FAN5307S18X

FAN5307S18X

  • 厂商:

    FAIRCHILD(仙童半导体)

  • 封装:

  • 描述:

    FAN5307S18X - High-Efficiency Step-Down DC-DC Converter - Fairchild Semiconductor

  • 详情介绍
  • 数据手册
  • 价格&库存
FAN5307S18X 数据手册
FAN5307 High-Efficiency Step-Down DC-DC Converter January 2006 FAN5307 High-Efficiency Step-Down DC-DC Converter Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ General Description The FAN5307, a high efficiency low noise synchronous PWM current mode and Pulse Skip (Power Save) mode DC-DC converter is designed for battery-powered applications. It provides up to 300mA of output current over a wide input range from 2.5V to 5.5V. The output voltage can be either internally fixed or externally adjustable over a wide range of 0.7V to 5.5V VIN by an external voltage divider. Custom output voltages are also available. Contact a Fairchild sales representative for customized output voltage options. At moderate and light loads pulse skipping modulation is used. Dynamic voltage positioning is applied, and the output voltage is shifted 0.8% above nominal value for increased headroom during load transients. At higher loads the system automatically switches to current mode PWM control, operating at 1 MHz. A current mode control loop with fast transient response ensures excellent line and load regulation. In Power Save mode, the quiescent current is reduced to 15µA in order to achieve high efficiency and to ensure long battery life. In shut-down mode, the supply current drops below 1µA. The device is available in 5-lead SOT-23 and 6-lead MLP 3x3mm packages. 95% Efficiency, Synchronous Operation Adjustable Output Voltage Option from 0.7V to VIN 2.5V to 5.5V Input Voltage Range Customized Fixed Output Voltage Options Up to 300mA Output Current Fixed Frequency 1MHz PWM Operation High Efficiency Power Save Mode 100% Duty Cycle Low Dropout Operation Soft Start Dynamic Output Voltage Positioning 15µA Quiescent Current Excellent Load Transient Response 5-Lead SOT-23 Package 6-Lead MLP 3x3mm Package Applications ■ Pocket PCs, PDAs ■ Cell Phones ■ Battery-Powered Portable Devices ■ Digital Cameras ■ Low Power DSP Supplies Typical Application EFFICIENCY vs. LOAD CURRENT VOUT = 1.8V 100 95 90 Efficiency [%] 85 80 75 70 65 0.01 0.1 1 10 100 1000 VIN=3.6V VIN=5.5V VIN=2.5V Load Current [mA] ©2005 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FAN5307 Rev. 1.0.4 FAN5307 High-Efficiency Step-Down DC-DC Converter Pin Assignment Pin Description 5-Lead SOT-23 Pin No. 1 2 3 4 5 Pin Name VIN GND EN FB LX Pin Description Supply voltage input. Ground. Enable Input. Logic high enables the chip and logic low disables the chip and reduces supply current to
FAN5307S18X
### 物料型号 - 型号:FAN5307 - 固定输出电压版本:FAN5307S18X(1.8V, 5-Lead SOT-23)、FAN5307MP18X(1.8V, 6-Lead 3x3mm MLP) - 可调输出电压版本:FAN5307SX(5-Lead SOT-23)、FAN5307MPX(6-Lead 3x3mm MLP)

### 器件简介 FAN5307是一款高效率、低噪声的同步PWM电流模式和脉冲跳跃(节能)模式DC-DC转换器,适用于电池供电的应用。它在2.5V至5.5V的宽输入电压范围内提供高达300mA的输出电流。输出电压可以是内部固定的,也可以通过外部电压分压器在0.7V至5.5V的范围内调整。

### 引脚分配 - 5-Lead SOT-23: - VIN(1):供电电压输入。 - GND(2):地。 - EN(3):使能输入。逻辑高启用芯片,逻辑低禁用芯片并将供电电流降至小于1μA。 - FB(4):反馈输入。对于固定电压选项,将此引脚直接连接到输出。对于可调电压选项,将此引脚连接到电阻分压器。 - Lx(5):电感引脚。此引脚连接到内部MOSFET开关。

- 6-Lead 3x3mm MLP: - EN(1):使能输入。 - GND(2):参考地。 - VIN(3):供电电压输入。 - Lx(4):电感引脚。 - PGND(5):电源地。内部N沟道MOSFET连接到此引脚。 - FB(6):反馈输入。

### 参数特性 - 效率高达95%,同步操作。 - 固定频率1MHz PWM操作。 - 高效率节能模式,静态电流降至15μA。 - 100%占空比低 dropout 操作。 - 软启动和动态输出电压定位。

### 功能详解 FAN5307在中等和轻负载下使用脉冲跳跃调制,并应用动态电压定位,以增加负载瞬态期间的余量。在重负载下,系统自动切换到1MHz的电流模式PWM控制。电流模式控制环具有快速的瞬态响应,确保了出色的线和负载调节。

### 应用信息 适用于掌上电脑、PDA、手机、电池供电的便携设备、数码相机和低功耗DSP电源。

### 封装信息 - 5-Lead SOT-23封装 - 6-Lead MLP 3x3mm封装
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