0
登录后你可以
  • 下载海量资料
  • 学习在线课程
  • 观看技术视频
  • 写文章/发帖/加入社区
会员中心
创作中心
发布
  • 发文章

  • 发资料

  • 发帖

  • 提问

  • 发视频

创作活动
FT441AA

FT441AA

  • 厂商:

    FMD(辉芒微)

  • 封装:

    SOT23-5

  • 描述:

    IC REG BUCK ADJ 0.9A SYNC SOT23

  • 详情介绍
  • 数据手册
  • 价格&库存
FT441AA 数据手册
Fremont Micro Devices FT441 1.5MHz, 900mA Synchronous Step-Down Converter FEATURES DESCRIPTION ¾ High Efficiency - Up to 95% The FT441 is a 1.5MHz constant frequency, slope ¾ Guaranteed 900mA Output Current compensated current mode step down converter. It is ¾ 2.5V to 5.5V Input Voltage Range ideal for portable equipment requiring very high ¾ 1.5MHz Constant Frequency Operation current up to 0.9A from single-cell Lithium-ion ¾ No external Schottky Diode Needed batteries while still achieving over 90% efficiency ¾ Adjustable Output Voltages From 0.6V to VIN during peak load conditions. ¾ Fixed Output Voltage Options Available ¾ 100% Duty Cycle Low-Dropout Operation The FT441 integrates a main switch and a ¾ 0.1ȝA Shutdown Current synchronous rectifier for high efficiency without an ¾ SOT23-5 Package external Schottky diode. The FT441 automatically turns off the synchronous rectifier to increase TYPICAL APPLICATIONS efficiency while enters discontinuous PWM mode. ¾ Cellular phones The FT441 can run at 100% duty cycle for low ¾ DSP Core Supplies dropout operation, maximizing battery life in portable ¾ XDSL Applications application. FT441 consumes less than 1uA when ¾ USB Powered Modems enter shutdown mode. ¾ Digital Still Cameras ¾ Portable Instruments The FT441 is available in a fixed output voltages of ¾ PC Cards and Notebooks 1.2V, 1.5V, and 1.8V, and is also available in an adjustable output voltage version capable of generating output voltages from 0.6V to VIN .The FT441 is available in a 5-pin SOT23-5 package. www.fremontmicro.com Page 1 of 10 DS441-A2 Fremont Micro Devices FT441 TYPICAL APPLICATION CIRCUIT VIN 2.7~4.2V 4 SW VIN 3 1 EN Vout 1.8V C2 22pF FT441 C1 10uF L1 2.2uH VFB 5 GND 2 R2 200K C3 10u F R1 100K Figure 1: Typical Application Circuit ABSOLUTE MAXIMUM RATINGS VIN to GND……………………………….……………………………………………………………-0.3V to 6V EN to GND..…………………………………………….……………………………….. ……-0.3V to (VIN+0.3) VFB to GND..…………………………………………………………………………………. -0.3V to (VIN+0.3) SW to GND………………….…………………………………………………………….……-0.3V to (VIN+0.3) Peak SW Sink and Source Current……………...……………………………………………….Internally Limited Junction to Ambient Thermal Resistance (©JA).…………………….……………………………………250ć/W Operating Temperature Range……………….……………………………………………………...-40ć to +85ć Junction Temperature………………………………………………………………………..….... -40ć to +150ć Storage Temperature Range …………………………..……………………………………….….-55ć to +150ć Lead Temperature (Soldering, 10sec) …………………………………………………………………...…...300ć Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. www.fremontmicro.com Page 2 of 10 DS441-A2 Fremont Micro Devices FT441 PIN COMFIGURATION Figure 2: Package Top View TERMINAL DEFINITION Pin Name Description Enable control input 1 EN 2 GND 3 SW Switching node, connecting to inductor 4 VIN Power input 5 VFB/Vout Ground Feedback node. VFB for adjustable version, and Vout for fixed output version Table 1 www.fremontmicro.com Page 3 of 10 DS441-A2 Fremont Micro Devices FT441 ORDERING INFORMATION FT441ķĸ Designator Symbol ķ Output Voltage A ADJ B 1.5V C 1.8V D 2.5V E 1.2V F 2.8V G 3.3V Designator Symbol ĸ Package Type a SOT23-5 Table 2 MARKING RULE 4 5 . ķĸĹĺĻ 1 2 3 Figure 3 ķ Represent Product Series Symbol  Product Series )7[[ Table 3 ĸ Represent Output Voltage Ĺ Represent Package Tape ĺĻ For internal reference www.fremontmicro.com Page 4 of 10 DS441-A2 Fremont Micro Devices FT441 BLOCK DIAGRAM Figure 4: FT441 Block Diagram www.fremontmicro.com Page 5 of 10 DS441-A2 Fremont Micro Devices FT441 ELECTRICAL CHARACTERISTICS (VIN = VEN = 3.6V, TA = 25ÛC unless otherwise specified.) Parameter Symbol Input Voltage Range VIN Under Voltage Lockout Threshold VUVLO Test Conditions Min Typ Max Unit 5.5 V 2.35 2.5 V 2.5 VIN rising 2.2 Operating Supply Current VFB=0.5 or Vout=90% 300 450 uA Shutdown Supply Current VEN = 0V, VIN = 4.2V 0.1 1 uA Adjustable Version Regulation Voltage Fixed Output Regulation Voltage VFB VOUT TA = 25°C 0.588 0.6 0.612 0 < TA < 85°C 0.585 0.6 0.615 -40°C < TA < 85°C 0.582 0.6 0.618 FT441Ba 1.455 1.5 1.545 FT441Ca 1.746 1.8 1.854 FT441Da 2.425 2.5 2.575 FT441Ea 1.164 1.2 1.236 FT441Fa 2.716 2.8 2.884 FT441Ga 3.2 3.3 3.4 0.5 Output Voltage Line Regulation VIN = 2.5V to 5.5V 0.1 Output Voltage Load Regulation IOUT = 0mA to 900mA 0.5 Inductor Current Limit ILIM Oscillator Frequency fSW VIN = 3.6V, VFB =0.5V or Vout=90% VFB=0.6 or Vout=100% V %/V % 1.15 1.5 1.8 A 1.2 1.5 1.8 MHz VFB=0 or Vout=0 400 KHz PMOS On Resistance RONP ISW = -100mA 0.28 0.4 ȍ NMOS On Resistance RONN ISW = 100mA 0.22 0.35 ȍ 1 uA 1 1.5 V 0.01 1 uA EN = 0, VIN = 5.5V, SW Leakage Current VSW = 5.5V or 0V EN Threshold VIH VIN = 2.5V to 5.5V EN Leakage Current IEN VIN = 5.5V, EN = VIN 0.3 Table 4 www.fremontmicro.com Page 6 of 10 DS441-A2 Fremont Micro Devices FT441 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current @Vout=2.5V 100 100 90 90 80 80 Efficiency(%) Efficiency(%) Efficiency vs Output Current @Vout=1.8V 70 60 70 60 50 50 Vcc=2.7 Vcc=3.6 Vcc=4.2 40 Vcc=2.7 Vcc=3.6 Vcc=4.2 Vcc=5 40 30 30 0.1 1 10 100 1 1000 10 100 1000 Output Current(mA) Output Current(mA) Efficiency vs Output Current @Vout=3.3V Efficiency vs Output Current @Vout=1.8V 100 100 90 90 Efficiency(%) Efficiency(%) 80 70 60 80 50 Iout=10mA Iout=200mA Iout=500mA Iout=1A 70 Vcc=3.7 Vcc=4.2 Vcc=5.0 40 60 30 1 10 100 1000 Output Current(mA) www.fremontmicro.com 2 3 4 5 6 Output Current(mA) Page 7 of 10 DS441-A2 Fremont Micro Devices FT441 Load Regulation @Vout=1.8V 1.79 Vout(V) 1.785 1.78 1.775 Vcc=2.7 Vcc=3.6 Vcc=4.2 Vcc=5 1.77 1 10 100 1000 Iout(mA) www.fremontmicro.com Page 8 of 10 DS441-A2 Fremont Micro Devices FT441 APPLICATION INFORMATION Figure4 below shows the typical application circuit with FT441 fixed output versions. VIN 2.7~4.2V 4 SW VIN L1 2.2uH 3 Vout 1.8V FT441 C1 10uF 1 EN Vout C2 5 10uF GND 2 Figure 4 Typical Application Circuit with fixed output versions Inductor Selection Under normal operation, the inductor maintains continuous current to the output. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current, and small value inductors result in higher ripple currents. The inductor value can be derived from the following equation: L Vout u (V IN  Vout ) , Where ̲IL is inductor ripple current. V IN u 'I L u f osc Input Capacitor Selection The input capacitor reduces input voltage ripple to the converter; a 10uF ceramic capacitor is recommended for most applications. Output Capacitor Selection The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. The output ripple ̲Vout approximately: 'VOUT # 'I L u ( ESR  1 ) 8 fC OUT Output Voltage Programming Figure1 above shows the typical application with FT4412 adjustable version. The external resistor sets the output voltage according to following equation: VOUT www.fremontmicro.com 0.6V u (1  Page 9 of 10 R2 ) R1 DS441-A2 Fremont Micro Devices FT441 SOT23-5 PACKAGE Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.95 (BSC) 0.037 (BSC) e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 ș 0° 8° 0° 6° www.fremontmicro.com Page 10 of 10 DS441-A2
FT441AA
1. 物料型号: - 名称:FT441 - 类型:1.5MHz同步降压转换器

2. 器件简介: - FT441是一款1.5MHz恒定频率、斜率补偿的电流模式降压转换器,适用于需要从单节锂离子电池获得高达0.9A大电流的便携设备,同时在峰值负载条件下仍能实现超过90%的效率。 - 集成主开关和同步整流器,无需外部肖特基二极管,提高效率。 - 可100%占空比运行,实现低掉电操作,最大化电池寿命。 - 关闭模式下消耗小于1uA电流。

3. 引脚分配: - EN:使能控制输入 - GND:地 - SW:开关节点,连接到电感器 - VIN:电源输入 - VFB/Vout:反馈节点,可调版本为VFB,固定输出版本为Vout

4. 参数特性: - 输入电压范围:2.5V至5.5V - 欠压锁定阈值:2.2V至2.5V - 工作电源电流:300uA至450uA - 关闭电源电流:0.1uA至1uA - 可调版本调节电压:0.588V至0.618V - 固定输出调节电压:1.164V至3.4V(不同型号)

5. 功能详解: - 效率与输出电流的关系:在不同输入电压下展示效率与输出电流的关系。 - 参考电压与温度关系:展示参考电压随温度变化的情况。 - 启动从关闭:展示从关闭模式启动时的输出电压变化。

6. 应用信息: - 典型应用电路图:展示了FT441固定输出版本的典型应用电路。 - 电感器选择:根据所需的纹波电流选择电感器值。 - 输入电容选择:推荐大多数应用使用10uF陶瓷电容。 - 输出电容选择:需要低阻抗的输出电容以保持输出电压纹波小并确保调节环路稳定。 - 输出电压编程:通过外部电阻设置输出电压。

7. 封装信息: - FT441采用SOT23-5封装,文档中提供了封装的详细尺寸。
FT441AA 价格&库存

很抱歉,暂时无法提供与“FT441AA”相匹配的价格&库存,您可以联系我们找货

免费人工找货