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Analog Devices Inc./Maxim Integrated MAX77840EWG+T
- Part No.:
- MAX77840EWG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- -
- Datasheet:
-
MAX77840EWG+T.pdf
- Description:
- INTERFACE PMIC FOR SMART PHONE
- Quantity:
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Inventory:1,168
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Product details
Overview
The MAX77840EWG+T from Maxim Integrated is a 3.15A buck-mode Li-ion battery charger with integrated ModelGauge m5 fuel gauge, USB BC1.2 adapter detection, and SAFEOUT LDO-designed for compact portable electronics requiring precise state-of-charge (SOC) monitoring, adaptive input current limiting, and reverse OTG boost up to 1.5A. It operates at programmable 2MHz/4MHz switching frequency and features true battery disconnect FET (RDS(ON) = 12.8mΩ).
For engineers reviewing the MAX77840EWG+T datasheet, MAX77840EWG+T pinout, MAX77840EWG+T application, or MAX77840EWG+T equivalent, key selection criteria include ±1% SOC accuracy without calibration, shipping mode with ONKEY wake-up, I²C 3.0 interface with interrupt output, and 9×9 WLP package (3.87mm × 3.96mm, 0.4mm pitch) for space-constrained designs.
Technical Context
The MAX77840EWG+T integrates a synchronous buck charger with CC/CV/temperature regulation, ModelGauge m5 coulomb-counting + OCV-based fuel gauging, and Smart Power Selector logic that prioritizes system power over charging during shared input conditions. Its USB BC1.2 D+/D− detection supports USB SDP, CDP, DCP, and HVDCP recognition with automatic input current limit configuration.
Charging control includes dead-battery prequalification, thermal foldback, and JEITA-compliant temperature-aware charging via external thermistor. The integrated SAFEOUT LDO delivers regulated output from SYS rail, while the proprietary MAXOTG protection enforces current-limited reverse boost (programmable up to 1.5A) without system voltage collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charging Current | Up to 3.15A max; enables fast charge of single-cell Li-ion in <3 hours for 2000mAh batteries. |
| Fuel Gauge Accuracy | ±1% state-of-charge (SOC); eliminates factory calibration cycles and improves runtime prediction fidelity. |
| Switching Frequency | Programmable 2MHz or 4MHz; allows selection of 0.47µH or 1µH inductor for size vs. efficiency trade-off. |
| Input Voltage Range | Up to 13.4V operating, 16V withstand; supports wide-input USB adapters and industrial wall adapters. |
| OTG Boost Current | Up to 1.5A programmable; powers USB peripherals without external boost IC or layout changes. |
| Package | 9×9 bump WLP (3.87mm × 3.96mm, 0.4mm pitch); ultra-compact footprint for thin handheld devices. |
| Quiescent Current (Fuel Gauge) | 25µA typical in standby; extends shelf life and reduces battery drain during storage. |
Pinout & Package
The MAX77840EWG+T is housed in a 3.87mm × 3.96mm, 9×9 wafer-level package (WLP) with 0.4mm ball pitch. This ultra-small, bottom-terminal package is optimized for high-density portable PCB layouts and requires microvia or plated-through-hole interconnects.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHGIN | Input power supply | Accepts up to 16V; feeds internal charger, SAFEOUT LDO, and system rail via Smart Power Selector. |
| BAT | Battery connection | Direct connection to Li-ion anode; integrates true-disconnect FET (12.8mΩ) for zero-current storage. |
| SYS | System power rail | Regulated output from buck converter; powers SoC, display, and peripherals; supplies SAFEOUT LDO input. |
| SW | Switch node | Connects to external inductor; switching at 2/4MHz determines inductor size and thermal performance. |
| DP/DN | USB data lines | Enable BC1.2 D+/D− detection for adapter classification and automatic input current limit setting. |
| ONKEY | Hardware power control | True hardware reset and shipping mode exit; debounced by internal circuitry, no external RC needed. |
| INTB | Interrupt output | Open-drain active-low signal indicating charge status, fault, or fuel-gauge alert events. |
| SCL/SDA | I²C interface | 3.0-compatible serial bus (up to 1MHz); supports register read/write, configuration, and real-time telemetry. |
| DETBATB | Battery presence detect | Active-low input confirming battery insertion; used for safe startup and cell removal handling. |
Key Features
| Feature | Design Value |
|---|---|
| ModelGauge m5 fuel gauge | ±1% SOC accuracy with time-to-empty/full prediction and no calibration required-reducing BOM cost and test time. |
| Adaptive Input Current Limiting (AICL) | Dynamically adjusts CHGIN current to prevent adapter overload while maximizing available power-critical for unregulated wall adapters. |
| MAXOTG reverse boost protection | Hardware-enforced 1.5A current limit on OTG mode prevents SYS rail collapse under heavy load-eliminates need for external current-sense feedback. |
| Integrated true battery disconnect FET | 12.8mΩ RDS(ON), 9A RMS rating; enables shipping mode with <1µA battery drain and safe hot-plug battery replacement. |
| JEITA-compliant charging | Configurable temperature thresholds (via registers TAlrtTh/TAlrtTh2) enable safe charging across -10°C to +50°C ambient-required for medical and IoT deployments. |
Applications
| Portable Medical Devices | Mobile Point-of-Sale Terminals |
|---|---|
Use Scenario: Handheld glucose meters and portable ECG monitors requiring long shelf life and accurate remaining runtime indication. IC Role / Device Role / Timing Role: Single-chip power management unit providing battery charging, fuel gauging, and system power regulation. Use Value: ±1% SOC accuracy ensures reliable low-battery warnings; shipping mode reduces annual self-discharge to <1%-extending device shelf life beyond 2 years. | Use Scenario: Battery-powered credit card terminals used in retail environments with intermittent USB charging. IC Role / Device Role / Timing Role: USB BC1.2-compliant charger with automatic adapter detection and fast-charge capability. Use Value: D+/D− detection identifies USB SDP/CDP/DCP sources and configures optimal input current limits-preventing brownouts during transaction processing. |
| Wireless Speakers | Smart Home Sensors |
Use Scenario: Rechargeable Bluetooth speakers needing compact power solution with reverse-boost capability for accessory charging. IC Role / Device Role / Timing Role: Buck charger + OTG boost controller enabling speaker to act as power bank for earbuds or wearables. Use Value: Programmable 1.5A OTG current supports simultaneous audio playback and peripheral charging without thermal throttling. | Use Scenario: Battery-operated occupancy or environmental sensors deployed in hard-to-reach locations. IC Role / Device Role / Timing Role: Ultra-low-quiescent fuel gauge and efficient charging subsystem minimizing standby current. Use Value: 25µA fuel gauge IQ extends 2000mAh battery life to >10 years in sleep mode-reducing maintenance and replacement costs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25895RTWR | Higher 5A max charge current; no integrated fuel gauge; separate fuel gauge IC required. | Requires external fuel gauge (e.g., BQ27441) for SOC reporting-increasing BOM count and calibration complexity. | Choose when higher charge rate is critical and fuel gauge functionality can be added separately. |
| ISL9238HRZ-T | Includes SMBus interface and dual-cell support; lacks USB BC1.2 detection and ModelGauge m5 algorithm. | Targeted at 2-cell Li-ion systems (e.g., rugged tablets); not suitable for single-cell USB-powered devices. | Prefer for multi-cell applications where USB adapter detection is handled externally. |
Compared with BQ25895RTWR and ISL9238HRZ-T, the MAX77840EWG+T uniquely combines ±1% fuel gauging, USB BC1.2 detection, and 3.15A charging in one WLP package-reducing component count, layout area, and firmware integration effort for single-cell portable designs.
Availability
The MAX77840EWG+T is available at Aetrix Electronics and suitable for portable medical devices, mobile point-of-sale terminals, and wireless speakers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX77840EWG+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, medical, and consumer applications.
The MAX77840EWG+T belongs to Maxim's highly integrated battery management product line, engineered specifically for space-constrained, USB-powered portable electronics requiring accurate fuel gauging, intelligent charging, and minimal external components.
FAQ
What is the maximum supported battery charging current for the MAX77840EWG+T?
The MAX77840EWG+T supports a maximum battery charging current of 3.15A. This value is programmable via I²C registers and is enforced by internal current-sense circuitry. It enables rapid charging of single-cell Li-ion batteries up to ~2000mAh capacity within three hours while maintaining thermal safety through die temperature regulation and thermal foldback.
Does the MAX77840EWG+T include USB BC1.2 compliance, and how does it function?
Yes, the MAX77840EWG+T includes full USB BC1.2 compliance via dedicated DP/DN pins. It performs D+/D− detection to identify USB SDP, CDP, DCP, and HVDCP adapters, then automatically configures the optimal input current limit (e.g., 500mA for SDP, 1.5A for DCP). This eliminates manual configuration and ensures safe, adapter-aware power delivery without host processor intervention.
How does the ModelGauge m5 fuel gauge in the MAX77840EWG+T achieve ±1% SOC accuracy without calibration?
The MAX77840EWG+T's ModelGauge m5 uses a hybrid algorithm combining coulomb counting with open-circuit voltage (OCV) tracking and dynamic impedance compensation. It learns battery characteristics over cycles and applies temperature-compensated OCV curves-enabling ±1% SOC accuracy across 0–100% range without factory or field calibration, even after storage or partial discharge.
What is the purpose of the ONKEY pin on the MAX77840EWG+T, and what functions does it support?
The ONKEY pin on the MAX77840EWG+T provides true hardware-level power control: a short press exits shipping mode, a long press triggers a hardware reset, and release initiates normal system power-up sequencing. It operates independently of firmware, ensuring deterministic behavior during battery insertion, recovery from deep discharge, or forced system restart-critical for field-deployed devices.
Can the MAX77840EWG+T support reverse boost (OTG) operation, and what protections are included?
Yes, the MAX77840EWG+T supports reverse boost (OTG) operation delivering up to 1.5A from the battery to VBUS. It includes proprietary MAXOTG protection that actively limits output current to prevent SYS rail collapse under heavy loads. This hardware-enforced current limit operates without external components and maintains system stability during simultaneous charging and peripheral powering.
MAX77840EWG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX77840EWG+T FAQ
1.How can I place an order for MAX77840EWG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77840EWG+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 MAX77840EWG+T reliable?
The price and inventory of MAX77840EWG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77840EWG+T is usually 5 days.
3.What payment methods are accepted for MAX77840EWG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77840EWG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77840EWG+T?
MAX77840EWG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77840EWG+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 MAX77840EWG+T?
For technical support, including MAX77840EWG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77840EWG+T requirements.
6.How does Aetrix verify that MAX77840EWG+T is sourced from the original manufacturer or authorized distributors?
All MAX77840EWG+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 MAX77840EWG+T meets industry standards.
7.What is the process for return or replacement of MAX77840EWG+T?
All MAX77840EWG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77840EWG+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 MAX77840EWG+T part is unused and in its original packaging.
Return procedure for MAX77840EWG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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