LX13088ACLD-TR

LX13088ACLD-TR

  • 厂商:

    MICROSEMI(美高森美)

  • 封装:

  • 描述:

    LX13088ACLD-TR - Dual 1A Step-Down Converters - Microsemi Corporation

  • 详情介绍
  • 数据手册
  • 价格&库存
LX13088ACLD-TR 数据手册
LX13088A TM ® Dual 1A Step-Down Converters P RODUCTION D ATASHEET KEY FEATURES • Outputs Can Be Set From 1V to 3.6V @ 1A, VIN Dependent • 3.0V to 5.5V Operating Input Voltage Range • No Rectifier Diode required • 1.3MHz Switching • 180° Phase Shifted Switching • Optional External Clocking (2x clock required) • Light load Pulse Skipping • Enable/Sleep state • Internal Soft Start • Open-drain Power On Reset Monitors Input and Outputs • Discharge Before-Turn-On • Peak Over-Current Protection • Short Circuit Protection • Over Temperature Shutdown APPLICATIONS • Hard Disk Drives • Set- Top Boxes DESCRIPTION The LX13088A is a highly integrated dual output voltage regulator ideal for low power applications that require minimal board space. The two current mode buck converters include integrated high side control switches, synchronous rectifiers, and internal compensation. The outputs of each converter are both rated for up to 1A, and the output voltages are adjustable using external resistive dividers. The LX13088A step down converters operate at 1.3MHz fixed switching frequency under normal load, reducing external output filter component values and size. Under light load conditions, the converters operate in a pulse-skipping mode for improved efficiency. The LX13088A incorporates out of phase switching, where converter 2 switches 180° out of phase from converter 1 in order to minimize the input ripple effects. The controller also features an E/S pin that provides an enable input function, or allows the converter to be synchronized to an external clock. With the E/S input held low, the LX13088A draws less than 10uA. Both converters have controlled soft start, in addition to power up sequencing. In the start-up sequence, the output of converter 1 is designed to precede the output of converter 2. Power On Reset function is provided by means of an open-drain output at the POR pin. The Power On Reset function monitors the voltages at the VMON, FB1 and FB2 pins, and pulls low if any of these voltages drop below the stated POR threshold. The POR is internally deglitched and provides a delayed recovery and reset time. The LX13088A provides peak over current protection, short circuit protection and thermal shutdown. Discharge-BeforeTurn-On discharges the outputs completely before soft starting to always bring them up in the proper sequence at start up or after a POR event. W WW . Microsemi . C OM IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Product Highlight LX13088A LX13088A PACKAGE ORDER INFO THERMAL DATA TA (°C) 0 to +70 Copyright © 2010 Rev. 1.0, 2010-09-23 LD Plastic 3x3 mm DFN 10-pin RoHS Compliant / Pb-free θJA = 33 °C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT LX13088ACLD Microsemi Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX13088ACLD-TR) Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. Page 1 Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 LX13088A TM ® Dual 1A Step-Down Converters P RODUCTION D ATASHEET ABSOLUTE MAXIMUM RATINGS PVIN, AVIN to AGND, PGND...................................................................... -0.3 to +7.0 V SW1 and SW2 to AGND, PGND .................................................. PGND -2V to xVIN+2V All other pins to AGND.................................................................... -0.3V to xVIN + 0.3V Operating Junction Temperature Range .......................................................... 00C to 1500C Storage Temperature Range..........................................................................–650C to 1500C 0 Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) .. 260°C (+0 -5) C Notes: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. PGND must be wired to AGND externally. PACKAGE PIN OUT W WW . Microsemi . C OM LD PACKAGE (Top View) Marking 088A Date/Lot Code MSC RoHS / Pb-free 100% Matte Tin Finish FUNCTIONAL PIN DESCRIPTION Name FB2 Pin # 1 Description Feedback from VO2. Connect voltage divider to the load side of VO2 output inductor-capacitor filter. Analog Input. Input to power the internal circuitry of the device, connect to PVIN through a 10Ω resistor and bypass through a 1μF ceramic capacitor between this pin and PGND, as close to the LX13088A as possible. Control MOSFET switch power inputs. Connect a 10µF ceramic capacitor between this pin and PGND, as close to the LX13088A as possible. Converter 2 synchronous buck switching output. Connect to VO2 inductor. Power Ground Connection. Synchronous rectifier MOSFET source. Provide a star connection between this pin, VO1, VO2 filter capacitor returns, VIN input capacitor return, and AGND. Keep the star connection as close to the LX13088A IC as possible. Converter 1 synchronous buck switching output. Connect to VO1 inductor. Enable/Synchronization. Pulling this pin high statically enables the LX13088A and pulling the pin low statically will shut down the LX13088A. Applying a pulse to this pin will synchronize SW1 and SW2 switching frequency to ½ the external clock frequency. Power On Reset output pin. Monitors FB1, FB2 output voltage levels and VIN. POR is pulled low if an output voltage droop is detected on FB1 or FB2 or VIN, and is Hi-Z during normal operation. Voltage Monitor – Supervisor for one external voltage (could be input voltage). The POR output is triggered if this output falls below the VMON threshold. Feedback from VO1. Connect voltage divider to the load side of VO1 output inductor-capacitor filter. Analog Ground. Connect the exposed pad on the bottom of the package to the GND plane for a thermal heat sink. Page 2 AVIN 2 PVIN 3 SW2 4 PGND SW1 E/S POR VMON FB1 AGND 5 6 7 8 9 10 PAD LX13088A LX13088A Copyright © 2010 Rev. 1.0, 2010-09-23 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 LX13088A TM ® Dual 1A Step-Down Converters P RODUCTION D ATASHEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature of 00C < Temp
LX13088ACLD-TR
物料型号:LX13088A

器件简介:LX13088A是一款高度集成的双输出电压调节器,适用于需要极小板空间的低功耗应用场合。

该器件包含两个电流模式降压转换器,集成了高侧控制开关、同步整流器和内部补偿。

每个转换器的输出均能承受高达1A的电流,输出电压可通过外部电阻分压器进行调节。


引脚分配: - FB2 (1):来自VO2的反馈。

在VO2输出电感-电容滤波器的负载侧连接电压分压器。

- AVIN (2):模拟输入。

输入内部电路的电源,通过10Ω电阻连接至PVIN,并在PGND之间通过1μF陶瓷电容器进行旁路。

- PVIN (3):控制MOSFET开关电源输入。

在此引脚与PGND之间连接一个10µF陶瓷电容器。

- SW2 (4):转换器2的同步降压开关输出。

连接至VO2电感。

- PGND (5):电源地连接。

同步整流MOSFET源。

在此引脚、VO1、VO2滤波电容器返回、VIN输入电容器返回和AGND之间提供星形连接。

- SW1 (6):转换器1的同步降压开关输出。

连接至VO1电感。

- E/S (7):使能/同步。

将此引脚拉高以使能LX13088A,拉低以关闭LX13088A。

将此引脚应用脉冲可将SW1和SW2的开关频率同步至外部时钟频率的一半。

- POR (8):开机复位输出引脚。

监控FB1、FB2输出电压和VIN。

如果检测到FB1或FB2的输出电压下降或VIN下降,则POR被拉低。

- VMON (9):电压监控——监视一个外部电压(可以是输入电压)。

如果此输出低于VMON阈值,则触发POR输出。

- FB1 (10):来自VO1的反馈。

在VO1输出电感-电容滤波器的负载侧连接电压分压器。

- AGND PAD:模拟地。

将封装底部的暴露垫连接至GND平面,作为热沉。


参数特性: - 输入电压范围:3.0V至5.5V - 固定开关频率:1.3MHz - 轻负载下脉冲跳跃模式以提高效率 - 使能/睡眠状态 - 内部软启动 - 开机复位监控输入和输出 - 过温关断保护 - 峰值过流保护和短路保护

功能详解: - LX13088A降压转换器在正常负载下以1.3MHz的固定开关频率工作,减少外部输出滤波组件的值和尺寸。

在轻负载条件下,转换器以脉冲跳跃模式工作,以提高效率。

- 通过外部电阻分压器可将输出电压设置在1V至3.6V之间。

- 具有相位差180°的开关功能,以降低输入纹波效应。

- 可选的外部时钟同步功能。


应用信息: - 适用于硬盘驱动器、机顶盒等应用。


封装信息: - LX13088A提供10引脚塑料DFN封装,符合RoHS和无铅标准。
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