SP4521

SP4521 is a single-chip solution integrating synchronous switch charging and synchronous boost functions. It incorporates a synchronous switch charging module, a synchronous boost discharge management module, a battery gauge and LED indicator module, and a protection module. The chip features built-in charging and discharging power MOSFETs, with a charging current of 1A and a synchronous boost output current of 1A. It employs a patented adaptive charging current technology and eliminates the need for external power-setting resistors through a patented control method, reducing both power consumption and system cost. The chip integrates multiple protection features, including temperature compensation, over-temperature protection, overcharge and over-discharge protection, output overvoltage protection, and output heavy-load protection, ensuring the safety of both the chip and the Li-ion battery. Its application circuit is simple, requiring only a minimal number of external components to implement charge management and discharge management.

Applications

• Power bank

Key features

• Output current: 1A
• Charge current: 1A
• Charge efficiency up to 94%
• Discharge efficiency up to 94%
• No expensive power-setting resistor required
• Adaptive charge current technology
• Auto power on/off
• BAT discharge termination voltage: 2.9V
• Selectable 4.2V/4.35V charge voltage
• Intelligent temperature control with over-temperature protection
• Trickle charge and zero-voltage charging support
• Package: ESOP8