MAX77976EFD+T – Comprehensive Datasheet Summary
(Extracted from Analog Devices document MAX77975/MAX77976, Rev. 4, February 2025)

1. Device Identity• Orderable Part Number: MAX77976EFD+T• Description: 19 VIN, 5.5 A, 1-cell Li+ switching battery charger with Smart Power Selector™ and USB-C PD OTG• Package Code: FC2QFN (4 mm × 4 mm, 0.4 mm pitch, 32-pin)• Temperature Grade: –40 °C to +85 °C• Tape & Reel: 2500 pcs / reel (T suffix)• RoHS Status: Lead-free / RoHS-compliant (+ suffix)• Top-side Marking: “MAX77976” + traceability codes
2. Key Applications• Gaming handhelds, VR/AR headsets, tablet PCs, mPOS, power-bank modules, USB-C PD source/sink devices.
3. Electrical Highlights• Input Range: 4.7 V – 19 V operating, 28 V absolute max• Charge Current: 0.1 A – 5.5 A programmable (50 mA step)• Buck Efficiency: 91.2 % @ 4 A, 12 VIN• OTG Boost: 5 V – 12 VOUT, up to 18 W (3.1 A max)• Switching Frequency: 1.3 MHz / 2.6 MHz pin-less selectable• Battery Regulation: 4.15 V – 4.46 V ±0.3 % (10 mV step)• Quiescent Battery Drain: 7.5 µA (factory-ship mode)• Inductor: 1 µH (1.3 MHz) or 0.47 µH (2.6 MHz)
4. Power-Path & Smart Power Selector• Automatic source transition: adapter ↔ battery• Battery-to-SYS FET: 7.7 mΩ typ, 10 A continuous• True battery disconnect in ship mode / OTG / fault• Supplement mode: battery assists adapter when system load > adapter rating
5. Charging Profile (JEITA-compliant, NTC thermistor)
6. Pre-charge: 55 mA, VBAT < 2.5 V
7. Trickle: 300 mA (TKEN=1), 2.5 V < VBAT < 3.1 V
8. Fast-charge CC: 0.1-5.5 A, 3.1 V < VBAT < 4.46 V
9. Fast-charge CV: current tapers to 150-850 mA (ITO)
10. Top-off: 30-70 min programmable
11. Done: ICHG = 0, 10 µA typical leakage
12. Restart: 100/150/200 mV below VBATTREG
13. Safety & Protection• Input OVP: 19.5 V typ, 500 mV hysteresis• Input UVP: 4.7-5.05 V programmable• SYS OV/UV lockout, battery over-voltage, charge timer (3-8 h), watchdog (80 s), thermal shutdown (+155 °C), thermal fold-back (+85-130 °C programmable), short-circuit, ±200 mV remote-sense OV• Battery removal detection via THM pull-up
14. Digital Interface• I²C slave address 0x6B (7-bit); 0xD6 write, 0xD7 read• 1 kHz – 3.4 MHz bus speed (HS-mode)• Interrupt pin IRQB (open-drain) with 11 maskable sources• Registers: 37 charger-related, 8 top-system, OTP revision, chip-ID
15. Pin Summary (FC2QFN-32, 4×4 mm)PowerCHGIN 22-23, BYP 21, LX 17-19, BST 20, SYS 9-11, BATT 6-8, PGND 14-16, AGND 28, DGND 13AnalogBATSP 5, BATSN 4, THM 2, VDD 3, PVDD 12DigitalSCL 24, SDA 25, VIO 27, IRQB 32, STAT 29, QBEXT 30, EXTSM 26, DISQBAT 1, SUSPND 31
16. Typical Application Bill of Materials (excerpt)• Cin: 2×10 µF 35 V 0805 ceramic (CHGIN)• CBYP: 2×10 µF 35 V 0805 ceramic (BYP)• CSYS: 2×22 µF 10 V 0603 ceramic• CBATT: 10 µF 10 V 0603 ceramic• L: 1 µH ±20 % 6 mm×6 mm, ISAT ≥ 9 A (1.3 MHz)• NTC: 10 kΩ β = 3610 K, connect between THM and AGND• Optional Schottky: 6 A 30 V, anode CHGIN cathode BYP (for >15 V hot-plug)
17. Absolute Maximum Ratings• CHGIN/BYP: –0.3 V to +28 V• LX: –0.3 V to +22 V• BST: VLX –0.3 V to VLX +2.2 V• SYS/BATT: –0.3 V to +6 V• Continuous LX current: 5.7 ARMS• Continuous SYS/BATT current: 10 ARMS• TJmax: +150 °C, Tstorage: –65 °C to +150 °C
18. Thermal Characteristics (4-layer JEDEC 51-7)• θJA: 28.3 °C/W• θJC: 6.65 °C/W• Power derating: 35.3 mW/°C above +70 °C
19. Ordering & Tape InformationMAX77976EFD+T: 2500 pcs, 13-in reel, Pb-free, Moisture-Sensitivity Level-1, 260 °C peak-reflow compatible.
20. Evaluation & Support• Evaluation kit: MAX77976EVKIT# available from Analog Devices• IBIS & land-pattern: download from analog.com/MAX77976• Field-application schematic & Gerber: contact local FAE
21. Revision & Legal• Document Rev. 4, February 2025• Specifications subject to change without notice; refer to latest datasheet before production.