ACT4070B Wide Input 3A Step Down Converter FEATURES GENERAL DESCRIPTION 3A Output Current ACT4070B is a wide input voltage step-down DC/DC converter that provides up to 3A output current Up to 95% Efficiency at 300kHz switching frequency. ACT4070B is a 6V to 30V Input Range replacement part for ACT4070 with advanced features 100A Shutdown Supply Current such as lower standby current and higher light load 4mA Standby Input Current efficiency. ACT4070B can be dropped into ACT4070 300kHz Switching Frequency socket with only feedback resistance value changed. Output Voltage Up to 12V ACT4070Bs protection features include Cycle-by-Cycle Cycle-by-Cycle Current Limit Protection current limit, thermal shutdown, and frequency foldback Thermal Shutdown Protection at over current and short circuit. The devices are Internal Soft Start Function available in a SOP-8EP package and require very few external devices for operation. Frequency Fold Back at Short Circuit Stability with Wide Range of Capacitors Including Low ESR Ceramic Capacitors Note: ACT4070B is the replacement part for ACT4070. SOP-8/EP (Exposed Pad) Package APPLICATIONS TFT LCD Monitors or Televisions and HDTV Portable DVD Players Car-Powered or Battery-Powered Equipment Set-Top Boxes Telecom Power Supplies DSL and Cable Modems and Routers TYPICAL APPLICATION CIRCUIT Data Sheet Rev. B, November 2019 Subject to change without notice 1 of 10 www.qorvo.com 2020 Qorvo US, Inc. All rights reserved. ACT4070B Wide Input 3A Step Down Converter ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING ACT4070BYH-T -40C to 85C SOP-8/EP 8 TAPE & REEL PIN CONFIGURATION N/C EN COMP FB SOP-8/EP PIN DESCRIPTIONS PIN NUMBER NAME DESCRIPTION Bootstrap. This pin acts as the positive rail for the high-side switchs gate driver. Connect a 10nF 1 BS between this pin and SW. Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Capacitor in Application 2 IN Information section. 3 SW Switch Output. Connect this pin to the switching end of the inductor. 4 GND Ground. Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor divider 5 FB between output and ground to set output voltage. 6 COMP Compensation Pin. See Compensation Technique in Application Information section. Enable Input. When higher than 1.6V, this pin turns the IC on. When lower than 1.5V, this pin turns 7 EN the IC off. This pin has a small internal pull up current to a high level voltage when pin is not connected. 8 N/C Not Connected. Exposed Pad shown as dashed box. The exposed thermal pad should be connected to board ground plane and pin 4. The ground plane should include a large exposed copper pad under the package EP EP for thermal dissipation (see package out- line). The leads and exposed pad should be flush with the board, without offset from the board surface. Data Sheet Rev. B, November 2019 Subject to change without notice 2 of 10 www.qorvo.com 2020 Qorvo US, Inc. All rights reserved.