LX1732CDU中文资料High Current PFM Boost Converter数据手册Microchip规格书

描述 Description

The LX1732 is a compact, high efficiency, step-up DC-DC boost regulator implemented in a BiCMOS process technology. This device features variable frequency operation and a built in N-channel MOSFET power switch for optimal functioning in low voltage portable systems.

Start-up operation is guaranteed from 1.1 V inputs (at light load) and the input voltage can be as low as 0.7V after start-up. This attribute allows the LX1732 to operate in an extended power-savings mode, supplying(data) critical system components, even after battery capacity no longer supports normal operation.

The output voltage programming range of 2.2V to 5V requires only two extermal resistors via the feedback pin(see Figure 1.0). Output load currents of up to 200mA are achievable and the internal MOSFET is capable of switching up to a 1A current limit. Quiescent current during operation is200uA(max) and in shutdown-mode drops to a mere 1uA thus maximizing overall battery life-time. The LX1732 features a low battery-detect circuitry that alerts system power management of low input voltages thus allowing portable systems to enter a power-savings mode(e.g, to protect data)

特性 Features

• 88% Efficiency
• 200µA Quiescent Current
• 0.1µA Logic Shutdown
• Low-Battery Detector

应用 Application

• Pagers
• Wireless Phones
• PDAs
• Handheld Computers
• General LCD Bias Applications
• LED Driver