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Analog Devices Inc./Maxim Integrated MAX38886ATD+
- Part No.:
- MAX38886ATD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
MAX38886ATD+.pdf
- Description:
- IC BATT MFUNC SUPERCAP 1C 14TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:159
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Product details
Overview
MAX38886ATD+ from Maxim Integrated is a reversible buck-boost charge/discharge regulator for supercapacitor backup systems, supporting 2.5V–5.0V system output, up to 0.5A peak charge current and 2.5A peak discharge current, with ±2% voltage threshold accuracy and 2.5μA ready-state quiescent current. It enables seamless power switchover in portable industrial equipment during main supply loss.
For engineers reviewing the MAX38886ATD+ datasheet, MAX38886ATD+ pinout, MAX38886ATD+ application, or MAX38886ATD+ equivalent, key selection criteria include programmable supercapacitor voltage limits (0.5V–4.5V), system minimum voltage setting, external ISET resistor-based current scaling, and TDFN-14 thermal performance under high-pulse discharge loads.
Technical Context
The MAX38886ATD+ implements a fixed on-time, current-limited pulse-frequency-modulation (PFM) control scheme in boost (backup) mode and synchronous buck regulation in charge mode-both using the same external inductor. Its True Shutdown™ feature fully disconnects SYS from CAP and prevents reverse current when VCAP > VSYS.
It features dual feedback loops: FBS senses system rail voltage to initiate charging above 0.56V and regulate backup down to 0.5V; FBCH senses supercapacitor voltage to halt charging at user-defined thresholds. Internal high-side (80–160mΩ) and low-side (50–100mΩ) FETs support bidirectional energy transfer with 2MHz switching frequency and sub-100ns minimum off-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SYS Voltage Range | 2.5V to 5.0V - defines compatible host system supply rails including Li-ion battery packs and USB-powered rails. |
| CAP Voltage Range | 0.5V to 4.5V - supports wide supercapacitor chemistries (e.g., 2.7V, 3.0V, 3.8V rated) with programmable upper/lower limits. |
| Peak Discharge Current | Up to 2.5A - delivers high-pulse backup power to sustain 3V/200mA loads for ≥1 second from a 2.7V/256mF supercapacitor. |
| Peak Charge Current | Up to 0.5A - charges supercapacitors at controlled rate to avoid overvoltage stress and electrolyte degradation. |
| Ready Quiescent Current | 2.5μA - maintains supercapacitor in standby without significant self-discharge impact over months of storage. |
| Threshold Accuracy | ±2% - ensures precise activation of charge initiation (FBS > 0.56V) and backup cutoff (FBS < 0.5V) across temperature. |
| Switching Frequency | 2MHz - enables use of compact 1μH inductors and reduces output ripple without compromising transient response. |
Pinout & Package
The MAX38886ATD+ is housed in a thermally enhanced 3mm × 3mm × 0.75mm TDFN-EP package with exposed PGND pad for optimal heat dissipation. Junction-to-ambient thermal resistance is 41°C/W on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYS | System supply input/output rail | Connects to removable battery or DC rail (2.5–5V); serves as both input during charge and regulated output during backup. |
| ISET | Charge/discharge current programming | Resistor to GND sets peak discharge current per IDISCHARGE = 2.5A × (20kΩ/RISET); charge current is fixed at 1/5 of discharge value. |
| FBS | System voltage feedback | Senses divided SYS voltage; triggers charging when >0.56V and regulates SYS to programmed minimum (e.g., 3.0V) during backup. |
| FBCH | Supercapacitor voltage feedback | Senses divided CAP voltage; stops charging when VFBCH reaches 0.5V, enforcing precise max VCAP limit (e.g., 2.7V). |
| EN | Enable control input | Logic-high (>660mV) enables regulation; logic-low (<600mV) forces shutdown with <1μA total device current. |
| CAP | Supercapacitor connection node | High-current terminal for supercapacitor anode; handles up to 2.5A pulsed discharge into LX switch node. |
| LX | Inductor switching node | Drives external 1–4.7μH inductor; integrates high-side and low-side FETs with RDS(ON) ≤160mΩ and ≤100mΩ respectively. |
| PGND | Power ground (exposed pad) | Primary return path for high-current charge/discharge paths; must be connected via multiple thermal vias to internal GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Reversible buck-boost topology | Single-inductor architecture eliminates need for separate charge and discharge converters, reducing BOM count and PCB area by >30% vs dual-IC solutions. |
| True Shutdown™ protection | Physically disconnects SYS from CAP during disable or fault, preventing reverse current flow and protecting against SYS short-circuit or VCAP > VSYS conditions. |
| Programmable voltage/current thresholds | All critical thresholds (VCAP max/min, VSYS min, ICHG/IDCHG) set externally via precision resistors-enabling design reuse across multiple supercapacitor voltages and load currents. |
| 2.5μA ready-state current | Maintains supercapacitor at full charge with negligible self-discharge contribution, enabling multi-month shelf life in battery-backed IoT edge nodes. |
| 2MHz fixed-frequency PFM | Ensures predictable EMI profile and fast transient response during sudden load steps in backup mode, while minimizing inductor size and cost. |
Applications
| Handheld Industrial Scanner | Portable Medical Monitor |
|---|---|
|
Use Scenario: Sudden AC power loss during barcode scanning or data upload in factory-floor handheld terminals. IC Role / Device Role / Timing Role: Bidirectional regulator maintaining 3.3V system rail from 2.7V supercapacitor during 500ms–2s brownout. Use Value: Prevents firmware corruption and data loss by sustaining microcontroller, display, and wireless transceiver operation until graceful shutdown completes. |
Use Scenario: Battery removal during patient transport requiring uninterrupted vital-sign monitoring. IC Role / Device Role / Timing Role: Backup power manager delivering regulated 3.0V/200mA for 1.5 seconds from precharged 3.0V/100mF supercapacitor. Use Value: Guarantees continuous ADC sampling, display refresh, and BLE beacon transmission without interruption during hot-swap events. |
| Rugged Tablet with Removable Battery | Smart Meter Data Logger |
|
Use Scenario: Hot-swap of primary Li-ion battery in field-deployed rugged tablet without OS crash or memory corruption. IC Role / Device Role / Timing Role: Seamless switchover IC regulating SYS rail during 100–500ms gap between battery disconnection and reconnection. Use Value: Enables zero-downtime battery replacement in mission-critical mobile computing applications operating in harsh environments. |
Use Scenario: Power outage during AMI meter firmware update or time-sync event requiring nonvolatile memory write completion. IC Role / Device Role / Timing Role: Supercapacitor discharge controller supplying 3.3V/150mA for 800ms to complete flash programming sequence. Use Value: Eliminates risk of bricked devices due to incomplete firmware writes during grid instability or transformer tap changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supercapacitor backup regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX38887ATD+ | Same pinout and function but supports higher 3.0A peak discharge current and extended -40°C to +125°C operation with tighter 1.5% threshold accuracy. | Better suited for high-current backup needs (e.g., 3.3V/500mA loads) and applications requiring enhanced voltage precision under thermal stress. | Select MAX38887ATD+ when discharge current >2.5A or ±1.5% threshold accuracy is mandatory; otherwise MAX38886ATD+ offers optimal cost/performance balance. |
| TPS61094DSKR | Integrates 220nF bypass capacitor and uses different control architecture (adaptive PFM); lacks independent FBS/FBCH programming and True Shutdown™. | Targeted at lower-power applications (<1A discharge); requires additional external components for supercapacitor voltage clamping and SYS isolation. | Choose TPS61094DSKR only for space-constrained designs where integrated bypass suffices and system-level reverse-current protection is handled elsewhere. |
Compared with MAX38887ATD+, the MAX38886ATD+ trades 0.5A peak discharge headroom and 0.5% threshold tolerance for lower unit cost and identical footprint compatibility; versus TPS61094DSKR, it provides superior system-level protection, flexible external programming, and higher sustained backup current without added discrete components.
Availability
MAX38886ATD+ is available at Aetrix Electronics and suitable for handheld industrial equipment, portable medical monitors, and smart meter data loggers requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX38886ATD+ 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 industrial, automotive, and communications applications, emphasizing reliability, integration, and thermal robustness.
The MAX38886ATD+ belongs to Maxim's supercapacitor backup regulator product line, engineered specifically for seamless, high-efficiency power switchover in battery-removable and brownout-prone portable systems.
FAQ
What is the maximum supercapacitor voltage supported by the MAX38886ATD+?
The MAX38886ATD+ supports a programmable supercapacitor voltage range from 0.5V to 4.5V, set externally via resistor divider on FBCH. For example, using RCBOT = 499kΩ and RCTOP = 2.1MΩ achieves a 2.7V maximum VCAP limit with ±2% accuracy across temperature. The device halts charging when VFBCH reaches 0.5V, ensuring precise enforcement of the configured cap voltage ceiling.
How does the MAX38886ATD+ handle system supply loss and recovery?
When VSYS drops below the programmed minimum (e.g., 3.0V), the MAX38886ATD+ automatically switches from buck (charge) to boost (discharge) mode, drawing power from the supercapacitor to maintain regulation. Once VSYS rises above the FBS threshold (e.g., 0.56V × divider ratio), it resumes charging the supercapacitor. This transition occurs without external intervention and is validated down to -40°C.
Can the MAX38886ATD+ operate without an external inductor?
No-the MAX38886ATD+ requires an external 1μH to 4.7μH inductor connected between LX and CAP to perform bidirectional energy transfer. The internal high-side and low-side FETs rely on this inductor for both buck-mode charging and boost-mode discharging; omitting it prevents regulation and may damage the IC due to uncontrolled current flow.
What is the role of the ISET pin on the MAX38886ATD+?
The ISET pin on the MAX38886ATD+ sets the peak inductor discharge current via an external resistor to GND, using IDISCHARGE = 2.5A × (20kΩ/RISET). The corresponding charge current is internally fixed at 1/5 of that value. For instance, a 20kΩ resistor yields 2.5A discharge and 0.5A charge capability-enabling precise current tailoring without changing the IC or layout.
Does the MAX38886ATD+ provide reverse-current protection between SYS and CAP?
Yes-the MAX38886ATD+ incorporates True Shutdown™, which physically disconnects SYS from CAP during disable or fault conditions. This prevents reverse current flow when VCAP exceeds VSYS or during SYS short-circuit events, eliminating the need for external blocking diodes or MOSFETs and improving overall system efficiency and reliability.
MAX38886ATD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Supercapacitor
- Number of Cells:
- 1
- Fault Protection:
- Short Circuit
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
MAX38886ATD+ FAQ
1.How can I place an order for MAX38886ATD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX38886ATD+ 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 MAX38886ATD+ reliable?
The price and inventory of MAX38886ATD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX38886ATD+ is usually 5 days.
3.What payment methods are accepted for MAX38886ATD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX38886ATD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX38886ATD+?
MAX38886ATD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX38886ATD+ 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 MAX38886ATD+?
For technical support, including MAX38886ATD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX38886ATD+ requirements.
6.How does Aetrix verify that MAX38886ATD+ is sourced from the original manufacturer or authorized distributors?
All MAX38886ATD+ 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 MAX38886ATD+ meets industry standards.
7.What is the process for return or replacement of MAX38886ATD+?
All MAX38886ATD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX38886ATD+, 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 MAX38886ATD+ part is unused and in its original packaging.
Return procedure for MAX38886ATD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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