NCP81166MNTBG

NCP81166, NCP81166A Synchronous Buck MOSFET Drivers The NCP81166/A is a high performance dual MOSFET gate driver optimized to drive the gates of both high−side and low−side power MOSFETs in a synchronous buck converter. 2mm x 2mm DFN8 package allows for space−optimized board layout. Zero current detect feature allows for a high−efficiency solution even at light load conditions. Pre−OVP feature aids in protecting the load in the event of a short across the high−side FET. VCC UVLO ensures the MOSFETs are off when supply voltages are low. A bi−directional Enable pin provides a fault signal to the controller when a pre−OVP or UVLO fault is detected. http://onsemi.com 1 DFN8 MN SUFFIX CASE 506CN Features • • • • • • • • • • • • Space−Efficient 2 mm x 2mm DFN8 Thermally−Enhanced Package VCC Range of 4.5 V to 13.2 V Integrated Bootstrap Diode Pre−OVP Function Protects Load during HS FET Short ♦ NCP81166: 2.25 V SW Trip Threshold ♦ NCP81166A: 1.8 V SW Trip Threshold Zero Current Detect Function Provides Power Saving Operation during Light Load Conditions Bi−directional Enable Feature pulls Enable pin low during pre−OVP and UVLO Faults 5 V tri−state PWM Logic Adaptive Anti−Cross−Conduction Circuit Protects against Cross−Conduction during FET turn−on and turn−off Output Disable Control turns off both MOSFETs via Enable pin VCC Undervoltage Lockout Direct interface to ASP1252, ASP1400 and other compatible PWM Controllers These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Typical Applications • Power Solutions for Desktop Systems © Semiconductor Components Industries, LLC, 2015 January, 2015 − Rev. 2 1 MARKING DIAGRAM 1 XXMG G XX = Specific Device Code CE for NCP81166 CH for NCP81166A M = Date Code G = Pb−Free Device (Note: Microdot may be in either location) ORDERING INFORMATION Device Package Shipping† NCP81166MNTBG DFN8 (Pb−Free) 3000 / Tape & Reel NCP81166AMNTBG DFN8 (Pb−Free) 3000 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. Publication Order Number: NCP81166/D NCP81166, NCP81166A PWM BST 1 NC DRVH GND 9 EN SW VCC DRVL (Top View) Figure 1. Pin Diagram BST VCC DRVH PWM Logic SW Anti−Cross Conduction VCC DRVL EN Fault ZCD Detection UVLO Pre−OV Figure 2. Block Diagram Table 1. Pin Descriptions Pin No. Symbol Description 1 PWM Control input. The PWM signal has three distinctive states: Low = Low Side FET Enabled, Mid = Diode Emulation Enabled, High = High Side FET Enabled. 2 NC No connect. There is no electrical connection from this pin to the die. Externally connecting this pin to ground will not affect the functionality of the part. 3 EN Logic input. A logic high to enable the part and a logic low to disable the part. Pin is internally pulled low during pre−OVP and UVLO faults. 4 VCC Power supply input. Connect a bypass capacitor (1 mF) from this pin to ground. 5 DRVL Low side gate drive output. Connect to the gate of low side MOSFET. 6 SW 7 DRVH 8 BST Floating bootstrap supply pin for high side gate driver. Connect the bootstrap capacitor between this pin and the SW pin. 9 GND Bias and reference ground. All signals are referenced to this node. Switch node. Connect this pin to the source of the high side MOSFET and drain of the low side MOSFET. High side gate drive output. Connect to the gate of high side MOSFET. http://onsemi.com 2 NCP81166, NCP81166A 12V_POWER TP1 R164 R1 1.02 C4 TP2 0.0 R143 NCP81166/A TP3 0.0 TP4 PWM BST HG PWM SW DRON EN LG C1 4.7uF C2 4.7uF + CE9 390uF 0.0 VREG_SW1_HG TP5 VCCP L VREG_SW1_OUT 235nH TP6 TP7 Q9 NTMFS4851N VREG_SW1_LG Q10 NTMFS4851N R3 2.2 JP13_ETCH CSN11 PAD TP8 C5 1uF C3 4.7uF R142 GND VCC Q1 NTMFS4821N 0.027uF C6 2700pF JP14_ETCH CSP11 Figure 3. Application Circuit Table 2. ABSOLUTE MAXIMUM RATINGS Pin Symbol Pin Name VMAX VMIN VCC Main Supply Voltage Input 15 V −0.3 V BST Bootstrap Supply Voltage 35 V wrt/ GND 40 V ≤ 50 ns wrt/ GND 15 V wrt/ SW −0.3 V wrt/SW SW Switching Node (Bootstrap Supply Return) 35 V 40 V ≤ 50 ns −5 V −10 V (200 ns) DRVH High Side Driver Output BST+0.3 V −0.3 V wrt/SW −2 V (