Active Semi

ACT4751
Demoboard ACT4751EVK1-101 User’s Guide

USB PD 3.0 Power IC with 40V Input Voltage, 4A, Programmable Output Voltage and Current

Topologie: Buck
Eingangsspannung (min.): 4.00 V
Eingangsspannung (max.): 40.00 V
Schaltfrequenz (min.): 450.00 kHz
Schaltfrequenz (max.): 2250.00 kHz
Ausgang 1: 24.00 V / 4.000 A

Erstveröffentlichung am 16.05.2019, Version REF01

Beschreibung

The 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 of 4.5 V to 40 V and uses a synchronous step-down (buck) voltage regulator architecture. It integrates both the high side and low sideMOSFETS. These 50mΩ RDSON transistors enable high efficiency to reduce power losses.The ACT4751 main buck converter can be dynamically programed 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 modecontrol that supports external clock syncing for switching frequencies between 450 kHz and 2.25 MHz. The ACT4751 is a perfect solution for USB Power Delivery (PD) 3.0 and Programmable Power Supply (PPS) applications.The ACT4751 integrates a 5 V / 350 mA minibuck converter and a 20 mA AUX LDO to simplify application system designs. These rails can power up a controller and the 1.5W VCONN line in active USB-C cables.The ACT4751 is available in a 32-pin 5mm x 5mm QFN package with a power optimized footprint and exposed pad for improved thermal performance.

Merkmale

  • USB Certified Charger Design Available
  • 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
  • Fixed-Frequency Current-Mode Control from 450k to 2.25 MHz with External Clock Sync and 100% Duty Operation
  • 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

Artikel

  Artikel Nr. SPEC Produktserie RDC
(mΩ)
L
(µH)
IR
(A)
ISAT
(A)
fres
(MHz)
Version λDom typ.
(nm)
Farbe λPeak typ.
(nm)
IV typ.
(mcd)
VF typ.
(V)
Chiptechnologie 50% typ.
(°)
Anwendung Interface typ Typ Gender Pins Montageart IR 1
(A)
Arbeitsspannung
(V (AC))
Verpackung C
(µF)
VR
(V (DC))
Endurance
(h)
Betriebstemperatur IRIPPLE
(mA)
RESR
(mΩ)
ILeak
(µA)
DF
(%)
P
(mm)
Ø D
(mm)
L
(mm)
Technische Artikelnummer Tol. C Keramiktyp H
(mm)
Muster
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