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PDF LX1918 Data sheet ( Hoja de datos )
| Número de pieza | LX1918 | |
| Descripción | 1.8A Step-Down Synchronous Converter | |
| Fabricantes | Microsemi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LX1918 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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LX1918
www.DataSheet4U.com
TM ® 1.8A Step-Down Synchronous Converter
PRODUCTION DATA SHEET
DESCRIPTION
The Microsemi LX1918 is a step The LX1918 MODE feature can
down buck regulator with a either maximize efficiency or reduce
synchronous rectifier. All MOSFET EMI depending on the needs of the
switches and compensation com- application. High efficiency (MODE =
ponents are built in. The synchronous GND) is obtained by allowing the
rectification eliminates the need of an LX1918 to enter a PFM mode with
external Schottky diode and discontinuous inductor current. Low
maximizes efficiency (>95%) for a EMI (MODE=VCC) is obtained by
high step-down ratio and a low output only operating in PWM mode even at
voltage. The input supply voltage no load.
range is from 2.7V to 5.5V with a The LX1918 features include soft
maximum output current of 1.8A.
start, cycle-by-cycle switch current
The LX1918 is a current mode limit, hiccup short circuit current
PWM with optional PFM under light limiting and thermal shut down.
loads. The LX1918 can switch with a The LX1918 comes in small 8 pin
1MHz free running internal oscillator MLP package (fully RoHS compliant).
or be synchronized with an external
oscillator ranging from 500KHz to
1.25MHz; the high frequency allows
for small size and low cost external
components. The LX1918 output
voltage is programmable with two
resistors and can be tightly regulated
down to 0.6V.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
VIN
KEY FEATURES
Input range voltage 2.7 to 5.5V
Maximum output current, 1.8A
Internal or External
Synchronization
Output Voltage from VIN to 0.6V
PFM or PWM mode under light
load
EMI support with force PWM
mode
Efficiency up to 95%
No external Schottky diode
Thermal shutdown
Cycle by cycle switch current
limit
UVLO
Short circuit protection
8 pin MLP
APPLICATIONS
Lower power embedded
applications
WLAN power system
Portable design with single cell
Lion or 3 cells NiMH/NiCd
Low power portable storage
application
ON OFF
VCC PWR SW
MODE
LX1918
E/SPGND SGND FB
VOUT @ 1.8 A
Copyright © 2004
Rev. 1.1, 2005-07-05
PACKAGE ORDER INFO
TA (°C)
-40 to 85
Plastic MLP
LD 8-Pin 3x3mm
RoHS Compliant / Pb-free
LX1918CLD
Note: Available in Tape & Reel. Append the letters
“TR” to the part number.(i.e. LX1918CLD-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
LX1918
www.DataSheet4U.com
TM ® 1.8A Step-Down Synchronous Converter
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
VIN = 2.7 to 5.5V
0.1µF
4.7µF
40.2
ON OFF
LX1918
PWR
SW
VCC
E/SLX1918FB
MODE
PGND SGND
L1
3.3µH
20K R1
10K R2
1.8V @ 1.5A
47µF
Figure 2 – Typical Application: Highest Light Load Efficiency Mode During Light Load With Internal 1MHz PWM Frequency
VIN = 2.7 to 5.5V
0.1µF
4.7µF
40.2
LX1918
PWR
SW
VCC
E/SLX1918FB
MODE
PGND SGND
500kHz
L1
3.3µH
15k R1
10k R2
1.5V @ 1.5A
47µF
Figure 3 – Typical Application: PWM Low EMI Mode Operation During Light Load With External 500kHz Synchronization
Copyright © 2004
Rev. 1.1, 2005-07-05
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LX1918.PDF ] | |
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