ACT2103YH-T Active-Semi

ACT2103-001 ACT2103 Rev 2, 23-May-12 18V/3A Step-Down DC/DC Converter FEATURES GENERAL DESCRIPTION 3A Output Current ACT2103 is a monolithic synchronous buck regulator. The device integrates two 85m Wide 4.5V to 18V Operating Input Range MOSFETs, and provides 3A of continuous load Synchronous Buck Topology current over a wide input voltage of 4.5V to 18V. Integrated 85m Power MOSFET Switches Current mode control provides fast transient Output Adjustable from 0.923V to 12V response and cycle-by-cycle current limit. Hiccup at short circuit reduces IC temperatures. Up to 96% Efficiency An internal soft-start prevents inrush current at turn- Stable with Low ESR Ceramic Output on, and in shutdown mode the supply current drops Capacitors to 10 A. Pulse-skipping mode at light load reduces Internal Soft Start standby power down to 3mA. 3mA Low Standby Input Current This device, available in an 8-pin SOP-8EP High Light Load Efficiency package, provides a very compact solution with Cycle-by-Cycle Over Current Limit minimal external components. Input Under Voltage Lockout Hiccup Protection at Short Circuit and Over Current Frequency Fold Back Protection Low Power Dissipation at Over Current and Short Circuit APPLICATIONS LCD-TV Set-top Box Distributed Power Systems Networking Systems Efficiency vs. Load Current 100 95 V = 7V IN 90 85 V = 18V IN 80 75 70 V = 12V IN 65 60 V = 5V OUT 55 10 100 1000 10000 Load Current (mA) TM Innovative Power - 1 - www.active-semi.com Copyright 2012 Active-Semi, Inc. Efficiency (%) ACT2103 Rev 2, 23-May-12 ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE PACKAGE PINS PACKING ACT2103YH-T -40C to 85C SOP-8EP 8 TAPE & REEL PIN CONFIGURATION PIN DESCRIPTIONS PIN NAME DESCRIPTION High-Side Bias Input. This pin acts as the positive rail for the high-side switch's gate 1 HSB driver. Connect a 10nF or greater capacitor between HSB and SW pins. Input Supply. Bypass this pin to GND with a low ESR capacitor. Drive IN with a 4.5V to 2 IN 18V power source. See Input Capacitor in the Application Information section. Switch Output. Connect this pin to the switching end of the external inductor. Note that 3 SW a capacitor is required from SW to HSB to power the high-side switch. 4 GND Ground. Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a 5 FB resistive voltage divider from the output voltage. The feedback threshold is 0.923V. See Setting the Output Voltage. Compensation Node. COMP is used to compensate the regulation control loop. See 6 COMP Compensation Components. Enable Input. When higher than 2.5V, this pin turns the IC on. When lower than 2.3V, 7 EN this pin turns IC off. When left unconnected, EN is pulled up to logic HIGH with a 2A pull-up current. EN is a digital input that turns the regulator on or off. 8 N/C Not connected. TM Innovative Power - 2 - www.active-semi.com Copyright 2012 Active-Semi, Inc.