描述 Description

The AS1153 is a high efficiency synchronous buck converter with CC/CV modes, which can output current up to 4.5A in a wide input range from 6V to 40V. The AS1153 operates either in CC (constant current) mode or CV (constant voltage) mode, adjustable current limit and output voltage, the AS1153 is particularly suitable for QC2.0/QC3.0 (12V/1.5A, 9V/2A and 5V/3A), Type-CPD (5V/3A) 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 125KHz. AS1153 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 QC2.0/QC3.0 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.

AS1153 is available in ESOP-8L package which is beneficial for compact solution as well as thermal dissipation.

特性 Features

? High efficiency: up to 95%

? Input voltage range: 6V ~ 40V

? Output current: up to 4.5A

? Switching frequency: fixed 125kHz

? Adjustable constant current limit

? Compensation for output cord voltage drop

? Internal soft start circuitry

? Input UVLO & OVP function

? Output OVP & auto discharge

? Cycle by cycle peak current limit

? Hiccup mode output UVP for soft-short ≤ 3V

? Thermal shutdown

? Thermally Enhanced ESOP-8L package

應(yīng)用 Application

? Car charger & equipment

? Portable charging devices

? CC/CV regulation

? DC/DC converter