver-oxide or zinc-air cell (0.8–1.6V). IC Role / Device Role / Timing Role: Boost converter providing stable 3.3V or 5V to drive high-current LED pulses while maintaining <300nA quiescent draw between measurements. Use Value: Extends battery life beyond 2 years by eliminating feedback resistor current and enabling operation down to 0.4V input. |
Use Scenario: Real-time clock or alarm buzzer requiring uninterrupted 3.3V/5V supply during main power failure, backed by supercapacitor. IC Role / Device Role / Timing Role: Regulated boost stage that starts from supercapacitor voltages as low as 400mV and maintains precise output until cap depletes. Use Value: Enables >10-year RTC backup with single supercapacitor; True Shutdown™ prevents reverse discharge into depleted cap. |
| Primary-Cell Portable Systems | Tiny, Low-Power IoT Sensors |
|
Use Scenario: Wireless temperature/humidity sensor powered by AAA alkaline or lithium primary cell, transmitting data every 5 minutes. IC Role / Device Role / Timing Role: Primary power management IC converting decaying 1.5V–0.8V cell voltage to regulated 3.0V for MCU and radio. Use Value: Recovers usable energy down to 0.4V input - adds ~15% extra runtime vs. conventional boosters with 0.9V cutoff. |
Use Scenario: Sub-mm³ environmental sensor node (e.g., soil moisture, air quality) powered by button cell, operating for >5 years. IC Role / Device Role / Timing Role: NanoPower voltage booster supplying 1.8V to ultra-low-power MCU and analog front-end during brief active cycles. Use Value: 300nA quiescent current ensures <1% annual battery loss in sleep mode; RSEL simplifies firmware-agnostic hardware reuse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61291DRVR | 350nA IQ, 200mA ILIM, 0.7V startup, WSON-6 (2mm × 2mm) - lacks True Shutdown™ (100nA shutdown current), no ETP. | Lower peak current limit; less suitable for high-pulse LED loads; requires external feedback resistors. | Choose for cost-sensitive designs where 0.5nA shutdown and ETP are noncritical. |
| LTC3525EDC-3.3#TRMPBF | 20µA IQ, 400mA ILIM, 0.5V startup, 2mm × 2mm DFN-6 - higher quiescent current, no RSEL, fixed 3.3V output. | Not viable for multi-voltage platforms; unsuitable for >10-year battery life; better for moderate-power burst applications. | Choose only if fixed 3.3V output and higher current capability outweigh nanoPower requirements. |
Compared with TPS61291DRVR and LTC3525EDC-3.3#TRMPBF, the MAX17221ENT+ uniquely delivers sub-1nA system-level shutdown current, post-startup ETP for voltage-sag resilience, and resistor-programmable output - making it the only option qualified for decade-long primary-cell deployments with dynamic load profiles.
Availability
MAX17221ENT+ is available at Aetrix Electronics and suitable for optical heart-rate monitoring wearables, supercapacitor-backed RTC modules, primary-cell IoT sensors, and low-power medical devices requiring stable component supply across extended production lifecycles.
Supply support for MAX17221ENT+ 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion solutions.
The MAX17220–MAX17225 family was designed specifically for ultra-low-power, small-footprint boost conversion in battery-constrained applications - emphasizing nanoamp quiescent operation, true output isolation, and simplified voltage configuration without sacrificing efficiency or reliability.
FAQ
What is the minimum input voltage required for MAX17221ENT+ to start up?
The MAX17221ENT+ has a typical startup input voltage of 0.88V, guaranteed to 0.95V over temperature. This allows reliable cold-start from nearly depleted primary cells such as silver-oxide or zinc-air batteries. Once started, it continues operating down to 400mV input depending on load current - a key advantage over conventional boost converters with higher startup thresholds.
How does the RSEL pin on MAX17221ENT+ configure output voltage without continuous current draw?
The RSEL pin on MAX17221ENT+ samples the connected resistor only during a brief 600µs detection window at startup, drawing up to 200µA temporarily. After configuration, no current flows through the resistor - eliminating static power loss. This enables true nanoPower operation and allows one BOM item to serve multiple output voltages (1.8V–5.0V) via simple resistor changes.
Does MAX17221ENT+ support true output disconnection during shutdown, and what is the leakage specification?
Yes, MAX17221ENT+ features True Shutdown™, which physically disconnects OUT from IN with no forward or reverse current path. Total shutdown current into IN and LX is specified at 0.5nA (typ) at +25°C, and LX leakage is 0.3nA at 1.5V. This ensures negligible battery drain in storage or deep-sleep modes - critical for 10+ year primary-cell applications.
What is the peak inductor current limit for MAX17221ENT+, and how does it affect inductor selection?
The MAX17221ENT+ has a guaranteed 225mA peak inductor current limit (180–270mA over temperature). This defines the upper bound for inductor saturation current and influences ripple and efficiency. A standard 2.2µH inductor is recommended for most applications; smaller values (e.g., 1µH) improve size at light loads, while larger values (≤4.7µH) support higher output current in CCM.
Is MAX17221ENT+ compatible with push-pull microcontroller GPIOs on the EN pin?
Yes - unlike MAX17220/MAX17222/MAX17224, the MAX17221ENT+ variant supports direct connection to push-pull GPIOs on the EN pin. Its enable threshold is VIH = 600–900mV and VIL = 150–500mV across temperature, allowing clean logic-level control without external pull-up resistors or additional circuitry - simplifying system design and reducing total shutdown current.
MAX17221ENT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-XFBGA, WLBGA
- 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):
- 1.5V
- Voltage - Output (Max):
- 5V
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLP (1.42x0.89)
MAX17221ENT+ FAQ
1.How can I place an order for MAX17221ENT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17221ENT+ 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 MAX17221ENT+ reliable?
The price and inventory of MAX17221ENT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17221ENT+ is usually 5 days.
3.What payment methods are accepted for MAX17221ENT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17221ENT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17221ENT+?
MAX17221ENT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17221ENT+ 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 MAX17221ENT+?
For technical support, including MAX17221ENT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17221ENT+ requirements.
6.How does Aetrix verify that MAX17221ENT+ is sourced from the original manufacturer or authorized distributors?
All MAX17221ENT+ 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 MAX17221ENT+ meets industry standards.
7.What is the process for return or replacement of MAX17221ENT+?
All MAX17221ENT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17221ENT+, 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 MAX17221ENT+ part is unused and in its original packaging.
Return procedure for MAX17221ENT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX17221ENT+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
