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Analog Devices Inc./Maxim Integrated MAX77961BEFV12+
- Part No.:
- MAX77961BEFV12+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 30-PowerUFQFN
- Datasheet:
-
MAX77961BEFV12+.pdf
- Description:
- IC USB-C BUCK/BOOST CHARGER
- Quantity:
- Payment:
- Shipping:
Inventory:3,382
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Product details
Overview
The MAX77961BEFV12+ from Maxim Integrated is a wide-input (3.5V–25.4V), 6A buck-boost battery charger IC with integrated FETs, Smart Power Selector™, and reverse buck mode for USB OTG. It supports 2S/3S Li-ion batteries, delivers up to 97% peak efficiency at 15VIN/12.6VOUT/2AOUT, and enables system instant-on during deep-battery or no-battery conditions in portable medical monitors and handheld radios.
For engineers reviewing the MAX77961BEFV12+ datasheet, MAX77961BEFV12+ pinout, MAX77961BEFV12+ application, or MAX77961BEFV12+ equivalent, key selection considerations include programmable 100mA–6.3A input current limit, JEITA-compliant NTC thermistor monitoring, 4mm × 4mm 30-lead FC2QFN package, and I²C/resistor-based autonomous configuration for USB-C powered wide-input charging systems.
Technical Context
This device implements a synchronous 4-switch buck-boost topology with integrated 10mΩ BATT-to-SYS switch and true load disconnect in reverse buck mode. Its Smart Power Selector manages power path arbitration between CHGIN, battery, and SYS rail without external components, enabling seamless startup under dead-battery conditions.
The IC features adaptive input current limit (AICL), die temperature regulation via thermal foldback, and dual switching frequency options (600kHz/1.2MHz) to optimize EMI and efficiency trade-offs. Charge safety includes precharge, constant-current, constant-voltage, top-off, and timer-fault states-all configurable via I²C or resistor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 25.4V - supports USB PD, automotive, and industrial adapters without external LDO or boost stage |
| Max Charge Current | 6A - enables fast charging of 2S/3S Li-ion packs in smartphones and drones |
| Reverse Buck Output | 5.1V/3A - powers USB OTG accessories directly without secondary inductor |
| Peak Efficiency | 97% at 15VIN/12.6VOUT/2AOUT - reduces thermal stress in compact handheld terminals |
| Package | 4mm × 4mm, 30-lead FC2QFN - high-density layout compatible with space-constrained medical devices |
| Thermal Protection | Dual-mode: thermal foldback + shutdown at junction >125°C - ensures safe operation under sustained 10A SYS load |
| JEITA Compliance | NTC thermistor interface with programmable trip points - meets battery safety standards for health monitors and action cameras |
Pinout & Package
MAX77961BEFV12+ uses a 4mm × 4mm, 30-lead FC2QFN package with exposed thermal pad (package code F304A4F+1). Pin functions are validated per Maxim's official datasheet Rev 0 (June 2021), including dedicated analog inputs (THM, BATSP/BATSN), power switches (LX1/LX2), and I²C interface (SCL/SDA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CHGIN | Primary input supply | Accepts 3.5V–25.4V; withstands 30V transient - enables direct connection to USB-C PD or 24V industrial rails |
| BATT | Battery connection | Direct interface to 2S/3S Li-ion pack; supports battery insertion protection and differential voltage sensing (BATSP/BATSN) |
| SYS | System power rail | Regulated output powering SoC/FPGA; features 10mΩ internal switch and 10A overcurrent threshold |
| OTGEN | USB OTG enable control | Active-high signal activating reverse buck mode - allows host-controlled peripheral power delivery |
| THM | NTC thermistor input | Analog input for JEITA-compliant battery temperature monitoring - critical for medical-grade charge safety |
| STAT | Charge status indicator | Open-drain output encoding charger state (precharge, CC, CV, done, fault) per Table 10 in datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Smart Power Selector™ | Enables system startup with deeply discharged or missing battery - eliminates need for backup supercap or auxiliary LDO |
| Autonomous Configuration | ISET, INLIM, VSET, and ITO pins allow full charge profile setup without firmware - ideal for cost-sensitive consumer electronics |
| Adaptive Input Current Limit (AICL) | Dynamically adjusts CHGIN current to prevent adapter collapse - maintains stable operation with low-power wall adapters |
| True Load Disconnect | Hardware-enforced isolation between SYS and battery during reverse buck mode - prevents backfeed and meets USB OTG spec |
| Remote Differential Sensing | BATSP/BATSN pins compensate for PCB trace IR drop - ensures ±10mV battery voltage accuracy at pack terminals |
Applications
| Handheld Radios | Medical Health Monitors |
|---|---|
Use Scenario: Portable UHF/VHF transceivers requiring rapid recharge between field operations and extended runtime on 2S Li-ion. IC Role / Device Role / Timing Role: Primary buck-boost charger managing CHGIN-to-battery and battery-to-SYS power paths while supporting USB OTG for firmware updates. Use Value: 6A fast-charge capability cuts recharge time by >40% vs. 3A alternatives; Smart Power Selector ensures instant radio boot even after deep discharge. | Use Scenario: Wearable ECG or glucose monitors needing certified battery safety, low quiescent current, and reliable cold-temperature operation. IC Role / Device Role / Timing Role: JEITA-compliant charger with NTC thermistor interface and thermal foldback - enforces strict charge profiles per IEC 62368-1. Use Value: Sub-5µA shutdown current extends shelf life; ±10mV remote sensing guarantees accurate SOC estimation in clinical-grade diagnostics. |
| 2-in-1 Laptops | Power Tools |
Use Scenario: Detachable tablet/laptop hybrids with shared 3S battery and dual-role USB-C port for charging and peripheral connectivity. IC Role / Device Role / Timing Role: Dual-mode controller: buck-boost charger during AC input; reverse buck regulator supplying 5.1V/3A to USB peripherals when detached. Use Value: Eliminates need for separate OTG boost IC - reduces BOM count and PCB area by 30% in ultra-thin form factors. | Use Scenario: Cordless drills and impact drivers demanding high-current charging (≥5A), robust thermal management, and battery authentication support. IC Role / Device Role / Timing Role: High-efficiency 6A charger with 10A SYS switch and thermal foldback - sustains full power delivery during continuous motor load. Use Value: 97% peak efficiency minimizes heat buildup in sealed tool housings; programmable AICL prevents adapter brownout during high-torque bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25792RTWR | 4.5V–24V input, 5A max charge, integrated ADC for battery telemetry, no reverse buck mode | Lacks native 5.1V/3A OTG output - requires external boost IC for USB peripheral power | Preferred when high-precision fuel gauging and telemetry are prioritized over OTG integration |
| MP2731GQZ-0000-Z | 3.5V–26V input, 6.5A max charge, 2.5MHz switching, no JEITA NTC interface | Supports higher switching frequency for smaller magnetics but omits battery temperature compliance circuitry | Selected for space-constrained designs where JEITA is not mandated and thermal foldback suffices |
Compared with BQ25792RTWR and MP2731GQZ-0000-Z, the MAX77961BEFV12+ uniquely integrates reverse buck OTG, JEITA thermistor monitoring, and Smart Power Selector in a single 4mm × 4mm package - delivering system-level simplification for USB-C portable devices requiring both fast charging and peripheral power delivery.
Availability
MAX77961BEFV12+ is available at Aetrix Electronics and suitable for handheld radios, medical health monitors, and 2-in-1 laptops requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77961BEFV12+ 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 communications applications.
The MAX77961BEFV12+ belongs to Maxim's USB-C power delivery and battery management product line, engineered specifically for compact, high-efficiency charging in portable electronics with dual-role ports and stringent safety requirements.
FAQ
What is the maximum supported battery configuration for the MAX77961BEFV12+?
The MAX77961BEFV12+ is explicitly designed for 2-cell and 3-cell Li-ion battery packs, with charge termination voltages programmable up to 8.4V (2S) or 12.6V (3S). Its Smart Power Selector and integrated 10mΩ BATT-to-SYS switch ensure optimal power path management across both configurations, as confirmed in the "Detailed Description" section of the datasheet.
Does the MAX77961BEFV12+ support USB On-The-Go (OTG) functionality?
Yes, the MAX77961BEFV12+ supports USB OTG via its integrated reverse buck converter, delivering a regulated 5.1V/3A output. Activation is controlled by the OTGEN pin, and the design includes true load disconnect and adjustable output current limiting - all documented in the "Reverse Buck Mode (OTG)" section of the datasheet.
How is battery temperature monitoring implemented in the MAX77961BEFV12+?
The MAX77961BEFV12+ implements JEITA-compliant battery temperature monitoring through the THM pin, which interfaces with an external NTC thermistor. The IC provides programmable trip points and thermal foldback behavior, ensuring charge current reduction or suspension within defined temperature bands - fully detailed in the "JEITA Compliance" subsection of the datasheet.
Can the MAX77961BEFV12+ operate without I²C communication?
Yes, the MAX77961BEFV12+ supports fully autonomous operation using resistor-programmed inputs (ISET, INLIM, VSET, ITO, CNFG). This enables complete charge profile configuration - including input current limit, fast-charge current, termination voltage, and top-off threshold - without firmware or I²C bus, as verified in Table 4 and the "Autonomous Charging" section of the datasheet.
What thermal management features does the MAX77961BEFV12+ include?
The MAX77961BEFV12+ incorporates die temperature regulation via a thermal foldback loop that progressively reduces charge current above 95°C, plus hard thermal shutdown at ~125°C. Its 1.67°C/W junction-to-case thermal resistance (θJC) and exposed thermal pad in the FC2QFN package enable effective heat dissipation - specifications confirmed in the "Package Information" and "Thermal Management" sections.
MAX77961BEFV12+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 30-PowerUFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- -
- Voltage - Input:
- 3.5V ~ 25.4V
- Number of Outputs:
- 1
- Voltage - Output:
- 8V ~ 13.05V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 30-FC2QFN (4x4)
MAX77961BEFV12+ FAQ
1.How can I place an order for MAX77961BEFV12+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77961BEFV12+ 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 MAX77961BEFV12+ reliable?
The price and inventory of MAX77961BEFV12+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77961BEFV12+ is usually 5 days.
3.What payment methods are accepted for MAX77961BEFV12+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77961BEFV12+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77961BEFV12+?
MAX77961BEFV12+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77961BEFV12+ 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 MAX77961BEFV12+?
For technical support, including MAX77961BEFV12+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77961BEFV12+ requirements.
6.How does Aetrix verify that MAX77961BEFV12+ is sourced from the original manufacturer or authorized distributors?
All MAX77961BEFV12+ 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 MAX77961BEFV12+ meets industry standards.
7.What is the process for return or replacement of MAX77961BEFV12+?
All MAX77961BEFV12+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77961BEFV12+, 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 MAX77961BEFV12+ part is unused and in its original packaging.
Return procedure for MAX77961BEFV12+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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