LX2750

LX2750

  • 厂商:

    MICROSEMI(美高森美)

  • 封装:

  • 描述:

    LX2750 - SINGLE INPUT SUPPLY PWM CONTROLLER WITH LDO CONTROLLER - Microsemi Corporation

  • 详情介绍
  • 数据手册
  • 价格&库存
LX2750 数据手册
LX2750 SINGLE INPUT SUPPLY PWM CONTROLLER WITH LDO CONTROLLER PRODUCTION DATA SHEET Pb Free Product DESCRIPTION The LX2750 controller IC is a compact synchronous Buck controller IC with 16 lead MLPQ package designed for step-down DC to DC converter applications. Selectable feedforward voltage mode control or constant on time control provides fast dynamic response. Selectable diode emulation mode greatly improves the light load efficiency. The LX2750 controller is optimized to convert single supply 12V bus voltage to as low as 0.8V output voltage. An internal regulator converts bus voltage to 5V, which provides voltage supply to internal logic and driver circuit. The LX2750 employs programmable loss-less current limiting by sensing the Rdson of synchronous MOSFET followed by hiccup feature. Feedback under voltage also triggers hiccup. Internal UVLO keeps the controller off until the bus supply voltage exceeds 9V where internal digital soft starts get initiated to ramp up output. The LX2750 employs NMOS LDO controller. Other features include: 5V gate drive for HDRV signal, 12V gate drive for LDRV signal, programmable frequency, adaptive deadband control. n n FEATURES Single Input 12V Bus Voltage Excellent Dynamic Response with Selectable Feedforward Voltage Mode Control or Constant On Time Control Diode Emulation Mode Available Programmable Switching Frequency Up to 2MHz Internal Digital Soft Start Function Programmable Over Current Protection Triggers Hiccup NMOS LDO Controller Available FB UVLO Followed by Hiccup Feature in Both Controllers 5V High Side Driver and 12 V Low Side Driver Pb-free and RoHS Compliant n n n n n n n n n n n n APPLICATIONS Graphic Card on Board Converters On Board DC to DC such as 12V to 3.3V, 2.5V or 1.8V Set Top Box and LCD Display ASIC Power Supplies TYPICAL APPLICATION VIN1 +12V 15 7 VIN 10 BST VCC HDRV 14 SW 13 12 Connected to 5VREG Voltage mode Connected to GND Constant on time mode Connected to 5VREG synchronous mode Connected to GND Diode emulation mode VOUT1 +1.8V@8A PGOOD 9 FCCM 16 RT LX2750 8 MODE LDRV 11 2 FB COMP 6 VREF_OC LDO_DRV 1 3 5 REFIN GPIO 17 GND(PAD) LDO_FB 4 VOUT2 +1.1V Figure1 - Typical application of LX2750 ORDERING INFORMATION Device LX2750CLQ Temperature 0 to 70o C Package 3X3 MLPQ-16L Frequency 200kHz to 2MHz Pb-Free Yes Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX2750CLQ-TR) Rev. 1.0a 07/14/10 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 1 LX2750 ABSOLUTE MAXIMUM RATINGS 5VREG to GND & BST to SW voltage ................ -0.3V to 6V VIN, LDO_DRV to GND ...................................... -0.3V to 16V BST,HDRV to GND Voltage .............................. -0.3V to 21V SW to GND ....................................................... -2V to 16V LDRV to GND .................................................... -0.3V to VIN+0.3V All other pins ..................................................... -0.3V to VCC+0.3V Storage Temperature Range ............................... -65oC to 150oC Operating Junction Temperature Range ...............-40oC to 125oC ESD Susceptibility .............................................. 1000V CAUTION: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. PACKAGE INFORMATION 3x3 16-LEAD PLASTIC MLPQ θ JA ≈ 46o C/W SW 13 12 PGOOD 17 GND 11 LDRV 10 VCC 9 FCCM 5 REFIN 6 VREF_OC 7 VIN 8 MODE SYM VREF VIN from 10V to 16V Vin No switching,COMP=0.8V Switching with HDRV and LDRV open,COMP=1.8V 16 COMP 1 FB 2 15 14 LDO_DRV 3 LDO_FB 4 ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over VIN=12V and TA = 0 to 70oC. Typical values refer to TA = 25oC. PARAMETER REFOUT_OC Voltage REFOUT_OC Voltage Accuracy Supply Voltage(Vin) Vin V oltage Range Input Voltage Current(Static) Input Voltage Current (Dynamic) Rev. 1.0a 07/14/10 HDRV BST RT Test Condition Min 2 .45 -0.3 10 TYP 2.5 MAX 2.55 0.3 16 Units V % V mA mA 7 9 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 2 LX2750 PARAMET ER VIN UVL O V in-Threshold V in-Hysteresis 5V REG 5VREG Output 5VREG Max Current SS Soft Start time Oscillator (Rt) Frequency Ramp-feedforward gain Ramp Offset Max Duty Cycle Min Off Tim e Min Controlable On Time Rt Disable threshold Error Amplifiers Open Loop Gain (Note1) Gain Bandwidth (Note1) Input Bias Current Max Sourcing Current Max Sinking Current COMP High Voltage COMP Low Voltage SW zero cross comparator Offset voltage High Side Driver N Output Impedance , Sourcing Current (Note1) Output Impedance , Sinking Current (Note1) Low Side Driver Output Impedance, Sourcing Current (Note1) SYM V in_UVLO V in_Hyst Test Condition Vin Rising Vin Falling No switching Min TYP 9 8 5.4 50 5.2 1.3 MAX Units V V V mA mS mS 30 Tss_pwm Tss_con FS V RAMP F S=300kHz F S=350kHz,MODE=5V F S=350kHz,MODE=0V Rt=110k,MODE=5V 245 300 0.1 1 80 560 200 0.3 80 10 1 3 0.4 4.4 0.1 -2 359 kHz V/V V % nS nS V dB MHz nA mA mA V V mV ohm ohm Ib FB=0.7V, comp>=3V FB=0.9V,com p8V LDOFB=0.9V, LDODRV
LX2750
物料型号: - LX2750CLQ:工作温度范围0至70°C,3X3 MLPQ-16L封装,频率200kHz至2MHz,无铅产品。

器件简介: - LX2750是一款紧凑型同步Buck控制器IC,采用16引脚MLPQ封装,专为降压DC-DC转换器应用设计。可选的前馈电压模式控制或恒定开启时间控制提供快速动态响应。可选的二极管仿真模式大大提高轻载效率。LX2750优化用于将单电源12V总线电压转换至低至0.8V的输出电压。内部调节器将总线电压转换为5V,为内部逻辑和驱动电路提供电压供应。LX2750采用可编程无损电流限制,通过感应同步MOSFET的Rdson,然后是hiccup特性。欠压反馈也触发hiccup。内部UVLO在总线供电电压超过9V时保持控制器关闭,内部数字软启动开始升压输出。LX2750采用NMOS LDO控制器。其他特性包括:5V高侧驱动和12V低侧驱动,可编程频率,自适应死区控制。

引脚分配: - VCC:内部5V调节器输出,供应内部5V偏置电路。 - BST:为高侧FET驱动供电。 - GND:地引脚。 - FB:误差放大器的反相输入,通过电阻分压器连接到开关调节器的输出,设置输出直流电压。 - COMP:误差放大器的输出,与FB引脚一起用于补偿电压控制反馈回路。 - SW:连接到高侧FET的源极,为高侧驱动提供返回路径。 - HDRV:高侧栅极驱动输出。 - LDRV:低侧栅极驱动输出。 - VIN:内部5V调节器、LDO控制器和低侧驱动的电压供应。 - RT:振荡器的频率可以通过使用外部电阻从这个引脚到地来设置。将这个引脚拉低至0.3V以下可以关闭两个控制器。 - LDO_FB:LDO控制器反馈输入。这个引脚通过电阻分压器连接到LDO的输出,设置输出直流电压。 - LDO_DRV:LDO控制器输出。这个引脚控制外部NCH MOSFET的栅极。这个引脚的最大额定值是16V。 - MODE:连接到5VREG电压控制模式将被选择。连接到地,恒定开启时间控制模式将被选择。 - FCCM:连接到5VREG,同步模式将被选择。连接到地,二极管仿真模式将被选择,当电感电流变为负电流时,LDRV将关闭。 - REFIN:误差放大器的参考输入电压。 - VREF_OC:2.5V外部参考。通过从这个引脚到地连接电阻来设置OCP触发电平。 - PGOOD:开关调节器的PGOOD指示。需要上拉电阻到Vcc或更低电压。当FB引脚达到参考电压的85%时,PGOOD从低状态转换为高状态。

参数特性: - 供电电压范围:10V至16V。 - 输入电压电流(静态):无开关,COMP=0.8V时为7mA。 - 输入电压电流(动态):开关时HDRV和LDRV打开,COMP=1.8V时为9mA。 - 内部数字软启动功能。 - 可编程过电流保护触发hiccup。 - NMOS LDO控制器可用。 - 5V高侧驱动和12V低侧驱动。 - 可编程频率,最高2MHz。 - 内部数字软启动功能。

功能详解: - LX2750控制器IC具备多种功能,包括可编程无损电流限制、内部数字软启动、欠压锁定、可编程过电流保护等。

应用信息: - 适用于图形卡板上转换器、板上DC-DC如12V至3.3V、2.5V或1.8V、机顶盒和LCD显示ASIC电源等。
LX2750 价格&库存

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