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PDF EML3418 Data sheet ( Hoja de datos )
| Número de pieza | EML3418 | |
| Descripción | Synchronous Step-Down Regulator | |
| Fabricantes | Elite Semiconductor | |
| Logotipo |  |
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ESMT/EMP
EML3418
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
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
capability. High 1.3MHz internal frequency
makes small surface mount inductors and
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.
EML3418 is designed base on pulse width
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
regulated output down to 0.6V.
The device is available in an adjustable version
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 240μA with No
Switching
Internal switching frequency 1.3MHz
No Schottky Diode needed
Low Dropout Operation: 100% Duty Cycle
Shutdown current < 1μA
Excellent Line and Load Transient
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
Elite Semiconductor Memory Technology Inc./Elite Micropower Inc.
Publication Date: Jan. 2011
Revision: 2.3
1/17
1 page  
ESMT/EMP
EML3418
Note 1: TJ is a function of the ambient temperature TA and power dissipation PD ( TJ = TA +
(PD)(55°C/W) )
Note 2: Dynamic quiescent current is higher due to the gate charge being delivered at the
switching frequency.
Note 3: This IC is build-in over-temperature protection to avoid damage from overload conditions.
Elite Semiconductor Memory Technology Inc./Elite Micropower Inc.
Publication Date: Jan. 2011
Revision: 2.3
5/17
5 Page 
ESMT/EMP
EML3418
feedback resistors. Resistive divider R1/R2 must
be connected and parallel to the output
capacitor COUT.
3. The Input capacitor CIN must be connected
to pin VIN as closely as possible.
4. Keep SW node away from the sensitive VFB
node since this node is with high frequency and
voltage swing.
5. Keep the (–) plates of CIN and COUT as close
as possible.
6. Connect all analog grounds to a common
node and connect the common node to
power ground through an independent path.
Self-Enable Application
A self-enable function could be used when
EML3418 is connected as the following
diagram:
output voltage ripple versus input voltage when
output voltage is 3.3V and EML3418 provides
200mA load current.
VOUT Ripple When VIN Closes To VOUT
The resistor ratio R3:R4=1:1.5 is recommended.
Output Voltage Ripple When VIN Closes To VOUT
EML3418 goes into LDO mode when input
voltage closes to output voltage. The transition
from PWM mode to LDO mode is smooth.
Bottom diagram shows the relationship of
Recommended Components
Supplier
Coilcraft
Inductance
(uH)
1.5
Isat (A)
14
DCRmax (mΩ) Dimensions
(mm)
Part Number
13 12.3 x 12.3 x 6 MSS1260-152NLB
Supplier
YAGEO
TAIYO YUDEN
Capacitance (uF)
4.7
22
Package
0805
1812
Part Number
CC0805KKX5R6BB475
EMK432BJ226KM-T
Elite Semiconductor Memory Technology Inc./Elite Micropower Inc.
Publication Date: Jan. 2011
Revision: 2.3
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet EML3418.PDF ] | |
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