LX7180A 4A Step-Down Regulator Description Features The LX7180A is a 4A dowstepn - regulator with 0-4 A Step-down Regulator integrated MOSFETs packaged in a space saving Operational Input Supply Voltage Range: QFN12 2 mm x 2 mm for todays mobile devices. It uses 3.0 V - 5.5 V (short durations to 6.5 V) an ultrafas- t, constant frequency hysteretic control Hysteretic Control Offers Best Transient Response method to minimize external filter components while PWM Switching at a Constant 1.65 MHz maintaining excellent regulation. The LX7180A reference Power Save Mode (PSM) can be Selected to voltage is programmable from 0.6 V to 1.195 V through a Improve Light Load Efficiency. high speed (up to 3.4 MHz), bi-directional I2C bus. 100% Duty Ratio Operation The LX7180 operates from 3 V to 5.5 V rails and outputs Input Under Voltage and Over Voltage Protection 0.6 V to 100% of the input voltage. Enable and Power Good Function I2C Serial Interface at 3.4 Mbps Cycle-by-cycle current limiting protects against -over Internal Soft-start current conditions. Hiccup mode provides protection for Cycle-by-Cycle Over Current Protection heavy ov-erload or s-horcirctuit faults. Thermal protection shuts down the regulator under- over Hiccup Mode Protects Against Short Circuit Faults temperature condit ions. Over voltage conditions will Seven Bit Adjustable Reference Voltage via I2C Bus immediately shut off the output to protect against RoHS Compliant permanent damage. The LX7180A automatically restarts when all fault conditions are cleared. Applications High Performance HDD LCD TV Notebook/Netbook Server and Workstations Video Cards PoE Powered Devices Smart Phone SW VIN 0.47 H VOUT 1, 10 2, 11 PVIN SW GND 22 F, X5R 10 F 10 F GND X5R X5R 7 FB LX7180A 8 EN 5 SCL 500 k 6 SDA 9 PG PGND AGND 3, 12 4 PGOOD Figure 1 Typical Application of LX7180A June 2015 Rev. 1.2 www.microsemi.com 1 2015 Microsemi Corporation 4A Step-Down Regulator Pin Configuration and Pinout Figure 2 Pinout Top View Marking: x is the 2LSB bits of the binary I2C slave Address 1 is for the set output voltage YWWL = Year/Week/Lot Code RoHS / Pb-free Matte Tin Pin Finish Ordering Information Slave Set Ambient Packaging Type Package Address Output Part Number Temperature Type Voltage 0 0.9 V LX7180A - 01CLQ LX7180A - 11CLQ 1 LX7180A - 21CLQ Bulk 2 LX7180A - 31CLQ 3 RoHS LX7180A - xyCLQ* QFN 2X2 mm 0C to 85C Compliant, 12L 0 0.9 V LX7180A - 01CLQ-TR Pb-free LX7180A - 11CLQ-TR 1 LX7180A - 21CLQ-TR Tape and Reel 2 LX7180A - 31CLQ-TR 3 LX7180A - xyCLQ-TR* Note: 1. * Consult factory for other I2C slave address and set output voltage options. 2. x is the 2 LSB bits of the binary I2C slave address (0 to 3). 3. y is the set output voltage (0 is 0.6 V, 1 is 0.9 V, 2 is 0.95 V, 3 is 0.97 V). 2