PD97401 IR3640MPBF HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER Features Description 4.5V to 5.5V external supply The IR3640M is a synchronous Buck PWM controller Wide Input voltage from 1.5V to 24V designed for performance demanding DC/DC Output voltage range: 0.7V to 0.9*Vin applications. The single loop voltage mode Programmable switching frequency up to 1.5MHz architecture simplifies design while delivery precise Programmable Soft-start output voltage regulation and fast transient response. Hiccup mode over current protection using Rds(on) Because of its wide input and output voltage range it sensing can be used in a large variety of point of load Programmable OCP applications within a system and across different o o Reference voltage 0.7V (+/-1%, 0 C <Tj<125 C) markets. Enhanced Pre-bias start up Output voltage tracking The part is designed to drive a pair of N-Channel Integrated MOSFET drivers and bootstrap diode MOSFETs from 250kHz to 1.5Mhz switching o o Operating temp: -40 C <Tj<125 C frequency giving designers the flexibility to optimize External synchronization the solution for best efficiency or smallest footprint. Power Good output The output voltage can be precisely regulated from as Thermal shut down low as 0.7V within a tolerance of +/-1% over Over voltage protection temperature, line and load variations. Enable Input with voltage monitoring capability Pb-Free & Halogen-Free (RoHS Compliant) The device also integrates a diversity of features 20 -Lead MLPQ package (3mmx4mm) including programmable soft start, pre-bias start up, Applications voltage tracking, external synchronization, enable Point of Load Power Architectures input and Power Good output. Fault protection Server & Netcom Applications features include thermal shutdown, over voltage and Game Consoles over current shutdown and under voltage lock out. General DC/DC Converters Typical Application 06/15/2009 1IR3640MPBF ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND unless otherwise specified) Vcc and PVcc ...... -0.3V to 8V (Note2) Boot ....... -0.3V to 40V SW ....... -4V (100ns), -0.3V(DC) to 31V Boot to SW ........ -0.3V to Vcc+0.3V (Note1) LDrv to PGND ... -0.3V to Vcc+0.3V (Note1) HDrv to SW ... -0.3V to BOOT+0.3V (Note1) OCSet ... -0.3V to 30V, 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 2 260 C Note1: Must not exceed 8V Note2: o o 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 o = 36 C/W * JA o 20-Lead MLPQ = 4 C/W JC (3x4)mm *Exposed pad on underside is connected to a copper pad through vias for 4-layer PCB board design Ordering Information PKG DESIG PACKAGE PIN COUNT PARTS PER REEL DESCRIPTION M IR3640MTRPbF 20 3000 06/15/2009 2