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发布者:来自网络 发布时间:2013-12-24 阅读:2532次    关键字: LED
EML3273-5.0A,Synchronous Step-Down DC-DC Converter


EML3273-5.0A,Synchronous Step-Down DC-DC Converter DataSheet

General Description
    EML3273 is a high efficiency, DC-DC synchronous
buck converter witch provides 5.0A output loading
after output voltage reach preset voltage. EML3273
uses different modulation algorithms for various
loading conditions. Under heavy load, EML3273
regulates the output voltage using Pulse Width
Modulation (PWM). The PWM mode provides low
output voltage ripple and fixed frequency noise.
While in light load, it enters Power Skip Modulation
(PSM) automatically to ensure a highly efficient
operation at light load condition. Under very heavy
load condition, or when the input voltage
approaches the output voltage, EML3273 enters low
dropout voltage operation under 100% duty cycle.
    The internal generated 0.8V precision feedback
reference voltage is designed for low output voltage
request. Low Power-FET Ron synchronous switch
dramatically reduces conduction loss.
    The EML3273 is available in an 8-pin, space-saving
E-SOP-8L package.

Features
􀂄 Wide Operating Voltage Ranges : 3.0V to 5.5V
􀂄 5.0A Output Current
􀂄 High efficiency Buck Power Converter
􀂄 Auto-select PSM/PWM (Mode=VCC)
􀂄 Force PWM (Mode=GND)
􀂄 Power Good Indicator
􀂄 LDO mode: duty cycle: 100%
􀂄 Synchronous Power Switches Rectification, no Schottky Diode Required
􀂄 1 MHz Switching Frequency
􀂄 Internal Soft-Start
􀂄 Current Limit Protection
􀂄 Over Temperature Protection
􀂄 Output Shorting Protect
􀂄 Output Over Voltage Protection

Applications
􀂄 Cellular telephone
􀂄 Wireless and DSL Modems
􀂄 Digital Still Cameras
􀂄 Portable Products
􀂄 MP3 Players

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