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IR3897 Datasheet(PDF) 1 Page - International Rectifier |
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IR3897 Datasheet(HTML) 1 Page - International Rectifier |
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1 / 47 page  - 1 - JANUARY 18, 2013 |DATA SHEET | Rev 3.5 1 IR3897 4A Highly Integrated SupIRBuck TM Single‐Input Voltage, Synchronous Buck Regulator PD‐97663 73 75 77 79 81 83 85 87 89 91 93 95 97 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4 Load Current (A) 1.2Vout 3.3Vout 12Vin,Internal bias,Frequency 600KHz FEATURES Single 5V to 21V application Wide Input Voltage Range from 1.0V to 21V with external Vcc Output Voltage Range: 0.5V to 0.86× Vin Enhanced Line/Load Regulation with Feed‐Forward Programmable Switching Frequency up to 1.5MHz Internal Digital Soft‐Start/Soft‐Stop Enable input with Voltage Monitoring Capability Thermally Compensated Current Limit with robust hiccup mode over current protection Smart Internal LDO to improve light load and full load efficiency External Synchronization with Smooth Clocking Enhanced Pre‐Bias Start‐Up Precision Reference Voltage (0.5V+/‐0.5%) with margining capability Vp for Tracking Applications (Source/Sink Capability +/‐4A) Integrated MOSFET drivers and Bootstrap Diode Thermal Shut Down Programmable Power Good Output with tracking capability Monotonic Start‐Up Operating temp: ‐40oC < Tj < 125oC Small Size: 4mm x 5mm PQFN Lead‐free, Halogen‐free and RoHS Compliant BASIC APPLICATION Figure 1: IR3897 Basic Application Circuit DESCRIPTION The IR3897 SupIRBuck TM is an easy‐to‐use, fully integrated and highly efficient DC/DC regulator. The onboard PWM controller and MOSFETs make IR3897 a space‐efficient solution, providing accurate power delivery. IR3897 is a versatile regulator which offers programmability of switching frequency and internal current limit while operates in wide input and output voltage range. The switching frequency is programmable from 300kHz to 1.5MHz for an optimum solution. It also features important protection functions, such as Pre‐Bias startup, thermally compensated current limit, over voltage protection and thermal shutdown to give required system level security in the event of fault conditions. APPLICATIONS Netcom Applications Embedded Telecom Systems Server Applications Storage Applications Distributed Point of Load Power Architectures Figure 2:IR3897 Efficiency |
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