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Elite Semiconductor - Synchronous Step-Down DC-DC Converter

Numéro de référence EML3171
Description Synchronous Step-Down DC-DC Converter
Fabricant Elite Semiconductor 
Logo Elite Semiconductor 





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EML3171 fiche technique
ESMT
EML3171
2.0A, Synchronous Step-Down DC-DC Converter
General Description
EML3171 is a high efficiency, DC-DC synchronous
buck converter which provides 2.0A output loading
after output voltage reach preset voltage. EML3171
uses different modulation algorithms for various
loading conditions. Under heavy load, EML3171
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, EML3171 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 EML3171 is available in an 8-pin, space-saving
TDFN-3x3 package.
Typical Application
Features
„ Wide Operating Voltage Ranges : 2.6V to 5.5V
„ 2.0A Output Current
„ High efficiency Buck Power Converter
„ Auto-select PSM/PWM
„ LDO mode: duty cycle: 100%
„ Synchronous Power Switches Rectification, no
Schottky Diode Required
„ 1.4MHz 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
R
V = V × (1 + 1 )
OUT
FB
R
2
Fig. 1 EML3171 application circuit
Elite Semiconductor Memory Technology Inc.
Publication Date: Dec. 2013
Revision: 0.1
1/16

PagesPages 16
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