MPQ4423GQ-Z

MPQ4423 High Efficiency 3A, 36V, Synchronous Step Down Converter AEC-Q100 Qualified DESCRIPTION FEATURES The MPQ4423 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 continuous output current with excellent load and line regulation over a wide input supply range. The MPQ4423 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 shut down. The MPQ4423 requires a minimal number of readily-available standard external components, and is available in a space-saving QFN-8 (3mmx3mm) package.               Wide 4V to 30V Continuous Operating Input Range 36V Input Transient Tolerance for Automotive Load Dump 85mΩ/55mΩ Low RDS(ON) Internal Power MOSFETs High-Efficiency Synchronous Mode Operation Default 410kHz Switching Frequency Synchronizes to a 200kHz to 2.2MHz External Clock High Duty Cycle for Automotive Cold-crank Power-Save Mode Internal Soft-Start Power Good OCP Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in an QFN-8 (3mmx3mm) Available in AEC-Q100 Grade 1 APPLICATIONS    Automotive Industrial Control System Distributed Power Systems All MPS parts are lead-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 MPQ4423 Rev.1.0 5/17/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 1 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* MPQ4423GQ MPQ4423GQ-AEC1 Package QFN-8 (3mmx3mm) QFN-8 (3mmx3mm) Top Marking See Below * For Tape & Reel, add suffix -Z (e.g. MPQ4423GQ-Z); TOP MARKING AJV: product code of MPQ4423GQ and MPQ4423GQ-AEC1; 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 QFN8 (3mmx3mm) MPQ4423 Rev.1.0 5/17/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 2 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) VIN ................................................ -0.3V to 40V VSW ................................................ -0.3V to 41V VBS ....................................................... VSW+6V All Other Pins ................................ -0.3V to 6V (2) Continuous Power Dissipation (TA = +25°C) (3) 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 Continuous Supply Voltage VIN .......... 4V to 30V Output Voltage VOUT................... 0.8V to 0.9xVIN Operating Junction Temp. (TJ). -40°C to +125°C MPQ4423 Rev.1.0 5/17/2018 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 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) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 3 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TJ=+25°C. Parameter Symbol Supply (Shutdown) Current Supply (Quiescent) Current HS Resistance Switch-ON ISHDN Min Typ Max Units 8 μA VEN = 0V VEN = 2V, VFB = 1V 0.5 0.7 mA RON_HS VBST-SW =5V 85 150 mΩ LS Switch-ON Resistance RON_LS VCC =5V 55 105 mΩ Switch Leakage ILKG_SW VEN = 0V, VSW =12V 1 μA Current Limit IQ Condition ILIMIT Under 40% Duty Cycle 3.2 4.4 5.7 A Oscillator Frequency fSW VFB=750mV 320 410 500 kHz Fold-Back Frequency fFB VFB65%). A power supply between 2.5V and 5V can be used to power the external bootstrap diode and VCC or VOUT is the good choice of this power supply in the circuit as shown in Figure 6. Selecting the Output Capacitor The output capacitor (C2) maintains the DC output voltage. Use ceramic, tantalum, or lowESR electrolytic capacitors. For best results, use low ESR capacitors to keep the output voltage ripple low. The output voltage ripple can be estimated by: VOUT  VOUT  VOUT  1 fS  L1  VIN MPQ4423 Rev.1.0 5/17/2018    1     RESR  8  f  C2   S  Figure 6: Optional External Bootstrap Diode to Enhance Efficiency www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 15 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER The recommended external BST diode is IN4148, and the BST capacitor value is 0.1µF to 1μF. PCB Layout 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. Bottom Layer Figure 7: Recommended PCB Layout 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. Top Layer MPQ4423 Rev.1.0 5/17/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 16 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER TYPICAL APPLICATION CIRCUITS Figure 8: 3.3V Output Typical Application Circuit MPQ4423 Rev.1.0 5/17/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 17 MPQ4423 – 36V, 3A SYNCHRONOUS STEP-DOWN CONVERTER PACKAGE INFORMATION QFN-8 (3mm x 3mm) PIN 1 ID 0.15x45° TYP. PIN 1 ID MARKING PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW 0.15x45° NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) JEDEC REFERENCE IS MO-220. 5) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN 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. MPQ4423 Rev.1.0 5/17/2018 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. 18