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发布者:微桥AX3519 发布时间:2011-2-16 阅读:4770次    关键字: AXELITE 亚瑟莱特 DC-DC 微桥 AX3519
AX3519-1MHz,4A Synchronous Step-Down Converter


AX3519-1MHz,4A Synchronous Step-Down ConverterDataSheet

GENERAL DESCRIPTION
    The AX3519 is a 1MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 4A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The AX3519 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The AX3519 can supply up to 4A output load current from a 2.8V to 5.5V input voltage and the output voltage can be regulated as low as 0.8V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The AX3519 is available in adjustable (0.8V to VIN) output voltage. The device is available in SOP-8L-EP and TDFN-8 Pb-free packages.

FEATURES
- 2.8V to 5.5V Input Voltage Range
- Output Voltages from 0.8V to VIN
- High Efficiency: Up to 94%
- 1MHz Constant Frequency Operation
- With power saving mode
- Up to 4A Output Current
- No Schottky Diode Required
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit and thermal shutdown protection
- Short Circuit Protect (SCP)
- Build-in Soft Start function
- ≤ 5μA Shutdown Current
- SOP-8L-EP and TDFN-8 Pb-Free packages

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