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B6286Z 型号SB6284 2A 输入电压范围2V-24V 输出高达28V升压IC

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标    签:输出高达28V升压ICSB6284

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文档简介

B6286Z 型号SB6284 2A 输入电压范围2V-24V 升压IC

型号:升压IC  牌子:SHOUDING首鼎   封装:SOT23-6

 SB6284是一款固定频率,SOT23-6封装的电流模式升压变换器,高达1.2MHz的工作频率使得外围电感电容可以选择更小的规格。内置软启动功能减小了启动冲击电流。轻载时自动切换至PFM模式。SB6284 包含了输入欠压锁定,电流限制以及过热保护功能。小尺寸的封装给PCB省下更多的空间。 

●  集成0.8欧姆的高压功率MOSFET

● 内部4A的开关电流限制

● 2V-24V的输入电压,VFB:0.6V

●  1.2MHz 固定工作频率

● 输出电流2A  

● 内部补偿功能     

● 输出电压高达28V

● 轻负载条件下,能进行自动脉冲调制。

●  效率高达97% 

特性

◆输入电压范围:2V to 24V ◆输出电压范围:Vin to 28V ◆开关频率:1.2MHz◆SOT-23-6L封装

应用 ◆电池供电设备 ◆便携式DVD ◆移动电源 ◆通讯设备 ◆数码产品 ◆机顶盒 ◆3G网络产品 ◆LCD液晶屏背光电路 ◆ADSL和电缆调制解调器和路由器 ◆PCI Express插槽供电

文档预览

Shouding FEATURES • Integrated 80mΩ Power MOSFET • 2V to 24V Input Voltage • 1.2MHz Fixed Switching Frequency • Internal 4A Switch Current Limit • Adjustable Output Voltage • Internal Compensation • Up to 28V Output Voltage • Automatic Pulse Frequency Modulation Mode at Light Loads SB6284 • up to 97% Efficiency • Available in a 6-Pin SOT23-6 Package APPLICATIONS • Battery-Powered Equipment • Set-Top Boxed • LCD Bais Supply • DSL and Cable Modems and Routers • Networking cards powered from PCI or PCI express slots SSBB62682484 High Efficiency 1.2MHz 2A Step Up Converter GENERAL DESCRIPTION The SDBB6268248 iTshae cSoBn6s2ta8n4t friseqauecnocnys,ta6n-tpifnreSquOeTn2c3y, current mode step-up converter intended for small, low power applications. The SB6284 uswitches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life. The SB6284TfheeatSuBre6s2a8u4tofemaatuticresshifting to pulse frequency modulation mode at light loads. The SB6284incSlBud6e2s84 unindcelrude-vsoltaungederlockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The SB6284isSBa6v2a8i4labilse ainvaialabslemainll a6-psinmaSll OT-23 package. TYPICAL APPLICATION Efficiency Efficiency (%) Iout (mA) Figure 1. Basic Application Circuit Figure 2. Efficiency Curve SD.15 www.shouding.net 1 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding SB6284 ABSOLUTE MAXIMUM RATINGS IN, EN voltages ………..….…… -0.3V to 26V Operating Temperature….... -40°C to +85°C FB Voltages ................................-0.3V to 6V Junction Temperature ………………...160°C SW Voltage ……………………..-0.3V to 30V Storage Temperature Range -65°C to 150°C Peak SW Sink and Source Current ………4A Lead Temperature (Soldering, 10s) ...+300°C PACKAGE/ORDER INFORMATION SW 1 6 NC GND 2 5 IN FB 3 PIN DESCRIPTION SOSOTT2233--56 (S(MBT63254804)) 4 EN PIN NAME FUNCTION 1 SW Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power inductor and output rectifier to SW. SW can swing between GND and 28V. 2 GND Ground Pin 3 FB Feedback Input. The FB voltage is 0.6V. Connect a resistor divider to FB. Regulator On/Off Control Input. A high input at EN turns on the converter, and a 4 EN low input turns it off. When not used, connect EN to the input supply for automatic startup. 5 IN Input Supply Pin. Must be locally bypassed. 6 NC SNBC6284 SD.15 www.shouding.net 2 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding ELECTRICAL CHARACTERISTICS SB6284 (VIN=VEN=5V, TA = 25°C, unless otherwise noted.) Parameter Conditions Operating Input Voltage Under Voltage Lockout Under Voltage Lockout Hysteresis Current (Shutdown) VEN= 0V Quiescent Current (PFM) VFB=0.7V,No switch Quiescent Current (PWM) VFB=0.5V,switch Switching Frequency Maximum Duty Cycle VFB = 0V EN Input High Voltage MIN TYP MAX unit 2 24 V 1.98 V 100 mV 0.1 1 µA 100 200 µA 1.6 2.2 mA 1.2 MHz 90 % 1.5 V EN Input Low Voltage 0.4 V FB Voltage 0.588 0.6 0.612 V FB Input Bias Current SW On Resistance (1) VFB = 0.6V -50 -10 nA 80 150 mΩ SW Current Limit (1) VIN= 5V, Duty cycle=50% 4 A SW Leakage VSW = 20V 1 μA Thermal Shutdown 155 ℃ Note: 1) Guaranteed by design, not tested. SD.15 www.shouding.net 3 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding SB6284 OPERATION TSheB6284 usesSBa6f2ix8e4d furesequseancfyix,epdeafrkeqcuuernrecnyt, peak cuTrhreentoutput voltage of the error amplifier the power mode boost regulator architecture to regulate MOSFET is turned off. The voltage at the output of voltage at the feedback pin. The operation of the the error amplifier is an amplified version of the SB6284 cSaBn6b2e84uncdaenrsbtoeoudnbdyersetfoeorrdinbgytoretfheerribnlgoctok the bdlioffcekrence between the 0.6V bandgap reference diagram of Figure 3. At the start of each oscillator voltage and the feedback voltage. In this way the cycle the MOSFET is turned on through the control peak current level keeps the output in regulation. If circuitry. To prevent sub-harmonic oscillations at the feedback voltage starts to drop, the output of the duty cycles greater than 50 percent, a stabilizing error amplifier increases. These results in more ramp is added to the output of the current sense current to flow through the power MOSFET, thus amplifier and the result is fed into the negative input increasing the power delivered to the output. The of the PWM comparator. When this voltage equals SB6284 ShBas62in8t4ernhaalssoinftesrtnaarlt stoofltimstiat rtthetoalimmoitutnhteoaf mount of input current at startup and to also limit the amount of overshoot on the output. Figure 3. Functional Block Diagram SD.15 www.shouding.net 4 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding SB6284 TYPICAL OPERATING CHARACTERISTICS Efficiency Curve Efficiency Curve Current limit(A) Efficiency Iout (mA) line Regulation Iout(mA) Load regualation Vout(V) Vout(V) Vin (V) Freq VS Vin Iout (mA) Efficiency VS Vin SD.15 www.shouding.net 5 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding SB6284 APPLICATION INFORMATION Setting the Output Voltage The internal reference VREF is 0.6V (Typical).The For best performance of the SB6284, the following output voltage is divided by a resistor divider,R1 and guidelines must be strictly followed. R2 to the FB pin. The output voltage is given by  Input and Output capacitors should be placed VOUT = VREF × (1 + R1 ) R2 close to the IC and connected to ground plane to reduce noise coupling.  The GND should be connected to a strong Inductor Selection ground plane for heat sinking and noise protection. The recommended values of inductor are 4.7 to  Keep the main current traces as possible as 22μH. Small size and better efficiency are the major short and wide. concerns for portable device, such as SB6284 uSsBe6d284 used SW node of DC-DC converter is with high for mobile phone. The inductor should have low core frequency voltage swing. It should be kept at a loss at 1.2MHz and low DCR for better efficiency. To small area. avoid inductor saturation current rating should be  Place the feedback components as close as considered. possible to the IC and keep away from the noisy devices. Capacitor Selection Input and output ceramic capacitors of 22μF are SB6284 applications. For better voltage filtering, ceramic capacitors with low ESR are recommended. X5R and X7R types are suitable because of their wider voltage and temperature ranges. Diode Selection dDiiooddee iiss aa ggoooodd cchhooiiccee ffoorr SSBB66228844 because of its low forward voltage drop and fast reverses recovery. Using Schottky diode can get better efficiency. The high speed rectification is also a good characteristic of Schottky diode for high switching frequency. Current rating of the diode must meet the root mean square of the peak current and output average current multiplication as following : I D (RMS) ≈ I OUT × I PEAK The diode’ s reverse breakdown voltage should be larger than the output voltage. SD.15 www.shouding.net 6 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188 Shouding PACKAGE DESCRIPTION SB6284 B628** ** Yearweek TOP VIEW RECOMMENDED LAND PATTERN FRONT VIEW SIDE VIEW DETAIL “A” Figure 4. TSOT23-6/SOT23-6 Physical Dimensions NOTE: 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) 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) SD.15 www.shouding.net 7 奥科迪科技(授权代理)蔡女士QQ:2355504930 电话:82956188

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