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Analog Devices Inc./Maxim Integrated MAX38889AATE+
- Part No.:
- MAX38889AATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX38889AATE+.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:716
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Product details
Overview
MAX38889AATE+ from Maxim Integrated is a reversible buck/boost regulator IC designed for supercapacitor-based backup power systems. It delivers ±1% threshold accuracy, 94% peak efficiency in both charging and discharging modes, and supports 1A–3A pin-programmable peak inductor current. The device operates across 2.5V–5.5V system voltage and 0.5V–5.5V supercapacitor voltage ranges, enabling reliable backup in handheld industrial equipment and removable-battery portable computers.
For engineers reviewing the MAX38889AATE+ datasheet, MAX38889AATE+ pinout, MAX38889AATE+ application, or MAX38889AATE+ equivalent, this page provides verified functional context, validated pin roles, confirmed backup/charge timing behavior, real-world efficiency curves at 1.2MHz switching frequency, and design-meaningful specifications for supercapacitor voltage regulation, ready/backup flag logic, and True Shutdown™ isolation.
Technical Context
The MAX38889AATE+ implements dual-mode adaptive control: forced discontinuous conduction mode (DCM) during supercapacitor charging and pulse-frequency-modulation (PFM) with current limiting during backup discharge. Its internal MUX selects between buck and boost controllers based on VFBS and VFBCR thresholds, with independent 10mV hysteresis on FBCH and FBCR inputs.
True Shutdown™ disconnects SYS from CAP and blocks reverse current when VCAP > VSYS. Status flags RDY and BKB are open-drain outputs with defined low-voltage thresholds (VFBCR < 0.5V releases RDY; VFBS < 1.2V pulls BKB low), each requiring external 1MΩ pullup to SYS rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| System Voltage Range | 2.5V to 5.5V - defines minimum/maximum operating voltage for main supply rail (VSYS) without shutdown or regulation loss. |
| Supercapacitor Voltage Range | 0.5V to 5.5V - sets usable voltage window for storage element (VCAP), supporting low-voltage preservation and high-voltage charge termination. |
| Peak Inductor Current Limit | 1A to 3A - pin-programmable via ISET resistor (33kΩ–100kΩ), directly setting maximum energy transfer rate during charge/discharge cycles. |
| Quiescent Current (Ready State) | 4µA - ultra-low standby draw after supercapacitor reaches target voltage, enabling multi-week readiness without battery drain. |
| Switching Frequency | 1.2MHz - fixed high-frequency operation enabling compact 0.47µH inductor and minimizing output ripple in space-constrained layouts. |
| Threshold Accuracy | ±1% - guarantees precise activation of backup mode at 1.2V FBS and ready state at 0.5V FBCR, critical for deterministic system failover. |
| Efficiency (Peak) | 94% - measured in both buck (charging) and boost (backup) modes, reducing thermal load and extending supercapacitor runtime. |
Pinout & Package
MAX38889AATE+ uses a 3mm × 3mm, 16-pin TQFN package (exposed pad, RoHS-compliant) with θJA = 43.3°C/W on four-layer board. Thermal performance relies on robust GND pad connection via multiple capped vias to internal ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENC | Charger Enable Input | Logic-controlled gate for buck-mode charging; high (>950mV) enables charging when VSYS exceeds FBCH-set threshold. |
| ENB | Backup Enable Input | Logic-controlled gate for boost-mode backup; high (>950mV) permits discharge when VSYS falls below FBS-set UVLO. |
| RDY | Ready Status Output | Open-drain flag pulled low when VFBCR < 0.5V; signals supercapacitor voltage has reached user-defined ready level. |
| BKB | Backup Status Output | Open-drain flag pulled low when VFBS = 1.2V; indicates active boost regulation and system backup engagement. |
| CAP | Supercapacitor Terminal | Main energy storage interface; requires 22µF ceramic capacitor placed adjacent to minimize high-frequency impedance. |
| LX (Pins 6,7,8) | Inductor Switching Node | Shared node for buck/boost power stage; connects to 0.47µH inductor; must be physically isolated from feedback traces. |
| FBCR | Supercapacitor Ready Feedback | Sets RDY activation voltage via resistor divider from CAP; 0.5V threshold with 10mV hysteresis ensures stable flag transition. |
| FBCH | Supercapacitor Charge Feedback | Sets maximum VCAP via resistor divider; 0.5V threshold with 2.5% hysteresis prevents oscillation near full-charge point. |
| FBS | System Backup Feedback | Sets VSYS backup voltage via resistor divider; 1.2V regulation point with 102.5% hysteresis defines charge/backup mode boundary. |
| ISET | Current Programming Input | Resistor-connected pin that scales both peak charge (ILX_CHG) and backup (ILX_BU) currents linearly from 1A to 3A. |
| SYS (Pins 13,14) | System Supply Input | Main power rail interface; requires dual 47µF + dual 22µF ceramic bypass plus 1µF high-frequency filter to PGND. |
| PGND (Pins 15,16) | Power Ground Return | Low-impedance return path for LX switching current; must be separated from analog GND (EP) except at single-point star connection. |
| GND (EP) | Analog Ground / Thermal Pad | Exposed pad tied to AGND; mandatory thermal vias to inner ground plane required for junction temperature control below 150°C. |
Key Features
| Feature | Design Value |
|---|---|
| Reversible Buck/Boost Architecture | Single IC manages bidirectional energy flow between SYS and supercapacitor-eliminates need for separate charger + boost converter. |
| True Shutdown™ Isolation | Physically disconnects SYS from CAP and blocks reverse current when VCAP > VSYS, preventing system damage during fault conditions. |
| Pin-Programmable Peak Current | ISET resistor (33kΩ–100kΩ) sets identical 1A–3A limits for both charge and backup modes-enables optimization for load profile and runtime. |
| Dual Independent Status Flags | RDY and BKB provide real-time, hardware-level visibility into supercapacitor readiness and active backup state-no firmware polling required. |
| Ultra-Low Quiescent Current | 4µA ready-state draw extends shelf life and preserves supercapacitor charge over months-critical for infrequently powered industrial sensors. |
Applications
| Handheld Industrial Equipment | Portable Devices with Removable Battery |
|---|---|
Use Scenario: Power loss during field data capture in ruggedized handheld meters or barcode scanners. IC Role / Device Role / Timing Role: Regulates SYS rail from supercapacitor during main battery removal or brownout, maintaining MCU operation for safe data save. Use Value: Enables deterministic 3–10s backup window at 3V/200mA using 2.7V/2.56F supercapacitor-verified by energy calculation in datasheet Figure 1. |
Use Scenario: Hot-swap battery replacement in medical tablets or rugged laptops without system reset. IC Role / Device Role / Timing Role: Seamlessly transitions from battery to supercapacitor power within 4ms (per toc12 waveform), preserving OS state and active sessions. Use Value: Achieves <4ms VSYS transition time with no voltage droop below 2.7V-guaranteed by 94% efficiency and 1.2MHz PFM control. |
| Industrial Sensor and Actuator Nodes | Aftermarket Automotive Tracking Units |
Use Scenario: Maintaining wireless transmission during brief mains outage in factory-floor vibration sensors. IC Role / Device Role / Timing Role: Supplies regulated 3.3V to LoRaWAN transceiver during 5–15s grid interruption, using pre-charged supercapacitor. Use Value: Delivers 94% efficiency at 1A load (toc09), minimizing heat rise in sealed enclosures and extending supercapacitor cycle life. |
Use Scenario: Preserving GPS location lock and cellular handshake during vehicle ignition sequence or battery disconnect. IC Role / Device Role / Timing Role: Provides 3V backup to GNSS module and LTE modem during 100ms–2s cranking dip, using 1.5V–2.7V VCAP range. Use Value: Supports 0.5V–5.5V VCAP range (per Electrical Characteristics table), enabling use of low-leakage 2.7V supercaps rated for automotive temp range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reversible backup regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX38887AATE+ | Same 3mm×3mm TQFN package and pinout; supports only 1.8V–5.5V SYS range and lacks True Shutdown™ isolation. | Not suitable where VCAP > VSYS reverse-current blocking is required; limited to lower-VSYS systems. | Select MAX38887AATE+ only if system operates ≤5.5V and reverse isolation is unnecessary. |
| TPS61094DSKR | Integrates 470nF bypass capacitor; fixed 2A peak current; no pin-programmable ISET; 2.5V–5.5V SYS range. | Lacks independent ENC/ENB enables and dual status flags-requires external logic for mode control and monitoring. | Choose TPS61094DSKR for cost-sensitive designs needing integrated bypass but accepting reduced configurability. |
Compared with MAX38887AATE+, MAX38889AATE+ adds True Shutdown™ and wider 2.5V–5.5V SYS range; versus TPS61094DSKR, it offers programmable current, dual enable inputs, and hardware-ready/backup flags-making it optimal for industrial failover-critical systems.
Availability
MAX38889AATE+ is available at Aetrix Electronics and suitable for handheld industrial equipment, portable devices with removable battery, and aftermarket automotive tracking units requiring stable component supply across extended temperature ranges.
Supply support for MAX38889AATE+ 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 computing applications.
The MAX38889AATE+ belongs to Maxim's backup power regulator product line, engineered specifically for supercapacitor-based hold-up in space-constrained, high-reliability systems where deterministic failover and ultra-low quiescent current are mandatory.
FAQ
What is the function of the ISET pin on the MAX38889AATE+?
The ISET pin on the MAX38889AATE+ sets both peak charging and backup discharge currents via an external resistor (33kΩ–100kΩ). With RISET = 33kΩ, MAX38889AATE+ delivers up to 3A peak inductor current in either direction; at 100kΩ, it scales down to 1A. This direct scaling enables precise matching of current capability to system load and supercapacitor size without firmware intervention.
How does the MAX38889AATE+ handle system voltage dropout during backup mode?
During backup mode, the MAX38889AATE+ regulates VSYS using adaptive on-time PFM control. When VSYS drops to the UVLO threshold (2.1V–2.3V), the boost regulator ceases delivering load current, preserving remaining supercapacitor energy. The BKB flag remains low until VFBS rises above 1.23V, confirming exit from backup-ensuring clean, hysteresis-stabilized mode transitions per Electrical Characteristics table.
Can the MAX38889AATE+ operate without external resistors on FBCH and FBCR?
No. The MAX38889AATE+ requires external resistor dividers on FBCH (to set VCAP_MAX) and FBCR (to set RDY activation voltage). These dividers define critical thresholds: FBCH at 0.5V ±10mV determines supercapacitor full-charge point, while FBCR at 0.5V ±10mV triggers the RDY flag. Omitting them disables voltage regulation and status reporting-both are mandatory for functional operation of MAX38889AATE+.
What thermal design practices are required for reliable MAX38889AATE+ operation at +125°C?
To sustain MAX38889AATE+ operation at +125°C ambient, the exposed pad (GND/EP) must connect to an internal ground plane via ≥6 capped thermal vias (0.3mm diameter). A four-layer PCB with ≥2oz copper on inner layers and dedicated SYS/PGND/CAP copper pours is required to achieve the specified θJA = 43.3°C/W. Without this layout, junction temperature may exceed 150°C, triggering overtemperature lockout at 165°C.
Does the MAX38889AATE+ support simultaneous charging and backup operation?
No. The MAX38889AATE+ operates in mutually exclusive modes: charging (buck) when VSYS > FBCH-set threshold and backup (boost) when VSYS < FBS-set UVLO. Mode selection is hardware-determined by feedback voltages-no overlap or concurrent operation is possible. ENB and ENC pins can disable either mode independently, but the IC never performs both functions simultaneously.
MAX38889AATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 3A
- Frequency - Switching:
- 1.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX38889AATE+ FAQ
1.How can I place an order for MAX38889AATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX38889AATE+ 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 MAX38889AATE+ reliable?
The price and inventory of MAX38889AATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX38889AATE+ is usually 5 days.
3.What payment methods are accepted for MAX38889AATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX38889AATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX38889AATE+?
MAX38889AATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX38889AATE+ 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 MAX38889AATE+?
For technical support, including MAX38889AATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX38889AATE+ requirements.
6.How does Aetrix verify that MAX38889AATE+ is sourced from the original manufacturer or authorized distributors?
All MAX38889AATE+ 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 MAX38889AATE+ meets industry standards.
7.What is the process for return or replacement of MAX38889AATE+?
All MAX38889AATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX38889AATE+, 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 MAX38889AATE+ part is unused and in its original packaging.
Return procedure for MAX38889AATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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