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PDF XR1151 Data sheet ( Hoja de datos )
| Número de pieza | XR1151 | |
| Descripción | 1.2MHZ Step-up DC/DC Converter | |
| Fabricantes | XySemi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XR1151 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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XR1151
___________________________________________________________________________________________________
1.2MHZ Step-up DC/DC Converter in SOT23-6
GENERAL DESCRIPTION
The XR1151 step-up switching regulator
generates an output voltage of up to 6V
from an input voltage as low as 1.6V. Ideal
for applications where space is limited, it
switches at 1.2MHz, allowing the use of
tiny, low cost and low profile external
components. Its internal 2A, 100mΩ
NMOS switch provides high efficiency even
at heavy load, while the constant frequency,
current mode architecture results in low,
predictable output noise that is easy to
filter. Internal frequency compensation is
designed to accommodate ceramic output
capacitors, further reducing noise. The
device features very low shutdown current
of 0.5uA.
The XR1151 is available in the 6-lead
SOT-23 package.
FEATURES
• Internal 2A MOSFET Switch
• 1.2MHZ Switching Frequency
• Integrated Soft-Start
• Low 1.6V Vin Operation
• Low Rds(on) Switch :100mΩ at 5V Output
• Delivers 5V at 800mA from a 3.3V input
• Delivers 3V at 800mA from a 2.5V input
• Uses Small.Low Profile External Components
• Low profile(1mm):SOT-23(Thin SOT)package
APPLICATIONS
• White LED Driver Supply
• Local 3.3V or 5V supply
• Battery Back-up
XySemi Inc
Figure 1. Typical Application Circuit
- 1 - www.xysemi.com
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1 page  
XR1151
______________________________________ _________________________________________________________
most XR1151 applications.
GND.
The inductor should have low DCR (DC
resistance) to reduce the I2R power losses, and
Recommended: Murata GRM32ER61A106KA01L
must be able to handle the peak inductor current
Murata GRM32NR61A226KE19L
without saturating.
Several inductor manufacturers are listed in Table 1
Selected inductor by actual application:
Manuf
acture
r
Part Inducta
Numb nce(uH)
er
DRC
max
(Ohm
s)
Dimension
s
L*W*H(mm
3)
Murata LQH5B
PN
2.2
5*5*2
0.03
LQH32
PN
1.0
3.2*2.5*1.7
0.045
2.2 0.06
Sumid CDRH 2.2 0.03 4*4*1.8
a
3D16
4.7
0.07
Table 1. Recommend Surface Mount Inductors
OUTPUT CAPACITOR SELECTION
A low ESR output capacitor is required in order
to maintain low output voltage ripple. In the case of
ceramic output capacitors, capacitor ESR is very
small and does not contribute to the ripple, so a
lower capacitance value is acceptable when
ceramic capacitors are used. A 22uF ceramic output
capacitor is suitable for most applications.
Recommended: Murata GRM32NR61A226KE19L
OUTPUT VOLTAGE PROGRAMMING
In the adjustable version, the output voltage is
set by a resistive divider according to the following
equation:
R2
=
R1
×
⎛
⎜⎝
VOUT
0.6
− 1⎞⎟⎠
Diode Selection
A Schottky diode is recommended for use with the
XR1151.Use of a low forward voltage diode such as
the ON Semiconductor MBRA210LT3 is
recommended. A Schottky diode rated at 2A is
recommended for use with the XR1151.
INPUT CAPACITOR SELECTION
The input capacitor reduces input voltage ripple
to the converter, low ESR ceramic capacitor is
highly recommended. For most applications, a
10~22uF capacitor is used. The input capacitor
should be placed as close as possible to VIN and
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.
PCB Layout Guidelines
The high speed operation of the XR1151 demands
careful attention to board layout. You will not get
advertised performance with careless layout. Figure
as below shows the recommended component
placement. A large ground pin copper area will help
to lower the chip temperature.
XySemi Inc
- 5 - www.xysemi.com
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| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet XR1151.PDF ] | |
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