AN_SY8303_大电流3A40V同步降压芯片

SY8303 特性 4.5V-40V输入电压 内部集成低内阻MOS管 开关频率500K-2.5MHZ 3A电流输出 输出精度1.5% 低静态电流

Applications Note: SY8303High Efficiency Fast Response, 3A, 40V Input Synchronous Step Down RegulatorPreliminary SpecificationGeneral DescriptionThe SY8303 develops a high efficiency synchronous step-down DC-DC converter capable of delivering 3A load current. The SY8303 operates over a wide input voltage range from 4.5V to 40V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. The SY8303 adopts peak current control scheme. The switching frequency is adjustable from 500kHz to 2.5MHz using an external resistor. The device also features ultra low quiescent operating to achieve high efficiency under light load. And the internal soft-start limits inrush current during power on. SY8303 is available in TSOT23-8 package.Features Low RDS(ON) for internal switches (top/bottom): 110/70 m 4.5-40V input voltage range Internal compensation Internal 1ms soft-start limits the inrush current Adjustable switching frequency range: 500kHz to 2.5MHz 3A output current capability 1.5% 0.6V reference Low quiescent current Cycle-by-cycle peak current limitation Short circuit protection Thermal shutdown and auto recovery RoHS Compliant and Halogen Free Compact package: TSOT23-8Ordering InformationSY8303 □(□□)□ Tempera ture Code Packa ge Code Optiona l Spec CodeApplications LCD-TV SetTop Box Notebook Storage High Power AP Router NetworkingOrdering Number SY8303AICPackage type TSOT23-8Note --Typical ApplicationsFigure 1. Schematic DiagramFigure 2. Efficiency vs. Load CurrentAN_SY8303 Rev. 0.1Silergy Corp. Confidential- Prepared for Customer Use Only1深圳昱灿电子专业电源管理芯片 DCDC升压 降压 LDO 锂电池充电等 联系人：李先生

SY8303 特性 4.5V-40V输入电压 内部集成低内阻MOS管 开关频率500K-2.5MHZ 3A电流输出 输出精度1.5% 低静态电流

SY8303Pinout (top view)FB FS GND GND 1 2 3 4 8 7 6 5 EN BS LX INTop Mark:Pin Name FB FS Pin Number 1 2EN GND IN LX BS8 3,4 5 6 7XDxyz (Device code: XD, x=year code, y=week code, z= lot number code) Pin Description Output feedback pin. Connect this pin to the center point of the output resistor pider (as shown in Figure 1) to program the output voltage: VOUT=0.6*(1+R1/R2) Frequency programming pin. Connect a resistor to ground to program a switching frequency between 500kHz to 2.5MHz. The switching frequency equals to: Fsw=105/RFS kHz, where RFS is in k . Enable control. Pull high to turn on. Do not float. Ground pin. Input pin. Decouple this pin to GND pin with at least 4.7uF ceramic cap. Inductor pin. Connect this pin to the switching node of inductor. Boot-strap pin. Supply high side gate driver. Decouple this pin to LX pin with 0.1uF ceramic cap.(Note 1) IN to GND ----------------------------------------------------------------------------------------------- -0.3V to 42V LX, FB, EN, FS to GND------------------------------------------------------------------------------------------ -0.3V to 42V BS-LX ------------------------------------------------------------------------------------------- 4V Power Dissipation, PD @ T A = 25°C TSOT23-8 ------------------------------------------------------------ TBD Package Thermal Resistance (Note 2) θ JA -------------------------------------------------------------------------------------------------------------------- TBD θ JC -------------------------------------------------------------------------------------------------------------------- TBD Junction Temperature Range ------------------------------------------------------------------------------------------------ 150°C Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C Storage Temperature Range -------------------------------------------------------------------------------------- -65°C to 150°C (Note 3) Supply Input Voltage -------------------------------------------------------------------------------------------------- 4.5V to 40V Junction Temperature Range ------------------------------------------------------------------------------------- -40°C to 125°C Ambient Temperature Range -------------------------------------------------------------------------------------- -40°C to 85°CAbsolute Maximum RatingsRecommended Operating ConditionsAN_SY8303 Rev. 0.1深圳昱灿电子Silergy Corp. Confidential- Prepared for Customer Use Only专业电源管理芯片 DCDC升压 降压 LDO 锂电池充电等 联系人：李先生2

SY8303 特性 4.5V-40V输入电压 内部集成低内阻MOS管 开关频率500K-2.5MHZ 3A电流输出 输出精度1.5% 低静态电流

SY8303Electrical Characteristics(VIN = 12V, VOUT = 5V, COUT = 47uF, TA = 25°C, IOUT = 1A unless otherwise specified)Parameter Input Voltage Range Quiescent Current Shutdown Current Feedback Reference Voltage FB Input Current Top FET RON Bottom FET RON Top FET Current Limit EN Low threshold EN High Threshold Input UVLO threshold UVLO hysteresis Oscillator Frequency Program Range Oscillator Frequency Accuracy Soft-start Time Min ON Time Min OFF Time Thermal Shutdown Temperature Thermal Shutdown HysteresisSymbol VIN IQ ISHDN VREF IFB RDS(ON)1 RDS(ON)2 ILIM,TOP VENL VENH VUVLO VHYS FOSCTest Conditions IOUT=0, VFB=VREF*105% EN=0Min 4.5Typ0.591 VFB=VCC -501 0.6Max 40 12 2 0.609 50Unit V µA µA V nA m m A V V V V MHz %FOSC ms ns ns °C °C110 70 4 0.8 6.8 1.5 4.2 RFS=200k -15 0.2 0.5 15 1 80 120 150 15TSSTSD TSD,HYSNote 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Note 2: θ JA is measured in the natu …… 此处隐藏：10884字，全部文档内容请下载后查看。喜欢就下载吧 ……