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Analog Devices Inc./Maxim Integrated MAX38650AANT+
- Part No.:
- MAX38650AANT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-XFBGA, WLBGA
- Datasheet:
-
MAX38650AANT+.pdf
- Description:
- IC REG BUCK ADJ 100MA 6WLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,100
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Product details
Overview
MAX38650AANT+ from Maxim Integrated is a nanoPower synchronous buck converter optimized for ultra-low-quiescent-current battery-powered systems. It operates from 1.8V to 5.5V input, delivers up to 100mA output current, achieves 95% peak efficiency, supports 100% duty cycle operation, and features 390nA quiescent current - enabling multi-year operation on coin-cell or single Li-ion batteries in wearable and NB-IoT endpoints.
For engineers reviewing the MAX38650AANT+ datasheet, MAX38650AANT+ pinout, MAX38650AANT+ application, or MAX38650AANT+ equivalent, this page provides verified technical context, validated pin functions, confirmed RSEL-based VOUT configuration range (1.2V–3.3V), real-world load regulation behavior, and manufacturer-validated alternatives for low-power DC-DC selection.
Technical Context
The MAX38650AANT+ employs a proprietary adaptive control scheme that dynamically switches between low-power mode (LPM) and high-power mode (HPM) based on load demand, enabling stable regulation down to 10µA while maintaining ±1.5% output accuracy. Its 100% duty cycle capability allows seamless dropout-free operation as input voltage decays below target VOUT - critical for deep-discharge battery use cases.
It integrates reverse-current blocking during shutdown (5nA shutdown current), active discharge via an internal 85Ω resistor (typical), and UVLO with dual thresholds (1.75V/2.6V rising) selectable by RSEL resistance. The device uses a synchronous rectifier with 325mΩ high-side and 150mΩ low-side MOSFETs, supporting 2.2µH inductors and ceramic CIN/COUT (10µF/22µF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports direct connection to coin cells (e.g., CR2032), single Li-ion (2.7–4.2V), and regulated 3.3V/5V rails without external LDO pre-regulation. |
| Quiescent Current (IQ) | 390nA typical - enables >10-year battery life in always-on BLE sensor nodes drawing 10µA average system current. |
| Output Voltage Range | 1.2V to 3.3V (RSEL-programmable) - configured via single external resistor (e.g., 383kΩ for 1.2V, 56.2kΩ for 3.3V), eliminating feedback divider losses. |
| Peak Efficiency | 95% at 100mA - minimizes thermal rise in sealed wearables; maintains >85% efficiency even at 10µA load due to LPM optimization. |
| Load Current Capability | 100mA continuous - sufficient to power MCU + BLE radio bursts (e.g., Nordic nRF52840 peak 15mA), sensors, and EEPROM. |
| Output Accuracy | ±1.5% over -40°C to +125°C - ensures reliable logic-level compliance for 1.8V/2.5V/3.3V I/O domains across industrial temperature ranges. |
| Shutdown Current | 5nA - reduces standby drain to negligible levels; enables true "zero-power" sleep states in energy-harvesting or wake-on-event designs. |
Pinout & Package
MAX38650AANT+ is housed in a 1.58mm × 0.89mm, 6-pin wafer-level package (WLP) with 0.4mm pitch (package code N60R1+1), optimized for space-constrained PCBs in wearables and medical patches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 IN | Regulator input supply | Accepts 1.8V–5.5V; requires local 10µF ceramic bypass to GND; connects directly to battery or upstream rail. |
| A2 LX | Switching node | Drives external 2.2µH inductor; carries pulsed current up to 310mA peak; must be routed with minimal loop area to reduce EMI. |
| A3 GND | Power ground reference | Primary return path for IN, LX, and OUT currents; requires low-impedance connection to PCB ground plane with multiple vias. |
| B3 RSEL/NC | Output voltage select input | For MAX38650AANT+: connect resistor to GND to set VOUT (1.2V–3.3V) and UVLO threshold; max 2pF pin capacitance required. |
| B2 OUT | Regulated output | Delivers configured VOUT (e.g., 1.8V); connects to load and 22µF ceramic output capacitor; includes active discharge to GND when disabled. |
| B1 EN | Enable control input | Logic-high (>1.2V) enables regulation; logic-low (<0.7V) disables converter and activates reverse-current blocking + active discharge. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables dropout-free regulation when VIN ≤ VOUT + 0.3V - essential for maintaining MCU core voltage during battery decay from 3.0V to 1.8V. |
| RSEL-Based Output Programming | Single resistor sets both VOUT and UVLO threshold - eliminates feedback divider leakage, reduces BOM count, and supports field-configurable voltage variants. |
| Active Discharge | Internal 85Ω resistor pulls OUT to GND within milliseconds of disable - prevents floating outputs and ensures safe reset sequencing in multi-rail systems. |
| Reverse-Current Blocking | Prevents backfeed from OUT to IN during shutdown - protects primary battery from parasitic discharge through downstream loads or failed regulators. |
| Ultra-Low IQ Architecture | 390nA quiescent current achieved via adaptive LPM/HPM switching and startup-limited RSEL sensing - preserves battery capacity in long-idle IoT edge nodes. |
Applications
| Wearable Health Sensors | NB-IoT Asset Trackers |
|---|---|
|
Use Scenario: Continuous ECG/PPG monitoring in wrist-worn patch using CR2032 battery and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Primary power regulator supplying 1.8V to MCU core and analog front-end, operating in LPM >99% of time. Use Value: 390nA IQ extends battery life beyond 3 years; 100% duty cycle sustains regulation as battery drops from 3.0V to 1.9V without brownout. |
Use Scenario: GPS-enabled logistics tag transmitting location every 6 hours via NB-IoT modem powered by Li-SOCl₂ cell. IC Role / Device Role / Timing Role: Step-down regulator delivering 3.3V to modem and microcontroller during brief transmission bursts. Use Value: 95% peak efficiency minimizes heat buildup in sealed enclosure; active discharge ensures clean power-down before sleep mode. |
| BLE Beacon Nodes | Industrial Wireless Sensor Nodes |
|
Use Scenario: iBeacon-compatible proximity sensor using nRF52810, powered by AAA alkaline battery. IC Role / Device Role / Timing Role: NanoPower buck providing stable 2.5V to RF transceiver and accelerometer during advertising intervals. Use Value: RSEL programming allows one BOM item to support 2.5V/3.0V/3.3V beacon variants; ±1.5% accuracy guarantees BLE radio compliance. |
Use Scenario: Temperature/humidity sensor node in factory environment, operating at -40°C to +85°C with 10-year maintenance interval. IC Role / Device Role / Timing Role: Primary DC-DC converter powering 3.3V MCU, LoRa transceiver, and digital sensors from 3.6V lithium-thionyl chloride battery. Use Value: -40°C to +125°C rating ensures reliability in uncontrolled enclosures; reverse-current blocking prevents battery drain during sensor fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nanoPower buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS62840YKAR | 300nA IQ, 200mA output, fixed 1.8V/2.5V/3.3V options only; no RSEL programmability; requires external feedback resistors for adjustable versions. | Lacks RSEL-based field configurability; better suited for high-volume fixed-VOUT designs where BOM simplification outweighs flexibility needs. | Select TPS62840YKAR if fixed output voltage suffices and lowest possible IQ (300nA) is prioritized over programmability. |
| Analog Devices ADP5302ACBZ-1-R7 | 250nA IQ, 150mA output, 1.2V–5.2V adjustable via resistor divider; includes integrated LDO backup; larger 1.6mm × 0.9mm WLCSP package. | Higher IQ overhead from LDO backup path; wider VOUT range but higher minimum load requirement (10µA vs. MAX38650A's 0µA). | Select ADP5302ACBZ-1-R7 if dual-path power architecture (buck + LDO) or extended VOUT range beyond 3.3V is required. |
Compared with TPS62840YKAR and ADP5302ACBZ-1-R7, the MAX38650AANT+ uniquely balances ultra-low IQ (390nA), RSEL-based configurability, and 100% duty cycle operation in the smallest footprint - making it optimal for cost-sensitive, space-constrained, and field-upgradable ultra-low-power designs.
Availability
MAX38650AANT+ is available at Aetrix Electronics and suitable for portable consumer electronics, wearable health monitors, NB-IoT asset trackers, and industrial wireless sensor nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX38650AANT+ 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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX38650 series targets ultra-low-power battery-operated systems - specifically engineered to maximize runtime in space-constrained, always-on endpoints such as wearables, BLE sensors, and cellular IoT devices.
FAQ
What is the output voltage range supported by MAX38650AANT+?
The MAX38650AANT+ supports an RSEL-programmable output voltage range from 1.2V to 3.3V in discrete steps defined by resistor values in Table 1 of the datasheet. Unlike the MAX38650B variant, the MAX38650AANT+ does not have a factory-fixed output - each unit's VOUT is determined at startup by the external RSEL-to-GND resistor, enabling flexible BOM reuse across multiple voltage requirements.
How does MAX38650AANT+ achieve 390nA quiescent current?
The MAX38650AANT+ achieves 390nA quiescent current through a combination of adaptive low-power mode (LPM) operation, startup-limited RSEL sensing (200µA only for ~600µs), and elimination of continuous feedback-divider current. Its proprietary control architecture minimizes gate drive and bias current during light-load conditions, while maintaining regulation stability down to 10µA - a key differentiator versus conventional buck converters.
Does MAX38650AANT+ support 100% duty cycle operation, and why does it matter?
Yes, MAX38650AANT+ supports true 100% duty cycle operation, meaning it can maintain regulation even when input voltage falls to or below the target output voltage (e.g., VIN = 1.8V for VOUT = 1.8V). This prevents brownout during battery discharge in coin-cell or Li-ion applications, eliminating the need for larger batteries or supplemental LDOs - directly extending usable battery capacity and system uptime.
What is the function of the RSEL pin on MAX38650AANT+?
The RSEL pin on MAX38650AANT+ serves a dual function: it configures both the output voltage (1.2V–3.3V) and the input undervoltage lockout (UVLO) rising threshold (1.75V or 2.6V) via a single external resistor to GND. During startup, the MAX38650AANT+ sources ~200µA for ~600µs to read the RSEL value - a method that avoids continuous divider current and enables field-programmable voltage variants using standard 1% resistors.
What package type and dimensions does MAX38650AANT+ use?
MAX38650AANT+ uses a 1.58mm × 0.89mm, 6-pin wafer-level package (WLP) with 0.4mm pitch (package code N60R1+1). This ultra-compact footprint occupies less than 1.4mm² board area - ideal for hearing aids, smart patches, and other miniaturized wearables where PCB real estate is severely constrained.
MAX38650AANT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-XFBGA, WLBGA
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 3.3V
- Current - Output:
- 100mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLP (1.58x0.89)
MAX38650AANT+ FAQ
1.How can I place an order for MAX38650AANT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX38650AANT+ 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 MAX38650AANT+ reliable?
The price and inventory of MAX38650AANT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX38650AANT+ is usually 5 days.
3.What payment methods are accepted for MAX38650AANT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX38650AANT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX38650AANT+?
MAX38650AANT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX38650AANT+ 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 MAX38650AANT+?
For technical support, including MAX38650AANT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX38650AANT+ requirements.
6.How does Aetrix verify that MAX38650AANT+ is sourced from the original manufacturer or authorized distributors?
All MAX38650AANT+ 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 MAX38650AANT+ meets industry standards.
7.What is the process for return or replacement of MAX38650AANT+?
All MAX38650AANT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX38650AANT+, 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 MAX38650AANT+ part is unused and in its original packaging.
Return procedure for MAX38650AANT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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