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PDF XF45061 Data sheet ( Hoja de datos )
| Número de pieza | XF45061 | |
| Descripción | 600mA 4MHz Synchronous Step-Down DC/DC Converter | |
| Fabricantes | XySemi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XF45061 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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XF45061
____________________________________________________________________________________________________________________________
600mA 4MHz Synchronous Step-Down DC/DC Converter
GENERAL DESCRIPTION
The XF45061 is a current mode
synchronous step-down converter with
fixed operating frequency. The supply
current is only 130uA at operating and less
than 1uA at shutdown. This device is the
ideally solution for Li-Ion battery powered
system applications and small size board
applications.
This device has internal switch, no
external diode. It has internal fixed 4MHz
frequency and makes application circuit
smaller.
The XF45061 is available in an adjustable
output voltage version. The adjustable
version has wide output range from 0.6V to
VIN. The XF45061 is available in a low
profile (1mm) tiny SOT23-5 package.
FEATURES
• 600mA Output Current
• High Efficiency up to 92%
• 2.5V to 5.5 V Input Range
• Adjustable Output Voltage from 0.6V to
VIN
• Low Quiescent Current 130uA
• No Schottky Diode Required
• 4MHz Constant Frequency Operation
• Low Dropout Operation: 100% Duty
Cycle
• Current Mode Operation for Excellent
Line and Load Transient Response
• Operating Temperature: -40oC to +85°C
• Available in tiny SOT23-5 Package
APPLICATIONS
• Cell Phones，Smart Phones
• 3G RF PA
• WLAN，GPS and Bluetooth Applications
• DTV Tuner Applications
• Note Books,Ultra-Mobile PCs
XySemi Inc
Figure 1. Typical Application Circuit
- 1 - www.xysemi.com
Rev0.1
1 page  
XF45061
____________________________________________________________________________________________________________________________
Manuf Part Induct DRC Dimensions
be placed as close as possible to VIN and GND.
acture Number ance(u max L*W*H(mm3)
r H) (Ohms
OUTPUT CAPACITOR SELECTION
) A low ESR output capacitor is required in order
Murata LQH32PN 1
0.06 3.2*2.5*1.7
to maintain low output voltage ripple. In the case of
ceramic output capacitors, capacitor ESR is very
2.2 0.09
small and does not contribute to the ripple, so a
4.7 0.15
lower capacitance value is acceptable when
ceramic capacitors are used. A 10uF ceramic output
Sumid CDRH3D
a 16
1.5
2.2
0.04
0.07
4*4*1.8
capacitor is suitable for most applications.
OUTPUT VOLTAGE PROGRAMMING
3.3 0.11
In the adjustable version, the output voltage is
set by a resistive divider according to the following
4.7 0.16
equation:
Table 1. Recommend Surface Mount Inductors
INPUT CAPACITOR SELECTION
The input capacitor reduces input voltage ripple
to the converter, low ESR ceramic capacitor is
highly recommended. For most applications, a
4.7uF capacitor is used. The input capacitor should
R2
=
R1
×
⎛
⎜⎝
VOUT
0.6
− 1⎞⎟⎠
Typically choose R1=100K and determine R2 from
the following equation:
Connect a small capacitor across R1 feed forward
capacitance at the FB pin for better performance.
Figure 4. Typical Application Circuit for Adjustable Version
XySemi Inc
- 5 - www.xysemi.com
Rev0.1
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet XF45061.PDF ] | |
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