ACT4455YH-T

ACT4455-001 ACT4455 Rev 2, 21-Nov-12 36V/5A Step Down DC/DC Converter FEATURES APPLICATIONS 7.5V to 36V Input Voltage Automotive Industry 40V Input Voltage Surge Dual-Output Car Charger Up to 5A Output Current LCD-TV Up to 12V Output Voltage GENERAL DESCRIPTION Dual Outputs with Independent Over Current ACT4455 is a wide input voltage step-down DC/DC Protection converter with high-side MOSFET integrated. It provides up to 5A continuous output current at 7.5% Accurate Over Current Protection (OCP) 200kHz switching frequency. The converter can be Integrated 45m High Side Power FET configured as single output or dual outputs with 90% Efficiency at Heavy Load independent over current protection. The converter achieves high efficiency and excellent load and line Internal 3ms Soft Startup regulation. The converter enters into hiccup and Low Standby Input Current sleeping mode and the converter power consumption is nearly zero when output is Sleeping Mode at OCP, OTP and SCP overloaded or shorted to ground. Other protection Zero Input and Output Currents at Over Current features includes cycle-by-cycle current limit, under and Short Circuit Protection voltage protection and thermal shutdown. The device is available in SOP8-EP package. Auto Recovery into Full Load after Faults Output Cord Voltage Drop Compensation Stable with Low ESR Ceramic Output Capacitors Internal Cycle-by-Cycle Current Control Programmable Over Current Setting SOP-8EP Package Efficiency vs. Load current 100 VIN = 12V 90 80 VIN = 24V V = 32V IN 70 60 50 0 1000 2000 3000 4000 5000 Efficiency (%) TM Innovative Power - 1 - www.active-semi.com Copyright 2012 Active-Semi, Inc. Output current (V) ACT4455 Rev 2, 21-Nov-12 ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE PACKAGE PINS PACKING ACT4455YH-T -40C to 85C SOP-8EP 8 TAPE & REEL PIN CONFIGURATION PIN DESCRIPTIONS PIN NAME DESCRIPTION The output current of V is sensed by this pin. When the voltage on this pin reaches OUT1 1 CS1 116mV for 750s, the IC shuts down for 2.5 seconds before initiating a restartup. 2 SW Switch Output. Connect this pin to the switching end of the external inductor. High Side Bias. This pin acts as the positive rail for the high-side switchs gate driver. 3 HSB Connect a 22nF-100nF capacitor between HSB and SW pins. 4 GND Ground. 5 COMP Compensation Node. COMP is used to compensate the voltage regulation loop. Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a 6 FB resistive voltage divider from the output voltage. The feedback threshold is 0.808V. See Setting the Output Voltage. 7 IN Input Supply. Bypass this pin to GND with a 10F or greater low ESR capacitor. The output current of V is sensed by this pin. When the voltage on this pin reaches OUT2 8 CS2 116mV for 750s, the IC shuts down for 2.5 seconds and then restarts. Exposed Pad Exposed Pad. Connect this pad to thick copper plane via copper vias. TM Innovative Power - 2 - www.active-semi.com Copyright 2012 Active-Semi, Inc.