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PDF A7531 Data sheet ( Hoja de datos )
| Número de pieza | A7531 | |
| Descripción | 350KHz PFM STEP-UP DC-DC CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A7531 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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AiT Semiconductor Inc.
www.ait-ic.com
A7531
DC-DC CONVERTER/ BUCK (STEP-DOWN)
HIGH EFFICIENCY, MULTI-FUNCTION
DESCRIPTION
FEATURES
A7531 series are CMOS-based PFM step-up DC-DC Deliver 500mA at 4.0V Output voltage with 2V
Controller with low supply current and high output
voltage accuracy. Quiescent current drawn from
power source is as low as 6uA. It is capable of
delivering 500mA output current at 4.0V output with
2V input Voltage. Only four external components are
necessary: An inductor, a Schottky diode, an output
filter capacitor and a NMOSFET or a NPN transistor
All of these features make A7531 series be suitable
input Voltage
The controller output voltage can be adjusted from
2.5V～6.0V(In 0.1V step)
Output voltage accuracy ±2%
Low temperature-drift coefficient of the output
voltage ±100ppm/°C
Only four external components are necessary: An
for the portable devices, which are supplied by a
inductor, a Schottky diode, an output filter
single battery to four-cell batteries.
A7531 has a drive pin (EXT) for external transistor.
So it is possible to load a large output current with a
power transistor which has a low voltage dropout.
A7531 integrates stable reference circuits and
trimming technology, so it can afford high precision
capacitor and a NMOSFET or a NPN transistor
High power conversion efficiency 90％
Low quiescent current drawn from power source
6uA
Available in SOT-25 Package
and low temperature-drift coefficient of the output APPLICATION
voltage.
A7531 can be switch on or off easily by CE pin, to Power source for PDA, DSC, MP3 Player,
minimize the standby supply curren.
electronic toy and wireless mouse
The A7531 is available in SOT-25 package.
Power source for a single or dual-cell
battery-powered equipments
ORDERING INFORMATION
Power source for LED
Package Type
Part Number
SOT-25
A7531E5R-XXY
E5
A7531E5VR-XXY
Note
XX: Output Voltage
Y: Function Type
2 : With Enable Circuit
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix “ V “ means Halogen free Package
TYPICAL APPLICATION
REV2.0
- MAR 2007 RELEASED, AUG 2013 UPDATED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7531
DC-DC CONVERTER/ BUCK (STEP-DOWN)
HIGH EFFICIENCY, MULTI-FUNCTION
TYPICAL PERFORMANCE CHARACTERISTICS
Recommended operating conditions: L=10uH, CIN=47uF, COUT=100uF, Cp=1nF Topt=25°C.
unless otherwise noted
1. Output Voltage vs. Output Current
2. Output Voltage vs. Output Current
3. Efficiency vs. Output Current
4. Efficiency vs. Output Current
5. Ripple vs. Output Current
6. Ripple vs. Output Current
REV2.0
- MAR 2007 RELEASED, AUG 2013 UPDATED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
EXTEND APPLICATIONS
Figure 7. 12V STEP-UP APPLICATION
A7531
DC-DC CONVERTER/ BUCK (STEP-DOWN)
HIGH EFFICIENCY, MULTI-FUNCTION
Note: A7531’s output voltage is 6V. When the output current is small or no load, the output voltage will be
unstable, use the RZD for flowing the bias current through the zener diode. For step-up application, a
diode(for example: 1N4148) is needed as starter circuit.
Figure 8. STEP-DOWN APPLICATION
Note: In step-down application, use starter circuit as above. 2.5V≤Vzener≤VOUT. RST is needed for bias
current of zener diode. This starter circuit also can be used in high voltage step-up application.
REV2.0
- MAR 2007 RELEASED, AUG 2013 UPDATED -
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A7531.PDF ] | |
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