Harman Kardon AVR 161S (serv.man2) Service Manual ▷ View online
Harman Kardon
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6HUYLFH0DQXDO
Page 89 of 178
Harman Kardon
$95$956
6HUYLFH0DQXDO
Page 90 of 178
Harman Kardon
$95$956
6HUYLFH0DQXDO
Page 91 of 178
ESMT/EMP
EML3418
Elite Semiconductor Memory Technology Inc./
Elite Micropower Inc.
Publication Date: Jan. 2011
Revision: 2.3 1/17
1.3MHz 2A, Synchronous Step-Down Regulator
General Description
EML3418 is designed with high efficiency step
down DC/DC converter for portable devices
applications. It features with extreme low
quiescent current with no load which is the best
quiescent current with no load which is the best
fit for extending battery life during the standby
mode. The device operates from 2.5V to 5.5V
input voltage and up to 2.0A output current
input voltage and up to 2.0A output current
capability. High 1.3MHz internal frequency
makes small surface mount inductors and
capacitors possible and reduces overall PCB
capacitors possible and reduces overall PCB
board space. Further, build-in synchronous
switch makes external Schottky diode is no
longer needed and efficiency is improved.
longer needed and efficiency is improved.
EML3418 is designed base on pulse width
modulation (PWM) for low output voltage ripple
modulation (PWM) for low output voltage ripple
and fixed frequency noise, low dropout mode
provides 100% duty cycle operation. Low
reference voltage is designed for achieving
reference voltage is designed for achieving
regulated output down to 0.6V.
The device is available in an adjustable version
for TDFN-8 and SOP-8FD package.
for TDFN-8 and SOP-8FD package.
Features
Achieve 95% efficiency
Input Voltage : 2.5V to 5.5V
Output Current up to 2A
Reference voltage 0.6V
Quiescent Current 240ӴA with No
Switching
Switching
Internal switching frequency 1.3MHz
No Schottky Diode needed
Low Dropout Operation: 100% Duty Cycle
Shutdown current < 1 A
Excellent Line and Load Transient
Response
Response
Over-current and Over-temperature
Protection
Applications
Blue-Tooth devices
Cellular and Smart Phones
Personal multi-media Player (PMP)
Wireless networking
Digital Still Cameras
Portable applications
Typical Application (adjustable)
Fig. 1
Fig. 2
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