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Analog Devices Inc./Maxim Integrated MAX38886ATD+T
- Part No.:
- MAX38886ATD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
MAX38886ATD+T.pdf
- Description:
- IC REG
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
MAX38886ATD+T 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+T datasheet, MAX38886ATD+T pinout, MAX38886ATD+T application, or MAX38886ATD+T equivalent, key selection criteria include programmable supercapacitor voltage limits (0.5V–4.5V), system minimum voltage setting, external ISET resistor-based current control, and TDFN-14 thermal performance with exposed PGND pad.
Technical Context
The MAX38886ATD+T implements a fixed on-time, current-limited pulse-frequency-modulation (PFM) control scheme in boost (backup) mode and synchronous buck operation in charge mode, using a single inductor for bidirectional energy transfer. Its True Shutdown™ feature fully disconnects SYS from CAP and prevents reverse current when VCAP > VSYS or during SYS short events.
It features dual feedback loops: FBS regulates minimum system voltage (0.5V reference × [1 + RSTOP/RSBOT]), while FBCH sets maximum supercapacitor voltage (0.5V reference × [1 + RCTOP/RCBOT]). Threshold accuracy is ±2%, and zero-crossing detection (IZXP/IZXN) ensures smooth mode transitions without shoot-through.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SYS Voltage Range | 2.5V to 5.0V - defines compatible host supply rails including Li-ion batteries and USB-powered systems. |
| CAP Voltage Range | 0.5V to 4.5V - supports common supercapacitors (e.g., 2.7V or 3.0V rated) with programmable upper/lower limits. |
| LX Peak Discharge Current | Up to 2.5A - enables high-current backup for short-duration system hold-up (e.g., 200mA load for ≥1s with 256mF cap). |
| LX Peak Charge Current | Up to 0.5A - provides controlled charging to avoid overstressing supercapacitor ESR or electrolyte. |
| Ready Quiescent Current | 2.5μA - maintains supercapacitor at target voltage with negligible standby drain during long idle periods. |
| Switching Frequency | 2MHz - allows use of compact 1μH inductors and reduces solution footprint vs. lower-frequency alternatives. |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive-adjacent environments including handheld test gear. |
Pinout & Package
MAX38886ATD+T is housed in a 3mm × 3mm × 0.75mm TDFN-EP package with 14 pins and an exposed thermal pad (pin 14/EP) electrically connected to PGND. The package supports high-power density layout with low θJA (41°C/W) on four-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SYS | System supply input/output rail | Connects to 2.5V–5.0V source (e.g., removable battery); supplies load during normal operation and receives charge current during backup prep. |
| CAP | Supercapacitor connection node | Primary energy storage interface; connects directly to supercapacitor anode; voltage range programmable via FBCH divider. |
| LX | Inductor switching node | Drives external 1μH–4.7μH inductor; carries bidirectional peak currents up to 2.5A; requires low-inductance routing. |
| FBS | System voltage feedback input | Senses SYS rail via resistor divider; triggers boost mode when voltage drops below programmed minimum (e.g., 3.0V). |
| FBCH | Capacitor voltage feedback input | Senses CAP voltage via resistor divider; halts charging when supercapacitor reaches set maximum (e.g., 2.7V). |
| ISET | Charge/discharge current programming | Resistor-to-GND sets peak discharge current (IDISCHARGE = 2.5A × 20kΩ/RISET); charge current is 1/5 of discharge value. |
| EN | Enable control input | Active-high logic input; disables regulator and reduces shutdown current to ≤1μA when pulled low. |
| PGND | Power ground terminal | High-current return path for LX, CAP, and SYS; must be tied to exposed thermal pad for thermal and EMI performance. |
| GND | Analog ground reference | Low-noise reference for feedback comparators and bias circuits; separate from PGND to minimize noise coupling. |
| CAPS | Capacitor sense input | Monitors CAP node for protection functions; used internally for overvoltage and reverse-current detection. |
Key Features
| Feature | Design Value |
|---|---|
| Reversible buck-boost topology | Single inductor supports both charging (buck) and discharging (boost), reducing BOM count and PCB area vs. dual-converter solutions. |
| True Shutdown™ protection | Internally disconnects SYS from CAP during disable or fault, preventing reverse current and enabling safe hot-swap of main battery. |
| Programmable voltage thresholds | FBS and FBCH inputs allow precise setting of system min-voltage and supercapacitor max-voltage using standard 1% resistors. |
| Zero-crossing detection | IZXP (25–75mA) and IZXN (25–75mA) ensure clean transition between charge/discharge modes without inductor current discontinuity. |
| Thermal robustness | θJC = 8°C/W and exposed PGND pad enable reliable 2.5A discharge operation in compact industrial enclosures without forced airflow. |
Applications
| Handheld Industrial Test Equipment | Portable Medical Monitoring Devices |
|---|---|
Use Scenario: Battery-powered multimeter or oscilloscope loses main power mid-measurement. IC Role / Device Role / Timing Role: Backup regulator maintaining 3.3V system rail from supercapacitor during 500ms–2s switchover to auxiliary power or safe shutdown. Use Value: Prevents data corruption and preserves calibration state using <100mF supercapacitor charged during normal operation. | Use Scenario: Wearable ECG monitor operates continuously on removable Li-ion battery; requires uninterrupted sensing during battery swap. IC Role / Device Role / Timing Role: Bidirectional power manager sustaining 3.0V rail from 2.7V supercapacitor bank for ≥1.5s while new battery engages. Use Value: Enables zero-interruption patient monitoring with <2.5μA ready current extending supercapacitor self-discharge life to >72 hours. |
| POS Terminals with Removable Batteries | Ruggedized Tablet PCs |
Use Scenario: Retail point-of-sale terminal experiences sudden AC adapter removal during transaction processing. IC Role / Device Role / Timing Role: Charge/discharge controller delivering up to 2.5A peak current from 10F supercapacitor to sustain 3.6V CPU rail. Use Value: Guarantees transaction completion and secure log write within 800ms using programmable 2.5A discharge limit and ±2% voltage accuracy. | Use Scenario: Field-deployed tablet PC undergoes rapid battery replacement in outdoor logistics environment. IC Role / Device Role / Timing Role: Reversible regulator maintaining 4.2V system bus from dual 5.5V supercapacitors during 1.2s hot-swap window. Use Value: Eliminates reboot cycle by sustaining DDR memory retention and real-time OS context using 2MHz switching and 1μH inductor. |
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+T | Same pinout and function but includes integrated 100mΩ high-side FET; no external LX switch required. | Reduces external component count but increases cost and limits inductor flexibility. | Select MAX38887ATD+T only if minimizing bill-of-materials outweighs need for adjustable inductor selection. |
| TPS61094DSER | Integrated 2.2μH inductor; fixed 3.3V/3.6V output; no supercapacitor voltage programming; 2A max discharge. | Targeted at simpler backup needs where programmability and wide voltage range are not required. | Choose TPS61094DSER for cost-sensitive consumer devices with fixed-rail requirements and no need for custom supercapacitor voltage limits. |
Compared with MAX38886ATD+T, MAX38887ATD+T simplifies layout but sacrifices design flexibility, while TPS61094DSER trades programmability for integration-making MAX38886ATD+T optimal for industrial designs requiring precise voltage/current tuning and thermal resilience.
Availability
MAX38886ATD+T is available at Aetrix Electronics and suitable for handheld industrial equipment, portable medical monitors, and ruggedized tablet PCs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX38886ATD+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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX38886ATD+T belongs to Maxim's supercapacitor backup regulator product line, engineered specifically for seamless, high-efficiency power switchover in battery-removable systems where data integrity and uptime are critical.
FAQ
What is the maximum supercapacitor voltage supported by the MAX38886ATD+T?
The MAX38886ATD+T supports a maximum supercapacitor voltage of 4.5V, set externally via the FBCH feedback divider (e.g., 0.5V reference × [1 + RCTOP/RCBOT]). This allows safe operation with common 2.7V and 3.0V-rated supercapacitors while providing headroom for transient spikes. The device halts charging when VFBCH reaches 0.5V, ensuring precise voltage clamping without overvoltage risk to the storage element.
How does the MAX38886ATD+T manage power direction during main supply failure?
Upon main supply (VSYS) drop below the programmed minimum, the MAX38886ATD+T automatically switches from buck (charge) to boost (discharge) mode, drawing power from the supercapacitor to maintain the system rail. It uses a fixed on-time, current-limited PFM control scheme with zero-crossing detection to prevent shoot-through and ensure smooth transition. The MAX38886ATD+T sustains regulation until VCAP falls to ~0.5V, delivering up to 2.5A peak current to the load.
Can the MAX38886ATD+T operate with different inductor values?
Yes, the MAX38886ATD+T is designed to work with inductors from 1μH to 4.7μH. A 1μH inductor is recommended for most applications to support 2MHz switching and minimize size; larger values reduce peak current ripple but extend minimum off-time requirements. Inductor selection must align with the chosen ISET resistor (e.g., 20kΩ–100kΩ) to maintain accurate current limiting in both charge and discharge phases of the MAX38886ATD+T.
What is the role of the CAPS pin on the MAX38886ATD+T?
The CAPS pin on the MAX38886ATD+T provides direct sensing of the supercapacitor voltage for internal protection functions, including overvoltage lockout and reverse-current prevention when VCAP exceeds VSYS. It is not a feedback input like FBCH but serves as a dedicated monitoring node that enables the MAX38886ATD+T's True Shutdown™ feature-ensuring safe isolation between SYS and CAP during disable or fault conditions.
Does the MAX38886ATD+T require external components for basic operation?
Yes, the MAX38886ATD+T requires external components for full functionality: two 22μF ceramic capacitors (at SYS and CAP), a 1μH–4.7μH inductor (LX to CAP), and three resistor dividers (for FBS, FBCH, and ISET). These are mandatory for voltage regulation, current setting, and stability. The MAX38886ATD+T integrates all control circuitry, MOSFET drivers, and protection logic-eliminating need for external gate drivers or discrete power switches-but relies on these passive elements to define operating parameters.
MAX38886ATD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, Storage Capacitor
- Voltage - Input:
- 2.5V ~ 5V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 4.5V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TDFN (3x3)
MAX38886ATD+T FAQ
1.How can I place an order for MAX38886ATD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX38886ATD+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 MAX38886ATD+T reliable?
The price and inventory of MAX38886ATD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX38886ATD+T is usually 5 days.
3.What payment methods are accepted for MAX38886ATD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX38886ATD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX38886ATD+T?
MAX38886ATD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX38886ATD+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 MAX38886ATD+T?
For technical support, including MAX38886ATD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX38886ATD+T requirements.
6.How does Aetrix verify that MAX38886ATD+T is sourced from the original manufacturer or authorized distributors?
All MAX38886ATD+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 MAX38886ATD+T meets industry standards.
7.What is the process for return or replacement of MAX38886ATD+T?
All MAX38886ATD+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX38886ATD+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 MAX38886ATD+T part is unused and in its original packaging.
Return procedure for MAX38886ATD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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