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Analog Devices Inc./Maxim Integrated MAX1538ETI+T
- Part No.:
- MAX1538ETI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX1538ETI+T.pdf
- Description:
- IC BATT PWR MGMT 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
MAX1538ETI+T from Maxim Integrated is a dual-battery power-source selector IC that autonomously selects between AC adapter, airline adapter, and two Li-ion battery packs based on presence detection, state-of-charge monitoring, and undervoltage thresholds. It features break-before-make switching (≤0.88 µs transition), direct P-channel MOSFET gate drive (±70 mA sink/source), 50 µA max battery quiescent current, and relearn-mode support for coulomb-counting fuel gauges - deployed in notebook computers requiring hot-swap-capable, aircraft-compliant power management.
For engineers reviewing the MAX1538ETI+T datasheet, MAX1538ETI+T pinout, MAX1538ETI+T application, or MAX1538ETI+T equivalent, this page delivers verified specifications including 4.75–28 V ADPIN input range, 3.3 V ±10 mV LDO output, 2 V ACDET/AIRDET trip threshold with 20 mV hysteresis, 13 V BAT_ minimum voltage trip point, and 28-pin thin QFN (5 mm × 5 mm) package compatibility.
Technical Context
The MAX1538ETI+T implements a deterministic state machine with analog comparators for ACDET (2.0 V ±30 mV), AIRDET (2.0 V ±30 mV), and dual battery undervoltage detection (5 × VMINVA/VMINVB). Its break-before-make timing ensures safe source transitions without cross-conduction, enforced by internal fixed delay logic and MOSFET driver turn-on/off times ≤0.88 µs.
It integrates independent gate drivers for eight external P-channel MOSFETs - ADPPWR/REVBLK (adapter path), ADPBLK/DISBAT (battery discharge control), CHGA/DISA and CHGB/DISB (per-battery charge/discharge) - all referenced to their respective supply rails (ADPIN, EXTLD, CHGIN, BATA, BATB) with clamp voltages from –8.0 V to –6.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | ADPIN: 4.75–28 V; CHGIN/BATA/BATB/BATSUP: 4.75–19 V - supports wide-input AC adapters and dual Li-ion stacks up to 4S. |
| LDO Output | VDD = 3.3 V ±10 mV at 100 µA - powers system logic with 1 mV/V PSRR and -60 mV UVLO hysteresis. |
| Comparator Thresholds | ACDET/AIRDET: 2.0 V ±30 mV with 20 mV hysteresis; BAT_ undervoltage: 13 V ±140 mV (5 × VMINV_) - enables precise adapter/battery presence and safe discharge cutoff. |
| Quiescent Current | Max 40 µA from highest supply (VBATSUP); ADPIN standby current ≤9 µA - minimizes battery drain during adapter absence. |
| MOSFET Driver Performance | Sink current ≥10 mA, source current ≥3 mA, turn-on/off time ≤0.88 µs - directly drives P-MOSFETs without external level shifters or buffers. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and portable computing environments. |
| Package | 28-pin thin QFN, 5 mm × 5 mm footprint - space-efficient for compact dual-battery systems. |
Pinout & Package
MAX1538ETI+T is housed in a 28-pin thin QFN package (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad. Pin 1 marked via top-side dot; pins 15 and 21 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MINVA / MINVB | Battery A/B undervoltage reference inputs | Set 5× threshold for discharge cutoff (e.g., VMINVA = 2.6 V → VBATA cutoff at 13 V); bias current <50 nA enables high-impedance divider design. |
| BATSEL / RELRN / CHRG | Logic control inputs | BATSEL selects A/B preference; RELRN enables relearn mode (overrides CHRG); CHRG enables charging - all accept 0.8 V low / 2.1 V high TTL-compatible levels. |
| OUT0 / OUT1 / OUT2 | Open-drain state indicator outputs | Encode 8 discrete states (e.g., "110" = AC adapter active; "001" = discharge Battery B); each sinks ≥25 mA for direct MCU GPIO interfacing. |
| ADPPWR / REVBLK / ADPBLK / DISBAT / CHGA / CHGB / DISA / DISB | P-channel MOSFET gate drivers | Each referenced to its local supply rail (ADPIN, EXTLD, CHGIN, BATA, BATB); provide ±70 mA peak drive with -6.5 V clamp for robust gate control. |
| ADPIN / BATA / BATB / BATSUP / EXTLD / CHGIN | Power input rails | ADPIN powers adapter path; BATA/BATB monitor batteries; BATSUP is diode-OR'd battery supply; EXTLD powers reverse-blocking path; CHGIN supplies charger interface. |
Key Features
| Feature | Design Value |
|---|---|
| Break-before-make switching | Guaranteed ≤0.88 µs dead time prevents shoot-through during source transitions - enables hot-swap of battery packs without system interruption. |
| Relearn-mode support | RELRN input forces AC adapter disconnect and battery discharge even when adapter is present - enables automated capacity calibration for fuel gauges like MAX1781. |
| Airline adapter detection | Dual comparator (ACDET + AIRDET) distinguishes airline adapters (VACDET < 2 V, VAIRDET > 2 V) and disables charging - meets aviation safety requirements. |
| Direct P-MOSFET drive | Eight rail-referenced gate drivers eliminate need for external level shifters or Schottky diodes - reduces BOM count and layout complexity. |
| Low-quiescent-current operation | 40 µA max from highest supply and ≤9 µA ADPIN standby current - extends battery runtime in always-on portable systems. |
Applications
| Notebook Power Management | Aircraft-Compliant Portable Systems |
|---|---|
|
Use Scenario: Dual-battery notebook PC with AC adapter, airline adapter, and hot-swap capability. IC Role / Device Role / Timing Role: Autonomous power-path selector managing adapter/battery arbitration, undervoltage cutoff, and relearn-mode discharge sequencing. Use Value: Eliminates need for host µP firmware to monitor power sources in real time - reduces development effort and system power consumption during standby. |
Use Scenario: Ruggedized tablet used onboard commercial aircraft with regulated 28 V DC supply. IC Role / Device Role / Timing Role: Airline adapter detector and charger disable controller ensuring no battery charging occurs during flight. Use Value: Meets FAA/EASA compliance by automatically disabling charge paths when AIRDET is asserted - no software intervention required. |
| Dual-Battery Industrial Tablet | Step-Up/Step-Down Charger Interface |
|
Use Scenario: Field-deployable tablet requiring >12-hour runtime using swappable 2S/3S Li-ion packs. IC Role / Device Role / Timing Role: Battery presence/absence detector with 2 V pack-removal threshold and 125 mV hysteresis for reliable hot-swap signaling. Use Value: Prevents brownout during battery swap via break-before-make timing and blanking (12–31 ms) - maintains uninterrupted system load operation. |
Use Scenario: Portable medical device using buck-boost charger supporting variable input (9–24 V) and dual-cell battery. IC Role / Device Role / Timing Role: Charger node supervisor coordinating CHGIN rail, DISBAT gate control, and CHGA/CHGB enable signals. Use Value: Enables single-chip integration of step-up and step-down charger interfaces - eliminates separate adapter/battery arbitration logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-source selection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1537ETI+T | Single-battery variant; lacks BATB, DISB, CHGB, MINVB, and AIRDET pins - no airline detection or Battery B support. | Only suitable for single-battery systems; cannot replace MAX1538ETI+T in dual-battery designs. | Select only if system uses one battery and requires identical adapter arbitration, relearn mode, and 28-pin QFN footprint. |
| BQ24725ARGER | TI battery charger with integrated power-path selector; supports single/dual batteries but lacks dedicated airline adapter detection and relearn-mode logic. | Requires external firmware coordination for relearn cycles; no native AIRDET comparator - needs discrete circuitry for aircraft use. | Consider when combined charging + selection is needed and airline compliance is not required; verify gate-drive compatibility with existing MOSFETs. |
Compared with MAX1537ETI+T, the MAX1538ETI+T adds full dual-battery arbitration and airline detection; compared with BQ24725ARGER, it provides hardware-enforced relearn mode and dedicated AIRDET functionality - making it uniquely suited for certified aviation and hot-swap notebook applications.
Availability
MAX1538ETI+T is available at Aetrix Electronics and suitable for notebook computers, internet tablets, and dual-battery portable equipment requiring stable component supply, long-lifecycle assurance, and aerospace-grade reliability validation.
Supply support for MAX1538ETI+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 demanding industrial, computing, and automotive applications.
The MAX1538ETI+T belongs to Maxim's power-path management product line, engineered specifically for autonomous, firmware-light power arbitration in dual-battery portable systems - emphasizing hot-swap safety, aircraft compliance, and coulomb-gauge relearn support.
FAQ
What is the function of the RELRN pin on the MAX1538ETI+T?
The RELRN pin on the MAX1538ETI+T enables battery relearn mode: when driven high with an AC adapter present, it forces adapter disconnect and initiates controlled battery discharge - allowing fuel gauges to recalibrate capacity. In MAX1538ETI+T, RELRN overrides CHRG and is ignored during airline mode or when the selected battery is undervoltage-latched.
How does the MAX1538ETI+T detect airline adapters versus standard AC adapters?
The MAX1538ETI+T uses dual comparators: ACDET triggers when VAIRDET < 2 V and VACDET > 2 V, indicating airline adapter presence; standard AC adapters assert both ACDET and AIRDET above 2 V. Upon airline detection, MAX1538ETI+T disables all charging paths while maintaining system power - a hardware-level safety feature.
What is the maximum allowable voltage on the ADPIN pin of the MAX1538ETI+T?
The absolute maximum rating for ADPIN on the MAX1538ETI+T is +30 V relative to GND, but the recommended operating range is 4.75 V to 28.0 V. Exceeding 28 V may cause excessive power dissipation or violate internal clamp limits - sustained operation above 28 V is not guaranteed per datasheet specifications.
Can the MAX1538ETI+T be used with step-up battery chargers?
Yes - the MAX1538ETI+T supports both step-down and step-up/step-down chargers, as confirmed in Figures 1 and 2 of the datasheet. Its CHGIN-supplied drivers (DISBAT, CHGA, CHGB) interface directly with boost converter outputs, and the ADPBLK/DISBAT coordination enables safe discharge path control during step-up charging.
What package type and dimensions does the MAX1538ETI+T use?
The MAX1538ETI+T uses a 28-pin thin QFN package measuring 5 mm × 5 mm with 0.5 mm pitch and an exposed thermal pad. This package is specified in the Ordering Information table and matches the pin configuration shown in the datasheet's Pin Description section - no alternate packages are offered for this variant.
MAX1538ETI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Power Management
- Battery Chemistry:
- -
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (5x5)
MAX1538ETI+T FAQ
1.How can I place an order for MAX1538ETI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1538ETI+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 MAX1538ETI+T reliable?
The price and inventory of MAX1538ETI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1538ETI+T is usually 5 days.
3.What payment methods are accepted for MAX1538ETI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1538ETI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1538ETI+T?
MAX1538ETI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1538ETI+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 MAX1538ETI+T?
For technical support, including MAX1538ETI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1538ETI+T requirements.
6.How does Aetrix verify that MAX1538ETI+T is sourced from the original manufacturer or authorized distributors?
All MAX1538ETI+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 MAX1538ETI+T meets industry standards.
7.What is the process for return or replacement of MAX1538ETI+T?
All MAX1538ETI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1538ETI+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 MAX1538ETI+T part is unused and in its original packaging.
Return procedure for MAX1538ETI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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