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Product Introduction

The MAX8903GETI+T is a highly Integrated power path management chip launched by Maxim Integrated (now Analog Devices), specifically designed to handle the intelligent charging and switching management of two power inputs (such as USB and AC adapters) and lithium-ion batteries.
It features intelligent path switching, battery charging control, power priority discrimination and other functions. It is particularly suitable for portable electronic products such as smart phones, tablet computers and handheld devices, meeting the safe and efficient power supply requirements of devices when connected to USB interfaces or external power sources.

Key parameters

Parameter description

• Input voltage range: 4.1V to 6.0V (USB/AC input)
• The maximum battery charging current is 1.5A (adapter) and 500mA (USB).
• The battery interface supports a single lithium battery
• The power path switching automatically and seamlessly switches between DC/USB and battery
• The control mode can be selected as external control or automatic mode
• Package 28-pin TQFN (5mm × 5mm)
• Operating temperature range: -40°C to +85°C (industrial grade)

Main characteristics

• ✅ Dual input power supply intelligent switching (AC priority, automatic judgment)
• ✅ complete lithium battery charging control unit
• ✅ Battery undervoltage/overvoltage/over-temperature protection
• ✅ Power Path Management
• ✅ supports hot plugging, short circuit protection and overcurrent protection
• ✅ Highly integrated, with few external components, convenient for system design

Typical application fields

• 📱 Smartphones and tablets: Compatible with USB and wall plug dual charging scenarios
• 🔋 Portable medical devices: Critical systems that require highly reliable power switching
• 🎮 Handheld game console/multimedia player: Battery life and power supply stability are important
• Youdaoplaceholder0 Barcode scanners, handheld devices: long run requirements
• 📷 Portable photography equipment/industrial sensor module: Safe charging management important occasions

Pin Packaging and Function Description (TQFN-28)

Pin number name Function description

• 1-3 DCIN external power input (AC adapter)
• 4 to 6 USBIN USB power input
• 7 to 8 BATT battery connection interfaces
• 9-10 SYS system load output
• 11 CHG charging status output (low level indicates charging)
• 12 EN enable pin
• 13 FLAG Power status indication
• 14~28 GND/NC/control logic power supply ground and logic control channel

⚠️ Please refer to the official data sheet for confirmation of all pin definitions and functionality.

Compatible and alternative model recommendations

Model, brand, feature comparison, and packaging

• The BQ24074 TI also supports USB+AC power path management 16-DSBGA
• MCP73871 Microchip's lithium battery manager DFN with power path
• The ISL9237 Renesas is suitable for higher current multi-cell QFN batteries
• SY6986 Silergy features high-efficiency synchronous rectification and supports ESOP via USB
• TP4056 (Single input limited) Multi-factory low-cost USB Charging Manager (no path management) SOP-8

Simplified typical application circuit diagram (Concept)

+-----------+      +--------+
|  AC IN    |----->|        |
+-----------+     |        |---> SYS OUT
| MAX8903|
+-----------+     |        |
| USB IN    |----->        |
+-----------+      |        |
|        |---> BATT
+--------+
When AC and USB are connected simultaneously, MAX8903 automatically selects AC for priority power supply.
If the AC power is disconnected, it will automatically switch to USB or battery.
It contains battery charging current limiting and status indication inside.

Summary

The MAX8903GETI+T is a reliable and highly integrated power path management chip that can easily handle requirements such as switching control, charging management, and overcurrent protection in dual power input (USB and AC) scenarios. It has broad application prospects in portable devices and battery-powered systems and is an important component of modern embedded power architecture design.
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