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PDF HX1001 Data sheet ( Hoja de datos )
| Número de pieza | HX1001 | |
| Descripción | Synchronous Buck DC/DC Converter | |
| Fabricantes | Hexin Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HX1001 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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HX1001
Synchronous Buck DC/DC Converter HX1001
Features
Up to 95% Efficiency
Current mode operation for excellent line
and load transient response
Low quiescent current: 230µA
Low Switch on Resistance RDS(ON),
Internal Switch: 0.35Ω
： ～Output voltage 5.5V 0.6V
Automatic PWM/PFM mode switching
No Schottky diode required
1.4MHz fixed frequency switching
Short-Circuit protection
Shutdown quiescent current: < 1µA
Low profile SOT-23-5 package (lead-free
packaging is now available)
Application
Digital cameras and MP3
Palmtop computers / PDAs
Cellular phones
Wireless handsets and DSL modems
PC cards
Portable media players
Description
The HX1001 is high efficiency
synchronous, PWM step-down DC/DC
converters working under an input voltage
range of 2.5V to 5.5V. This feature makes the
HX1001 suitable for single Li-lon
battery-powered applications. 100% duty
cycle capability extends battery life in
portable devices, while the quiescent current
is 200µA with no load, and drops to < 1µA in
shutdown.
The internal synchronous switch is
desired to increase efficiency without an
external Schottky diode. The 1.4 MHz fixed
switching frequency allows the using of tiny,
low profile inductors and ceramic capacitors,
which minimized overall solution footprint.
The HX1001 converters are available in
the industry standard SOT-23-5 power
packages (or upon request).
Order Information
① ②HX1001 -
:
SYMBOL
①
②
DESCRIPTION
Denotes Output voltage:
K:1.2V Output B : 1.5V Output; C : 1.8V Output;G:3.3V
Output A : Adjustable Output
Denotes Package Types:
E: SOT-23-5
Wuxi Hexin Semiconductor Ltd., Co
-1-
深圳市道正工贸有限公司 www.rightwaychina.com
1 page  
Typical Performance Characteristis
VOUT=1.8V
CONVERSION EFFICIENCY
100
90
EFFICIENCY(%)
80
70
60
50
40
30
20
10
0
1
10 100
OUTPUT CURRENT
1000
VIN=2.7V
VIN=3.6V
VIN=4.2V
HX1001
VOUT=2.5V
100
90
80
EFFICIENCY
70
60
50
40
30
20
10
0
1
CONVERSION EFFICIENCY
10 100
OUTPUT CURRENT
1000
VIN=2.7V
VIN=3.6V
VIN=4.2V
Output Noise
10mV/DIV
AC COUPLED
VIN=3.6V
VOUT=1.8V
ILOAD=0mA
2ms/DIV
Output Noise
10mV/DIV
AC COUPLED
VIN=3.6V
VOUT=1.8V
ILOAD=200mA
200ns/DIV
Wuxi Hexin Semiconductor Ltd., Co
-5-
深圳市道正工贸有限公司 www.rightwaychina.com
5 Page 
OUTPUT AND INPUT CAPACITOR SELECTION
HX1001
In continuous mode, the source current of the top MOSFET is a square wave of duty cycle
VOUT/VIN. To prevent large voltage transients, a low ESR input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor current is given by:
This formula has a maximum at VIN = 2VOUT, where IRMS = IOUT/2. This simple worst-case condition
is commonly used for design because even significant deviations do not offer much relief. Note
that the capacitor manufacturer’s ripple current ratings are often based on 2000 hours of life.
This makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher
temperature than required. Always consult the manufacturer if there is any question.
The selection of COUT is driven by the required effective series resistance (ESR).
Typically, once the ESR requirement for COUT has been met, the RMS current rating generally far
∆exceeds the IRIPPLE(P-P) requirement. The output ripple VOUT is determined by:
where f = operating frequency, COUT = output capacitance and ∆IL = ripple current in the inductor.
For a fixed output voltage, the output ripple is highest at maximum input voltage since ∆IL
increases with input voltage.
Aluminum electrolytic and dry tantalum capacitors are both available in surface mount
configurations. In the case of tantalum, it is critical that the capacitors are surge tested for use in
switching power supplies. An excellent choice is the AVX TPS series of surface mount tantalum.
These are specially constructed and tested for low ESR so they give the lowest ESR for a given
volume. Other capacitor types include Sanyo POSCAP, Kemet T510 and T495 series, and
Sprague 593D and 595D series. Consult the manufacturer for other specific recommendations.
Wuxi Hexin Semiconductor Ltd., Co
-11-
深圳市道正工贸有限公司 www.rightwaychina.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HX1001.PDF ] | |
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