1、 MP1471 High-Efficiency, 3A Peak, 16V, 500kHz Synchronous, Step-Down Converter In a 6-Pin TSOT 23 MP1471 Rev. 1.01 www.MonolithicP 1 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2013 MPS. All Rights Reserved. The Future of Analog IC Tech
2、nologyDESCRIPTION The MP1471 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. It offers a very compact solution to achieve a 3A peak output current over a wide input supply range, with excellent load and line regulation. The MP1471 has synchr
3、onous-mode operation for higher efficiency over the output current-load range. Current-mode operation provides fast transient response and eases loop stabilization. Protection features include over-current protection and thermal shutdown. The MP1471 requires a minimal number of readily-available, st
4、andard, external components and is available in a space-saving 6-pin TSOT23 package. FEATURES Wide 4.7V-to-16V Operating Input Range 150m/70m Low-RDS(ON) Internal Power MOSFETs Proprietary Switching-LossReduction Technology High-Efficiency Synchronous-Mode Operation Fixed 500kHz Switching Frequency
5、Internal AAM Power-Save Mode for High Efficiency at Light Load Internal Soft-Start Over-Current Protection and Hiccup Thermal Shutdown Output Adjustable from 0.8V Available in a 6-pin TSOT-23 package APPLICATIONS Game Consoles Digital Set-Top Boxes Flat-Panel Television and Monitors General Purposes
6、 All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, please visit MPS website under Products, Quality Assurance page.“MPS” and “The Future of Analog IC Technology” are registered trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION VINR213kR140.2kR340.2kIN
7、U1GNDMP147114VOUT2635EN FBSWBST3.3VENGND505560657075808590951000.01 0.1 1 10MP1471 SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS MP1471 Rev. 1.01 www.MonolithicP 2 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2013 MPS. All Right
8、s Reserved. ORDERING INFORMATION Part Number* Package Top Marking MP1471GJ TSOT23-6 AEJ * For Tape PACKAGE REFERENCE MP1471GNDSWIN123654BSTENFBTOP VIEWABSOLUTE MAXIMUM RATINGS (1)VIN-0.3V to 17V VSW-0.3V (-5V for 65% Connect the external BST diode from the output of voltage regulator to the BST pin,
9、 as shown in Figure 7. Figure 7 : Optional External Bootstrap Diode For most applications, use an IN4148 for the external BST diode is IN4148, and a 1F capacitor for the BST capacitor. PC Board Layout PCB layout is very important to achieve stable operation. For best results, use the following guide
10、lines and Figure 8 as reference. 1) Keep the connection between the input ground and GND pin as short and wide as possible. 2) Keep the connection between the input capacitor and IN pin as short and wide as possible. 3) Use short and direct feedback connections. Place the feedback resistors and comp
11、ensation components as close to the chip as possible. 4) Route SW away from sensitive analog areas such as FB. C1C6R1R2R7R6 C5R4C3R5123456VINGNDC3R3C1C1AC6R8R1R2R7C7R3C3R6 C5R4C4R5123456VINGNDFigure 8: Sample Layout MP1471 SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS MP1471 Rev. 1.01 www.M
12、onolithicP 14 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2013 MPS. All Rights Reserved. Design Example Below is a design example following the application guidelines for the specifications: Table 2Design Example VIN12V VOUT3.3V Io 2.5A
13、 The detailed application schematic is shown in Figure 9. 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. MP1471 SYNCHRONOUS, STEP-DOWN CONVERTER W
14、ITH INTERNAL MOSFETS MP1471 Rev. 1.01 www.MonolithicP 15 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2013 MPS. All Rights Reserved. TYPICAL APPLICATION CIRCUITS C125VGNDGNDGND GNDGNDGNDGNDENVOUTVIN100kR5NSR60R4C4C2AC2NSC3L1SWNSR340.2KR1
15、7.68KR2GNDGND GNDGND24.9KR75VNSC525VC6MP147135624BSTSWINGNDFBEN1Figure 9: 12VIN, 5V/2.5A C125VGNDGNDGND GNDGNDGNDGNDENVOUTVIN100kR5NSR60R4C4C2AC2NSC3L1SWNSR340.2KR113KR2GNDGND GNDGND40.2KR73.3VNSC525VC6MP147135624BSTSWINGNDFBEN1Figure 10: 12VIN, 3.3V/3A C125VGNDGNDGND GNDGNDGNDGNDENVOUTVIN100kR5NSR6
16、0R4C4C2AC2NSC3L1SWNSR340.2KR119.1KR2GNDGND GNDGND59KR72.5VNSC525VC6MP147135624BSTSWINGNDFBEN1Figure 81: 12VIN, 2.5V/3A MP1471 SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS MP1471 Rev. 1.01 www.MonolithicP 16 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and
17、 Duplication Prohibited. 2013 MPS. All Rights Reserved. C125VGNDGNDGND GNDGNDGNDGNDENVOUTVIN100kR5NSR60R4C4C2AC2NSC3L1SWNSR340.2KR132.4KR2GNDGND GNDGND75KR71.8VNSC525VC6MP147135624BSTSWINGNDFBEN1Figure 92: 12VIN, 1.8V/3A C125VGNDGNDGND GNDGNDGNDGNDENVOUTVIN100kR5NSR60R4C4C2AC2NSC3L1SWNSR320.5KR141.2
18、KR2GNDGND GNDGND120KR71.2VNSC525VC6MP147135624BSTSWINGNDFBEN1Figure 103: 12VIN, 1.2V/3A MP1471 SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Propert
19、y rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP1471 Rev. 1.01 www.MonolithicP 17 8/27/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
20、2013 MPS. All Rights Reserved. PACKAGE INFORMATION TSOT23-6 FRONT VIEWNOTE: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) S
21、HALL BE 0.10 MILLIMETERS MAX.5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AB.6) DRAWING IS NOT TO SCALE.7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK)TOP VIEW RECOMMENDED LAND PATTERNSEATING PLANESIDE VIEWDETAIL “A“SEE DETAIL AIAAAAPIN 1 IDSee note 7EXAMPLE TOP MARK
