ACT4752中文资料威讯联合数据手册PDF规格书

FEATURES

• Certified USB Fast Charger, Reference Designs

• Qualcomm® Certified, Quick Charger Designs

• 4.5 V to 40 V Operational Input Voltage

• Programmable Output Voltage by I2C

3 V to 24 V in 12.5 mV Step

• Programmable Output Current Limit

4 A in 256 Step Resolution

• 450 kHz to 2.25 MHz Fixed-Frequency Current-Mode

Control with External Clock Sync, 100% Duty Operation,

Stable with Low-cost MLCC

• Out of AM Radio / Spread-Spectrum Operation

• 50 mΩ Integrated High-Side / Low-Side FETs

• 5 V / 350 mA Bias Buck Converter

• 20 mA AUX LDO, Programmable Output Voltage

• I2C Interface, Fast-mode Plus (Fm+, 1 MHz) with

Configurable Address

• Protections:

UVLO, OVP, UVP (Hiccup/Latch-off), OCP, TSD

• Thermally Enhanced 5 mm × 5 mm QFN Package

APPLICATIONS

• USB Fast Charger (PD 3.0 PPS)

• Quick Charge 4, Quick Charge 4+, Quick Charge 3.0

• Industrial Power Supply

• Infrastructure Power Supply

• High Power LED Lighting

GENERIC DESCRIPTION

The ACT4752 is a programmable DC-to-DC buck converter

with bias supply rails. This synchronous step-down voltage

regulator supports a wide input voltage of 4.5 V to 40 V and

integrates both the high side and low side MOSFETS. These

50mΩ RDSON transistors enable high efficiency by reducing

power losses.

The ACT4752 main buck converter can be dynamically

programmed to an output voltage between 3 V and 24 V

in 12.5 mV steps via the I2C or analog feedback. Also, it

can dynamically program output current between 0 A to

4 A in 256 steps via the I2C in a constant-current (CC)

operation mode. The main-buck operates in a proprietary

current mode control that supports external clock syncing for

switching frequencies between 450 kHz and 2.25 MHz.

The ACT4752 is a perfect solution for USB Power Delivery

3.0 Programmable Power Supply (PD 3.0 PPS) charging

applications. The ACT4752 integrates a 5 V / 350 mA

mini-buck converter and a 20 mA AUX LDO to simplify

application system designs. These rails can power up USB

PD controllers and the 1.5W VCONN line in active USB-C

cables.

The ACT4752 is available in a 32-pin 5mm x 5mm QFN

package with a power optimized footprint and exposed pad

for improved thermal performance.