DESCRIPTION

A7442 is a High Efficiency Synchronous DC-DC Buck Converters with CV / CC modes, which can output up to 4.2 A in a wide input range from 6 V to 36 V. The A7442 operates either in CV (Constant Voltage) mode or CC (Constant Current) mode. With the CV / CC mode, adjustable current limit and output voltage, the A7442 is particularly suitable for QC 2.0 / 3.0 (12V / 1.5A, 9V / 2A and 5V / 3A), Type-C PD (5 V / 3 A) and Apple portable device (5V / 2.4A) applications. The output voltage and CC limit can be programed through the FB, CSP and CSN pins respectively.

In order to achieve better EMI performance and comply with Apple’s MFi standard, the switching frequency was fixed at 130kHz. A7442 is capable to operate in CC mode down to 3V output voltage to protect the soft-short condition that is from the over current of the portable device

A discharge circuitry is integrated to quickly and reliably discharge output capacitors to avoid the faulty voltage delivery in case of output over voltage and ensure safe operation for QC 2.0 / 3.0 application. The hiccup mode output Under Voltage Protection(UVP) can reduce the average input current to 50mA. Features such as output cord voltage drop compensation and low voltage drop operation is especially suitable for car charger.

The A7442 is available in PSOP8 package.

FEATURES

? Wide Inpu t Supply Voltage Range of 6 V ~ 40V

? Up to 4.2 A Output Current

? Up to 95 Efficiency

? 130 kHz Fixed Switching Frequency

? Internal Soft start Circuitry

? Compensation for Output Cord Voltage Drop

? Input Under Voltage Lockout

? Input Over Voltage Protection

? Adjustabl e Constant Current Limit

? Output Over Voltage Protection

? Output Auto Discharge

? Cycle by Cycle Peak Current Limit

? Hiccup Mode Output UVP for Soft short 3 V

? Thermal Shutdown

? Available in PSOP8 p ackage

APPLICATION

? Car Charger

? Portable Charging Devices

? CV / CC regulation DC / DC converter