MP4420GJ-Z

MP4420 High Efficiency 2A, 36V, Synchronous Step Down Converter The Future of Analog IC Technology DESCRIPTION FEATURES The MP4420 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 2A continuous output current with excellent load and line regulation over a wide input supply range. The MP4420 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 MP4420 requires a minimal number of readily-available standard external components, and is available in a space-saving 8-pin TSOT23 package. Wide 4V to 30V Continuous Operating Input Range 36V Input Transient Tolerance for Automotive Load Dump 90mΩ/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 8-pin TSOT-23 package 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 2 VIN 1 C3 0.1 F MP4420 Rev.1.0 8/5/2014 R4 20 C4 100nF L1 MP4420 6 EN/SYNC BST 5 IN C1 22 F EN/SYNC SW 3 PG 7 VCC GND 4 FB 8 10 H R3 51k R1 41.2k 3.3V/2A C2 47 F VOUT R2 13k www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 1 MP4420 – 36V, 2A SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* MP4420GJ Package TSOT23-8 Top Marking See Below * For Tape & Reel, add suffix –Z (e.g. MP4420GJ–Z); TOP MARKING AFP: product code of MP4420GJ Y: year code; PACKAGE REFERENCE TOP VIEW PG 1 8 FB IN 2 7 VCC SW 3 6 EN/SYNC GND 4 5 BST TSOT23-8 MP4420 Rev.1.0 8/5/2014 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 2 MP4420 – 36V, 2A SYNCHRONOUS STEP-DOWN CONVERTER ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance VIN ................................................ -0.3V to 40V VSW ................................................ -0.3V to 41V VBS ....................................................... VSW+6V All Other Pins ................................ -0.3V to 6V (2) (3) Continuous Power Dissipation (TA = +25°C) TSOT23-8 ................................................ 1.25W Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C Storage Temperature ................. -65°C to 150°C TSOT23-8 ............................. 100 ..... 55 ... °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 MP4420 Rev.1.0 8/5/2014 (4) 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 14, 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. © 2014 MPS. All Rights Reserved. 3 MP4420 – 36V, 2A 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 90 105 mΩ LS Switch-ON Resistance RON_LS VCC =5V 55 75 mΩ Switch Leakage ILKG VEN = 0V, VSW =12V 1 μA Current Limit SW ILIMIT Oscillator Frequency fSW Fold-Back Frequency fFB Maximum Duty Cycle DMAX (5) Minimum ON Time tON Under 40% Duty Cycle 3.2 4.2 5.3 A VFB=750mV 320 410 500 kHz 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. 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. VCC 7 External BST diode 1N4148 BST 5 VCC/VOUT RBST SW 3 CBST L VOUT COUT Top Layer Figure 6: Optional External Bootstrap Diode to Enhance Efficiency 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. MP4420 Rev.1.0 8/5/2014 Bottom Layer Figure 7: Recommended PCB Layout www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 18 MP4420 – 36V, 2A SYNCHRONOUS STEP-DOWN CONVERTER TYPICAL APPLICATION CIRCUITS Figure 8: 3.3V Output Typical Application Circuit MP4420 Rev.1.0 8/5/2014 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 19 MP4420 – 36V, 2A SYNCHRONOUS STEP-DOWN CONVERTER PACKAGE INFORMATION TSOT23-8 RECOMMENDED LAND PATTERN TOP VIEW SEATING PLANE SEE DETAIL ’’A’’ FRONT VIEW SIDE VIEW NOTE: DETAIL ’’A’’ 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) JEDEC REFERENCE IS MO-193, VARIATION BA. 6) DRAWING IS NOT TO SCALE. 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. MP4420 Rev.1.0 8/5/2014 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2014 MPS. All Rights Reserved. 20