NCP81158 Synchronous Buck MOSFET Driver The NCP81158 is a highperformance dual MOSFET gate driver in a small 3 mm x 3 mm package, optimized to drive the gates of both highside and lowside power MOSFETs in a synchronous buck www.onsemi.com converter. The driver outputs can be placed into a highimpedance state via the tristate PWM and EN inputs. The NCP81158 comes packaged with an integrated boost diode to minimize external MARKING components. A VCC UVLO function guarantees the outputs are low DIAGRAM when the supply voltage is low. 1 8 1 Features 81158 DFN8 ALYW Spaceefficient 3 mm x 3 mm DFN8 thermallyenhanced Package CASE 506BJ VCC Range of 4.5 V to 5.5 V Internal Bootstrap Diode 81158 = Specific Device Code A = Assembly Location 5 V 3stage PWM Input L = Wafer Lot Diode Braking Capability via EN Midstate Y = Year Adaptive Anticross Conduction Circuit Protects Against W = Work Week = PbFree Package Crossconduction during FET Turnon and Turnoff (Note: Microdot may be in either location) Output Disable Control Turns Off Both MOSFETs via Enable Pin VCC Undervoltage Lockout These Devices are Pbfree, Halogenfree/BFRfree and are RoHS PINOUT DIAGRAM Compliant BST 1 8 DRVH Typical Applications Power Solutions for Notebook and Desktop Systems PWM 2 7 SW FLAG 9 EN 3 6 GND VCC45 DRVL ORDERING INFORMATION Device Package Shipping NCP81158MNTXG DFN8 3000 / Tape & (PbFree) Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: August, 2016 Rev. 0 NCP81158/DNCP81158 BST VCC DRVH PWM Logic SW AntiCross Conduction VCC DRVL EN ZCD Detection UVLO Figure 1. Block Diagram PIN DESCRIPTIONS Pin No. Symbol Description 1 BST Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin and the SW pin. 2 PWM Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode Emulation Enabled, High = High Side FET Enabled. 3 EN Logic input. A logic high to enable the part and a logic low to disable the part. Three states logic input: EN = High to enable the gate driver EN = Low to disable the driver EN = Mid to go into diode mode (both high and low side gate drive signals are low) 4 VCC Power supply input. Connect a bypass capacitor (0.1 F) from this pin to ground. 5 DRVL Low side gate drive output. Connect to the gate of low side MOSFET. 6 GND Bias and reference ground. All signals are referenced to this node. 7 SW Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET. 8 DRVH High side gate drive output. Connect to the gate of high side MOSFET. 9 FLAG Thermal flag. There is no electrical connection to the IC. Connect to ground plane. www.onsemi.com 2