PD-97528 IR3856MPbF TM HIGHLY EFFICIENT SupIRBuck INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR Features Description Greater than 95% Maximum Efficiency TM The IR3856 SupIRBuck is an easy-to-use, fully Wide Input Voltage Range 1.5V to 21V integrated and highly efficient DC/DC Wide Output Voltage Range 0.7V to 0.9*Vin synchronous Buck regulator. The MOSFETs co- Continuous 6A Load Capability packaged with the on-chip PWM controller make Integrated Bootstrap-diode IR3856 a space-efficient solution, providing High Bandwidth E/A for excellent transient accurate power delivery for low output voltage performance applications. Programmable Switching Frequency up to 1.5MHz Programmable Over Current Protection IR3856 is a versatile regulator which offers Over Voltage Protection programmability of start up time, switching Dedicated input for output voltage monitoring frequency and current limit while operating in Programmable PGood output wide input and output voltage range. Hiccup Current Limit The switching frequency is programmable from Precision Reference Voltage (0.7V, +/-1%) 250kHz to 1.5MHz for an optimum solution. Programmable Soft-Start Enable Input with Voltage Monitoring Capability It also features important protection functions, Enhanced Pre-Bias Start-up such as Pre-Bias startup, hiccup current limit and Seq input for Tracking applications thermal shutdown to give required system level External Synchronization security in the event of fault conditions. o o -40 C to 125 C operating junction temperature Thermal Protection 4mm x 5mm Power QFN Package Halogen Free, Lead Free and RoHS compliant Applications Distributed Point of Load Power Architectures Server Applications Netcom Applications Storage Applications Computing Peripheral Voltage Regulators General DC-DC Converters Embedded Telecom Systems Fig. 1. Typical application diagram 1 Rev 4.0 PD-97528 IR3856MPbF ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND unless otherwise specified) Vin . -0.3V to 25V Vcc ...... -0.3V to 8V (Note2) Boot .... -0.3V to 33V SW .. -0.3V to 25V(DC), -4V to 25V(AC, 100ns) Boot to SW ....... -0.3V to Vcc+0.3V (Note1) OCSet .. -0.3V to 30V (Max 30mA) Input / output Pins .. ... -0.3V to Vcc+0.3V (Note1) PGND to GND ..... -0.3V to +0.3V Storage Temperature Range ................................... -55C To 150C Junction Temperature Range ................................... -40C To 150C (Note2) ESD Classification JEDEC Class 1C Moisture sensitivity level...JEDEC Level 3 260 C (Note5) Note1: Must not exceed 8V o o Note2: Vcc must not exceed 7.5V for Junction Temperature between -10 C and -40 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. PACKAGE INFORMATION 4mm x 5mm POWER QFN o * = 45 C / W JA ( Sync FET ) o * = 45 C / W JA ( Ctrl FET ) 11 13 12 o PGnd = 2 C / W J -PCB SW V IN * Exposed pads on underside are connected to copper pads of a 4-layer (2 oz.) PCB 14 Boot 10 Vcc 17 Sync Enable 9 15 Gnd Seq PGood 16 8 1 23 4 5 7 6 Fb Vsns COMP Gnd Rt SS OCSet ORDERING INFORMATION PACKAGE PACKAGE PIN COUNT PARTS PER DESIGNATOR REEL DESCRIPTION M IR3856MTRPbF 17 4000 M IR3856MTR1PbF 17 750 2 Rev 4.0