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ZMDI is expanding its family of smart charger ICs with two new chargers for use with photovoltaic sources

As a global supplier of analog and mixed signal solutions for automotive, industrial, medical, information technology and consumer applications, ZMDI enables best-in-class energy efficient solutions for mobile and battery-powered applications with its Smart Power Management technology.

Both the ZSPM4521 and ZSPM4523 are configurable for termination voltages and charge currents to allow optimum charging for a wide range of Li-ion batteries or super capacitors. They can regulate up to 1.5A continuous drive current and use a maximum power point tracking (MPPT) function to extract the maximum possible power from the photovoltaic charging source. Once the termination voltage is reached, the MPPT regulator operates in voltage mode to maintain optimal voltage. The switching frequency is 1MHz , which enables the use of small filter components, resulting in smaller board space and reduced system costs. An integrated I2C (trademark of NXP) interface enables the user to set application-specific termination voltages and control charging currents.

The ZSPM4521 has an additional charge timeout feature to protect the Li-ion battery from overcharge. It also offers separate settings for termination voltage and maximum charge current for different battery temperature ranges. It provides Li-ion-specific protection for over-current, over-temperature, over-voltage, under-voltage and charging timeout. The ZSPM4523 is optimized for super capacitor charging. It provides protection for over-current, over-temperature, over-voltage and under-voltage.

The ZSPM45XX family is in a league of its own when it comes to its high level of integration, up to 92% efficiency and ultra-low power consumption. When the regulator is disabled, the device typically draws 10µA quiescent current.

Smart Charger Features:

• Maximum power point tracking (MPPT) for optimized charging
• Ultra-low quiescent current, 10µA
• 1.5A continuous output current
• Reverse-current blocking
• Programmable termination voltage and charging current
• Over-voltage and charging-timeout supervisor
• Input supply under-voltage lockout
• Full protection for over-current and over-temperature
• Charge status indication
• I2C program interface with EEPROM registers
• Temperature (junction) range -40°C to 125°C
• Package: 16-L PQFN (4mm x 4mm)

Availability & Pricing:

ZSPM4521: USD1.85/Euro 1.37 @1k
ZSPM4523: USD1.58/Euro 1.17 @1k