What are the DC-DC high current step-down power supply chips? Today, I would like to recommend several car chargers and dedicated high current car charging and voltage reducing IC solutions.

Recommendation for DC-DC high current step-down power supply chips:

Small shell and small volume, it is recommended to use 4.8A built-in MOS, CX8576 high current preferred solution

CX8576 Overview:

CX8576 is a step-down DC-DC converter with an input withstand voltage of 30V and the ability to achieve precise constant voltage and dual constant current

CX8576 is equipped with 10m Ω High side N MOS and 10m Ω Low side NMOS, which can support 4.8A continuous output current and adjustable output voltage, with a maximum support of 95% duty cycle

The CX8576 achieves external shutdown function by lowering the logic level of the COMP/EN pin and entering standby mode. External compensation enables the feedback control loop to have good line voltage adjustment rate and load adjustment rate, and the peripheral design is flexible.

CX8576 is a constant voltage, constant current, and step-down DC-DC converter with minimal application, excellent performance, and stable reliability

CX8576 Features:

• Input voltage can reach 4.75V-30V

• Built in 10m Ω High side NMOS

• Built in 10m Ω Low side NMOS

• support 4.8A continuous output current

• support 95% duty cycle

• Output voltage and current can be set (2.5V-20V)

• Constant current accuracy ± 6%

• Constant voltage accuracy ± 2% (VFB=1.0V)

• Cable compensation voltage drop

• Adjustable switching frequency (110KHz-220KHz)

• COMP pin achieves both external compensation and shutdown control simultaneously

• Short circuit protection (SCP), overheat protection (OTP), overvoltage protection (OVP).

• The built-in SW cycle by cycle detection mode can prevent RSENT current limiting resistor short circuits from damaging the product.

• QFN20L-5 × 5 Packaging Forms

CX8576 applies to:

• Car charger

• Portable device power supply

Large volume, can consider using external dual N MOS, 4.8A dual current limiting CX8571

CX8571 external CX4520 dual N MOS capable of 4.2A

CX8571 external CX3203 dual N MOS capable of 4.8A

CX8571 external NCE4060K dual N MOS capable of 5-7A

CX8571 Overview:

CX8571 is a buck type PWM controller that can drive dual output 8A (4A+4A) load current. The design allows CX8571 to operate within a wide input voltage range of 9V to 40V. External shutdown function is achieved by lowering the logic level of the COMP/EN pin and entering standby mode. External compensation enables the feedback control loop to have good line voltage and load adjustment rates, and the peripheral design is flexible.

CX8571 can operate in CC (constant current output) or CV (constant voltage output) modes, and the overcurrent protection (OCP) current value can be set through external current detection resistance.

CX8571 is suitable for DC/DC switching power supplies with limited current requirements. The chip is packaged in MSOP10 and requires fewer external devices.

CX8571 Features:

• Voltage input range: 9-40V

• Output voltage accuracy (Vref=1.0V): ± 2.0%

• Dual channel CC/CV mode

• Dual channel external current limiting

• Over temperature protection (OTP)

• Built-in soft start time 3ms

• Fixed frequency 120KHz

• Input undervoltage protection (minimum 7 V, typical 7.5 V, maximum 8 V)

• Duty cycle range: 0-95%

• One pin can achieve external compensation and shutdown control

• Ceramic capacitors can be used for output

• Built-in adjustable line voltage compensation

• MSOP10 Packaging

CX8571 is applied to:

• car charger 

• High brightness lighting

• Portable device power supply

• Universal DC/DC controller with current limiting function