ACT4070B-001 ACT4070B Rev 0, 23-Apr-12 Wide Input 3A Step Down Converter FEATURES GENERAL DESCRIPTION ACT4070B is a wide input voltage step-down 3A Output Current DC/DC converter that provides up to 3A output cur- Up to 95% Efficiency rent at 300kHz switching frequency. ACT4070B is a replacement part for ACT4070 with advanced fea- 6.5V to 30V Input Range tures such as lower standby current and higher light 100A Shutdown Supply Current load efficiency. ACT4070B can be dropped into ACT4070 socket with only feedback resistance 4mA Standby Input Current value changed. 300kHz Switching Frequency ACT4070Bs protection features include Cycle-by- Output Voltage Up to 12V Cycle current limit, thermal shutdown, and fre- Cycle-by-Cycle Current Limit Protection quency foldback at over current and short circuit. The devices are available in a SOP-8EP package Thermal Shutdown Protection and require very few external devices for operation. Internal Soft Start Function Frequency Fold Back at Short Circuit NOTE: Stability with Wide Range of Capacitors ACT4070B is the replacement part for Including Low ESR Ceramic Capacitors 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 Efficiency vs. Load Current 100 V = 12V IN 80 60 V = 24V IN 40 20 V = 5V OUT 0 1 10 100 1000 10000 Load Current (mA) TM Innovative Power - 1 - www.active-semi.com Copyright 2012 Active-Semi, Inc. Efficiency (%) ACT4070B Rev 0, 23-Apr-12 ORDERING INFORMATION PART NUMBER TEMPERATURE RANGE PACKAGE PINS PACKING ACT4070BYH -40C to 85C SOP-8/EP 8 TUBE ACT4070BYH-T -40C to 85C SOP-8/EP 8 TAPE & REEL PIN CONFIGURATION SOP-8/EP PIN DESCRIPTION PIN NUMBER PIN NAME PIN DESCRIPTION Bootstrap. This pin acts as the positive rail for the high-side switchs gate driver. 1 BS Connect a 10nF between this pin and SW. Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input Ca- 2 IN pacitor in Application 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 5 FB resistor divider between output and ground to set output voltage. Compensation Pin. See Compensation Technique in Application Information sec- 6 COMP tion. Enable Input. When higher than 1.6V, this pin turns the IC on. When lower than 7 EN 1.5V, this pin turns 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 con- nected to board ground plane and pin 4. The ground plane should include a large EP EP exposed copper pad under the package for thermal dissipation (see package out- line). The leads and exposed pad should be flush with the board, without offset from the board surface. TM Innovative Power - 2 - www.active-semi.com Copyright 2012 Active-Semi, Inc.