MP9943AGQ-P

MP9943A The Future of Analog IC Technology High Efficiency 3A Peak, 36V, Synchronous Step-Down Converter With Power Good DESCRIPTION FEATURES The MP9943A is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in power MOSFETs. It offers a very compact solution to achieve a 3A peak output current with excellent load and line regulation over a wide input supply range. The MP9943A has synchronous mode operation for higher efficiency over the output current load range.  Current-mode operation provides fast transient response and eases loop stabilization.        Full protection features include over-current protection and thermal shutdown. The MP9943A requires a minimal number of readily-available standard external components, and is available in a space-saving QFN-8 (3mmx3mm) package.     Wide 4V to 36V Continuous Operating Input Range 85mΩ/55mΩ Low RDS(ON) Internal Power MOSFETs High-Efficiency Synchronous Mode Operation 410kHz Switching Frequency Synchronizes from 200kHz to 2.2MHz External Clock High Duty Cycle for Automotive Cold-crank Force CCM Mode Power Good Indicator Over Current Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in an QFN-8 (3mmx3mm) package APPLICATIONS    General Consumer Multi-Function Printers (MFP) Distributed Power Systems All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* MP9943AGQ Package QFN-8 (3mmx3mm) Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP9943AGQ–Z). TOP MARKING AQX: product code of MP9943AGQ; Y: year code; LLL: lot number; PACKAGE REFERENCE TOP VIEW FB 1 8 PG VCC 2 7 IN EN/SYNC 3 6 SW BST 4 5 GND QFN-8 (3mmх3mm) MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 2 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN .................................................. -0.3V to 40V VSW .................................................. -0.3V to 41V VBST ........................................................ VSW+6V All Other Pins ................................ -0.3V to 6V (2) (3) Continuous Power Dissipation (TA = +25°C) QFN-8 (3mmx3mm) ................................. 2.27W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature ................. -65°C to 150°C QFN-8 (3mmx3mm) ............... 55 ...... 13... °C/W Recommended Operating Conditions (4) Continuous Supply Voltage VIN ........... 4V to 36V Output Voltage VOUT .................. 0.8V to DMaxхVIN Operating Junction Temp (TJ). . -40°C to +125°C (5) θJA θJC Notes: 1) Absolute maximum ratings are rated under room temperature unless otherwise noted. Exceeding these ratings may damage the device. 2) About the details of EN/SYNC pin’s ABS MAX rating, please refer to page 12, Enable/SYNC control section. 3) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 4) The device is not guaranteed to function outside of its operation condition. 5) Measured on JESD51-7, 4-layer PCB. MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS VIN = 12V, TJ = +25°C, unless otherwise noted. Parameter Symbol Supply Current (Shutdown) ISHDN Supply Current (Quiescent) IQ HS Switch-ON Resistance Condition Min Typ VEN = 0V Max Units 8 μA VEN = 2V, VFB = 1V 0.5 0.7 mA RON_HS VBST-SW=5V 85 105 mΩ LS Switch-ON Resistance RON_LS VCC =5V 55 75 mΩ Switch Leakage ILKG_SW VEN = 0V, VSW =12V 1 μA Current Limit ILIMIT Oscillator Frequency fSW Fold-Back Frequency Maximum Duty Cycle fFB DMAX Minimum ON Time(6) tON_MIN Under 40% Duty Cycle 4 5.5 7 A VFB=750mV 320 410 500 kHz VFB65% VIN Notes: 8) The recommended layout is based on the Figure 8 Typical Application circuit on page 18. In these cases, add an external BST diode from the VCC pin or VOUT to BST pin, as shown in Figure 6. Top Layer Figure 6: Optional External Bootstrap Diode to Enhance Efficiency The recommended external BST diode is 1N4148, and the BST capacitor value is 0.1µF to 1μF. PCB Layout(8) PCB layout, especially the input capacitor and VCC capacitor placement, is very important to achieve stable operation. For the best results, follow these guidelines: 1) Place the ceramics input capacitor as close to IN and GND pins as possible, especially the small package size (0603) input bypass capacitor. Keep the connection of input capacitor and IN pin as short and wide as possible. 2) Place the VCC capacitor to VCC pin and GND pin as close as possible. Make the trace length of VCC pin-VCC capacitor anode-VCC capacitor cathode-chip GND pin as short as possible. 3) Use large ground plane directly connect to GND pin. Add vias near the GND pin if bottom layer is ground plane. 4) Route SW, BST away from sensitive analog areas such as FB. 5) Place the T-type feedback resistor close to chip to ensure the trace which connects to FB pin as the short as possible. Bottom Layer Figure 7: Recommended PCB Layout MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 16 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER Design Example Below is a design example following the application guidelines for the specifications: Table 2: Design Example VIN VOUT IOUT 12V 5V 3A Peak The detailed application schematic is shown in Figure 8. The typical performance and circuit waveforms have been shown in the Typical Performance Characteristics section. For more device applications, please refer to the related Evaluation Board Datasheets. MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 17 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER TYPICAL APPLICATION CIRCUITS Figure 8: 12VIN, 5V/3A Peak Output Figure 9: 12VIN, 3.3V/3A Peak Output MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 18 MP9943A – 36V, 3A PEAK SYNCHRONOUS STEP-DOWN CONVERTER PACKAGE INFORMATION QFN-8 (3mm x 3mm) NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP9943A Rev. 1.1 www.MonolithicPower.com 9/1/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 19