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Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown

微功率DC/ DC转换器与低电池电压检测器在关闭时活动

特点
。从两个单元在200mA5V
。 10mA的静态电流关断
。 VIN低至1.5V
。活跃在关机低电池电压检测
。低开关VCESAT：370mV在1A典型
。在主动模式下的静态电流120毫安
。开关频率高达300kHz
。一个电阻可编程峰值电流
。 8引脚SO封装
应用
。 2 - ，3 - ，或4 - Cell到5V或3.3V，升压型
。便携式仪器
。条码扫描器
。掌上电脑
。诊断医疗仪器
。个人资料传播者/计算机
说明
LT®1304是一个微功率升压型DC/ DC转换器的使用在小型，低电压，电池供电系统的理想选择。
该器件工作从一个宽输入电压范围为1.5V至8V。 LT1304-3.3和LT1304-5生成3.3V和5V稳压输出和可调LT1304可提供高达25V的输出电压。静态电流，在主动模式120毫安，下降到仅为10mA，关机仍然活跃在低电池电压检测器。可以降低峰值开关电流，内部设置为1A，通过增加一个电阻从ILIM引脚接地。了高速操作的LT1304允许使用小，表面贴装电感器和电容器。 LT1304可在8引脚SO封装。

FEATURES
. 5V at 200mA from Two Cells
. 10mA Quiescent Current in Shutdown
. Operates with VIN as Low as 1.5V
. Low-Battery Detector Active in Shutdown
. Low Switch VCESAT: 370mV at 1A Typical
. 120mA Quiescent Current in Active Mode
. Switching Frequency Up to 300kHz
. Programmable Peak Current with One Resistor
. 8-Lead SO Package
Application
. 2-, 3-, or 4-Cell to 5V or 3.3V Step-Up
. Portable Instruments
. Bar Code Scanners
. Palmtop Computers
. Diagnostic Medical Instrumentation
. Personal Data Communicators/Computers
DESCRIPTION
The LT®1304 is a micropower step-up DC/DC converter ideal for use in small, low voltage, battery-operated systems.
The devices operate from a wide input supply range of 1.5V to 8V. The LT1304-3.3 and LT1304-5 generate regulated outputs of 3.3V and 5V and the adjustable LT1304 can deliver output voltages up to 25V. Quiescent current, 120mA in active mode, decreases to just 10mA in shutdown with the low-battery detector still active. Peak switch current, internally set at 1A, can be reduced by adding a single resistor from the ILIM pin to ground. The high speed operation of the LT1304 allows the use of small, surface-mountable inductors and capacitors. The LT1304 is available in an 8-lead SO package.