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    The Future of Analog IC Technology DESCRIPTION The MP1495 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 MP1495 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 MP1495 requires a minimal number of readily-available standard external components, and is available in a space-saving 8-pin TSOT23 package. 捷多邦,您值得信赖的PCB打样专家! MP1495 High Efficiency 3A, 16V, 500kHz Synchronous Step Down Converter FEATURES • Wide 4.5V-to-16V Operating Input Range • 80mΩ/30mΩ Low RDS(ON) Internal Power MOSFETs • High-Efficiency Synchronous Mode Operation • Fixed 500kHz Switching Frequency • Synchronizes to a 200kHz to 2MHz External Clock • AAM Power-Save Mode • Internal Soft-Start • OCP Protection and Hiccup • Thermal Shutdown • Output Adjustable from 0.8V • Available in an 8-pin TSOT-23 package APPLICATIONS • Notebook Systems and I/O Power • Digital Set-Top Boxes • Flat-Panel Television and Monitors • 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 4.5V-16V VIN C1 22 EN/ SYNC C3 R3 0.1 90.9k R5 10k 2 IN R4 5 10 BST MP1495 6 EN/SYNC 3 SW C4 L1 7 VCC 1 AAM GND 4 8 FB R1 R9 40.2k 33k R2 13k 3.3V/2A C2 47 Efficiency vs. Load Current VIN=12V, VOUT=3.3V, AAM=0.5V 100 95 90 85 VIN=12V VIN=5V 80 75 VIN=16V 70 0.01 0.1 1 10 LOAD CURRENT(A) MP1495 Rev. 1.04 www.MonolithicPower.com 1 12/26/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. MP1495 – SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number* MP1495DJ Package TSOT-23-8 Top Marking ACS For Tape & Reel, add suffix –Z (e.g. MP1495DJ–Z); For RoHS, compliant packaging, add suffix –LF (e.g. MP1495DJ–LF–Z). PACKAGE REFERENCE ABSOLUTE MAXIMUM RATINGS (1) VIN ..................................................-0.3V to 17V VSW ...................................................................... -0.3V (-5V for <10ns) to 17V (19V for <10ns) VBS ......................................................... VSW+6V All Other Pins ................................ -0.3V to 6V (2) Continuous Power Dissipation (TA = +25°C) (3) ........................................................... 1.25W Junction Temperature ...............................150°C Lead Temperature ....................................260°C Storage Temperature................. -65°C to 150°C Recommended Operating Conditions (4) Supply Voltage VIN ...........................4.5V to 16V Output Voltage VOUT..................... 0.8V to VIN-3V Operating Junction Temp. (TJ). -40°C to +125°C Thermal Resistance (5) θJA θJC TSOT-23-8............................. 100 ..... 55... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) About the details of EN pin’s ABS MAX rating, please refer to Page 9, 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 operating conditions. 5) Measured on JESD51-7, 4-layer PCB. MP1495 Rev. 1.04 www.MonolithicPower.com 2 12/26/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. MP1495 – SYNCHRONOUS STEP-DOWN CONVERTER ELECTRICAL CHARACTERISTICS (6) VIN = 12V, TA = 25°C, unless otherwise noted. Parameter Symbol Condition Min Supply Current (Shutdown) IIN VEN = 0V Supply Current (Quiescent) Iq VEN = 2V, VFB = 1V, AAM=0.5V HS Switch-ON Resistance HSRDS-ON VBST-SW=5V LS Switch-ON Resistance LSRDS-ON VCC =5V Switch Leakage Current Limit (6) SWLKG VEN = 0V, VSW =12V ILIMIT Under 40% Duty Cycle 4.2 Oscillator Frequency fSW VFB=0.75V 440 Fold-Back Frequency fFB VFB<400mV Maximum Duty Cycle DMAX VFB=700mV 90 Minimum ON Time(6) tON_MIN Sync Frequency Range fSYNC 0.2 Feedback Voltage VFB TA =25°C -40°C65% VIN Connect the BST diode from the VCC pin to the BST pin, as shown in Figure 7. BST MP1495 External BST Diode IN4148 VCC CBST SW L COUT Figure 7: Optional External Bootstrap Diode for Enhanced Efficiency The recommended external BST diode is IN4148, and the BST capacitor is 0.1 µF to 1μF. PC Board Layout (8) PCB layout is very important to achieve stable operation especially for VCC capacitor and input capacitor placement. For best results, follow these guidelines: 1) Use large ground plane directly connect to GND pin. Add vias near the GND pin if bottom layer is ground plane. 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) Place the ceramic input capacitor close to IN and GND pins. Keep the connection of input capacitor and IN pin as short and wide as possible. 4) Route SW, BST away from sensitive analog areas such as FB. It’s not recommended to route SW, BST trace under chip’s bottom side. 5) Place the T-type feedback resistor R9 close to chip to ensure the trace which connects to FB pin as short as possible Notes: 8) The recommended layout is based on the Figure 8 Typical Application circuit on the next page. GND C3 R1 R3 C6 C4 SW R9 R2 R4 5 6 7 8 C5 R8 4 3 2 1 R7 R6 R5 C1 C1A L1 Vin C2 Vout GND C2A GND VCC EN/SYNC BST SW GND MP1495 Rev. 1.04 www.MonolithicPower.com 13 12/26/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. MP1495 – SYNCHRONOUS STEP-DOWN CONVERTER TYPICAL APPLICATION CIRCUITS U1 C1A 2 IN NS R4 BST 5 10 7 VCC R7 90.9k MP1495 SW 3 R5 28.7k R8 10k C5 1nF 1 AAM 6 EN/SYNC R9 FB 8 33k R6 11k GND 4 Figure 8: 12VIN, 3.3V/3A C3 R1 15pF 40.2k R3 0 R2 13k 3.3V MP1495 Rev. 1.04 www.MonolithicPower.com 14 12/26/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. PACKAGE INFORMATION MP1495 – SYNCHRONOUS STEP-DOWN CONVERTER TSOT23-8 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. MP1495 Rev. 1.04 www.MonolithicPower.com 15 12/26/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved.

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