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PDF YX605 Data sheet ( Hoja de datos )
| Número de pieza | YX605 | |
| Descripción | LOW INPUT HIGH EFFICIENCY SYNCHRONOUS STEP-UP CONVERTER | |
| Fabricantes | Huajing Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de YX605 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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YX605
NOLSUOYSWNCISHNRPTOUETNPOH-UIGUSHPSETFCEFPOIC-UINEPNVCCOEYNRVTERETRER
V1.0
SYNCHROLOW INPUT HIGH EFFICIENCY
FEATURES
GENERAL DESCRIPTION
Up to 0.9V Startup Voltage
Up to 94% Efficiency
Internal Power Switch
3.3V and 5V Fixed or Adjustable Output
Voltage
Zero Supply Current Shutdown Mode
Tiny SOT 23-5 Package
APPLICATIONS
Hand-Held Devices
One to Three Cell Battery Operated Devices
PDAs
Cellular Phones
Digital Cameras
GPS
The YX6 0 5 Low Input High Efficiency
Synchronous Step-Up Converter is capable of
delivering more than 400mA output current using
only three external components.
Typical startup voltage is 0.95V and the
device can operate down to a 0.6V input voltage.
Incorporating an internal synchronous rectifier,
the YX6 0 5 can achieve high efficiency of up to
94%. Variable switching frequency operation
results in high efficiency for a wide range of
loads.
The output voltage is selectable between
3.3V and 5V, or can be externally set to any
voltage between 2V and 5V. The YX6 0 5 is
available in the tiny SOT23-5 Package.
Figure 1. Typical Application Circuit
. -1-
MAR 2013
1 page  
FB = OUT
FB = G
FB connected to resistive
divider
VOUT = 3.3V
VOUT = 5V
VOUT = 1.18V (1+R1/R2)
Figure 3.
OUTPUT CAPACITOR SELECTION
The output capacitor value should be in the
range of 22µF to 100µ. A minimum value of
capacitance is required to maintain loop stability
and normal operation of the IC. To obtain small
output ripple, use a large capacitor with low
ESR. Ceramic capacitors should be used for
highest performance. If a tantalum capacitor is
used, choose only low ESR types. For a non-
YX605
NOLSUOYSWNCISHNRPTOUETNPOH-UIGUSHPSETFCEFPOIC-UINEPNVCCOEYNRVTERETRER
V1.0
ceramic capacitors a smaller low ESR capacitor
of about 1µF can be used in parallel to filter high
frequency noise.
INDUCTOR SELECTION
The inductor value determines its ripple
current. For most applications with this device,
the inductor value should be in the range of
10µH to 47µH. Smaller inductors provide faster
load transient response while having a smaller
physical size. But they also generate higher
ripple current, which reduces the maximum
output current available to the load. Inductors
with low series resistance are recommended to
obtain highest efficiency.
BOARD LAYOUT
To reduce noise and increase efficiency, the
traces for high current paths should be large and
an extended ground plane used.
In order to reduce electromagnetic radiation,
the switching current paths should be as short as
possible. In other words, the input and output
capacitors should be very close to the IC.
If the external resistor divider is used, it
should be very close to the FB and G pins and
the high switching current paths.
. -5-
MAR 2013
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet YX605.PDF ] | |
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