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IR3531A Datasheet(PDF) 1 Page - International Rectifier |
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IR3531A Datasheet(HTML) 1 Page - International Rectifier |
1 / 39 page 4+1 Phase Dual Output Control IC IR3531A March 22, 2012 | FINAL | V1.11 1 FEATURES Integrated 6.8V/0.8A Buck Regulator provides bias to Control and Driver IC(s) Adjustable switching frequency from 250 KHz up to 1.5MHz per phase based on the synchronization SCLK input Sink and source tracking capability Margining via SVID for both rails Pre-bias compatible Soft Stop capability 0.5% overall system set point accuracy Voltage Mode Modulation for excellent transient performance Single NTC thermistor for current reporting, OC Threshold, and Load Line thermal compensation Complete protection including over-current, over-voltage, over-temperature, open remote sense and open control loop Thermally enhanced 48L 7mm x 7mm MLPQ package RoHS compliant BASIC APPLICATION CIRCUIT Figure 1: IR3531A Basic Application Circuit, showing a 4+1 Configuration DESCRIPTION The IR3531A control IC provides all the necessary control, communication and protection to support compact dual output power solutions up to 210W. The IR3531A can be combined with either discrete IR3535 driver ICs and Direct Fets TM or our IR35XX family of footprint compatible and scalable PowIRstages TM which integrate the MOSFETs and driver into the same package. The IR3531A provides overall system control and current sharing while the Driver IC or power stages senses per- phase current locally and communicates it to the Control IC. The IR3531A has tri-state PWM outputs to allow diode emulation during light load events. The IR3531A provides a high performance transient solution through classic voltage mode control and Body Braking TM. Body BrakingTM automatically turns off the low- side MOSFET to help dissipate stored inductor energy at load turn-off. PIN DIAGRAM IR3531A 48 Pin 7 x 7 MLPQ Top View 49 GND 48 47 46 45 44 43 42 41 40 39 EN VRHOT# VRRDY1 VRRDY VCC SW V12V ALERT# VCLK VDIO PHSSHED IMON_R1 1 2 3 4 5 6 7 8 9 10 11 12 BBR1# PWM4 PWM3 TSENS ROSC/OVP ADDR ICCP SCLK PWM2 PWM1 BBR# TRACK 36 35 34 33 32 31 30 29 28 27 26 25 38 37 13 14 15 16 17 18 19 20 21 22 23 24 Figure 2: IR3531A Package Top View A |
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