RFMW

Status: Discontinued | Data Sheet: pdf link image   | RoHS Compliance: Rohs Compliant
Overview

Qorvo’s ACT4751 is a programmable DC-to-DC buck converter with bias supply rails for microcontrollers or USB PD controllers. It supports a wide input voltage range from 4.5 to 40 V and uses a synchronous step-down (buck) voltage regulator architecture. It integrates both the high side and low side MOSFETS. These 50 mOhm RDSON transistors enable high efficiency to reduce power losses.

The product’s main buck converter can be dynamically programed to an output voltage between 3 and 24 V in 12.5 mV steps via the I2C interface or analog feedback. It also can dynamically program output current between 0 and 4 A in 256 steps via the I2C interface 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. ACT4751 is a perfect solution for USB Power Delivery (PD) 3.0 and Programmable Power Supply (PPS) applications.

The product 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 a controller and the 1.5 W VCONN line in active USB-C cables.

ACT4751 is available in a 32-pin 5mm x 5mm QFN package with a power optimized footprint and exposed pad for improved thermal performance.

Key Features
  • USB certified charger design available
  • 50 mOhm integrated high-/low-side FETs
  • 4.5 to 40 V operational input voltage
  • 5 V bias, 350 mA buck converter
  • Programmable output voltage by I2C from 3 to 24 V in 12.5 mV steps
  • Programmable output current limit from 0 to 4 A in 256 step resolution
  • Fixed-frequency current-mode control from 450 kHz to 2.25 MHz with external clock sync and a 100% duty operation
  • Out of AM radio / spread-spectrum operation
  • 20 mA AUX LDO programmable output voltage from 0.9 to 4.0 V
  • I2C interface, fast-mode plus (Fm+, 1 MHz) with configurable address
  • Protections: UVLO, OVP, UVP (Hiccup/Latch-off), OCP, TSD
Typical Applications
  • USB PD 3.0 Charging Hubs
  • Power Management for USB-C Power Rails
  • Industrial SMPS for 24V Bus
  • High Power LED Lighting
Part Number:
ACT4751QI101-T
Manufacturer:
Qorvo
Topology:
Step-Down
Input Voltage:
4.5 - 40 V
Max Output Current:
4 A
Frequency:
450 - 2250 kHz
Certification:
USB PD 3.0 PPS
Programmable Current Limit:
Output
Auxiliary Power Rails:
Mini-Buck: 350mA; LDO: 20mA
Package Type:
32-pin, QFN
Package:
5 x 5 mm

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Product Specifications For ACT4751QI101-T DC-DC Sync Converter with FET
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 Product may be included on Section 301 Tariff List and subject to applicable tariff charges.