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TI3508BS3406APS1006ME3101

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同步异步升压芯片TI3508PIN DESCRIPTIONPIN 1 2 3 4 5 NAME EN GND LX VIN FB FUNCTION Chip Enable Pin. Drive RUN above 1.5V to turn on the part. RUN below 0.3V to turn it off. Do not leave RUN floating. Ground Pin Power Switch Output. It is the switch node connection to Inductor. Power Supply Input. Must be closely decoupled to GND with a 4.7µF or greater ceramic capacitor. Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage. DriveTheTI3508is a high performance 800mA 1.5MHz monolithic step-down converter. TheTI3508requires only three external power components (Cin, Cout and L). The adjustable version can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage. At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the Rdson drop of the high-side MOSFET. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start function prevents input inrush current and output overshoot during start up.

TI3508BS3406APS1006ME3101

降压芯片BS3406Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: T J is calculated from the ambient temperature T A and power dissipation PD according to the following formula: T J = TA + (PD) x (250° C/W). Note3: 100% production test at +25° C. Specifications over the temperature range are guaranteed by design and characterization. Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequencyFunctional DescriptionThe BS3406 is a high performance 600mA 1.5MHz monolithic step-down converter. The BS3406 requires only three external power components (Cin, Cout and L). The adjustable version can be programmed with external feedback to any voltage, ranging from 0.6V to the input voltage.The BS3406 is offered in a low profile (1mm) 5-pin, thin SOT package, and is available in an adjustable version and fixed output voltage of 1.2V,1.5V, 1.8V,2.5V and 3.3V.At dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the Rdson drop of the high-side MOSFET. The internal error amplifier and compensation provides excellent transient response, load, and line regulation. Soft start function prevents input inrush current and output overshoot during start up.3. Keep the switching node, SW, away from the sensitive VOUT node. 4. Keep the (-) plates of Cin and Cout as close as possibleOscillator Frequency vs TemperatureOutput Voltage VS Output Current1. 84 1. 83 1. 821.8001.700FREQUENCY (MHz)6001.600Output Voltage(V)1. 81 1. 80 1. 79 1. 78 1. 771.500VIN =3.6V Vout=1.8V1.4001.3001. 76 0 100 200 300 400 500Output Curren t(mA)1.200 -48-32 -1601632486480 96TEMPERATURE (C)

TI3508BS3406APS1006ME3101

降压芯片APS1006This formula has a maximum at V IN = 2VOUT , where IRMS = IOUT /2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that the capacitor manufacturer’s ripple current ratings are often based on 2000 hours of life. This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required. Always consult the manufacturer if there is any question. The selection of COUT is driven by the required effective series resistance (ESR). Typically, once the ESR requirement for C OUT has been met, the RMS current rating generally far exceeds the IRIPPLE(P-P) requirement. The output ripple ΔVOUT is determined by: When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the APS1006. Check t he following in your layout:Efficiency vs. Output Current (Vout=1.8V) 100 90 80 Output Voltage (V) Efficiency (%) 70 60 VIN=2.7V 50 40 30 20 10 0 0 100 200 300 400 500 600 700 Output Current (mA) VIN=3.6V VIN=4.2V 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0Output Voltage vs. Load Current (Vin=3.6V, Vout=1.8V)100 200 300 400 500 600 700 800 Load Current (mA)

TI3508BS3406APS1006ME3101

500mA 同步降压 DC/DC 转化器 ME3101 系列降压芯片描述: ME3101是一款同步整流降压型 DC/DC。

内置特点:z z z z z z z z z z 同步整流降压 DC/DC 高效率:93%(TYP) 低纹波电压:10mV 输出电流:500mA 振荡频率:1.2MHz PWM/PFM 自动切换控制 最大占空比:100% 兼容陶瓷电容 超小封装:SOT-23-5L 内置软启动电路0.6ΩPMOS 驱动管和 0.7ΩNMOS 开关管。

兼容陶 瓷电容,外部只需一只电感和两只电容,可高效率 的输出 500mA 电流。

内置振荡器电路,振荡频率 可达 1.2MHZ。

ME3101 为 PFM/PWM 型自动开关 控制模式,在满载时也能快速响应,达到纹波小, 效率高的效果。

芯片的待机电流可降至 1.0uA 甚至 更小。

使用注意事项:1. 2. 3. 4. 推荐使用陶瓷电容以获得更小的纹波。

PWM工作状态下,当输入输出压差比较大时,会产生窄脉冲,可能导致部分脉冲跳过。

输入输出压差比较小、负载比较大时,将会输出很宽的脉冲,也可能引发部分脉冲跳过。

芯片内部已经设定了的峰值电流的最大值。

当输入输出电压压差比较大、负载电流也比较高时, 电感峰值电流可能会超过限定的最大电流,这时限流电路开始工作,可能会导致输出电压的不 稳定。

这时可适当调节电感值来保 证电感峰值电流不超过限定值。

按以下公式计算: Ipk = (VIN-VOUT) * On Duty / (2 * L * FOSC) + IOUT L:电感值 FOSC:振荡频率 当输入电压低于2.4V时,因为驱动管导通电阻的影响,最大限流值可能会有所降低。

为了防止芯片受噪声或者高频毛刺的影响,PCB布版时,电容离芯片要尽可能的近。

芯片使用电压低于推荐的电压范围时,芯片工作可能会不稳定。

芯片工作在高温的环境下时,驱动管的漏电流会变大,空载输出电压可能会上升至输入电压。

5. 6. 7. 8.

TI3508BS3406APS1006ME3101

TI3508BS3406APS1006ME3101

 
 

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